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Schweitzer Engineering Laboratories SEL-751 Instruction Manual

Schweitzer Engineering Laboratories SEL-751 Instruction Manual

Feeder protection relay

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SEL-751 Relay

Feeder Protection Relay

Instruction Manual

20170927

*PM751-01-NB*

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Summary of Contents for Schweitzer Engineering Laboratories SEL-751

Page 1 SEL-751 Relay Feeder Protection Relay Instruction Manual 20170927 *PM751-01-NB*...
Page 2 SEL products appearing in this document may be covered by U.S. and Foreign patents. Schweitzer Engineering Laboratories, Inc. reserves all rights and benefits afforded under federal and international copyright and patent laws in its products, including without limitation software, firmware, and documentation.
Page 3: Table Of Contents
Report Settings (SET R Command) ......................4.205 DNP Map Settings (Set DNP n Command, n = 1, 2, or 3) ................4.208 Modbus Map Settings (SET M Command)....................4.209 Touchscreen Settings ........................... 4.209 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 4 View/Change Settings With the Two-Line Front Panel ....................6.2 View/Change Settings With the Touchscreen Front Panel....................6.4 View/Change Settings Over Communications Port..................6.4 Setting Entry Error Messages.......................... 6.6 SEL-751 Settings Sheets Section 7: Communications Overview ................................. 7.1 Communications Interfaces ..........................7.1 Communications Protocols..........................7.11 Section 8: Front-Panel Operations Overview .................................
Page 5 ACSI Conformance Statements........................F.48 Appendix G: IEC 60870-5-103 Communications Overview ................................ G.1 Introduction to IEC 60870-5-103 ........................G.1 IEC 60870-5-103 in the SEL-751........................G.9 IEC 60870-5-103 Documentation ........................ G.12 Appendix H: DeviceNet Communications Overview ................................ H.1 DeviceNet Card .............................. H.1 Features................................
Page 6 Overview ................................ K.1 Definitions ..............................K.6 Appendix L: Analog Quantities Appendix M: Cybersecurity Features Access Control..............................M.1 Configuration Management..........................M.2 Malware Protection ............................M.3 Security Vulnerabilities ..........................M.3 Settings Erasure ..............................M.3 Glossary Index SEL-751 Relay Command Summary SEL-751 Relay Instruction Manual Date Code 20170927...
Page 7 List of Tables R.Instruction Manual Table 1.1 Phase and Neutral Current Ratings Selection for the SEL-751 Models ........ 1.2 Table 1.2 Current (ACI) and Voltage (AVI) Card Selection for SEL-751 Models ........ 1.2 Table 1.3 SEL-751 Protection Elements ....................1.2 Table 1.4...
Page 8 Analog Input Card Settings in Slot 3 ................. 4.183 Table 4.78 Analog Output Card Settings in Slot 3................4.184 Table 4.79 Slot C Input Debounce Settings ..................4.187 Table 4.80 Data Reset Settings......................4.187 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 9 Range Dependencies for 59I Operating Quantities ............SET.14 Table SET.5 Port Number Settings That Must be Unique ..............SET.51 Table 7.1 SEL-751 Communications Port Interfaces................7.1 Table 7.2 PRP Settings........................... 7.6 Table 7.3 EIA-232/EIA-485 Serial Port Pin Functions ................. 7.8 Table 7.4...
Page 10 Front-Panel Automatic Messages (FP_AUTO := OVERRIDE) ..........8.3 Table 8.2 Front-Panel Pushbutton Functions ..................8.5 Table 8.3 Possible Warning Conditions (Flashing TRIP LED) ............8.14 Table 8.4 SEL-751 Front-Panel Operator Control Functions .............. 8.16 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 11 SEL Display Package Compatibility With Relay Firmware ..........A.7 Table A.5 DeviceNet Card Versions ...................... A.8 Table A.6 EDS File Compatibility......................A.8 Table A.7 SEL-751 ICD File Revision History ..................A.9 Table A.8 Instruction Manual Revision History .................. A.13 Table C.1 Supported Serial Command Sets....................C.1 Table C.2 Compressed ASCII Commands .....................C.2...
Page 12 Table D.10 DNP3 Reference Data Map....................D.19 Table D.11 DNP3 Default Data Map ..................... D.20 Table D.12 SEL-751 Object 12 Control Operations ................D.23 Table D.13 Sample Custom DNP3 AI Map ................... D.27 Table E.1 Modbus Query Fields ......................E.2 Table E.2 SEL-751 Modbus Function Codes ..................E.2...
Page 13 SEL-751 IEC 60870-5-103 Port Settings................G.9 Table G.11 SEL-751 Analog Fault Quantities ..................G.10 Table I.1 PMU Settings in the SEL-751 for C37.118 Protocol in Global Settings ........I.4 Table I.2 Synchrophasor Order in Data Stream (Voltages and Currents)..........I.6 Table I.3 User-Defined Analog Values Selected by the NUMANA Setting ..........I.7...
Page 14 Table J.5 Protocol Settings ..................J.5 IRRORED Table K.1 Relay Word Bits ....................K.1 OGIC Table K.2 Relay Word Bit Definitions for the SEL-751 Relay.............. K.6 Table L.1 Analog Quantities........................L.1 Table M.1 IP Port Numbers ........................M.1 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 15 List of Figures R.Instruction Manual Figure 1.1 SEL-751 Feeder Protection Relay Applied Throughout the Power System ......1.8 Figure 1.2 Typical Current Connections....................1.9 Figure 1.3 Response Header ........................1.10 Figure 1.4 STA Command Response—No Communications Card or EIA-232/EIA-485 Communications Card ...................... 1.11 Figure 1.5...
Page 16 SEL-751 Provides Overcurrent Protection for an Ungrounded System (Open-Delta Connected PTs, Broken-Delta 3V0 Connection)......... 2.41 Figure 2.33 SEL-751 With a 2 AVI/4 AFDI Option Card and the Fiber-Optic-Based Point-Sensor..2.42 Figure 2.34 Black-Jacketed Fiber installation Example ................2.43 Figure 2.35 Point-Sensor Assembly ......................
Page 17 Figure 4.49 Decreasing Neutral Resistance R Results in Increasing Zero-Sequence Current I 0(1) (Seen by Relay 1) ......................4.67 Figure 4.50 Zero-Sequence Impedance Plots for Ground Fault on Low-Impedance Grounded Distribution System ..................4.68 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 18 Reclose Supervision Logic (Following Open Interval Time-Out) ........4.132 Figure 4.82 Reclose Supervision Limit Timer Operation..............4.133 Figure 4.83 SEL-751 Relays Installed at Both Ends of a Transmission Line in a High-Speed Reclose Scheme..................4.136 Figure 4.84 Reclosing Relay States and General Operation..............4.138 Figure 4.85...
Page 19 Figure 5.19 Plotted Breaker Maintenance Points for a 25 kV Circuit Breaker ........5.21 Figure 5.20 SEL-751 Breaker Maintenance Curve for a 25 kV Circuit Breaker ........5.22 Figure 5.21 Operation of SEL Control Equation Breaker Monitor Initiation Setting ..... 5.23 OGIC Figure 5.22...
Page 20 IRIG-B Input Via Fiber-Optic EIA-232 Port 2 (SEL-2401/2404/2407 Time Source)... 7.8 Figure 7.9 EIA-232 DB-9 Connector Pin Numbers ................7.8 Figure 7.10 SEL Cable C234A—SEL-751 to DTE Device..............7.9 Figure 7.11 SEL Cable C227A—SEL-751 to DTE Device..............7.9 Figure 7.12 SEL Cable C222—SEL-751 to Modem ................
Page 21 Device Part Number Touchscreen Configuration Option............. 9.14 Figure 9.12 QuickSet Bay Control Project Management and Project Preview Display......9.14 Figure 9.13 Open Single-Line Diagram in Bay Screen Builder.............. 9.15 Figure 9.14 Drag-and-Drop Symbols ...................... 9.15 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 22 Sample Custom DNP3 BO Map Settings................D.30 Figure D.11 Binary Output Map Entry in QuickSet Software........D.30 ERATOR Figure F.1 SEL-751 Datasets........................F.6 Figure F.2 SEL-751 Predefined Reports....................F.7 Figure F.3 GOOSE Quality........................F.10 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 23 Waveform at Relay Terminals May Have a Phase Shift............I.3 Figure I.3 Correction of Measured Phase Angle..................I.3 Figure I.4 TCP Connection ........................I.10 Figure I.5 UDP_T and UDP_U Connections..................I.10 Figure I.6 UDP_S Connection .......................I.11 Figure I.7 Sample MET PM Command Response.................I.14 Date Code 20170927 Instruction Manual SEL-751 Relay...
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Page 25: Overview
800 x 480 pixels). Section 9: Bay Control. Describes how to configure and design the bay control screens for SEL-751 relays with the touchscreen display (5- inch, color, 800 x 480 pixels). Section 10: Analyzing Events. Describes event type, messages, event summary data, standard event reports, and Sequential Events Recorder (SER) report.
Page 26: Communications Protocol
Describes the procedure to update the firmware stored in flash memory. Appendix C: SEL Communications Processors. Provides examples of how to use the SEL-751 with SEL communications processors for total substation automation solutions. Appendix D: DNP3 Communications. Describes the DNP3 protocol support provided by the SEL-751.
Page 27 Se reporter à la documentation. Earth (ground) Terre Protective earth (ground) Terre de protection Direct current Courant continu Alternating current Courant alternatif Both direct and alternating current Courant continu et alternatif Instruction manual Manuel d’instructions Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 28 (–40°F à +185°F). Hazardous Locations Approvals The SEL-751 is UL certified for hazardous locations to Canadian and U.S. standards. In North America, the relay is approved for Hazardous Locations Class I, Division 2, Groups A, B, C, and D, and temperature class T4A in the maximum surrounding air temperature of 50°C.
Page 29 Preface xxvii Safety Information (Two-Line Display) (Touchscreen Display) Product Compliance Labels for the SEL-751 With Two-Line Display and With the Touchscreen Display Other Safety Marks (Sheet 1 of 2) DANGER DANGER Disconnect or de-energize all external connections before opening this Débrancher tous les raccordements externes avant d’ouvrir cet...
Page 30: Settings
Des can result otherwise. dommages à l’équipement pourraient survenir autrement. General Information Typographic There are many ways to communicate with the SEL-751. The three primary methods are: Conventions ➤ Using a command line interface on a PC terminal emulation window.
Page 31 Examples This instruction manual uses several example illustrations and instructions to explain how to effectively operate the SEL-751. These examples are for demonstration purposes only; the firmware identification information or settings values included in these examples may not necessarily match those in the present version of your SEL-751.
Page 32 The labels are located on the left side panel of the product. The labels show the serial number, model number, and the ratings of the product. (High-Voltage Supply) (Low-Voltage Supply) Product Labels for the SEL-751 With the Two-Line Display SEL-751 Relay Instruction Manual Date Code 20170927...
Page 33 (Low-Voltage Supply) Product Labels for the SEL-751 With the Touchscreen Display LED Emitter The following table shows LED information specific to the SEL-751 (see Figure 2.9 for the location of the ports using these LEDs on the relay). SEL-751 LED Information...
Page 34 Preface Safety Information The following figure shows the LED location specific to the SEL-751 (see Figure 2.9 for the complete rear-panel drawing). Fiber-Optic Ethernet Fiber-Optic Port LEDs Serial Port LED Arc-Flash Detection LEDs for Self-Test i5364a SEL-751 LED Locations LED Safety Warnings and Precautions ➤...
Page 35 Instructions for Use a mild soap or detergent solution and a damp cloth to carefully clean the SEL-751 chassis when necessary. Clean the touchscreen display gently with a Cleaning and moist cotton cloth. Avoid using abrasive materials, polishing compounds, and...
Page 36 USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Technical Assistance Obtain technical assistance from the following address: Schweitzer Engineering Laboratories, Inc. WARNING 2350 NE Hopkins Court Pullman, WA 99163-5603 U.S.A. Use of this equipment in a manner other than specified in this manual Tel: +1.509.338.3838...
Page 37: Overview
Table 1.1 shows the phase and neutral current ratings choices for the different SEL-751 MOT choices. Phase current inputs are 1 A or 5 A nominal rating and neutral current inputs are 1 A, 5 A, or 200 mA nominal rating.
Page 38: Table 1.2 Current (Aci) And Voltage (Avi) Card Selection For Sel-751 Models
5 Amp Phase, 200 mA Neutral Table 1.2 shows current (ACI) and voltage (AVI) card selection for the SEL-751 models. Table 1.2 Current (ACI) and Voltage (AVI) Card Selection for SEL-751 Models Slot E Card Slot Z Card Option Option...
Page 39 Introduction and Specifications Features Table 1.3 SEL-751 Protection Elements (Sheet 2 of 3) Slot Z 4 ACI Card Slot Z 4 ACI/3 AVI Slot Z 4 ACI/3 AVI (Current Only Model) Protection Element Card With 1 A or 5 A...
Page 40: Table 1.4 Sel-751 Front-Panel Options
Petersen coil grounded applications. Available as ordering options. The SEL-751 offers three front-panel HMI layouts that are model and option dependent. Table 1.4 lists the HMI options for the SEL-751 front panel. Table 1.4 SEL-751 Front-Panel Options...
Page 41: Models, Options, And Accessories
Models Complete ordering information is not provided in this instruction manual. See the latest Model Option Table for the SEL-751 with the two-line display and the SEL-751 with the touchscreen display at selinc.com, under Support > Product Literature > Ordering Information (Model Option Tables). Options and accessories are as follows: ➤...
Page 42 ➢ Modbus TCP/IP ➢ DeviceNet ➢ IEC 61850 Edition 2 ➢ IEC 60870-5-103 ➢ DNP3 serial and LAN/WAN ➤ Language Options ➢ The relay supports English or Spanish language as an ordering option SEL-751 Relay Instruction Manual Date Code 20170927...
Page 43: Applications
The SEL-751 Feeder Protection Relay has many power system protection, monitoring, and control applications. Figure 1.1 shows some of the typical protection applications for the SEL-751. You can use the SEL-751 directional and nondirectional overcurrent functions to protect virtually any power system circuit or device including lines, feeders, transformers, capacitor banks, reactors, and generators.
Page 44: Figure 1.1 Sel-751 Feeder Protection Relay Applied Throughout The Power System
Distributed Generation Industrial Distribution SEL-751 Feeder Protection Figure 1.1 SEL-751 Feeder Protection Relay Applied Throughout the Power System Section 2: Installation includes ac and dc connection diagrams for various applications. The following is a list of other possible application scenarios: ➤...
Page 45: Figure 1.2 Typical Current Connections
Understanding basic relay operation principles and methods will help you use the SEL-751 effectively. This section presents the fundamental knowledge you need to operate the SEL-751, organized by task. These tasks help you become familiar with the relay and include the following: ➤...
Page 46: Table 1.5 Sel-751 Serial Port Settings
The SEL-751 has three EIA-232 serial communications ports. The following steps require PC terminal emulation software and an SEL Cable C234A (or Communication equivalent) to connect the SEL-751 to the PC. See Section 7: Communications for further information on serial communications connections and the necessary cable pinout.
Page 47: Figure 1.4 Sta Command Response-No Communications Card Or
1.11 Getting Started Checking Use the STA serial port command to view the SEL-751 operational status. Note that offsets are shown only when the relay is online and tracking Relay Status frequency. If the DC offset exceeds a warning threshold, the analog value has a “w”...
Page 48: Definitions
DAT (Date Command) Viewing the Date Type DAT <Enter> at the prompt to view the date stored in the SEL-751. If the date stored in the relay is July 29, 2010, and the DATE_F setting is MDY, the relay replies:...
Page 49: Specifications
3.15 A Burden (per phase): <0.01 VA @ 0.2 A Maximum Rated Voltage: 300 Vdc, 250 Vac Measurement Category: Breaking Capacity: 1500 A at 250 Vac Type: Time-lag T Fuses are not serviceable. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 50 4000 V Voltage Protection Across 270 Vac, 40 J Open Contacts: Fast Hybrid (High-Speed, High-Current Interrupting) DC Output Ratings Rated Operational Voltage: 250 Vdc Rated Voltage Range: 19.2–275 Vdc Rated Insulation Voltage: 300 Vdc SEL-751 Relay Instruction Manual Date Code 20170927...
Page 51 Loss: –0.17 dBm Communications Ports ST or V-Pin Connector Splice Standard EIA-232 (2 ports) Loss: –2.00 dB Location: Front Panel Approximate Range: As much as 35 m Rear Panel Data Speed: 300–38400 bps Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 52 IEC 61000-4-29:2000 Relay Mounting Screw (#8-32) Tightening Torque Radiated RF Immunity: IEC 61000-4-3:2010 Minimum: 1.4 Nm (12 in-lb) IEC 60255-26:2013; Section 7.2.4 10 V/m Maximum: 1.7 Nm (15 in-lb) IEEE C37.90.2-2004 35 V/m SEL-751 Relay Instruction Manual Date Code 20170927...
Page 53 Impulse Voltage Test: IEC 60255-27:2013 steps Section 10.6.4.2 ac or dc 0.1–400.0 seconds, 0.1 second steps Severity Level: 0.5 J, 5 kV (50Q) IEEE C37.90:2005 Severity Level: 0.5 J, 5 kV Pickup/Dropout Time: <1.5 cycles Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 54 Time Delay: 1–240 seconds, 1-second steps Setting Range: OFF, 2.00–300.00 V (Phase elements, positive-sequence elements, phase-to- phase elements with delta inputs or synchronism-check voltage input) OFF, 2.00–520.00 V (Phase-to-phase elements with wye inputs) SEL-751 Relay Instruction Manual Date Code 20170927...
Page 55 25 ohm max. per lead once per second. Update Rate: <3 s Noise Immunity on RTD As high as 1.4 Vac (peak) at 50 Hz or Inputs: greater frequency RTD Trip/Alarm Time Delay: Approx. 6 s Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 56 (not applicable to LEA option). The current accuracy specifications are applicable for all 1 A and 5 A options. Note: For the SEL-751 current only model, the accuracy specifications for currents are only applicable when the applied signal frequency equals FNOM.
Page 57: Overview
SEL-751. Physical Location You can mount the SEL-751 in a sheltered indoor environment (a building or an enclosed cabinet) that does not exceed the temperature and humidity rat- ings for the relay. The relay is IEC EN61010-1 rated at Installation/ Overvolt- age Category II and Pollution Degree 2.
Page 58: Figure 2.1 Relay Panel-Mount Dimensions
Your SEL-751 offers flexibility in tailoring I/O to your specific application. In total, the SEL-751 has six rear-panel slots, labeled as Slots A, B, C, D, E, and Z. Slots A, B, and Z are base unit slots, each associated with a specific function.
Page 59: Figure 2.2 Slot Allocations For Different Cards
IRIG-B via the EIA-232 port and an SEL communications processor). IRIG-B input is also supported via Port 2 (EIA-232 fiber-optic serial port). Digital or analog. Figure 2.2 Slot Allocations for Different Cards Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 60: Table 2.1 Power Supply Inputs (Psio/2 Di/3 Do) Card Terminal Designations
Select the appropriate digital input voltage option: 125 Vdc/Vac, 24 Vdc/Vac, 48 Vdc/Vac, 110 Vdc/Vac, 220 Vdc/Vac, or 250 Vdc/Vac. This card is supported in Slot A of the SEL-751. It has two digital inputs and three digital outputs (two normally open Form A contact outputs and one Form C output).
Page 61 EIA-232/EIA-485 card provides one serial port with one of the following two serial port interfaces: ➤ Port 4A, an isolated EIA-485 serial port interface ➤ Port 4C, a nonisolated EIA-232 serial port interface, supporting the +5 Vdc interface Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 62: Table 2.3 Communications Card Interfaces And Connectors
(5 A phase, 1 A neutral CTs) or …x83x…(1 A phase, 200 mA neutral CTs), or …x87x…(5 A phase, 200 mA neutral CTs). Supported in Slot Z of the SEL-751, this card has current inputs for three-phase CTs, neutral current WARNING CTs, and 300 Vac voltage inputs for three-phase (wye or delta) PTs.
Page 63: Table 2.4 Current/Voltage Inputs (4 Aci/3 Avi) Card Terminal Designations
Current Card (4 ACI) Table 2.5 Current Inputs (4 ACI) Card Terminal Designations Side-Panel Terminal Description Connections Label Number IA, A-Phase current input IB, B-Phase current input IC, C-Phase current input IN, Neutral current input Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 64: Table 2.6 Voltage/Arc-Flash Detection Inputs (2 Avi/4 Afdi) Card Terminal Designations
(VBAT), and four fiber-optic transmit and receive inputs (AF1–AF4). (2 AVI/4 AFDI) MOT…xL0x… Supported only in Slot E of the SEL-751, this card has 8 V LEA synchronism-check voltage input (VS), station dc battery monitor input (VBAT), and four fiber-optic transmit and receive inputs (AF1–AF4).
Page 65: Table 2.8 Eight Analog Inputs (8 Ai) Card Terminal Designations
13, 14 AIx03, Transducer Input x03 AI_0 1 15, 16 AIx04, Transducer Input x04 AI_02 AI_03 AI_04 x=3, 4, or 5 (e.g., AI401, AI402, etc., if the card is installed in Slot D). Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 66: Table 2.10 I/O (3 Di/4 Do/1 Ao) Card Terminal Designations
COMP/ SHLD RTD03 Comp/Shield RTD7 — • • COMP/ SHLD RTD8 • • — COMP/ SHLD • • RTD9 — COMP/ SHLD RTD10 (+) RTD 10 — RTD10 (–) COMP/ SHLD RTD10 Comp/Shield SEL-751 Relay Instruction Manual Date Code 20170927...
Page 67: Table 2.12 Four Digital Inputs, One Form B Digital Output, Two Form C Digital Outputs (4 Di/3 Do) Card Terminal Designations
INx03, drives INx03 element I N_03 15, 16 INx04, drives INx04 element I N_04 I NPUTS: x = 3, 4, or 5 (e.g., OUT401, OUT402, etc., if the card is installed in Slot D). Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 68: Table 2.14 Eight Digital Inputs (8 Di) Card Terminal Designations
4, or 5 (e.g., OUT401, OUT402, etc. if the card is installed in Slot D). The 8 DO card shown previously is all Form A contacts. Refer to the SEL-751 Model Option Table for all the variants available (8A, 8B, 4A/4B, 2A/6B, 6A/2B).
Page 69: Table 2.16 Fourteen Digital Inputs (14 Di) Card Terminal Designations
The SEL-751 offers flexibility in tailoring I/O to your specific application. The SEL-751 has six rear-panel slots, labeled as Slots A, B, C, D, E, and Z. Slots A, B, and Z are base unit slots, each associated with a specific function.
Page 70 Installation I/O Configuration Adding Cards to Slots C, D, E, and Z The SEL-751 Relay can be upgraded by adding as many as three (3) optional cards. Installation Perform the following steps to install any one of these option cards into Slots C, D, E, or Z of the base unit.
Page 71 Also, contact SEL for an updated product serial number label with the updated part number. Step 20. Reconnect all connection plugs and add any additional wiring/connectors required by the new option card. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 72 Slot A Power Supply Card If replacing a power supply card, change the part number accordingly by using the PARTNO command from the 2AC level. Install new side stickers on the side of the relay. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 73: Figure 2.3 Circuit Board Of Analog I/O Board, Showing Jumper Selection
The current analog output selection is the default setting for JMP1 through JMP4. Figure 2.6 shows JMP1 selected as a voltage analog output. JMP4 Selected as Current Output JMP1 Selected as Voltage Output Figure 2.5 Current Output Jumpers Figure 2.6 Voltage Output Jumpers Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 74: Table 2.17 Jumper Functions And Default Positions
Pins labeled A bypass the password requirement, pins labeled B enable breaker control, and pins labeled C force the relay to the SEL operating sys- tem called SEL . In the unlikely event that the SEL-751 experiences an BOOT internal failure, communication with the relay may be compromised. Forcing the relay to SEL provides you with a way to download new firmware.
Page 75: Figure 2.8 Dual Fiber Ethernet With 2 Avi/4 Afdi Voltage Option With Arc-Flash Detector Inputs, Devicenet Card, And Fast Hybrid 4 Di/4 Do Card (Relay Mot 751501Aa3Ca70850830)
Relay Connections Side-Panel and Rear- The physical layout of the connectors on the side-panel and rear-panel diagrams of seven sample configurations of the SEL-751 are shown in Panel Diagrams Figure 2.8 through Figure 2.14. (A) Side-Panel Input and Output Designations (B) Rear-Panel Layout Figure 2.8 Dual Fiber Ethernet With 2 AVI/4 AFDI Voltage Option With Arc-Flash...
Page 76: Figure 2.9 Single Copper Ethernet, Eia-485 Communication, 8 Do (Form A) Card
(A) Side-Panel Input and Output Designations (B) Rear-Panel Layout Figure 2.10 Single Copper Ethernet With EIA-232 Communication, 10 RTD Card, 4 DI/4 DO Card and 2 AVI/4 AFDI Voltage Option Card With Arc-Flash Detector Inputs (Relay MOT 751501A1A9X70850230) SEL-751 Relay Instruction Manual Date Code 20170927...
Page 77: Figure 2.11 No Ethernet, Eia-232 Serial Communications, Eia-232/Eia-485 Communications Card, 8 Di Card, And 8 Do Card (Form A) (Relay Mot 751401Aa03A2A850000)
Figure 2.12 Dual Copper Ethernet, 4 DI/4 DO Card, 14 DI Card, 8 AFDI With Arc-Flash Detector Inputs, 4 ACI/3 AVI Card With 5 A Phase, 200 mA Neutral, and Three-Phase AC Voltage Inputs (300 Vac) (Relay MOT 7515S1A1A4A77870671) Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 78: Figure 2.13 Dual Copper Ethernet, 14 Di Card, 8 Do (Form B) Card, 2 Avi/4 Afdi Card
Figure 2.14 Dual 10/100 Base-T Ethernet, EIA-232 Rear Port, Without Single Multimode ST Fiber-Optic Serial Port Rear, With DeviceNet Card, Fast Hybrid 4 DI/4 DO Card, 8 DI Card and 4 ACI Card (No Voltage Inputs) (Relay MOT 751001AA3CA3AA50F30) SEL-751 Relay Instruction Manual Date Code 20170927...
Page 79 SEL-3530 RTAC and bring the IRIG-B signal with the EIA-232 input. Use a fiber-optic cable pair with ST connectors (SEL-C805 or SEL-C807) to con- nect to Port 2 on the SEL-751. Refer to Section 7: Communications for details on IRIG-B connections examples and on SEL-2401/2407/2404 for time source.
Page 80 Relay Connections Ethernet Port The SEL-751 can be ordered with an optional single/dual 10/100BASE-T or 100BASE-FX Ethernet port. Connect to Port 1 of the device by using a standard RJ45 connector for the copper port and an LC connector for the fiber- optic port.
Page 81: Figure 2.15 Control I/O Connections-4 Ai/4 Ao Option In Slot D And Fiber-Optic Port In Slot B
All digital inputs to SEL-2600 Series and digital outputs Contacts (including high-current, high-speed hybrid) connections are polarity — — neutral. AO401 AO404 SEL-751 Relay AI401 AI404 IRIG-B –/N — — B01 B02 +IRIG-B –IRIG-B As Many as Four Analog Inputs Figure 2.15 Control I/O Connections—4 AI/4 AO Option in Slot D and Fiber-Optic Port in Slot B...
Page 82: Table 2.18 Typical Maximum Rtd Lead Length
<8 ms (the same time as for a normal output contact). Contacts shown with OUT103 OUT103 relay coil de-energized Relay Coil Figure 2.18 Output OUT103 Relay Output Contact Configuration SEL-751 Relay Instruction Manual Date Code 20170927...
Page 83: Figure 2.19 Out103 Contact Fail-Safe And Nonfail-Safe Options
➤ The relay coil is energized continuously if the SEL-751 is powered and operational. ➤ When the SEL-751 generates a trip signal, the relay coil is de- energized. ➤ The relay coil is also de-energized if the SEL-751 power supply voltage is removed or if the SEL-751 fails (self-test status is FAIL).
Page 84: Figure 2.20 Single-Phase Voltage Connections
(a) Single Phase-Neutral VT Connection (b) Single Phase-Phase VT Connection (DELTA_Y := WYE and SINGLEV := Y) (DELTA_Y := DELTA and SINGLEV := Y) A B C A B C SEL-751 SEL-751 Figure 2.20 Single-Phase Voltage Connections SEL-751 Relay Instruction Manual Date Code 20170927...
Page 85: Figure 2.21 Voltage Connections
C-Phase instead of B-Phase, as shown in figures (e) and (f), provided all other connections remain as shown. Terminals E01 or E02 can be used to input VAB voltage from the bus to the VS/NS input on the relay with NS terminal grounded. Figure 2.21 Voltage Connections Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 86 VTs rated 14000:115 V (PTR := 121.74), the setting for VNOM would be 12500 V/121.74 = 102.68 V. The SEL-751 automatically sets VNOM := OFF and hides the setting when the setting SINGLEV := Y. In Table 4.4, a setting of SINGLEV := OFF is shown to disable/turn-off a number of features.
Page 87: Figure 2.22 Typical Current Connections
Station DC Battery Use the station dc battery monitor (one of the options available with the Voltage Card options) in the SEL-751 to alarm for undervoltage and Monitor overvoltage dc battery conditions and to view how station dc battery voltage fluctuates during tripping, closing, and other dc control functions.
Page 88: Figure 2.23 Sel-751 Provides Overcurrent Protection And Reclosing For A Distribution Feeder (Includes Fast Bus Trip Scheme) (Delta-Connected Pts)
). But in this residual connection example, the neutral ground and residual ground overcurrent elements operate the same because Figure 2.23 SEL-751 Provides Overcurrent Protection and Reclosing for a Distribution Feeder (Includes Fast Bus Trip Scheme) (Delta-Connected PTs) SEL-751 Relay...
Page 89: Figure 2.24 Sel-751 Provides Overcurrent Protection For A Distribution Bus (Includes Fast Bus Trip Scheme) (Wye-Connected Pts)
INxxx is shown for use with a fast bus trip scheme. The fast bus trip scheme is often referred to as a reverse-interlocking or zone-interlocking scheme. Figure 2.24 SEL-751 Provides Overcurrent Protection for a Distribution Bus (Includes Fast Bus Trip Scheme) (Wye-Connected PTs)
Page 90: Figure 2.25 Transmission Line Directional Overcurrent Protection And Reclosing With Current-Polarization Source Connected To Channel In (Wye-Connected Pts)
2.34 Installation AC/DC Control Connection Diagrams TRANSFORMER BANK SEL-751 RELAY (—) Trip Circuit OUT103 Trip Coil (—) Close Circuit OUT102 Close Coil (—) Breaker Failure Trip OUTxxx Lock Circuit to Annunciator, RTU, OUT101 SEL-2032/2030/2020, ALARM or SEL-3530 RTAC (—) INxxx Breaker Status (—) From Feeder Relays...
Page 91: Figure 2.26 Sel-751 Provides Overcurrent Protection For A Delta-Wye Transformer Bank (Wye-Connected Pts)
(e.g., hot bus check). For sensitive earth fault (SEF) applications, the SEL-751 should be ordered with channel IN rated at 0.2 A nominal. See AC Current Input specifications on page 1.13. See neutral ground overcurrent element pickup specifications in Table 4.9 and Table 4.15.
Page 92: Figure 2.27 Sel-751 Provides Overcurrent Protection For A Transformer Bank With A Tertiary Winding (Wye-Connected Pts)
Although automatic reclosing is probably not necessary in this example, output contact OUT102 can close the circuit breaker via initiation from various means (serial port communications, optoisolated input assertion, etc.), with desired supervision (e.g., hot bus check). Figure 2.27 SEL-751 Provides Overcurrent Protection for a Transformer Bank With a Tertiary Winding (Wye-Connected PTs) SEL-751 Relay...
Page 93: Figure 2.28 Sel-751 Provides Overcurrent Protection For An Industrial Distribution Feeder (Core-Balance Current Transformer Connected To Channel In)
Although automatic reclosing is probably not necessary in this example, output contact OUT102 can close the circuit breaker via initiation from various means (serial port communications, optoisolated input assertion, etc.), with desired supervision. Figure 2.28 SEL-751 Provides Overcurrent Protection for an Industrial Distribution Feeder (Core-Balance Current Transformer Connected to Channel IN) Date Code 20170927...
Page 94: Figure 2.29 Sel-751 Provides Overcurrent Protection For A High-Impedance Or Low-Impedance Grounded System (Wye-Connected Pts)
ORDER := U (see Table 4.19–Table 4.21). Nondirectional sensitive earth fault (SEF) protection is also available. Figure 2.29 SEL-751 Provides Overcurrent Protection for a High-Impedance or Low-Impedance Grounded System (Wye-Connected PTs)
Page 95: Figure 2.30 Sel-751 Provides Overcurrent Protection For A Petersen Coil-Grounded System (Wye-Connected Pts)
Directional control for a Petersen coil-grounded system is selected with setting ORDER containing P (see Table 4.19– Table 4.21). Nondirectional sensitive earth fault (SEF) protection is also available. Figure 2.30 SEL-751 Provides Overcurrent Protection for a Petersen Coil-Grounded System (Wye-Connected PTs)
Page 96: Figure 2.31 Sel-751 Provides Overcurrent Protection For An Ungrounded System (Wye-Connected Pts)
Directional control for an ungrounded system is selected with setting ORDER := U (see Table 4.19–Table 4.21). Nondirectional sensitive earth fault (SEF) protection is also available. Figure 2.31 SEL-751 Provides Overcurrent Protection for an Ungrounded System (Wye-Connected PTs) SEL-751 Relay...
Page 97: Figure 2.32 Sel-751 Provides Overcurrent Protection For An Ungrounded System (Open-Delta Connected Pts, Broken-Delta 3V0 Connection)
The step-down transformer is required when the maximum expected residual voltage exceeds the relay voltage channel rating. The polarity of voltage input VS-NS connection should be verified prior to placing the relay into service. Figure 2.32 SEL-751 Provides Overcurrent Protection for an Ungrounded System (Open-Delta Connected PTs, Broken-Delta 3V0 Connection) Date Code 20170927...
Page 98: Figure 2.33 Sel-751 With A 2 Avi/4 Afdi Option Card And The Fiber-Optic-Based Point-Sensor
I/O designations for a relay model with the 8 AFDI card. Installa- tion instructions for the 8 AFDI card are similar to the 2 AVI/4 AFDI card. Figure 2.33 SEL-751 With a 2 AVI/4 AFDI Option Card and the Fiber-Optic- Based Point-Sensor...
Page 99: Figure 2.34 Black-Jacketed Fiber Installation Example
Although easily detected by the sensor diagnostics, such problems can be eliminated through careful installation planning. Once routed, fiber sensors are connected to the SEL-751 as shown in Figure 2.33. Point-Sensor...
Page 100: Figure 2.37 Point-Sensor Directivity (0-360° Around The Mounting Plane)
70° 280° 80° 270° 90° 260° 100° 250° 110° 240° 120° 230° 130° 220° 140° 210° 150° 200° 160° 190° 170° 180° Figure 2.38 Point-Sensor Directivity (Front to Back, Above the Mounting Plane) SEL-751 Relay Instruction Manual Date Code 20170927...
Page 101: Figure 2.40 Clear-Jacketed Fiber Sensor Assembly
Total loop length = 2 • A + B (allowed range 3 to 70 meters) Range for A: 1 to 30 meters Range for B: 1 to 50 meters Figure 2.40 Clear-Jacketed Fiber Sensor Assembly Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 102: Figure 2.41 Clear-Jacketed Fiber Sensor Mounting Example
Figure 2.43. 5/16” diameter hole 3/8” diameter hole ST Connection (3/8” diameter hole) V-Pin Connection (5/16” diameter hole) Figure 2.43 Clear-Jacketed Fiber Sensor Showing Transition From Clear- to Black-Jacketed Fiber Section SEL-751 Relay Instruction Manual Date Code 20170927...
Page 103: Figure 2.44 Switchgear Application Example
Figure 2.44 shows a typical switchgear application example with one incom- ing and two radial (outgoing) feeders. All three feeders are protected with an SEL-751 controlling breakers 1, 2, and 3. Radial feeder breakers 2 and 3 must be tripped for downstream faults, normally located in the outgoing cable ter- mination compartment.
Page 104: Table 2.19 Optical Budget Calculations
– (0.175 dB/m x A dimension x 2) –10.5 dB Total Link Losses = –10.5 dB Dual V-Pin Latch Sensors Black-Jacketed Fiber Zipcord Duplex V-Pin Terminators 1–35 Meters Figure 2.46 Point Sensor Assembly SEL-751 Relay Instruction Manual Date Code 20170927...
Page 105: Figure 2.47 Bare-Fiber Sensor Assembly With Two Additional St Splice Connectors
Link Budget 12.25 dB – (2 dB x # of connector splices) –4 dB Link Losses = available for A meters 8.25 dB ÷ (2 x 0.175 dB/m) 23.6 meters maximum A dimension Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 106: Figure 2.48 Point Sensor Assembly With Two V-Pin Splice Connectors
Figure 2.48 Point Sensor Assembly With Two V-Pin Splice Connectors Field Serviceability The SEL-751 firmware can be upgraded in the field; refer to Appendix B: Firmware Upgrade Instructions for firmware upgrade instructions. You may know when a self-test failure has occurred by configuring an output contact to...
Page 107 Keep Step 8. Replace the relay rear panel and energize the relay. battery out of reach of children. Step 9. Set the relay date and time. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 108 This page intentionally left blank...
Page 109: Table 3.1 Sel Software Solutions
Allows you to design new bay screens and edit existing bay screens by launching ERATOR Bay Screen Builder SEL-5036 Software for SEL-751 relays with the color touchscreen display. Setting Database Management QuickSet uses a database to manage the settings of multiple devices.
Page 110: Table 3.2 Ac Sel Erator Quickset Sel-5030 Software
Provides general QuickSet and device-specific QuickSet context help. Available only in licensed versions of QuickSet. Setup Follow the steps outlined in Section 2: Installation to prepare the SEL-751 for use. Perform the following steps to initiate communications: Step 1. Connect the appropriate communications cable between the SEL-751 and the PC.
Page 111: Figure 3.3 Network Communication Parameters Dialog Box
The terminal window is an ASCII interface with the relay. This is a basic terminal emulation. Many third-party terminal emulation programs are available with file transfer encoding schemes. Open the terminal window by either clicking Communications > Terminal or by pressing <Ctrl+T>. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 112: Figure 3.5 Device Response To The Id Command
QuickSet uses a database to save relay settings. QuickSet ERATOR contains sets of all settings files for each relay specified in the Database Manager. Choose appropriate storage backup methods and a secure location for storing database files. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 113 Step 2. Type the new database name (and location if the new location differs from the existing one), and click Save. QuickSet displays the message Settings [path and filename] was successfully created Step 3. Click OK. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 114: Settings
SEL-751. QuickSet makes setting the relay easy and efficient. However, you do not have to use QuickSet to configure the SEL-751; you can use an ASCII terminal or a computer running terminal emulation software. QuickSet provides the...
Page 115: Table 3.3 File/Tools Menus
Selection dialog box. QuickSet uses the Z-number in the FID string to create a particular version of settings. To get started making SEL-751 settings with the Settings Editor in the Editor Mode, select File > New from the main menu bar, and SEL-751 and 004 from the Settings Editor Selection window as shown in Figure 3.6.
Page 116: Figure 3.7 Update Part Number
Z-Number Figure 3.8 New Setting Screen File > Open The Open menu item opens an existing device from the active database folder. QuickSet prompts for a device to load into the Settings Editor. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 117 Expression Builder organizes device elements, analog quantities, and Expression Builder. control equation variables. OGIC Access the Expression Builder Use the Ellipsis buttons in the Settings dialog boxes of Settings Editor windows to create expressions, as shown in Figure 3.9. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 118: Figure 3.9 Expressions Created With Expression Builder
Design Using QuickSet and Bay Screen Builder on page 9.6. File > Save Select the Save menu item from the File menu item of the Settings Editor once settings are entered into QuickSet to ensure that the settings are not lost. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 119: Figure 3.10 Composite Screens For Retrieving Events
QuickSet has integrated analysis tools that help you retrieve ERATOR information about relay operations quickly and easily. Use the event information that the SEL-751 stores to evaluate the performance of a system (select Tools > Events > Get Event Files). Figure 3.10 shows composite screens for retrieving events.
Page 120: Figure 3.11 Saving The Retrieved Event
Tools > Events > Get Event Files. The Event History dialog box appears, as shown in Figure 3.10. The SEL-751 is capable of capturing three types of events (4 samples/cycle filtered, 32 samples/cycle raw, and high-impedance fault). These three types of events can be captured in either the compressed ASCII (.cev) or...
Page 121: Figure 3.12 Device Overview Screen
Relay Word bit, and click the Update button to assign the Relay Word bit to the LED. To change the color of the LED, click in the square and make your selection from the color palette. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 122: Figure 3.13 Control Screen
LDP, or trigger events. IRRORED You can also reset the targets, synchronize with IRIG, and set the time and date. If supported, you can run arc-flash sensor diagnostic tests. Figure 3.13 Control Screen SEL-751 Relay Instruction Manual Date Code 20170927...
Page 123: Figure 3.14 Remote Operation Selection
English, Spanish, French, or Chinese, as seen in Figure 3.15. Selecting any of these choices converts the menu items in QuickSet to the selected NOTE: If the SEL-751 is connected language. to any SEL communications processor (SEL-203x or RTAC), the corresponding LANG port setting must be set to ENGLISH.
Page 124: Figure 3.16 Spanish Settings Quickset Display
3.16 PC Software Meter and Control Figure 3.16 Spanish Settings QuickSet Display Each communications port (serial or Ethernet) on the SEL-751 can be independently set to display either English or Spanish. Changing the port NOTE: Once the HMI screen is...
Page 125: Figure 3.17 Spanish Control Window (Ventana De Control) Display
PC Software 3.17 Meter and Control Figure 3.17 Spanish Control Window (Ventana de Control) Display Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 126: Table 3.4 Quickset Help
Table 3.4 QuickSet Help Help Description General QuickSet Select Help from the main menu bar SEL-751 Settings Select Settings Help from the Help menu bar while the Settings Editor is open. Database Manager Select Help from the bottom of the Database...
Page 127: Overview
(see Section 6: Settings). Lists information that you need to know about the protected equipment before calculating the relay settings. Lists the settings for protection elements included in all models of the SEL-751. Group Settings (SET Command). ID Settings and Configuration Settings.
Page 128 Describes the settings and logic associated with the disconnect switches. Local/Remote Breaker Control. Describes the local/remote breaker control function. Port Settings (SET P Command). Lists the settings that configure the relay front- and rear-panel serial ports. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 129: Table 4.1 Identifier Settings
(see Figure H.1). or the Ethernet port (see Section 7: Communications). Application Data It is faster and easier for you to calculate settings for the SEL-751 if you col- lect the following information before you begin: ➤ System phase rotation and nominal frequency ➤...
Page 130: Table 4.2 Ct Configuration Settings
LEA_SC, LEA_S_R, and LEA_S_SC settings are applicable to the relay with LEA inputs (8 Vac). The LEA_R and LEA_S_R settings are settable while the LEA_SC and LEA_S_SC settings are autocalculated by the relay and not SEL-751 Relay Instruction Manual Date Code 20170927...
Page 131: Table 4.4 Effect On Group Settings When Singlev := Y
Table 4.4 Effect on Group Settings When SINGLEV := Y (Sheet 1 of 2) Identifier Settings Group Setting Change Reason VNOM Forced to OFF and hidden Loss-of-Potential logic requires three-phase voltage. Line Parameter Settings Z1MAG, Z1ANG, Hidden Impedance calculations Z0MAG, Z0ANG, require three-phase voltage. Z0SMAG, Z0SANG Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 132 In the case of LEA sensors, the calculated VNOM should be scaled by 37.5 (300/8) to set VNOM at the 300 V base as shown in the following exam- ple. The scaling (37.5) is explained in Low-Energy Analog (LEA) Voltage Inputs. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 133: Table 4.5 Main Relay Functions That Change With Vnom := Off
Available Not available Low-Energy Analog The SEL-751 can be ordered with different secondary ac input voltage config- urations—standard voltage inputs rated for 300 V and LEA voltage inputs (LEA) Voltage Inputs rated for 8 V. The LEA voltage inputs are suitable for C37.92 compliant high- impedance sensors, such as capacitive voltage dividers and resistive voltage dividers (see Figure 4.1).
Page 134 VCRCF, VSRCF, VAPAC, VBPAC, VCPAC, and VSPAC are applied to their respective voltage inputs, VA, VB, VC, and VS. These normalized secondary volt- ages are used throughout the SEL-751. Refer to Table 4.69 under Global Set- tings for these settings.
Page 135 0.883 • 10000 = 8830 (true ratio for voltage input 1.112 • 10000 = 11120 (true ratio for voltage input Note that these true ratios vary from 8830 to 11120, while the marked ratio of the voltage divider is given as 10000. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 136: Table 4.6 Line Parameter Settings
(7200 V). The relay uses these normalized second- ary voltages for all the voltage-based protection elements and metering. The true secondary voltages cannot be seen (via the SEL-751) unless the RCF val- ues are set to unity (RCF := 1.000).
Page 137: Table 4.7 Fault Locator Setting
Table 4.11 and in Figure 4.2. Each element can be torque controlled through the use of appropriate control equations (for example, when 50P1TC := IN401, the 50P1 OGIC element is operational only if IN401 is asserted). Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 138: Table 4.8 Maximum Phase Overcurrent Settings
For any phase instantaneous overcurrent for ensuring dependable short-circuit overcurrent element operation. element in the SEL-751 that is set greater than eight times the relay current input rating (40 A in a 5 A relay), the overcurrent element also operates on the NOTE:...
Page 139: Table 4.9 Neutral Overcurrent Settings
The relay offers two types of ground fault detecting overcurrent elements. The neutral overcurrent elements (50N1T through 50N4T) operate with current measured by the IN input. The residual (RES) overcurrent elements (50G1T through 50G4T) operate with the current derived from the phase currents. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 140: Figure 4.2 Instantaneous Overcurrent Element Logic
67PnT, 67NnT, 67QnT, 67GnT, and 50GnT and 50GnP 67PnP, 67NnP, 67QnP, and 67GnP When the directional control option is not ordered and EDIR is automatically set to N and hidden. Figure 4.2 Instantaneous Overcurrent Element Logic SEL-751 Relay Instruction Manual Date Code 20170927...
Page 141: Table 4.10 Residual Overcurrent Settings
50Q4TC := 1 OGIC For I = 5 A. For I = 1 A. The relay offers four negative-sequence overcurrent elements to detect phase- to-phase faults, phase reversal, single phasing, and unbalance load. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 142: Figure 4.3 Instantaneous Overcurrent Element Pickup Time Curve
51_MR respectively, each assumed equal to zero). Use the 51_CT if you want to raise the curves by a constant time. Also, you can use the 51_MR if you want to ensure the curve times no faster than a minimum response time. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 143: Table 4.12 A-, B-, And C-Phase Time-Overcurrent Settings
51CCT := 0.00 MIN RESPONSE TIM 0.00–1.00 51CMR := 0.00 TOC TRQ CONTROL 51CTC := 1 OGIC For I = 5 A. For I = 1 A. For 51_C := U_. For 51_C := C_. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 144: Table 4.13 Maximum Phase Time-Overcurrent
51P2CT := 0.00 MIN RESPONSE TIM 0.00–1.00 51P2MR := 0.00 TOC TRQ CONTROL 51P2TC := 1 OGIC For I = 5 A. For I = 1 A. For 51_C := U_. For 51_C := C_. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 145: Table 4.14 Negative-Sequence Time-Overcurrent Settings
51QCT := 0.00 MIN RESPONSE TIM 0.00–1.00 51QMR := 0.00 TOC TRQ CONTROL 51QTC := 1 OGIC For I = 5 A. For I = 1 A. For 51_C := U_. For 51_C := C_. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 146: Table 4.15 Neutral Time-Overcurrent Settings
U1, U2, U3, U4, U5, 51N2C := U3 C1, C2, C3, C4, C5 TOC TIME DIAL 0.50–15.00 51N2TD := 1.50 0.01–1.50 EM RESET DELAY Y, N 51N2RS := N CONST TIME ADDER 0.00–1.00 sec 51N2CT := 0.00 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 147: Table 4.16 Residual Time-Overcurrent Settings
51G1TC := 1 OGIC TOC TRIP LVL OFF, 0.25–24.00 A 51G2P := 0.50 0.05–4.80 A 51G2P := 0.10 TOC CURVE SEL U1, U2, U3, U4, U5, C1, C2, 51G2C := U3 C3, C4, C5 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 148: Figure 4.9 Residual Time-Overcurrent Elements 51G1T And 51G2T
The flattening may start at different points depending on the actual pickup setting, e.g., if pickup is 4.8 • I , the curve starts flattening at M = 30/4.8 = 6.25. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 149: Table 4.17 Equations Associated With U.s. Curves
(if you select electromechanical reset setting) TD = time-dial setting applied multiples of pickup current [for operating time (t ), M>1; for reset time (t ), M1] Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 150: Figure 4.10 U.s. Moderately Inverse Curve: U1
6 7 8 9 .5 .6 .7 .8 .9 1 5 6 7 8 9 Multiples of Pickup Multiples of Pickup Figure 4.12 U.S. Very Inverse Curve: U3 Figure 4.13 U.S. Extremely Inverse Curve: U4 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 151: Figure 4.14 U.s. Short-Time Inverse Curve: U5
.5 .6 .7 .8 .9 1 6 7 8 9 Multiples of Pickup Multiples of Pickup Figure 4.16 IEC Class B Curve (Very Inverse): C2 Figure 4.17 IEC Class C Curve (Extremely Inverse): C3 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 152: Figure 4.18 Iec Long-Time Inverse Curve: C4
➤ Channel IN current-polarized directional element ➤ Zero-sequence voltage-polarized directional element (low- impedance grounded system) ➤ Wattmetric and incremental conductance directional elements (Petersen coil-grounded system) ➤ Zero-sequence voltage-polarized directional element (ungrounded/high-impedance grounded system) SEL-751 Relay Instruction Manual Date Code 20170927...
Page 153 Protection and Logic Functions 4.27 Group Settings (SET Command) Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 154: Table 4.19 Available Ground Directional Elements
Zero-sequence DIRNE Figure 2.28, voltage- (Ungrounded/ Figure 2.29, polarized high-impedance) Figure 2.31, (Ungrounded/ Figure 4.25, high-impedance) Figure 4.31 S, P, and U are mutually exclusive—they cannot be listed together in the ORDER setting. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 155: Table 4.20 Best Choice Ground Directional Element Logic
(Petersen coil) DIRVE DIRNE (Petersen coil) DIRVE DIRQGE DIRNE (Petersen coil) DIRNE (Ungrounded/ high-imped- ance) S, P, and U are mutually exclusive and are the last (or only) listed choice for the order setting. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 156: Table 4.21 Ground Directional Element Availability By Voltage Connection Settings
The order in which these directional elements are listed in setting ORDER determines the priority in which they operate to provide Best Choice Ground Directional Element logic control. See the discussion on setting ORDER in Directional Control Settings on page 4.53. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 157: Table
5 amperes. When such a condition is detected, the relay switches to I . The switching logic is designed such that the switch may occur when neutral current is less than 5 amperes. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 158: Figure 4.22 Logic For Relay Word Bit Gndsw
(0.05 A secondary for 5 A nominal phase; 0.01 A secondary for 1 A nominal) is reached. It is better to have effective overlap: CTR/CTRN  100 (5 A nominal phase inputs) CTR/CTRN  500 (1 A nominal phase inputs) SEL-751 Relay Instruction Manual Date Code 20170927...
Page 159: Table
Note in Table 4.20 that any of the directional elements corresponding to S, P, or U that operate on 0.2 A nominal neutral channel (IN) are listed last (or by themselves) in any of the available setting combinations for the ORDER Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 160: Table
Enable setting EFWDLOP := Y, ➤ Global setting VSCONN := VS, ➤ A loss-of-potential condition occurs (Relay Word bit LOP asserts), ➤ And internal enable DIRIE (for channel IN current-polarized directional element) is not asserted SEL-751 Relay Instruction Manual Date Code 20170927...
Page 161: Table
In some applications, level direction settings DIR1 through DIR4 are not flex- ible enough in assigning the desired direction for certain overcurrent elements. Directional Control Provided by Torque Control Settings on page 4.77 describes how to avoid this limitation for special cases. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 162: Figure 4.23 Internal Enables (Dirqe And Dirqge) Logic For Negative-Sequence Voltage-Polarized Directional Elements
Figure 4.26 and Figure 4.37; to Figure 4.37 and Figure 4.38; to Figure 4.25, Table 4.19, and Table 4.20. Figure 4.23 Internal Enables (DIRQE and DIRQGE) Logic for Negative- Sequence Voltage-Polarized Directional Elements SEL-751 Relay Instruction Manual Date Code 20170927...
Page 163: Figure 4.24 Internal Enables (Dirve And Dirie) Logic For Zero-Sequence Voltage-Polarized And Channel In Current-Polarized Directional Elements
Figure 4.27; to Figure 4.23, Figure 4.32, Figure 4.33, Table 4.19, and Table 4.20; to Figure 4.28. Figure 4.24 Internal Enables (DIRVE and DIRIE) Logic for Zero-Sequence Voltage-Polarized and Channel IN Current-Polarized Directional Elements Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 164: Figure 4.25 Internal Enable (Dirne) Logic For Zero-Sequence Voltage-Polarized Directional Elements (Low-Impedance Grounded, Petersen Coil-Grounded, And Ungrounded/High-Impedance Grounded Systems)
Figure 4.25 Internal Enable (DIRNE) Logic for Zero-Sequence Voltage- Polarized Directional Elements (Low-Impedance Grounded, Petersen Coil- Grounded, and Ungrounded/High-Impedance Grounded Systems) Refer to EDIRIV—SEL Control Equation Enable on page 4.76 for infor- OGIC mation on using SEL setting EDIRIV. OGIC SEL-751 Relay Instruction Manual Date Code 20170927...
Page 165: Figure 4.26 Negative-Sequence Voltage-Polarized Directional Element For Neutral Ground And Residual Ground Overcurrent Elements
If Z2R Setting < 0, Reverse Threshold = 1.25 • Z2R + 0.25 • From Table 4.20; to Figure 4.32 and Figure 4.33; from Figure 4.23. Figure 4.26 Negative-Sequence Voltage-Polarized Directional Element for Neutral Ground and Residual Ground Overcurrent Elements Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 166: Figure 4.27 Zero-Sequence Voltage-Polarized Directional Element
The 3V0 input to Figure 4.27 may be either a calculated value (when VSCONN := VS and DELTA_Y := WYE) or a measured value (when VSCONN := 3V0). See Zero-Sequence Voltage Sources on page 4.33. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 167: Figure 4.28 Channel In Current-Polarized Directional Element
Reverse Threshold = —(Channel I Nominal Rating) • (Phase Channels Nominal Rating) • (0.05) From Table 4.20; to Figure 4.32 and Figure 4.33; from Figure 4.24. Figure 4.28 Channel IN Current-Polarized Directional Element Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 168: Figure 4.29 Zero-Sequence Voltage-Polarized Directional Element (Low-Impedance Grounded Systems)
The 3V0 input to Figure 4.29 may be either a calculated value (when VSCONN := VS and DELTA_Y := WYE) or a measured value (when VSCONN := 3V0). See Zero-Sequence Voltage Sources on page 4.33. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 169: Figure 4.30 Wattmetric And Incremental Conductance Directional Elements (Petersen Coil-Grounded Systems)
The 3V0 input to Figure 4.30 may be either a calculated value (when VSCONN := VS and DELTA_Y := WYE) or a measured value (when VSCONN := 3V0). See Zero-Sequence Voltage Sources on page 4.33. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 170: Figure 4.31 Zero-Sequence Voltage-Polarized Directional Element (Ungrounded/High-Impedance Grounded Systems)
The 3V0 input to Figure 4.31 may be either a calculated value (when VSCONN := VS and DELTA_Y := WYE) or a measured value (when VSCONN := 3V0). See Zero-Sequence Voltage Sources on page 4.33. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 171: Figure 4.32 Routing Of Directional Elements To Residual Ground Overcurrent Elements
The 3V0 input to Figure 4.30 may be either a calculated value (when VSCONN := VS and DELTA_Y := WYE) or a measured value (when VSCONN := 3V0). See Zero-Sequence Voltage Sources on page 4.33. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 172: Figure 4.34 Direction Forward/Reverse Logic For Residual Ground Overcurrent Elements
DIR4 = F Forward Level 4 G4DIR DIR4 = N DIR4 = R Reverse Reverse DIRGR From Figure 4.32; Figure 4.9; Figure 4.2. Figure 4.34 Direction Forward/Reverse Logic for Residual Ground Overcurrent Elements SEL-751 Relay Instruction Manual Date Code 20170927...
Page 173: Figure 4.35 Direction Forward/Reverse Logic For Neutral Ground Overcurrent Elements
Best-Choice Ground Directional Element logic, if available, to operate for ground faults. This shut-down logic is shown in the center portions of Figure 4.23 and Figure 4.38. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 174: Figure 4.36 General Logic Flow Of Directional Control For Negative-Sequence And Phase Overcurrent Elements
If a loss-of-potential condition occurs (Relay Word bit LOP asserts), the nega- tive-sequence voltage-polarized and positive-sequence voltage-polarized directional elements are disabled (see Figure 4.23 and Figure 4.38). Refer to Figure 4.73 and accompanying text for more information on loss-of- potential. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 175 Level 1 directional control outputs in Figure 4.40 and Figure 4.41 assert to logical 1. The referenced Level 1 overcurrent elements in Figure 4.40 and Figure 4.41 are then not controlled by the directional control logic. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 176: Figure 4.37 Negative-Sequence Voltage-Polarized Directional Element For Negative-Sequence And Phase Overcurrent Elements
If Z2R Setting < 0, Reverse Threshold = 1.25 • Z2R + 0.25 • To Figure 4.38 and Figure 4.39; from Figure 4.23. Figure 4.37 Negative-Sequence Voltage-Polarized Directional Element for Negative-Sequence and Phase Overcurrent Elements SEL-751 Relay Instruction Manual Date Code 20170927...
Page 177: Figure 4.38 Positive-Sequence Voltage-Polarized Directional Element For Phase Overcurrent Elements
Setting [fixed at (phase channel nominal rating) • (0.1) when enable setting ELOAD = Y] From Figure 4.54; from Figure 4.37; from Figure 4.73; to Figure 4.39. Figure 4.38 Positive-Sequence Voltage-Polarized Directional Element for Phase Overcurrent Elements Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 178: Figure 4.39 Routing Of Directional Elements To Negative-Sequence And Phase Overcurrent Elements
DIR4 = F Forward Level 4 Q4DIR DIR4 = N Relay Word DIR4 = R Reverse DIRQR Reverse From Figure 4.39; Figure 4.7; Figure 4.2. Figure 4.40 Direction Forward/Reverse Logic for Negative-Sequence Overcurrent Elements SEL-751 Relay Instruction Manual Date Code 20170927...
Page 179: Table 4.22 Directional Control Settings
ORDER := OFF PH DIR 3PH LVL 0.50–10.00 A 50PDIRP := 3.00 FWD DIR Z2 LVL –128.00 to 128.00 ohm Z2F := –0.06 REV DIR Z2 LVL –128.00 to 128.00 ohm Z2R := 0.06 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 180: Table 4.23 Wattmetric Settings
ENABLE V0 IN DIR EDIRIV := 1 OGIC Refer to Table 4.21 and Table SET.2 on page SET.6 of the SEL-751 Settings Sheets for the availability of different ORDER setting options based on voltage connection and nominal rating neutral CT.
Page 181: Table
INMTA are only available when 50NRP, a0N, 59RES, DIRWFP, DIRWRP, DIRWD, and EDIRIV EDIR = Y. (EDIRIV is a SEL setting) OGIC All these settings are explained in detail in the remainder of this subsection. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 182: Table 4.24 Directional Control Settings Not Made For Particular Conditions
67N3T (Figure 4.2) 67G3T (Figure 4.2) 67Q3T (Figure 4.2) DIR4 67P4P (Figure 4.2) 67N4P (Figure 4.2) 67G4P (Figure 4.2) 67Q4P (Figure 4.2) 67P4T (FFigure 4.2) 67N4T (Figure 4.2) 67G4T (Figure 4.2) 67Q4T (Figure 4.2) SEL-751 Relay Instruction Manual Date Code 20170927...
Page 183 DIRn (n = 1–4) settings to be directionally controlled (see Figure 4.34 and Figure 4.35). Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 184: Table
If enable setting EDIR := Y, settings Z2F and Z2R (negative-sequence imped- ance values) are calculated and entered by the user, but setting Z2R must be greater in value than setting Z2F by 0.1  secondary. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 185: Table
(system unbalance), which circulates because of line asym- metries, CT saturation during three-phase faults, etc. a2 Set Automatically. If enable setting EDIR := AUTO, setting a2 is set automatically at: a2 = Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 186 ) magnitude in order for the negative-sequence voltage-polarized directional elements to be enabled (|I | > 0.2 • |I |). Again, this presumes at least one of the internal enables DIRVE or DIRIE is asserted. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 187: Figure 4.42 Traditional Channel In Current-Polarized Directional Element
Figure 4.42, where the maximum torque line of the element is in phase with the polarizing current, I . This is adequate for solidly-grounded and most low-impedance grounded systems. Maximum Torque Line Figure 4.42 Traditional Channel IN Current-Polarized Directional Element Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 188: Figure 4.43 Current-Polarized Directional Element Characteristic When Inmta  0.00
Current Restraint Factor, I If setting ORDER does not contain V or I (no zero-sequence voltage-polarized or channel IN current-polarized directional elements are enabled), then setting a0 is not made or displayed. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 189: Table
Enables on page 4.31. If setting ORDER := U (ungrounded or high-impedance grounded system; see Figure 4.31), the following settings are made internally and hidden: -0.10  secondary Z0F = 0.10  secondary Z0R = Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 190: Figure 4.44 Zero-Sequence Impedance Network And Relay Polarity
) = –(V = –Z (what the relay sees for a forward fault) For a reverse fault, the SEL-751 effectively sees the sequence impedance in front of it: (what the relay sees for a reverse fault) If the system in Figure 4.44 is a solidly-grounded system (mostly inductive;...
Page 191: Figure 4.46 Low-Impedance Grounded Distribution System With A Ground Fault On Feeder
(effectively making it a neutral resistance) Feeder n Feeder 2 Relay 2 Feeder 1 Relay 1 Ground Fault Figure 4.46 Low-Impedance Grounded Distribution System With a Ground Fault on Feeder 1 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 192: Figure 4.47 Zero-Sequence Impedance Network For Low-Impedance Grounded Distribution System With A Ground Fault On Feeder
Figure 4.46 also shows a ground fault out on Feeder 1 (a forward fault from the perspective of Relay 1). This example assumes that SEL-751 relays (Relay 1, Relay 2, etc.) are installed at feeder positions in a distribution substation.
Page 193 Figure 4.49. The system is moving away from being a high-resistance The technical paper referenced at the end of this subsection also discusses grounded system toward being a low-resistance grounded system. directional element applications for high-resistance grounded systems. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 194: Figure 4.50 Zero-Sequence Impedance Plots For Ground Fault On Low-Impedance Grounded Distribution System
Contrastingly, the Z0MTA setting for Figure 4.50 has to allow the forward/ reverse characteristic to fit in between the forward/reverse impedance plots. The forward impedance plot is the most critical to accommodate—one defi- SEL-751 Relay Instruction Manual Date Code 20170927...
Page 195: Figure 4.51 Z0Mta Setting Provides Forward/Reverse Ground Fault Discrimination In A Low-Impedance Grounded Distribution System
Grounded Systems with High Charging Capacitances ➤ VI. Analysis of a Practical Resistance-Grounded System This subsection includes setting considerations involving the transformer bank (or grounding bank) zero-sequence impedance Z and the neutral resistance R Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 196 The a0N factor increases the security of the zero-sequence voltage-polarized directional elements: low-impedance grounded or ungrounded/high-imped- ance grounded. It keeps the elements from operating for zero-sequence current (system unbalance), which circulates because of line asymmetries, etc. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 197 LC circuit. In a “tuned state,” they cre- ate a high impedance circuit and thus a power system that is essentially ungrounded (with much less current flow than a traditional ungrounded sys- Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 198: Figure 4.52 Zero-Sequence Impedance Network For Ground Fault On Feeder 1
Relay 1/faulted Feeder 1 (labeled “WF”) is polar-opposite of the wattmetric (real power) portion for Relay 2/unfaulted Feeder 2 (labeled “WR”). The calculations for the DIRWFP and DIRWRP wattmetric pickups are made as follows: SEL-751 Relay Instruction Manual Date Code 20170927...
Page 199: Figure 4.53 Wattmetric Element Operation For Ground Fault On Feeder 1
VSCONN := 3V0. Three of the required Petersen coil element settings, 59RES, DIRWFP, and DIRWRP, depend on the type of 3V voltage source and on the PTR and PTRS group settings. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 200: Table
Watts, follows the same formula as before: W primary 24000 W primary DIRWFP 40.000 W secondary --------------------------------- - ----------------------------------------- - CTRN • • W primary 10000 W primary DIRWRP 16.667 W secondary --------------------------------- - ----------------------------------------- - CTRN • • SEL-751 Relay Instruction Manual Date Code 20170927...
Page 201 40.000 W secondary (VA, VB, VC, and IN base) • ----- - PTRS DIRWRP W secondary (VS and IN base) • ------------- - 10.417 W • ----- - 16.667 W secondary (VA, VB, VC, and IN base) Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 202: Table 4.26 Effect Of Settings Vsconn And Delta_Y On Petersen Coil Directional Elements
EDIRIV should be deasserted to OGIC logical 0. In this example, connect a circuit breaker auxiliary contact from the isolating circuit breaker to the SEL-751: EDIRIV = IN102 (52a connected to optoisolated input IN102) Almost any desired control can be set in SEL...
Page 203 Because of the long reach setting, the phase dis- tance element would pick up during heavy load. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 204: Table 4.27 Load-Encroachment Settings
Group Settings (SET Command) Load-Encroachment Settings The SEL-751 phase directional elements are supervised by a load- encroach- ment function that prevents element misoperation under heavy load. You must set load impedance magnitude and angles to the necessary values to enable load-encroachment supervision.
Page 205: Figure 4.54 Load-Encroachment Logic
Power Factor (Forward Load): 0.90 lag to 0.95 lead Power Factor (Reverse Load): 0.80 lag to 0.95 lead CT ratio: 2000/5 = 400 PT ratio: 134000/67 = 2000 The PTs are connected line-to-neutral. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 206 ° ° Setting PLAR := 180 – cos (0.95) = 180 – 18 = 162 ° –1 ° ° ° Setting NLAR := 180 + cos (0.80) = 180 + 37 = 217 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 207: Figure 4.55 High-Impedance Fault Current Levels Depend On Ground Surface Type
High-impedance fault detection with Arc Sense technology (AST) is available NOTE: Detecting high-impedance in select SEL-751 models. The part number indicates whether or not the relay faults has challenged utilities and researchers for years, especially in supports high-impedance fault detection.
Page 208 IIR filtering process from the short-term histo- gram. The long-term histogram therefore adapts to the feeder ambient load conditions and increases the overall HIF detection security. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 209: Figure 4.56 Hif Detection Block Diagram
HIF Command in Section 7: Communications for more information on the INI HIF command. After the initial tuning process, the relay retains the learned value for four hours. If a line is de-energized for more than four hours, Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 210: Table 4.28 High-Impedance Fault (Hif) Detection Settings
The SEL-751 can be applied to systems where long-term reconfiguration occurs. For example, long-term distribution system reconfiguration may occur during certain abnormal conditions to minimize the number of people that are affected.
Page 211: Table 4.29 Hif Relay Word Bits
The HIF algorithm is operating in normal tuning mode. ➤ The system configuration changes permanently or for the long term. (The line that the SEL-751 is protecting may have picked up/dropped off significant load.) Since the line configuration being monitored by the SEL-751 has changed, the load characteristics of the system may have also changed.
Page 212: Figure 4.57 A-Phase Second Harmonic Blocking
LRA, LRB, LRC, LR3 HIF Detection Event Reports and Histories The SEL-751 stores HIF detection information as compressed events and as event summaries, logs, and histories. See High-Impedance Fault Event Sum- mary on page 10.30, High-Impedance Fault Compressed Event Report on page 10.34, and Figure 7.20, Figure 5.15: MET H (HIF) Command Response,...
Page 213: Table 4.30 Second-Harmonic Blocking Settings
For time-overcurrent elements, it may be desirable for the element to continue timing when transformer inrush is detected, yet trip the breaker if the time-overcurrent element remains asserted after the inrush conditions have subsided. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 214 Consider this when evaluating time-overcurrent coordination and when reviewing event reports in which harmonic blocking has operated. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 215: Table 4.31 Rtd Settings
When you connect an SEL-2600 RTD Module (select E49RTD := EXT) or order the internal resistance temperature device (RTD) card option (select E49RTD := INT), the SEL-751 offers several protection and monitoring func- Figure 2.15 tions, settings for which are described in Table 4.31. See for the RTD module fiber-optic cable connections.
Page 216: Table 4.32 Rtd Resistance Versus Temperature
➤ 10-ohm copper (CU10) RTD Trip/Warning Levels The SEL-751 provides temperature warnings and trips through use of the RTD temperature measurements and the warning and trip temperature settings, ALTMPn and TRTMPn, in Table 4.17. The relay issues a winding temperature warning if any of the healthy winding...
Page 217 18.73 IEC Thermal Elements The SEL-751 implements three independent thermal elements that conform to the IEC 60255-149 standard. Use these elements to activate a control action or issue a warning or alarm when your power line overheats as a result of adverse operating conditions.
Page 218 Additionally, the relay calculates the maximum continuous current (IMC), according to Equation 4.8:  KCONS IBAS Equation 4.8 where: KCONS = User-selectable maximum operating temperature of the equipment IBAS = Basic current value in per unit SEL-751 Relay Instruction Manual Date Code 20170927...
Page 219 Equation 4.12. THRL   TCONC x   ln  THRLS --------------------------------------------------------- -     THLTDR THLT 100 Equation 4.12 Otherwise, the relay does not calculate the time to lockout release. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 220: Figure 4.59 Thermal Alarm And Trip Logic
See Table 4.33 for a list of the prompt, ranges, and default settings for the fol- lowing thermal element settings. The enable IEC thermal element (E49IEC) setting enables 1, 2, or 3 independent thermal elements. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 221 The heating thermal time constant (TCONHnx) setting defines the heating thermal time constant of thermal element n in state x of the equipment when the equipment is energized (i.e., when the current is above the IEQPU value). Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 222: Table 4.33 Iec Thermal Element Settings
1–500 min TCONHnx := 60 COOL TIME CONS 1–500 min TCONCnx := 60 TRIP PU 1–150% THLTn := 100 ALARM PU 1–100% THLAn := 50 TRIP DO RATIO 0.01–0.99 PU THLTDRn := 0.98 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 223: Table 4.34 Undervoltage Function
(DELTA_Y := WYE) as shown in Figure 2.21. When a synchronism voltage input is present (e.g., VS input shown in Figure 2.21) the SEL-751 provides two levels of VS under- and overvoltage elements. You can use these elements to control reclosing logic described later.
Page 224: Table 4.35 Overvoltage Function
UVS LEVEL 2 Off, 2.00–300.00 V 59S2P := OFF UVS DELAY 2 0.00–120.00 sec 59S2D := 0.50 Setting range shown is for DELTA_Y := DELTA. Setting range shown is for DELTA_Y := WYE. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 225: Figure 4.61 Undervoltage Element Logic
Bits 27PP1 27PP1D 27PP1P 27PP1T 27PP2 27PP2D 27PP2P 27PP2T |VS| 27S1 27S1D 27S1P 27S1T 27S2 27S2D 27S2P 27S2T Note: 27S1P, 27S2P, 27P1P, 27P2P, 27PP1P, and 27PP2P are settings Figure 4.61 Undervoltage Element Logic Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 226: Figure 4.62 Overvoltage Element Logic
59Q2T |3V0| |VS| | VS | 59S1 59S1D 59S1P 59S1T 59S2 59S2D 59S2P 59S2T Note: 59S1P, 59S2P, 59P1P, 59P2P, 59PP1P, 59PP2P, 59Q1P, 59Q2P, 59G1P, and 59G2P are settings Figure 4.62 Overvoltage Element Logic SEL-751 Relay Instruction Manual Date Code 20170927...
Page 227: Table 4.36 Operating Quantities For The 27I Element
Protection and Logic Functions 4.101 Group Settings (SET Command) Inverse-Time The SEL-751 provides two inverse-time undervoltage protection elements (27I1 and 27I2). Based on relay hardware options and settings, the 27I ele- Undervoltage ment offers the flexibility of using various analog quantities as operating Protection quantities.
Page 228: Table 4.37 Inverse-Time Undervoltage Settings
TRQ CONTROL 27InTC := 1 OGIC The SEL-751 provides three curve options for each of the 27I elements, setta- ble via the 27InCRV setting—CURVEA, CURVEB, and COEF (user pro- grammable curve). CURVEA is compliant with IEC 60255-127 and is the IEC standard curve as shown in Figure 4.64.
Page 229: Table 4.39 Operating Quantities For The 59I Element
VS: Magnitude of Vsync voltage VB: Magnitude of B-phase voltage MAXLL: Magnitude of the maximum phase-to-phase voltage VC: Magnitude of C-phase voltage MAXLN: Magnitude of the maximum phase-to-neutral voltage VG: Magnitude of zero-sequence voltage Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 230: Table 4.40 Inverse-Time Overvoltage Settings
TRQ CONTROL 59InTC := 1 OGIC The SEL-751 provides four curve options for each of the 59I elements, setta- ble via the 59InCRV setting—CURVEA, CURVEB, CURVEC, and COEF (user-programmable curve). The characteristics of Curve A, Curve B, and Curve C are shown in Figure 4.66.
Page 231: Table 4.41 Specification Of Inverse-Time Overvoltage Protection Element
Time Dial = 2 Time Dial = 5 Time Dial = 1 Time Dial = 2 Time Dial = 1 Multiples of Pickup Multiples of Pickup Multiples of Pickup Figure 4.66 Inverse Time-Overvoltage Element Curves Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 232: Figure 4.67 Synchronism-Check Voltage Window And Slip Frequency Elements
Block Synchronism Check BSYNCH Enable to Angle Difference Calculator—to Slip Frequency Calculator Slip Slip Frequency Absolute Value Frequency Element Setting Maximum Slip Frequency 25SF Figure 4.68 Figure 4.67 Synchronism-Check Voltage Window and Slip Frequency Elements SEL-751 Relay Instruction Manual Date Code 20170927...
Page 233: Figure 4.68 Synchronism-Check Elements
25A2 25ANG2 Angle Difference Increasing Last Check of Setting OGIC 79CLS (w) From Figure 4.67; see Figure 4.81. Figure 4.68 Synchronism-Check Elements These synchronism-check elements are explained in detail in the following text. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 234: Table 4.42 Synchronism-Check Settings
The angle setting choices (0, 30, …, 300, or 330 degrees) for setting SYNCPH are referenced to VAB, and they indicate how many degrees VS constantly lags VAB. In this application, voltage input VA-VB has to be connected and has SEL-751 Relay Instruction Manual Date Code 20170927...
Page 235 See the Application Guide entitled Compensate for Constant Phase Angle Dif- ference in Synchronism Check with the SEL-351 Relay Family (also applies to SEL-751) for more information on setting SYNCPH with an angle setting. Synchronism-Check Elements Voltage Inputs The two synchronism-check elements are single-phase elements, for both of which you would use single-phase voltage inputs VP and VS: 1.
Page 236 For example, in Figure 4.67, if voltage VP has a frequency of 59.95 Hz and voltage VS has a frequency of 60.05 Hz, the difference between them is the slip frequency: Slip Frequency = 59.95 Hz – 60.05 Hz = –0.10 Hz = –0.10 slip cycles/ second SEL-751 Relay Instruction Manual Date Code 20170927...
Page 237 The Angle Difference Calculator calculates the angle difference between voltages VP and VS, compensated with the breaker close time: Angle Difference = |(VP – VS) + [(fP – fS) • TCLOSD • (1 / 1000) • (360°/slip cycle)]| Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 238: Figure 4.69 Angle Difference Between Vp And Vs Compensated By Breaker Close Time (Fp < Fs And Vp Shown As Reference In This Example)
During the breaker close time (TCLOSD), the voltage angle difference between voltages VP and VS changes by 3.6 degrees. This angle compensa- tion is applied to voltage VS, resulting in derived voltage VS*, as shown in Figure 4.69. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 239 25A1 or 25A2 assert to logical 1. In this scenario of the Angle Difference increasing, but still being less than maximum angle settings 25ANG1 or 25ANG2, the operation of corresponding synchronism-check elements 25A1 and 25A2 becomes less restrictive. Synchronism-check Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 240 For example, set 25ANG1 = 15 degrees and use the resultant synchronism- Automatic Reclosing check element in the reclosing relay logic to supervise automatic reclosing, and Manual Closing e.g., 79CLS := 25A1 OR … (see Figure 4.81) SEL-751 Relay Instruction Manual Date Code 20170927...
Page 241: Table 4.43 Voltages When Setting Singlev := Y
Power Elements You can enable as many as two independent three-phase power elements in the SEL-751. Each enabled element can be set to detect real power or reactive power. When voltage inputs to the relay are from delta-connected PTs or when you use a single voltage input, the relay cannot account for unbalance in the voltages in calculating the power.
Page 242: Figure 4.70 Three-Phase Power Elements Logic
Figure 4.70. If the protection application requires overcurrent protection in addition to the power elements, there may be a race condition, during a fault, between the overcurrent element(s) and the SEL-751 Relay Instruction Manual Date Code 20170927...
Page 243: Table 4.45 Power Factor Settings
If the measured power factor falls below the leading or lagging level for longer than the time-delay setting, the relay can issue a warning or trip signal. The power factor elements are enabled 55DLY seconds after Relay Word 52A is Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 244: Figure 4.72 Power Factor Elements Logic
55LGTP Figure 4.72 Power Factor Elements Logic Loss-of-Potential The SEL-751 sets Relay Word bit LOP (loss-of-potential) upon detecting a loss of relay ac voltage input such as that caused by blown potential fuses or (LOP) Protection by the operation of molded-case circuit breakers. Because accurate relaying...
Page 245: Table 4.46 Loss-Of-Potential (Lop) Setting
… OR (27P1T OR 27P2T OR 55T) AND NOT LOP … and remove 55T from TR You can supervise each element separately or as a group when these elements occur in the trip equations, as shown in this example. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 246: Figure 4.73 Loss-Of-Potential (Lop) Logic
The vector shift element in the SEL-751 is designed for applications where a DG is connected to either the utility or other main generators that require fast disconnection upon detection of an islanding condition.
Page 247: Figure 4.74 Logic Diagram Of The Vector Shift Element
78VSAPU. If the calculated angle shift is greater than the angle shift threshold setting 78VSAPU, the comparator output for the corresponding phase will be one; this output is fed to the angle shift count calculator logic. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 248 For instance, block the element for a few cycles when the DG breaker is closed to keep the ele- ment secure from operating under this condition. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 249: Table 4.47 Vector Shift Element Settings
78VSBL := 0 OGIC Frequency Protection The SEL-751 provides six trip over- or underfrequency elements with inde- pendent level and time-delay settings. Table 4.48 lists the ranges and settings. When an element level setting is less than the nominal frequency setting, the element operates as an underfrequency element.
Page 250: Table 4.49 Rate-Of-Change-Of-Frequency Settings
You can use the rate-of- change-of-frequency element to detect and initiate a remedial action. The SEL-751 provides four rate-of-change-of-frequency elements. Table 4.49 shows the settings available for the elements. Table 4.49 Rate-of-Change-of-Frequency Settings (Sheet 1 of 2)
Page 251: Table 4.50 Time Window Versus 81Rntp Setting
CTs (1 A or 5 A). Use E81R setting to enable the number of elements you want; Figure 4.76 shows the element logic. The SEL-751 measures frequency (mf1) and second frequency (mf2) after a time window (dt) determined by Trip Level setting (81RnTP).
Page 252: Figure 4.77 81Rf Characteristics
The elements uses the settings 81RFDFP in Hz and 81RFRP in Hz/s to config- ure the characteristic (see Table 4.51). DF3C Hz/s (df/dt calculated over 3-cycle window) +81RFRP Trip Region 1 —81RFDFP —0.1 DF (FREQ-FNOM) Hz +81RFDFP —0.2 Trip Region 2 —81RFRP Figure 4.77 81RF Characteristics SEL-751 Relay Instruction Manual Date Code 20170927...
Page 253: Table 4.51 Fast Rate-Of-Change-Of-Frequency Settings
SEL technical paper, Mitigating the Aurora Vulnerability With Existing Technology, available on the SEL website. More detailed application considerations can be found in the SEL Application Guide, AG2010-03, Aurora Mitigation Using the SEL-751 Relay, also available on the SEL website. Table 4.51 Fast Rate-of-Change-of-Frequency Settings Setting Prompt...
Page 254: Figure 4.78 81Rf Fast Rate-Of-Change-Of-Frequency Logic
Figure 4.78 81RF Fast Rate-of-Change-of-Frequency Logic Trip/Close Logic The SEL-751 tripping logic is designed to trip the circuit breakers. The relay logic lets you define the conditions that cause a trip, the conditions that unlatch the trip, and the performance of the relay output contact. Figure 4.79 illustrates the tripping logic.
Page 255: Table 4.52 Trip/Close Logic Settings
(TDURD) setting. TR Trip Conditions SEL Control Equation OGIC The SEL-751 TR SEL control equation provides the trip logic to trip the OGIC breaker. The Relay Word bit TRIP is associated with the TR SEL control OGIC equation.
Page 256 The default 52B setting is NOT 52A. The factory-default set- related to bay control disconnect ting assumes no auxiliary contact connection (52A := 0). switch symbols, refer to Table 9.5 and the corresponding descriptions. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 257 Table 9.5 and the corresponding description. on page 9.5. CL Close SEL Control Equation OGIC The SEL-751 Close Logic offers three ways to close the circuit breaker: ➤ Conditions mapped to CL ➤ Front-panel or serial port (including Modbus and DeviceNet) CLOSE command ➤...
Page 258: Figure 4.81 Reclose Supervision Logic (Following Open Interval Time-Out)
Reclose Supervision condition, Reclose Initiate to lockout if Reclose 79RI 79CLS, to assert to logical 1) Supervision Limit Timer times out. To Figure 4.80 Figure 4.81 Reclose Supervision Logic (Following Open Interval Time-Out) SEL-751 Relay Instruction Manual Date Code 20170927...
Page 259: Figure 4.82 Reclose Supervision Limit Timer Operation
See the Table 4.54 for Recloser Control settings. For Most Applications Refer to the top of Figure 4.81. For most applications, the Reclose Supervision Limit Time setting should be set to zero seconds: 79CLSD := 0.00 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 260 If setting E79 := 1, 2, 3, or 4, the reclosing relay is driven to lockout state. The logic in the bottom of Figure 4.81 is explained in more detail in the fol- lowing text. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 261 EXAMPLE 4.17 Settings Example 1 Refer to the top of Figure 4.81 and Figure 4.83. SEL-751 Relays are installed at both ends of a transmission line in a high- speed reclose scheme. After both circuit breakers open for a line fault, the...
Page 262: Figure 4.83 Sel-751 Relays Installed At Both Ends Of A Transmission Line In A High-Speed Reclose Scheme
79STL := 0 The SEL-751(2) starts open interval timing after circuit breaker 52/1 at the remote end has re-energized the line. The SEL-751(2) has to see Bus 2 hot, transmission line hot, and in synchronism across open circuit breaker 52/2 for open interval timing to begin.
Page 263 So that this possible momentary assertion of synchronism-check element 25A1 does not cause any inadvertent reclose of circuit breaker 52/2, make sure the open interval timers in the SEL-751(2) are set with some appreciable time greater than the momentary energization time of the faulted transmission line.
Page 264: Figure 4.84 Reclosing Relay States And General Operation
Figure 4.84 explains in general the different states of the reclosing relay and its operation. Reset State The circuit breaker has been closed for a qualifying reset time. The SEL-751 is ready to go through an automatic reclosing sequence in the reclose cycle state if the circuit breaker trips open and reclose initiation is successful.
Page 265: Table 4.53 Relay Word Bit And Front-Panel Correspondence To Reclosing Relay States
(e.g., flashover in the tank while breaker is open). The OPEN command is included in the reclosing relay logic via the factory control equation settings: OGIC 79DTL := OC OR … (drive-to-lockout) Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 266 52A is set to OGIC something other than numeral 0 or NA. Making the setting 52A := 0 or NA defeats the close logic and also defeats the reclosing relay. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 267: Table 4.54 Reclosing Control Settings
In the factory settings in Table 4.54, the open interval 2 time setting 79OI2 is the first open interval time setting set equal to zero: 79OI2 := 0.00 seconds Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 268: Figure 4.85 Reclosing Sequence From Reset To Lockout With Example Settings
Observe Shot Counter Operation Observe the reclosing relay shot counter operation, especially during testing, using ASCII command TARGET (e.g., TARGET Command (Display Relay Word Bit Status) on page 7.53 for detail). SEL-751 Relay Instruction Manual Date Code 20170927...
Page 269 If the reset timer is actively timing, RSTMN asserts to logical 1. If the reset timer is not timing, RSTMN deasserts to logical 0. See Block Reset Timing Setting (79BRS) on page 4.149. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 270: Table 4.55 Shot Counter Correspondence To Relay Word Bits And Open Interval Times
SEL-751 to successfully initiate reclosing and start timing on the first open interval. The SEL-751 is not yet in the reclose cycle state (79CY = logical 0) at the instant of the first trip.
Page 271 SEL-751 sees the circuit breaker close. If a flashover occurs in a circuit breaker tank during an open interval (circuit breaker open and the SEL-751 calls for a trip), the SEL-751 goes immediately to lockout. EXAMPLE 4.20 Additional Settings Example The preceding settings example initiates open interval timing on rising edge of the TRIP Relay Word bit.
Page 272 4.145). Then the drive-to-lockout condition overlaps reclose initiation and the SEL-751 stays in lockout after the breaker trips open. When 79DLS := logical 1, the reclosing relay goes to the last shot, if the shot counter is not at a shot value greater than or equal to the calculated last shot (see Reclosing Relay Shot Counter on page 4.144).
Page 273 (79STL = logical 1 still), the 79SKP setting is still processed. Once the trip condition goes away (Relay Word bit TRIP = logical 0), open interval timing can proceed. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 274: Table 4.56 Open Interval Time Example Settings
79SKP = logical 0, regardless of Relay Word bit 50P2P. EXAMPLE 4.25 Additional Settings Example 2 If you use the SEL-751 Relay on a feeder with a line-side independent power producer (cogenerator), the utility should not reclose into a line still energized by an islanded generator.
Page 275 1. Thus, the example 79BRS setting can function to block reset timing if time-overcurrent pickup 51P1P or 51G1P is picked up while the relay is in the Reclose Cycle State. This helps prevent repetitive “trip- reclose” cycling. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 276 This assertion/deassertion indicates that a downstream device (e.g., line recloser—see Figure 4.87) has operated to clear a fault. Incrementing the shot counter keeps the SEL-751 “in step” with the downstream device, as is shown in Additional Settings Example 1 on page 4.150 and Additional Settings Example 2 on page 4.152.
Page 277: Figure 4.87 Sequence Coordination Between The Sel-751 And A Line Recloser
Figure 4.88 Operation of SEL-751 Shot Counter for Sequence Coordination With Line Recloser (Additional Settings Example 1) If the SEL-751 is in the Reset State (79RS = logical 1) and then a permanent fault beyond the line recloser occurs (fault current I Figure 4.87), the line recloser fast curve operates to clear the fault.
Page 278 If the sequence coordination setting is: 79SEQ := 79RS AND 51P1P and there is a permanent fault beyond the line recloser, the shot counter of the SEL-751 increments all the way to shot = 4 (see Figure 4.88). If there is a between coincident fault the SEL-751 and the line recloser, the SEL-751 trips and goes to the lockout state.
Page 279 Figure 4.89 Operation of SEL-751 Shot Counter for Sequence Coordination With Line Recloser (Additional Settings Example 2) The line recloser continues to operate for the permanent fault beyond it, but the SEL-751 shot counter does not continue to increment.
Page 280: Table 4.57 Demand Meter Settings
Demand metering peak recording is momentarily suspended when SEL OGIC control equation setting FAULT is asserted (= logical 1). The differences between thermal and rolling demand metering are explained in the following discussion. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 281: Figure 4.91 Response Of Thermal And Rolling Demand Meters To A Step Input (Setting Dmtc = 15 Minutes)
Time (Minutes) DMTC = 15 minutes Rolling Demand Meter Response (EDEM = ROL) Time (Minutes) Figure 4.91 Response of Thermal and Rolling Demand Meters to a Step Input (Setting DMTC = 15 minutes) Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 282: Figure 4.92 Voltage Vs Applied To Series Rc Circuit
(1.0 per unit) after a time period equal to setting DMTC = 15 minutes, refer- enced to when you first apply the step current input. The SEL-751 updates thermal demand values approximately every second. Rolling Demand Meter Response The response of the rolling demand meter in Figure 4.91 (bottom) to the step current input (top) is calculated with a sliding time-window arithmetic average calculation.
Page 283 –5 to 0 minutes 1.0 per unit 0 to 5 minutes 1.0 per unit 5 to 10 minutes 2.0 per unit Rolling demand meter response at “Time = 10 minutes” = 2.0/3 = 0.67 per unit. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 284: Table 4.58 Enable Settings
Latch control switches (latch bits are the outputs of these switches) replace traditional latching devices. Traditional latching devices maintain output con- tact state. The SEL-751 latch control switch also retains state even when power to the device is lost. If the latch control switch is set to a programmable...
Page 285: Table 4.59 Latch Bits Equation Settings
OGIC tions to create custom logic for your application. The SEL-751 includes 32 latches. Table 4.59 shows the SET and RESET default settings for Latch 1 through Latch 4. The remaining latches are all set to NA. Table 4.59 Latch Bits Equation Settings...
Page 286 Control Equation Variable/Timers SV01/SV01T–SV32T OGIC You can enter as many as 15 elements per SEL control equation, includ- OGIC ing a total of 14 elements in parentheses (see Table 4.60 for more informa- tion). SEL-751 Relay Instruction Manual Date Code 20170927...
Page 287 Operator Precedence When you combine several operators and operands within a single expression, the SEL-751 evaluates the operators from left to right, starting with the high- est precedence operators and working down to the lowest precedence. This means that if you write an equation with three AND operators, for example SV01 AND SV02 AND SV03, each AND is evaluated from the left to the right.
Page 288 Boolean NOT Operator (NOT) Apply the NOT operator to a single Relay Word bit and to multiple elements (within parentheses). An example of a single Relay Word bit is as follows: SV01 := NOT RB01 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 289 0) instead of Relay Word bit assertion. When the Relay Word bit deas- serts, F_TRIG interprets this logical 1 to logical 0 transition as a “falling edge” and asserts to logical 1 for one processing interval, as shown in Figure 4.96. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 290: Figure 4.96 Result Of Falling-Edge Operator On A Deasserting Input
(MV01) is equal to 45 in value, output contact OUT102 deasserts (effectively OUT102 := logical 0). Table 4.61 shows other operators and values that you can use in writing SEL control equations. OGIC SEL-751 Relay Instruction Manual Date Code 20170927...
Page 291: Table 4.62 Sel Ogic Variable Settings
OUT401 OUT401 Figure 4.97 Example Use of SEL Variables/Timers OGIC SV/Timers Settings The SEL-751 includes 32 SEL variables. Table 4.62 shows the pickup, OGIC dropout, and equation settings for SV/Timers. Table 4.62 SEL Variable Settings (Sheet 1 of 2) OGIC...
Page 292: Table 4.63 Counter Input/Output Description
Rising-Edge Input Count Up increments the counter (follows SEL OGIC setting). SCnnCD Rising-Edge Input Count Down decrements the counter (follows setting). OGIC SCnnR Active High Input Reset counter to zero (follows SEL setting) OGIC SEL-751 Relay Instruction Manual Date Code 20170927...
Page 293: Table 4.64 Order Of Precedence Of The Control Inputs
The shaded areas illustrate the precedence of the inputs: ➤ When SC01R is asserted, the SC01LD input is ignored. ➤ When SC01R or SC01LD is asserted, rising edges on the SC01CU or SC01CD inputs are ignored. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 294: Table 4.65 Control Output Equations And Contact Behavior Settings
• • • • The SEL-751 provides the ability to use SEL control equations to map OGIC protection (trip and warning) and general-purpose control elements to the out- puts. In addition, you can enable fail-safe output contact operation for relay contacts on an individual basis.
Page 295: Table 4.66 General Global Settings
When TRIP output fail-safe is enabled and the TRIP contact is appropriately connected (see Figure 2.19), the breaker is automatically tripped when relay control power fails. See Appendix J: M Communications and SEL-751 Settings IRRORED IRRORED Sheets for details. Transmit SEL...
Page 296: Table 4.67 Event Messenger Settings
OGIC minimum metering, energy metering, and demand metering. Event Messenger You can configure the SEL-751 to automatically send an ASCII message on a communications port when the trigger condition is satisfied. Use the SET P Points command to set PROTO := EVMSG on the desired port to select that port.
Page 297: Table 4.68 Setting Group Selection
VCRCF := 1.000 VA ANGLE CORRECT –10.0 to 10.0 deg VAPAC := 0.0 VB ANGLE CORRECT –10.0 to 10.0 deg VBPAC := 0.0 VC ANGLE CORRECT –10.0 to 10.0 deg VCPAC := 0.0 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 298: Table 4.70 Lea Ratio And Phase Correction Settings For Synchronism-Check Voltage
VCPAC, and VSPAC—compensate for the phase shift on the corresponding channels caused by the voltage divider and the shielded cable bringing the voltages to the SEL-751. Refer to Ratio Correction Factors (RCF) for Voltage Inputs on page 4.8 for the discussion on the RCF and PAC settings.
Page 299 Coordinated Universal Time (UTC) Offset Setting The SEL-751 has a Global setting UTC_OFF, settable from –24.00 to 24.00 hours, in 0.25 hour increments. The relay also uses the UTC_OFF setting to calculate local (relay) time from the UTC source when configured for Simple Network Time Protocol (SNTP) updating via Ethernet.
Page 300: Table 4.72 Breaker Failure Setting
Simple Network Time Protocol (SNTP) The SEL-751 Port 1 (Ethernet Port) supports the SNTP Client protocol. See Section 7: Communications, Simple Network Time Protocol (SNTP) on page 7.14 for a description and Table 7.5 for the settings.
Page 301: Figure 4.101 Breaker Failure Logic
Refer to Application Guide AG2011-01: Using the SEL-751 and SEL-751A for Arc- Flash Detection for more details. Date Code 20170927...
Page 302: Table 4.73 Arc-Flash Overcurrent Settings
Figure 4.102 Arc-Flash Instantaneous Overcurrent Element Logic Arc-Flash Time-Overlight Elements (TOL1 through TOL8) The SEL-751 offers as many as eight fiber-optic light sensor inputs. Each input is associated with one inverse time-overlight element offering enhanced security coupled with exceptionally fast operation. Shape of the inverse-time characteristic is fixed offering robust rejection of unrelated light events with- out adding unnecessary settings.
Page 303: Table 4.74 Arc-Flash Time-Overlight Settings
Setting range with point sensor. Setting range with fiber sensor. The default processing interval in the SEL-751 is one-fourth of the power system cycle. However, to obtain a faster arc-flash protection you can select two outputs that are processed every 1/16 of a power system cycle. Use the setting AOUTSLOT to select these outputs.
Page 304: Figure 4.103 Inverse Time-Overlight Element Logic
Given the critical nature of the arc-flash protection function it is recommended that the element be set based on the ambient light level. This approach guaran- tees maximum sensitivity coupled with the fastest tripping time. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 305: Table 4.75 Typical Ambient Illumination Light Levels
To get additional speed, select the fast hybrid output option card (4DI/4DO). This card contains trip duty rated solid state output contacts, which operate within 50 µs (as much as 8 ms faster than the standard electromechanical outputs). Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 306: Figure 4.105 Analog Input Card Adaptive Name
IN302 for faster operation if desired. IRRORED Analog Inputs The SEL-751 tracks the power system frequency and samples the analog inputs four times per power system cycle. For analog inputs, set the following parameters for each input: ➤...
Page 307: Table 4.76 Summary Of Steps
±1 mA or ±1 mV. Signal offset compensation factor calculation procedure: Step 1. Turn the SEL-751 on and allow it to warm up for a few minutes. Step 2. Set the analog inputs for each analog channel to the desired range by using the AIxxxTYP, AIxxxL, AIxxxH, AIxxxEL, and AIxxxEH settings (for example, ±1 mA).
Page 308 AI301TYP:= I The next three settings define the applicable engineering unit (AI301EU), the NOTE: Because the SEL-751 accepts current values ranging from lower level in engineering units (AI301EL) and the upper level in engineering –20.48 to 20.48 mA, be sure to enter units (AI301EH).
Page 309: Table 4.77 Analog Input Card Settings In Slot
AI301EH := 20.000 AI301 LO WARN 1 OFF, –99999.000 to +99999.000 AI301LW1 := OFF AI301 LO WARN 2 OFF, –99999.000 to +99999.000 AI301LW1 := OFF AI301 LO ALARM OFF, –99999.000 to +99999.000 AI301LAL := OFF Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 310: Table 4.78 Analog Output Card Settings In Slot 3
Voltage setting range for a voltage transducer, i.e., when AI301TYP := V. Analog Outputs If an SEL-751 configuration includes the four analog inputs and four analog outputs (4 AI/4 AO) card, the analog outputs are allocated to output numbers 1-4.
Page 311: Figure 4.108 Analog Output Settings
=>> Figure 4.108 Analog Output Settings Station DC Battery The station dc battery monitor in the SEL-751 can alarm for under- or over- voltage dc battery conditions and give a view of how much the station dc bat- Monitor tery voltage dips when tripping, closing, and other dc control functions take place.
Page 312: Figure 4.109 Dc Mode Processing
Relay Word bit IN101 deasserts to a logical 0. Table 4.79 shows the settings prompt, setting range, and factory-default set- tings for a card in Slot C. See the SEL-751 Settings Sheets for a complete list of input debounce settings.
Page 313: Table 4.79 Slot C Input Debounce Settings
DSABLSET := 0 OGIC Time Synchronization The SEL-751 accepts a demodulated IRIG-B time signal. Table 4.82 shows the setting to identify the input for the signal. Set TIME_SRC := IRIG1 when Source you use relay terminals B01/B02 or EIA-232 serial Port 3 for the time signal input.
Page 314: Table 4.82 Time Synchronization Source Setting
The SEL-751 supports as many as five monitor-only, two-position discon- nects. For the disconnect switch settings and logic, refer to Disconnect Switch Disconnect Switch Symbol Settings and Status Logic on page 9.2. The SEL-751 Relay with the Status SEL touchscreen display option additionally provides the ability to design detailed OGIC single-line diagrams and display the breaker and disconnect switch status.
Page 315: Table 4.84 Ethernet Port Settings
MAXACC := 2 LANGUAGE ENGLISH, LANG := ENGLISH SPANISH TELNET PORT 23, 1025–65534 TPORT := 23 TELNET CONNECT BANNER 254 characters TCBAN := TERMINAL SERVER TELNET TIME OUT 1–30 min TIDLE := 15 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 316: Table 4.85 Port Number Settings That Must Be Unique
See Table 7.5 for a complete list of SNTP settings and their descriptions. Port Number Settings Must be Unique When making the SEL-751 Port 1 settings, port number settings cannot be used for more than one protocol. The relay checks all of the settings shown in Table 4.85 before saving changes.
Page 317: Table 4.86 Fiber-Optic Serial Port Settings
STOP := 1 NOTE: All port settings are hidden if the relay is ordered without the Port 2 PORT TIME-OUT 0–30 min T_OUT := 5 option. See the SEL-751 MOT for details. LANGUAGE ENGLISH, SPANISH LANG := ENGLISH SEND AUTOMESSAGE Y, N...
Page 318: Table 4.88 Rear-Panel Serial Port (Eia-232/Eia-485) Settings
Set PROTO := SEL (standard SEL ASCII protocol), MOD (Modbus RTU pro- tocol), or one of the M protocols, as necessary for your applica- IRRORED tion. For detailed information, refer to Appendix C: SEL Communications Processors, Appendix E: Modbus RTU Communications, Appendix F: IEC SEL-751 Relay Instruction Manual Date Code 20170927...
Page 319: Table 4.89 Rear-Panel Devicenet Port Settings
RTSCTS setting equal to Y. On Ports F, 1, 2, 3, and 4, when PROTO := SEL, use the LANG setting to communicate with the relay in English or Spanish. Refer to the SEL-751 Relay Command Summary for the commands.
Page 320: Table 4.90 Display Point And Local Bit Default Settings
If MAXACC is set to 1, the front panel only allows metering and read access to settings. If MAXACC is set to 2, the front panel allows breaker control and read/write access to settings. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 321 A display point is hidden when settings are entered (DPn = XX, where n = 01 through 32 and XX = any valid setting), but nothing shows on the front-panel display. Table 4.92 shows examples of settings that always, never, or condi- tionally hide a display point. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 322: Table 4.92 Settings That Always, Never, Or Conditionally Hide A Display Point
After connecting a Form A (normally open) auxiliary contact from the HV cir- cuit breaker to Input IN101 and a similar contact from the LV circuit breaker to Input IN102 of the SEL-751, we are ready to program the display points, using the following information for the HV breaker (LV breaker similar): ➤...
Page 323: Figure 4.112 Display Point Settings
Figure 4.115. When the HV breaker opens (LV breaker is still closed), the relay removes the line containing the HV breaker information because the Clear String Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 324: Table 4.94 Binary Entry In The Name String Only
Figure 4.118 shows the front-panel display for the entry in Table 4.94. Input IN101 is deasserted in this display ( ), but changes to when IN101=0 IN101=1 Input IN101 asserts. IN101=0 Figure 4.118 Front-Panel Display for a Binary Entry in the Name String Only SEL-751 Relay Instruction Manual Date Code 20170927...
Page 325: Table 4.95 Analog Entry In The Name String Only
Name and User Text and Formatting Strings (DP02), using the SET F command, select DP01. Set DP01 as follows: DP01 := RID, “{16}” ? IN101,"INPUT IN101:" <Enter> DP02 := TID, “{16}” ? AI301,TEMPERATURE: <Enter> Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 326: Table 4.97 Example Settings And Displays
Following is an example of an application of analog settings. Assume we also want to know the hot-spot temperature, oil temperature, and winding tempera- ture of the transformer at a certain installation. To measure these temperatures, SEL-751 Relay Instruction Manual Date Code 20170927...
Page 327: Figure 4.122 Adding Temperature Measurement Display Points
The state of the local bits is stored in nonvolatile memory every second. When power to the device is restored, the local bits return to their states after the device initialization. Each local bit requires three of the Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 328: Figure 4.124 Adding Two Local Bits
SET LB_ LABEL (7 characters; Enter NA to null) SLB02 ? NA <Enter> PULSE LB_ LABEL (7 characters; Enter NA to null) PLB02 ? START <Enter> Save changes (Y,N)? Y <Enter> Settings Saved =>> Figure 4.124 Adding Two Local Bits SEL-751 Relay Instruction Manual Date Code 20170927...
Page 329: Table 4.98 Target Led Settings
Protection and Logic Functions 4.203 Front-Panel Settings (SET F Command) Target LED Settings The SEL-751 offers the following types of LEDs. See Figure 8.2 and Figure 8.27 for the programmable LED locations: ➤ One Enable and one TRIP tricolored LEDs ➤...
Page 330: Table 4.99 Pushbutton Led Settings
PB3A_LED EQUATION PB3A_LED := NOT LT02 AND NOT 52A OGIC PB_LED ASSERTED/DEASSRTED COLORS R, G, A, O PB3BLEDC := AO PB3B_LED EQUATION PB3B_LED := 52A OR SV03 AND NOT SV03T AND OGIC SV05T SEL-751 Relay Instruction Manual Date Code 20170927...
Page 331: Report Settings (Set R Command)
SER report containing the Relay Word bit(s), new state, time stamp, and checksum (see Section 10: Analyzing Events for more information). When detecting oscillating SER items, the relay automatically deletes these oscillating items from SER recording. Table 4.100 shows the auto-removal settings. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 332: Table 4.100 Auto-Removal Settings
Use as many as 24 Relay Word elements separated by spaces or commas for each setting. Relay Word Bit Aliases Table 4.102 Enable Alias Settings Setting Name := Setting Prompt Setting Range Factory Default Enable ALIAS Settings (N, 1–20) N, 1–20 EALIAS = 4 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 333: Table 4.103 Set R Ser Alias Settings
LER setting. For LER of 15, the prefault length, PRE, must be in the range of 1–10. The relay can hold as many as seventy-nine 15-cycle event reports, eighteen 64-cycle event reports, or six 180-cycle event reports. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 334: Table 4.105 Hif Event Report Settings
DNP Analog Input Label Name 24 characters AI_01 := IB_MAG · · · DNP Analog Input Label Name 24 characters AI_99 := NA DNP Analog Output Label Name 6 characters AO_00 := NA SEL-751 Relay Instruction Manual Date Code 20170927...
Page 335: Table 4.108 User Map Register Settings
See Appendix E: Modbus RTU Communications for Modbus Register Labels and factory- default settings. Touchscreen Settings The touchscreen settings apply to relays that support the color touchscreen display and are discussed in Section 9: Bay Control (see Table 9.5). Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 336 This page intentionally left blank...
Page 337: Overview
The data are stored in nonvolatile memory. As many as 6500 time samples are stored. Station DC Battery Monitor is available as an option in the SEL-751 with the 2 AVI/4 AFDI Voltage/arc-flash detection card. Refer to Station DC Battery Monitor on page 5.15 for description and application details.
Page 338: Figure 5.1 Complex Power Measurement Conventions
Metering and Monitoring Power Measurement Conventions Power Measurement Conventions The SEL-751 uses the IEEE convention for power measurement. The implications of this convention are depicted in Figure 5.1. Source I lags V I lags V Direction of Q+ (VAR) W = –...
Page 339: Table 5.1 Measured Fundamental Meter Values
Metering and Monitoring Metering Fundamental Table 5.1 details each of the fundamental meter data types in the SEL-751. Section 8: Front-Panel Operations and Section 7: Communications describe Metering how to access the various types of meter data by using the relay front panel and communications ports.
Page 340 Voltage unbalance percent is calculated in a similar manner. The SEL-751 calculates the voltage unbalance percent in one of two ways, depending on the magnitude of the average voltage. When the average voltage ) is greater than the rated voltage Vnm, where Vnm = VNOM/1.732 when Wye, VNOM when Delta, the relay calculates the percent unbalance as shown in Equation 5.3.
Page 341: Table 5.2 Thermal Meter Values
Thermal Element n Release Time (THRLSn s) where n = 1, 2, or 3. The thermal meter function also reports the state of connected RTDs, if any have failed. Table 5.3 shows the failure messages and their meanings. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 342: Table 5.3 Rtd Input Status Messages
Figure 5.3 METER T Command Report With RTDs Energy Metering The SEL-751 includes energy metering in models with AC voltage inputs. Use this form of metering to quantify real, reactive, and apparent energy supplied to the feeder load. Following are the energy meter values.
Page 343: Table 5.4 Maximum/Minimum Meter Values
Detection 2 AVI/4 AFDI Card Option in Slot E With RTD Option or Maximum and minimum RTD temperatures (°C) SEL-2600 RTD Module With Analog Input Option Maximum and minimum analog input values (engineering units) Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 344: Figure 5.6 Meter M Command Response
The date and time of the reset are preserved and shown in the max/min meter report. =>>MET RM <Enter> Reset Metering Quantities (Y,N)? Y <Enter> Reset Complete =>> Figure 5.7 METER RM Command Response SEL-751 Relay Instruction Manual Date Code 20170927...
Page 345: Table 5.5 Rms Meter Values
Math Variable The SEL-751 includes 32 math variables. When you receive your SEL-751, no math variables are enabled. To use math variables, enable the number of Metering math variables (between 1 and 32) you require, using the EMV setting in the Logic setting category.
Page 346: Figure 5.10 Meter Ai Command Response
5.10 Metering and Monitoring Metering Analog Input The SEL-751 can monitor analog (transducer) quantities that it is measuring if equipped with optional analog inputs. Analog input metering shows Metering transducer values from standard voltage and current transducers. You can then use these values for automation and control applications within an industrial plant or application.
Page 347: Table 5.6 Demand Values
Demand metering is stored in volatile memory only and the data is lost when power to the relay is removed. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 348: Table 5.7 Synchrophasor Measured Values
PHDATAV, PHDATAI, and PHCURR. The METER PM command can function even when no serial ports are sending synchrophasor data. The METER PM command only operates when the SEL-751 is in the IRIG NOTE: To have the MET PM xx:yy:zz response transmitted from a serial timekeeping mode, as indicated by Relay Word bit TSOK = logical 1.
Page 349: Table 5.8 High-Impedance Fault Metering Measured Values
=>> Figure 5.14 MET RA Command Response High-Impedance Fault When the SEL-751 is ordered with the Arc Sense technology (AST) option for high-impedance fault detection, the relay provides high-impedance fault Metering (HIF) metering data with the METER HIF (MET H command) report. The MET HIF command displays the progress of HIF detection alarm and fault in percent of their preset pickup values (see Table 5.8 for details).
Page 350: Load Profiling
Set METHRES := N to bypass the meter threshold checks and disable the metering cutoff. Load Profiling The SEL-751 includes a load profiling function. The relay automatically records selected quantities into nonvolatile memory every 5, 10, 15, 30, or 60 minutes, depending on the LDAR load profile report setting (see Load Profile Settings on page 4.208).
Page 351: Table 5.9 Station Dc Battery Monitor Settings
Figure 5.16 LDP Command Response Station DC Battery Monitor The station dc battery monitor in the SEL-751 can alarm for under- or overvoltage dc battery conditions and give a view of how much the station dc battery voltage dips when tripping, closing, and other dc control functions take place.
Page 352: Figure 5.17 Dc Under- And Overvoltage Elements
OUTxxx = SVnT Figure 5.18 Create DC Voltage Elements With SEL Control Equations OGIC DCLO < DCHI (Top of Figure 5.18) Output contact OUTxxx asserts when: Vdc  DCLOP or Vdc  DCHIP SEL-751 Relay Instruction Manual Date Code 20170927...
Page 353 The METER command displays the station dc battery voltage (labeled VDC). Via Front Panel The information available via the previously discussed METER serial port command is also available via the front-panel Meter Menu. See Figure 8.7. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 354 Anytime the trip bus is energized, any dip in station dc battery voltage can be observed in column Vdc in the event report. Station DC Battery Voltage Dips During Circuit Breaker Closing To generate an event report when the SEL-751 closes the circuit breaker, make the SEL control equation event report generation setting: OGIC ER = R_TRIG(OUT102) OR…...
Page 355: Table 5.10 Breaker Maintenance Information For A 25 Kv Circuit Breaker
5.19 Breaker Monitor Breaker Monitor The breaker monitor in the SEL-751 helps in scheduling circuit breaker maintenance. The breaker monitor is enabled with the enable setting: EBMON := Y The breaker monitor settings in Table 5.11 are available via the SET G commands (see Table 6.3).
Page 356: Table 5.11 Breaker Monitor Settings
The following settings are made from the breaker maintenance information in Table 5.10 and Figure 5.19. Figure 5.20 shows the resultant breaker maintenance curve. COSP1 = 10000 COSP2 = 150 COSP3 = 12 KASP1 = 1.20 KASP2 = 8.00 KASP3 = 20.00 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 357: Figure 5.19 Plotted Breaker Maintenance Points For A 25 Kv Circuit Breaker
Metering and Monitoring 5.21 Breaker Monitor 10,000 1000 6 7 8 9 kA Interrupted per Operation Figure 5.19 Plotted Breaker Maintenance Points for a 25 kV Circuit Breaker Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 358: Figure 5.20 Sel-751 Breaker Maintenance Curve For A 25 Kv Circuit Breaker
COSP3 = 12 6 7 8 9 kA Interrupted per Operation Figure 5.20 SEL-751 Breaker Maintenance Curve for a 25 kV Circuit Breaker In this example, set point KASP2, COSP2 happens to be from an in-between breaker maintenance point in the breaker maintenance information in Table 5.10 and Figure 5.19, but it does not have to be.
Page 359 (e.g., in Figure 5.23, 2.5 kA is interrupted 290 times). This is not realistic, but helps in demonstrating the operation of the breaker maintenance curve and how it integrates for varying current levels. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 360: Figure 5.22 Breaker Monitor Accumulates 10 Percent Wear
10 percent curve has only 1/10 of the close/open operations of the 100 percent curve. 100% 10,000 1000 6 7 8 9 kA Interrupted per Operation Figure 5.22 Breaker Monitor Accumulates 10 Percent Wear SEL-751 Relay Instruction Manual Date Code 20170927...
Page 361: Figure 5.23 Breaker Monitor Accumulates 25 Percent Wear
25 percent curve has only 1/4 of the close/open operations of the 100 percent curve. 100% 10,000 1000 6 7 8 9 kA Interrupted per Operation Figure 5.23 Breaker Monitor Accumulates 25 Percent Wear Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 362: Figure 5.24 Breaker Monitor Accumulates 50 Percent Wear
50 percent curve has only 1/2 of the close/open operations of the 100 percent curve. 100% 10,000 1000 6 7 8 9 kA Interrupted per Operation Figure 5.24 Breaker Monitor Accumulates 50 Percent Wear SEL-751 Relay Instruction Manual Date Code 20170927...
Page 363: Figure 5.25 Breaker Monitor Accumulates 100 Percent Wear
BRE R command. Additionally, logic outputs assert for alarm or other control applications—see the following discussion. 100% 10,000 1000 6 7 8 9 kA Interrupted per Operation Figure 5.25 Breaker Monitor Accumulates 100 Percent Wear Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 364 Via Front Panel The information and reset functions available via the previously discussed serial port commands BRE and BRE R are also available via the front panel. See Section 8: Front-Panel Operations for details. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 365: Figure 5.26 Input Inxxx Connected To Trip Bus For Breaker Monitor Initiation
INxxx is asserted. SEL-751 CS/T OUT103 INxxx (Control = TRIP Switch Trip) Other External Trip Bus Trips TRIP COIL (—) Figure 5.26 Input INxxx Connected to Trip Bus for Breaker Monitor Initiation Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 366 OGIC set: BKMON = INxxx then the SEL-751 breaker monitor sees all trips. If output contact OUT103 asserts, energizing the trip bus, the breaker monitor deems it a relay initiated trip. This is because when BKMON is newly asserted (input INxxx energized), the TRIP Relay Word bit is asserted.
Page 367: Table 6.1 Methods Of Accessing Settings
Refer to Section 3: PC Software for detailed information. The SEL-751 Settings Sheets at the end of this section list all SEL-751 settings, the setting definitions, and input ranges. Refer to Section 4: Protection and Logic Functions for detailed information on individual elements and settings.
Page 368: View/Change Settings With The Two-Line Front Panel
Enter the underlined RELAY presents you with the settings as listed in the SEL-751 Settings Sheets. RELAY Use the Up Arrow, Down Arrow, Left Arrow, and Right Arrow pushbuttons to scroll through the relay settings. View and change the settings according to your needs by selecting and editing them.
Page 369: Figure 6.1 Front-Panel Setting Entry Example
Line Parameter Settings • Demand Mtr Set Power Elements Trip/Close Logic Config Menu CTRN 120.00 • • • VNOM 120.00 V PTR Setting PHASE PT RATIO PTR=00120.00 Figure 6.1 Front-Panel Setting Entry Example Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 370: Table 6.2 Show Command Options
Global configuration settings including Event Messen- Command Unavailable; ger, optoisolated input debounce timers, etc. Relay Configuration in Progress, Try Again. SET P n Port Serial port settings for serial port n (1, 2, 3, 4, or F) SEL-751 Relay Instruction Manual Date Code 20170927...
Page 371: Table 6.4 Set Command Editing Keystrokes
The SALARM Relay Word bit is set momentarily, and in the two-line display model, the ENABLED LED extinguishes while the relay is disabled. In the touchscreen display model, the ENABLED LED stays illuminated while the relay saves the setting. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 372: Table 6.5 Set Command Format
Saves Settings? before the settings are stored. If any of these checks fail, the relay issues a self-explanatory error message, and returns you to the settings list for a correction. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 373 See Section 4: Protection and Logic Functions for detailed descriptions of the settings. ➤ Some settings require an optional module. Refer to the SEL-751 Model Option Table, and the notes to the following settings for details on which settings are available in a specific model. ERATOR QuickSet SEL-5030 Software, which shows and hides settings depending on the MOT part number selected, is the best way to view settings available in a specific model.
Page 374 SET.2 SEL-751 Settings Sheets Date________________ of 78 Group Settings (SET Command) Fault Locator ZERO SQ SR Z MAG (0.10–510.00 ohm {5 A nom}, (0.50–2550.00 ohm {1 A nom}) (Hidden if DELTA_Y := WYE) Z0SMAG := ZERO SQ SR Z ANG (0.00–90.00 deg) (Hidden if := DELTA_Y := WYE) Z0SANG := LINE LENGTH (0.10–999.00 unitless)
Page 375 Date _______________ SEL-751 Settings Sheets SET.3 Residual Overcurrent Group Settings (SET Command) of 78 Residual Overcurrent RES OC TRIP LVL (OFF, 0.25–100.00 A {5 A nom}, 0.05–20.00 A {1 A nom}) 50G1P := RES OC TRIP DLY (OFF, 0.00–400.00 s) (Hidden if 50G1P := OFF)
Page 376 SET.4 SEL-751 Settings Sheets Date________________ of 78 Group Settings (SET Command) Maximum Phase Time-Overcurrent EM RESET DELAY (Y, N) (Hidden if 51BP := OFF) 51BRS := CONST TIME ADDER (0.00–1.00 s) (Hidden if 51BP := OFF) 51BCT := MIN RESPONSE TIM (0.00–1.00 s) (Hidden if 51BP := OFF)
Page 377 Date _______________ SEL-751 Settings Sheets SET.5 Neutral Time-Overcurrent Group Settings (SET Command) of 78 Neutral Time-Overcurrent TOC TRIP LVL (OFF, 0.25–24.00 A {5 A nom}, 0.05–4.80 A {1 A nom}, 10.00–960.00 mA {0.2 A nom}) 51N1P := TOC CURVE SEL (U1, U2, U3, U4, U5, C1, C2, C3, C4, C5)
Page 378: Table Set.1 Range Dependencies For The Edir Setting
SET.6 SEL-751 Settings Sheets Date________________ of 78 Group Settings (SET Command) Directional Control Directional Control (Hidden and EDIR is set to N if firmware option in the MOT is 0, 1, 3, or if Slot Z = Ax) DIR CONTROL ENBL (Y, AUTO, N) EDIR := Table SET.1 Range Dependencies for the EDIR Setting...
Page 379 Date _______________ SEL-751 Settings Sheets SET.7 Wattmetric Group Settings (SET Command) of 78 REV DIR NSEQ LVL (0.25–5.00 A {5 A nom}, 0.05–1.00 A {1 A nom}) (Auto-set to 0.05 • INOM and hidden if EDIR := AUTO. Hidden if VNOM := OFF) 50QRP := I1 RST FAC I2/I1 (0.02–0.50) (Auto-set to 0.10 and hidden if EDIR := AUTO;...
Page 380 SET.8 SEL-751 Settings Sheets Date________________ of 78 Group Settings (SET Command) Harmonic Blocking Harmonic Blocking 2ND HARM BLOCK (Y, N) EHBL2 := 2ND HARM PU (5–100%) (Hidden if EHBL2 := N) HBL2P := 2ND HARM PU DLY (0.00–320.00 s) (Hidden if EHBL2 := N) HBL2PU := 2ND HARM DO DLY (0.00–320.00 s) (Hidden if EHBL2 := N)
Page 381 Date _______________ SEL-751 Settings Sheets SET.9 Group Settings (SET Command) of 78 RTD2 LOCATION (OFF, WDG, BRG, AMB, OTH) RTD2LOC := RTD2 TYPE (PT100, NI100, NI120, CU10) (Hidden if RTD2LOC := OFF) RTD2TY := RTD2 TRIP LEVEL (OFF, 1–250°C) (Hidden if RTD2LOC := OFF) TRTMP2 := RTD2 WARN LEVEL (OFF, 1–250°C) (Hidden if RTD2LOC := OFF)
Page 382 SET.10 SEL-751 Settings Sheets Date________________ of 78 Group Settings (SET Command) IEC Thermal Element RTD11 TYPE (PT100, NI100, NI120, CU10) (Hidden if RTD11LOC := OFF or E49RTD := INT) RTD11TY := RTD11 TRIP LEVE (OFF, 1–250°C) (Hidden if RTD11LOC := OFF or...
Page 383 Date _______________ SEL-751 Settings Sheets SET.11 Undervoltage Group Settings (SET Command) of 78 COOL TIME CONS (1–500 min) (Hidden if E49IEC < 2) TCONC21 := HEAT TIME CONS (1–500 min) (Hidden if E49IEC < 2) TCONH22 := COOL TIME CONS (1–500 min) (Hidden if E49IEC < 2) TCONC22 := TRIP PU (1–150%) (Hidden if E49IEC <...
Page 384 SET.12 SEL-751 Settings Sheets Date________________ of 78 Group Settings (SET Command) Overvoltage Overvoltage (Hidden if Slot Z = Ax) OV TRIP1 LEVEL (OFF, 2.00–300.00 V) (Hidden if DELTA_Y = DELTA) 59P1P := OV TRIP1 DELAY (0.00–120.00 s) (Hidden if 59P1P := OFF or...
Page 385: Table Set.3 Range Dependencies For 27I Operating Quantities
Date _______________ SEL-751 Settings Sheets SET.13 27 Inverse-Time Undervoltage Group Settings (SET Command) of 78 27 Inverse-Time Undervoltage (Hidden if Slot Z = Ax) 27I ENABLE (Y, N) E27I1 := (The following 27I1 inverse-time undervoltage settings are hidden if E27I1 := N) ...
Page 386: Table Set.4 Range Dependencies For 59I Operating Quantities
SET.14 SEL-751 Settings Sheets Date________________ of 78 Group Settings (SET Command) 59 Inverse-Time Overvoltage 59 Inverse-Time Overvoltage (Hidden if Slot Z = Ax) 59I ENABLE (Y, N) E59I1 := (The following 59I1 inverse-time overvoltage settings are hidden if E59I1 := N) ...
Page 387 Date _______________ SEL-751 Settings Sheets SET.15 Synchronism Check Group Settings (SET Command) of 78 59I ENABLE (Y, N) E59I3 := (The following 59I3 settings are hidden if E59I3 := N)  OPERATING QTY (VS option is hidden if Slot E 70 or L0) See Table SET.4 for range dependencies.
Page 388 SET.16 SEL-751 Settings Sheets Date________________ of 78 Group Settings (SET Command) Loss-of-Potential Loss-of-Potential (Hidden if Slot Z = Ax) LOP BLOCK (SEL LOPBLK := OGIC Power Factor (Hidden if Slot Z = Ax) PF LAG TRIP LEVL (OFF, 0.05–0.99) 55LGTP := PF LD TRIP LEVEL (OFF, 0.05–0.99)
Page 389 Date _______________ SEL-751 Settings Sheets SET.17 Rate-of-Change of Frequency Group Settings (SET Command) of 78 Rate-of-Change of Frequency (Hidden if Slot Z = Ax) ENABLE 81R (N, 1–4) E81R := (The following rate-of-change-of-frequency settings are hidden if E81R := N) 81R VOLTAGE SUP (OFF, 12.5–300.0 V)
Page 390 SET.18 SEL-751 Settings Sheets Date________________ of 78 Group Settings (SET Command) Demand Metering Demand Metering ENABLE DEM MTR (THM, ROL) EDEM := DEM TIME CONSTNT (5, 10, 15, 30, 60 min) DMTC := PH CURR DEM LVL (OFF, 0.50–16.00 A {5 A nom}, 0.10–3.20 A {1 A nom}) PHDEMP := RES CURR DEM LVL (OFF, 0.50–16.00 A {5 A nom}, 0.10–3.20 A {1 A nom})
Page 391 Date _______________ SEL-751 Settings Sheets SET.19 Enables Logic Settings (SET L Command) of 78 OGIC RST TM FROM LO (0.00–3000.00 s) 79RSLD := RECLS SUPV TIME (OFF, 0.00–3000.00 s) (Forced to OFF if E79 := N) 79CLSD := RECLOSE INITIATE (SEL...
Page 392 SET.20 SEL-751 Settings Sheets Date________________ of 78 Logic Settings (SET L Command) Latch Bits Equations SET11 := RST11 := SET12 := RST12 := SET13 := RST13 := SET14 := RST14 := SET15 := RST15 := SET16 := RST16 := SET17 :=...
Page 393 Date _______________ SEL-751 Settings Sheets SET.21 SV/Timers Logic Settings (SET L Command) of 78 RST31 := SET32 := RST32 := SV/Timers SV TIMER PICKUP (0.00–3000.00 s) SV01PU := SV TIMER DROPOUT (0.00–3000.00 s) SV01DO := SV INPUT (SEL SV01 := OGIC SV TIMER PICKUP (0.00–3000.00 s)
Page 394 SET.22 SEL-751 Settings Sheets Date________________ of 78 Logic Settings (SET L Command) SV/Timers SV TIMER PICKUP (0.00–3000.00 s) SV11PU := SV TIMER DROPOUT (0.00–3000.00 s) SV11DO := SV INPUT (SEL SV11 := OGIC SV TIMER PICKUP (0.00–3000.00 s) SV12PU := SV TIMER DROPOUT (0.00–3000.00 s)
Page 395 Date _______________ SEL-751 Settings Sheets SET.23 Counters Equations Logic Settings (SET L Command) of 78 SV TIMER PICKUP (0.00–3000.00 s) SV23PU := SV TIMER DROPOUT (0.00–3000.00 s) SV23DO := SV INPUT (SEL SV23 := OGIC SV TIMER PICKUP (0.00–3000.00 s) SV24PU := SV TIMER DROPOUT (0.00–3000.00 s)
Page 396 SET.24 SEL-751 Settings Sheets Date________________ of 78 Logic Settings (SET L Command) Counters Equations SC PRESET VALUE (1–65000) SC02PV := SC RESET INPUT (SEL SC02R := OGIC SC LOAD PV INPUT (SEL SC02LD := OGIC SC CNT UP INPUT (SEL...
Page 397 Date _______________ SEL-751 Settings Sheets SET.25 Counters Equations Logic Settings (SET L Command) of 78 SC PRESET VALUE (1–65000) SC09PV := SC RESET INPUT (SEL SC09R := OGIC SC LOAD PV INPUT (SEL SC09LD := OGIC SC CNT UP INPUT (SEL...
Page 398 SET.26 SEL-751 Settings Sheets Date________________ of 78 Logic Settings (SET L Command) Counters Equations SC PRESET VALUE (1–65000) SC16PV := SC RESET INPUT (SEL SC16R := OGIC SC LOAD PV INPUT (SEL SC16LD := OGIC SC CNT UP INPUT (SEL...
Page 399 Date _______________ SEL-751 Settings Sheets SET.27 Counters Equations Logic Settings (SET L Command) of 78 SC PRESET VALUE (1–65000) SC23PV := SC RESET INPUT (SEL SC23R := OGIC SC LOAD PV INPUT (SEL SC23LD := OGIC SC CNT UP INPUT (SEL...
Page 400 SET.28 SEL-751 Settings Sheets Date________________ of 78 Logic Settings (SET L Command) Math Variables SC PRESET VALUE (1–65000) SC30PV := SC RESET INPUT (SEL SC30R := OGIC SC LOAD PV INPUT (SEL SC30LD := OGIC SC CNT UP INPUT (SEL...
Page 401 Date _______________ SEL-751 Settings Sheets SET.29 Base Output Logic Settings (SET L Command) of 78 MV24 := MV25 := MV26 := MV27 := MV28 := MV29 := MV30 := MV31 := MV32 := Base Output OUT101 FAIL-SAFE (Y, N) OUT101FS :=...
Page 402 SET.30 SEL-751 Settings Sheets Date________________ of 78 Logic Settings (SET L Command) Slot D Output Slot D Output Hidden if an output option is not included. The number of outputs depends on the I/O card option. OUT401 FAIL-SAFE (Y, N)
Page 403 Date _______________ SEL-751 Settings Sheets SET.31 Transmit SEL Control Equations Global Settings (SET G Command) of 78 IRRORED OGIC OUT507 FAIL-SAFE (Y, N) OUT507FS := OUT507 := OUT508 FAIL-SAFE (Y, N) OUT508FS := OUT508 := Transmit SEL Control Equations IRRORED...
Page 404 SET.32 SEL-751 Settings Sheets Date________________ of 78 Global Settings (SET G Command) Event Messenger Points MESSENGER POINT MP02 TRIGGER (OFF, 1 Relay Word bit) MPTR02 := MESSENGER POINT MP02 AQ (None, 1 analog quantity) MPAQ02 := MESSENGER POINT MP02 TEXT (148 characters)
Page 405 Date _______________ SEL-751 Settings Sheets SET.33 Event Messenger Points Global Settings (SET G Command) of 78 MESSENGER POINT MP14 TRIGGER (OFF, 1 Relay Word bit) MPTR14 := MESSENGER POINT MP14 AQ (None, 1 analog quantity) MPAQ14 := MESSENGER POINT MP14 TEXT (148 characters)
Page 406 SET.34 SEL-751 Settings Sheets Date________________ of 78 Global Settings (SET G Command) Group Selection MESSENGER POINT MP26 TRIGGER (OFF, 1 Relay Word bit) MPTR26 := MESSENGER POINT MP26 AQ (None, 1 analog quantity) MPAQ26 := MESSENGER POINT MP26 TEXT (148 characters)
Page 407 Date _______________ SEL-751 Settings Sheets SET.35 LEA Vsync Voltage Global Settings (SET G Command) of 78 LEA Vsync Voltage (The following LEA Vsync voltage settings are shown if Slot E := L0) VS RATIO CORRECT (0.500–1.500) VSRCF := VS ANGLE CORRECT (-10.0 to 10.0 deg)
Page 408 SET.36 SEL-751 Settings Sheets Date________________ of 78 Global Settings (SET G Command) Breaker Failure Breaker Failure 52A INTERLOCK (Y, N) 52ABF := CURRENT DETECTOR (0.10–10.00 A {5 A nom}, 0.02–2.00 A {1 A nom}) 50BFP :=  BK FAILURE DELAY (0.00–2.00 s) (When ATD OFF, BFD should be <ATD)
Page 409 Date _______________ SEL-751 Settings Sheets SET.37 Analog Inputs/Outputs Global Settings (SET G Command) of 78 Analog Inputs/Outputs For the following settings, x is the card position (3, 4, or 5 in Slot C, D, and E, respectively). Settings are hidden if Analog I/O are not included.
Page 410 SET.38 SEL-751 Settings Sheets Date________________ of 78 Global Settings (SET G Command) Analog Inputs/Outputs AIx03 AIx03 TAG NAME (8 characters 0–9, A–Z, _) AIx03NAM := AIx03 TYPE (I, V) AIx03TYP := If AIx03TYP := I AIx03 LOW IN VAL (–20.480 to +20.480 mA) AIx03L := AIx03 HI IN VAL (–20.480 to +20.480 mA)
Page 411 Date _______________ SEL-751 Settings Sheets SET.39 Analog Inputs/Outputs Global Settings (SET G Command) of 78 AIx05 AIx05 TAG NAME (8 characters 0–9, A–Z, _) AIx05NAM := AIx05 TYPE (I, V) AIx05TYP := If AIx05TYP := I AIx05 LOW IN VAL (–20.480 to +20.480 mA) AIx05L := AIx05 HI IN VAL (–20.480 to +20.480 mA)
Page 412 SET.40 SEL-751 Settings Sheets Date________________ of 78 Global Settings (SET G Command) Analog Inputs/Outputs AIx07 AIx07 TAG NAME (8 characters 0–9, A–Z, _) AIx07NAM := AIx07 TYPE (I, V) AIx07TYP := If AIx07TYP := I AIx07 LOW IN VAL (–20.480 to +20.480 mA) AIx07L := AIx07 HI IN VAL (–20.480 to +20.480 mA)
Page 413 Date _______________ SEL-751 Settings Sheets SET.41 Analog Inputs/Outputs Global Settings (SET G Command) of 78 AOx01 AOx01 ANALOG QTY (Off, 1 analog quantity) AOx01AQ := AOx01 TYPE (I, V) AOx01TYP := AOx01 AQTY LOW (–2147483647 to +2147483647) 01AQL := AOx01 AQTY HI (–2147483647 to +2147483647)
Page 414 SET.42 SEL-751 Settings Sheets Date________________ of 78 Global Settings (SET G Command) Station DC Battery Monitor AOx04 AOx04 ANALOG QTY (Off, 1 analog quantity) AOx04AQ := AOx04 TYPE (I, V) AOx04TYP := AOx04 AQTY LOW (–2147483647 to +2147483647) 04AQL := AOx04 AQTY HI (–2147483647 to +2147483647)
Page 415 Date _______________ SEL-751 Settings Sheets SET.43 Input Debounce (Slot E) Global Settings (SET G Command) of 78 Input Debounce (Slot E) (Hidden if an input option is not included) (AC, 0–65000 ms) IN508 Debounce IN508D := IN501 Debounce IN501D :=...
Page 416 SET.44 SEL-751 Settings Sheets Date________________ of 78 SET PORT p (p = F, 1, 2, 3, or 4) Command Control Configuration DISC 2 N/C CONT (SEL 89B2P2 := OGIC DISC 2 ALM PU (0.00–300.00 sec) 89A2P2D := DISC 3 N/O CONT (SEL...
Page 417 Date _______________ SEL-751 Settings Sheets SET.45 PORT 1 SET PORT p (p = F, 1, 2, 3, or 4) Command of 78 SUBNET MASK (zzz.yyy.xxx.www) SUBNETM := DEFAULT ROUTER (zzz.yyy.xxx.www) Note: Setting DEFRTR = 0.0.0.0 disables the default router. DEFRTR :=...
Page 418 SET.46 SEL-751 Settings Sheets Date________________ of 78 SET PORT p (p = F, 1, 2, 3, or 4) Command PORT 1 MODBUS TCP PORT 1 (1–65534) (Hidden if EMOD := 0) See Table SET.1 and the note at the end of Port 1 settings.
Page 419 Date _______________ SEL-751 Settings Sheets SET.47 PORT 1 SET PORT p (p = F, 1, 2, 3, or 4) Command of 78 UDP Response Port (REQ, 1–65534) DNPUDP1 := DNP Address to Report to (0–65519) REPADR1 := DNP Map (1–3) DNPMAP1 := Analog Input Default Variation (1–6)
Page 420 SET.48 SEL-751 Settings Sheets Date________________ of 78 SET PORT p (p = F, 1, 2, 3, or 4) Command PORT 1 Misc Data Reporting Dead-band Counts (0–32767) (Hidden if ECLASSA2 := 0 and ECLASSC2 := 0) ANADBM2 := Minutes for Request Interval (I, M, 1–32767) TIMERQ2 := Seconds to Select/Operate Time-Out (0.0–30.0)
Page 421 Date _______________ SEL-751 Settings Sheets SET.49 PORT 1 SET PORT p (p = F, 1, 2, 3, or 4) Command of 78 Session 4 (All Session 4 settings are hidden if EDNP < 4) DNP Master IP Address {zzz.yyy.xxx.www} (15 characters)
Page 422 SET.50 SEL-751 Settings Sheets Date________________ of 78 SET PORT p (p = F, 1, 2, 3, or 4) Command PORT 1 Misc Data Scaling Decimal Places (0–3) DECPLM5 := Amps Reporting Dead-band Counts (0–32767) (Hidden if ECLASSA5 := 0) ANADBA5 := Volts Reporting Dead-band Counts (0–32767) (Hidden if ECLASSA5 := 0)
Page 423: Table Set.5 Port Number Settings That Must Be Unique
PORT 2 (All of the following Port 2 settings are hidden if the relay is ordered without the Port 2 option. See the SEL-751 MOT for details.) (Fiber-Optic Serial Port in Slot B; the following setting are autoset and hidden if E49RTD := EXT)
Page 424 SET.52 SEL-751 Settings Sheets Date________________ of 78 SET PORT p (p = F, 1, 2, 3, or 4) Command PORT 2 DNP Map (1–3) DNPMAP1 := Analog Input Default Variation (1–6) DVARAI1 := Class for Binary Event Data (0–3) ECLASSB1 := Class for Counter Event Data (0–3)
Page 425 Date _______________ SEL-751 Settings Sheets SET.53 PORT 3 SET PORT p (p = F, 1, 2, 3, or 4) Command of 78 RMB8 Pickup Debounce Messages (1–8) RMB8PU := RMB8 Dropout Debounce Messages (1–8) RMB8DO := IEC 60870-5-103 Protocol (Hidden unless serial port with PROTO := 103) 103 DEVICE ADDRESS (0–254)
Page 426 SET.54 SEL-751 Settings Sheets Date________________ of 78 SET PORT p (p = F, 1, 2, 3, or 4) Command PORT 3 Modbus MODBUS SLAVE ID (1–247) (Hidden if PROTO := SEL, EVMSG, or MB_) SLAVEID := DNP3 Protocol (Hidden if PROTO := SEL, EVMSG, MB_, PMU, or MOD.) DNP Address (0–65519)
Page 427 Date _______________ SEL-751 Settings Sheets SET.55 PORT 4 SET PORT p (p = F, 1, 2, 3, or 4) Command of 78 Protocol IRRORED (Hidden if PROTO := SEL, EVMSG, or MOD) RMB4 Pickup Debounce MB Transmit Identifier Messages (1–8)
Page 428 SET.56 SEL-751 Settings Sheets Date________________ of 78 SET PORT p (p = F, 1, 2, 3, or 4) Command PORT 4 Communications SPEED (300–38400 bps) (Hidden if PROTO := DNET) SPEED := DATA BITS (7, 8 bits) (Hidden if PROTO := DNP, MOD, PMU, EVMSG, MB_, 103, or...
Page 429 Date _______________ SEL-751 Settings Sheets SET.57 PORT 4 SET PORT p (p = F, 1, 2, 3, or 4) Command of 78 Seconds to Data Link Time-Out (0–5) (Hidden if DRETRY1 := 0) DTIMEO1 := Event Message Confirm Time-Out (1–50 s)
Page 430 SET.58 SEL-751 Settings Sheets Date________________ of 78 Front-Panel Settings (SET F Command) General RMB8 Pickup Debounce Messages (1–8) RMB8PU := RMB8 Dropout Debounce Messages (1–8) RMB8DO := IEC 60870-5-103 Protocol (Hidden unless serial port with PROTO := 103) 103 DEVICE ADDRESS (0–254) 103ADDR := CYCLIC DATA REPORTING PERIOD (1–3600 s)
Page 431 Date _______________ SEL-751 Settings Sheets SET.59 Operator Control LED Front-Panel Settings (SET F Command) of 78 TARGET T_LED ASSERTED COLOR (R, G, A) T04LEDC := LED4 EQUATION (SEL T04_LED := OGIC TRIP LATCH T_LED (Y, N) T05LEDL := TARGET T_LED ASSERTED COLOR (R, G, A)
Page 432 SET.60 SEL-751 Settings Sheets Date________________ of 78 Front-Panel Settings (SET F Command) Display Points PB_LED ASSERTED/DEASSERTED COLORS (AG, AO, AR, GA, GO, GR, OA, OG, OR, RA, RG, RO) PB6BLEDC := PB6B_LED EQUATION (SEL PB6B_LED := OGIC PB_LED ASSERTED/DEASSERTED COLORS...
Page 433 Date _______________ SEL-751 Settings Sheets SET.61 Local Bits Labels Front-Panel Settings (SET F Command) of 78 DP25 := DP26 := DP27 := DP28 := DP29 := DP30 := DP31 := DP32 := Local Bits Labels LB_NAME (14 characters); CLEAR LB_ LABEL, SET LB_ LABEL, and PULSE LB_ LABEL (7 characters)
Page 434 SET.62 SEL-751 Settings Sheets Date________________ of 78 Front-Panel Settings (SET F Command) Local Bits Labels CLEAR LB_ LABEL CLB24 := LB_NAME NLB15 := SET LB_ LABEL SLB24 := CLEAR LB_ LABEL CLB15 := PULSE LB_ LABEL PLB24 := SET LB_ LABEL...
Page 435 Date _______________ SEL-751 Settings Sheets SET.63 Touchscreen Configuration Touchscreen Settings of 78 Touchscreen Settings (Shown if the front-panel MOT option is A) (Note: The Touchscreen settings category is only available in QuickSet, with the exception of the settings FPTO, FPDUR, and FPBAB, which are also available to set via the touchscreen display.)
Page 436 SET.64 SEL-751 Settings Sheets Date________________ of 78 Touchscreen Settings Bay Control Breaker Bay Control Breaker BREAKER TRIP TYPE (3) BK01TTY := BREAKER MODE (CONTROL, MONITOR) BK01MOD := BREAKER CLOSE STATUS (Relay Word bit) BK01CS := BREAKER OPEN STATUS (Relay Word bit)
Page 437 Date _______________ SEL-751 Settings Sheets SET.65 Digital Label Touchscreen Settings of 78 ANALOG QUANTITY ALAB10 := ANALOG QUANTITY ALAB11 := ANALOG QUANTITY ALAB12 := ANALOG QUANTITY ALAB13 := ANALOG QUANTITY ALAB14 := ANALOG QUANTITY ALAB15 := ANALOG QUANTITY ALAB16 :=...
Page 438 SET.66 SEL-751 Settings Sheets Date________________ of 78 Report Settings (SET R Command) SER Chatter Criteria RELAY WORD BIT DLAB17 := RELAY WORD BIT DLAB18 := RELAY WORD BIT DLAB19 := RELAY WORD BIT DLAB20 := RELAY WORD BIT DLAB21 :=...
Page 439 Date _______________ SEL-751 Settings Sheets SET.67 Event Report Report Settings (SET R Command) of 78 ALIAS8 ALIAS8 := ALIAS 9 ALIAS9 := ALIAS10 ALIAS10 := ALIAS11 ALIAS11 := ALIAS12 ALIAS12 := ALIAS13 ALIAS13 := ALIAS14 ALIAS14 := ALIAS15 ALIAS15 :=...
Page 440 SET.68 SEL-751 Settings Sheets Date________________ of 78 Modbus Map Settings (SET M Command) Fast Message Remote Analog Settings Fast Message Remote Analog Settings Remote Analog Value Type (I, F, L), I = Integer, F = Float, L = Long RA17TYPE :=...
Page 441 Date _______________ SEL-751 Settings Sheets SET.69 Modbus User Map Modbus Map Settings (SET M Command) of 78 MOD_027 := MOD_068 := MOD_028 := MOD_069 := MOD_029 := MOD_070 := MOD_030 := MOD_071 := MOD_031 := MOD_072 := MOD_032 := MOD_073 :=...
Page 442 SET.70 SEL-751 Settings Sheets Date________________ of 78 DNP3 Map Settings (SET DNP n Command) Binary Input Map MOD_109 := MOD_110 := MOD_111 := MOD_112 := MOD_113 := MOD_114 := MOD_115 := MOD_116 := MOD_117 := MOD_118 := MOD_119 := MOD_120 :=...
Page 443 Date _______________ SEL-751 Settings Sheets SET.71 Binary Input Map DNP3 Map Settings (SET DNP n Command) of 78 BI_34 := BI_75 := BI_35 := BI_76 := BI_36 := BI_77 := BI_37 := BI_78 := BI_38 := BI_79 := BI_39 :=...
Page 444 SET.72 SEL-751 Settings Sheets Date________________ of 78 DNP3 Map Settings (SET DNP n Command) Binary Output Map Binary Output Map DNP Binary Output Label Name (10 characters) BO_16 := BO_00 := BO_17 := BO_01 := BO_18 := BO_02 := BO_19 :=...
Page 445 Date _______________ SEL-751 Settings Sheets SET.73 Analog Input Map DNP3 Map Settings (SET DNP n Command) of 78 AI_39 := AI_80 := AI_40 := AI_81 := AI_41 := AI_82 := AI_42 := AI_83 := AI_43 := AI_84 := AI_44 :=...
Page 446 SET.74 SEL-751 Settings Sheets Date________________ of 78 DNP3 Map Settings (SET DNP n Command) Analog Output Map Analog Output Map DNP Analog Output Label Name (6 characters) AO_16 := AO_00 := AO_17 := AO_01 := AO_18 := AO_02 := AO_19 :=...
Page 447 Date _______________ SEL-751 Settings Sheets SET.75 Binary Input Map IEC 60870-5-103 Map Settings (SET I Command) of 78 IEC 60870-5-103 Map Settings (SET I Command) (Hidden if the IEC 60870-5-103 option is not included) Use the SET I command to input the map required for the IEC 60870-5-103 protocol.
Page 448 SET.76 SEL-751 Settings Sheets Date________________ of 78 IEC 60870-5-103 Map Settings (SET I Command) Binary Target Map 103BI72 := 103BI73 := 103BI74 := 103BI75 := 103BI76 := 103BI77 := 103BI78 := 103BI79 := 103BI80 := 103BI81 := 103BI82 := 103BI83 :=...
Page 449 Date _______________ SEL-751 Settings Sheets SET.77 Binary Control Map IEC 60870-5-103 Map Settings (SET I Command) of 78 103FA08 := 103FA09 := 103FA10 := 103FA11 := 103FA12 := 103FA13 := 103FA14 := 103FA15 := 103FA16 := 103FA17 := 103FA18 :=...
Page 450 SET.78 SEL-751 Settings Sheets Date________________ of 78 IEC 60870-5-103 Map Settings (SET I Command) Measurand Map 103BO30 := 103BO31 := Measurand Map 3MLB026 := 3MLB000 := 3MLB027 := 3MLB001 := 3MLB028 := 3MLB002 := 3MLB029 := 3MLB003 := 3MLB030 :=...
Page 451: Table 7.1 Sel-751 Communications Port Interfaces
Communications Interfaces The SEL-751 physical interfaces are shown in Table 7.1. Several optional SEL devices are available to provide alternative physical interfaces, including EIA-485, EIA-232 fiber-optic serial port, copper or fiber Ethernet port, single or dual redundant.
Page 452 ➤ Terminal emulation software to control the computer serial port ➤ An SEL-751 Relay Some of the SEL devices available for integration or communications system robustness are included in the following list: ➤ SEL communications processors (SEL-2032, SEL-2030,...
Page 453: Figure 7.1 Simple Ethernet Network Configuration
Ethernet Port Use the Ethernet port for interfacing with an Ethernet network environment. SEL-751 Ethernet port choices include single or dual copper or fiber-optic configurations. With dual Ethernet ports, the unit has an unmanaged Ethernet switch. Redundant configurations support automatic failover switching from the primary to the backup network if the relay detects a failure in the primary network.
Page 454: Figure 7.2 Ethernet Network Configuration With Dual Redundant Connections (Failover Mode)
(Switched Mode) Dual Network Port Operation The SEL-751 dual Ethernet port option has two network ports. Network port failover mode enables the dual Ethernet port to operate as a single network adapter with a primary and standby physical interface. You can connect the two network ports to the same network or to different networks depending on your specific Ethernet network architecture.
Page 455 On startup, the relay communicates via NETPORT (primary port) selected. If NOTE: If you change settings for the the SEL-751 detects a link failure on the primary port, it activates the standby host port in the relay and the standby network port is active, the relay port after the failover time, FTIME, elapses.
Page 456: Table 7.2 Prp Settings
IRIG-B The SEL-751 has three different physical interfaces, depending on the model options, to provide demodulated IRIG-B time-code input for time synchronization. If the relay has multiple options for IRIG-B input, you can use only one input at a time.
Page 457: Figure 7.5 Irig-B Input Via Eia-232 Port 3 (Sel Communications Processor As Source)
You cannot use B01–B02 input or Port 3 input if you use Port 2 for IRIG-B input. Set Global setting IRIG TIME SOURCE to TIME_SRC := IRIG2. Figure 7.7 IRIG-B Input Via Fiber-Optic EIA-232 Port 2 (SEL-2030/2032 Time Source) Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 458: Table 7.3 Eia-232/Eia-485 Serial Port Pin Functions
This +5 Vdc power is available on Pin 1 only on EIA-232 Port 3 and EIA-232 Port 4. Connect Your The front port of the SEL-751 is a standard female 9-pin connector with pin numbering shown in Figure 7.9. The pinout assignments for this port are PC to the Relay shown in Table 7.3.
Page 459: Figure 7.10 Sel Cable C234A-Sel-751 To Dte Device
For EIA-485, the pin numbers represent relay terminals _O1 through _05. The following cable diagrams show several types of EIA-232 serial communications cables that connect the SEL-751 to other devices. These and other cables are available from SEL. Contact the factory for more information.
Page 460: Figure 7.12 Sel Cable C222-Sel-751 To Modem
9-Pin Male 9-Pin Male D Subconnector D Subconnector Func. Pin # Pin # Func. Figure 7.13 SEL Cable C272A—SEL-751 to SEL Communications Processor Without IRIG-B Signal SEL Communications Processor SEL-751 Relay 9-Pin Male 9-Pin Male D Subconnector D Subconnector Pin # Pin # Func.
Page 461: Table 7.4 Protocols Supported On The Various Ports
Communications Protocols Communications Protocols Although the SEL-751 supports a wide range of protocols, not all protocols are available on all ports. In addition, not all hardware options support all protocols. Be sure to select the correct hardware to support a particular protocol. For example, if Modbus TCP is necessary for your application, be sure to order the Ethernet option for PORT 1.
Page 462 The SEL-751 provides Modbus RTU support. Modbus is an optional protocol described in Appendix E: Modbus RTU Communications. DNP3 (Distributed Network Protocol) The SEL-751 provides DNP3 protocol support if the option is selected. The DNP3 protocol is described in Appendix D: DNP3 Communications. DeviceNet Protocol The SEL-751 provides DeviceNet support.
Page 463 File Transfer Protocol (FTP) and MMS File Transfer FTP is a standard protocol for exchanging files between computers over a TCP/IP network. The SEL-751 operates as an FTP server, presenting files to FTP clients. To create an FTP session, you need the FTP username and password.
Page 464 Serve NTP Via the SEL-3530 RTAC ➤ AN2009-38: Using SEL Satellite-Synchronized Clocks With the SEL-3332 or SEL-3351 to Output NTP ➤ AN2010-03: Using an SEL-2401, SEL-2404, or SEL-2407 to Create a Stratum 1 Linux NTP Server SEL-751 Relay Instruction Manual Date Code 20170927...
Page 465: Table 7.5 Settings Associated With Sntp
NTP server broadcasts from that address. When synchronized, the relay asserts Relay Word bit TSNTPP. Relay Word bit TNSTPP deasserts if the relay does not receive a valid broadcast within five seconds after the period defined by setting SNTPRATE. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 466: Figure
You can achieve the highest degree of SNTP time synchronization by minimizing the number of switches and routers between the SNTP server and the SEL-751. You can also use network monitoring software to ensure that average and worst-case network bandwidth use is moderate.
Page 467: Table 7.6 Serial Port Automatic Messages
(Relay Self-Test Status) on page 7.51. Access Levels You can issue commands to the SEL-751 via the serial port or Telnet session to view metering values, change relay settings, etc. The available serial port commands are listed in the SEL-751 Relay Command Summary at the end of this manual.
Page 468 Commands (ACCESS, 2ACCESS, and CAL) on page 7.20 for more detail. Access Level 1 When the SEL-751 is in Access Level 1, the relay sends the following prompt: => See the SEL-751 Relay Command Summary at the end of this manual for the commands available from Access Level 1.
Page 469: Table 7.7 Command Response Header Definitions
7.19 Communications Protocols Command Summary The SEL-751 Relay Command Summary at the end of this manual lists the serial port commands alphabetically. Much of the information available from the serial port commands is also available via the front-panel pushbuttons. Access Level Functions...
Page 470: Table 7.8 Access Commands
The ACC, 2AC, and CAL commands (see Table 7.8) provide entry to the multiple access levels. Different commands are available at the different access levels, as shown in the SEL-751 Relay Command Summary at the end of this manual. Commands ACC and 2AC are explained together because they operate similarly.
Page 471 You can get to Access Level C from Access Level 2 with the CAL command. The relay pulses the SALARM Relay Word bit for one second after a successful Level 2 or Level C access, or if access is denied. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 472: Figure 7.16 Aft Command Response
You can test the analog output in one of the following two modes: ➤ Fixed percentage: Outputs a fixed percentage of the signal for a specified duration ➤ Ramp: Ramps the output from minimum to maximum of full scale during the time specified SEL-751 Relay Instruction Manual Date Code 20170927...
Page 473: Table 7.9 Analog Command
75 percent of rating for 5.5 minutes. To check the device output, calculate the expected mA output as follows:    Output 20.00 mA 4.00 mA 4.00 mA 16.00 mA – -------- - Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 474: Figure 7.17 Breaker Monitor Report
If you make a data entry error while using the BRE W (Y/N)? command, the values echoed after the Invalid format, changes not message are the previous BRE values, unchanged by the aborted saved BRE W attempt. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 475: Figure 7.18 Breaker Wear Report
See Breaker Monitor on page 5.19 for further details on the breaker monitor. CEV Command The SEL-751 provides Compressed ASCII event reports to facilitate event report storage and display. SEL communications processors and the Analytic Assistant SEL-5601 Software take advantage of the ERATOR Compressed ASCII format.
Page 476: Figure 7.20 Cev Hif Command Response
Communications Protocols for all conditions listed in the SUM HIF command. When an event report is triggered for any of these conditions, the SEL-751 asserts Relay Word bit HIFREC, which stays asserted until the HIF event report has finished collecting. The relay does not generate additional event reports for triggering conditions that follow the initial triggering condition and are within the same report.
Page 477: Table
For more information on IRRORED communications, see Appendix J: M IRRORED IRRORED Communications. The summary report includes information on the status of Relay Word bits ROKA and ROKB that indicates if received data are valid. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 478: Table 7.10 Com Command
Table 7.11 CONTROL Command Command Description Access Level CON RB nn k Sets a remote bit to set, clear, or pulse. Parameters a number from 01 to 32, representing RB01 through RB32. S, C, or P SEL-751 Relay Instruction Manual Date Code 20170927...
Page 479: Table 7.12 Three Remote Bit States
IRIG. Enter the DATE command with a date to set the internal clock date. Table 7.15 Date Command Command Description Access Level DATE Displays the internal clock date. DATE mm/dd/yyyy, Sets the internal clock date yyyy/mm/dd, or (DATE_F set to MDY, YMD, or DMY). dd/mm/yyyy Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 480: Figure 7.21 Ethernet Port (Port 1) Status Report When Netmode := Prp
IP ADDRESS: 10.10.52.221 SUBNET MASK: 255.255.255.0 DEFAULT GATEWAY: 10.10.52.1 PACKETS BYTES ERRORS SENT RCVD SENT RCVD SENT RCVD 14652 7861 =>> Figure 7.22 Ethernet Port (PORT 1) Status Report When NETMODE := FIXED SEL-751 Relay Instruction Manual Date Code 20170927...
Page 481: Figure 7.23 Ethernet Port (Port 1) Status Report When Netmode := Failover, E61850 := Y, And Egse := Y
RCVD SENT RCVD 8537 5096 =>> Figure 7.24 Ethernet Port (PORT 1) Status Report When NETMODE := SWITCHED The command response for the single Ethernet port option is as shown in Figure 7.25. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 482: Table 7.16 Event Command (Event Reports)
FIL READ filename Transfers settings file filename from the relay to the PC. FIL WRITE filename Transfers settings file filename from the PC to the relay. FIL SHOW filename Displays contents of the file filename. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 483: Table 7.18 Goose Command Variants
(Sequence Number) This hexadecimal field represents the sequence number that increments with each retransmitted GOOSE message sent. (Time to Live) This field contains the time (in ms) before the next message is expected. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 484 Calculated number of mes- This represents the total of all estimated number of messages lost due to state or sequence num- sages lost due to OOS ber skip in received messages. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 485: Figure 7.26 Goose Command Response
2075069 2000 Data Set: SEL_700G_1CFG/LLN0$GPDSet01 SEL_710d5_1CFG/LLN0$GO$GPub01 01-0C-CD-01-00-18 4120 2075091 2000 Data Set: SEL_710d5_1CFG/LLN0$GPDSet01 SEL_710_1CFG/LLN0$GO$GooseDSet13 01-0C-CD-01-00-08 4104 2030049 2000 Data Set: SEL_710_1CFG/LLN0$DSet13 SEL_710_2CFG/LLN0$GO$GPub01 01-0C-CD-01-00-13 2075484 2000 Data Set: SEL_710_2CFG/LLN0$GPDSet01 Figure 7.26 GOOSE Command Response Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 486: Table 7.19 Group Command
Table 7.20 HELP Command Command Description Access Level HELP Displays a list of each command available at the present access level with a one-line description. HELP command Displays information on the command command. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 487: Table 7.21 History Command
The relay prompts, when you Clear all event reports. Are you sure (Y/N)? issue the HIS C and HIS R commands. If you answer , the relay Y <Enter> clears all HIF event reports. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 488: Table 7.23 Hsg Command
Communications Communications Protocols HSG Command When the SEL-751 is ordered with the Arc Sense technology (AST) option for the high-impedance fault (HIF) detection, the relay provides high-impedance fault histogram data with the HSG (histogram) command. The HSG command displays 100 long-term and 100 short-term histogram counter values of the Phases A, B, and C current odd-harmonic content (ISM) plus the learned limits for the histograms.
Page 489: Table 7.24 Identification Command
Date: 12/10/2010 Time: 08:56:03.190 FEEDER RELAY Time Source: external => If no IRIG-B code is present at the serial port input or if the code cannot be read successfully, the relay responds with IRIG-B DATA ERROR Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 490: Table 7.27 Ldp Commands
Downloads firmware to the control. LOG HIF (High-Impedance Fault) Command When the SEL-751 is ordered with the Arc Sense technology (AST) option for the high-impedance fault detection, the relay provides high-impedance fault detection progress data with the LOG HIF (LOG H command) report.
Page 491: Table 7.29 Log Hif Command
ROK is deasserted. IRRORED The LOO command tells the M software to temporarily expect IRRORED to see its own data looped back as its input. In this mode, LBOK asserts if Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 492: Table 7.31 Meter Command
Access Level MET c n Displays metering data. MET c R Resets metering data. Parameters Parameter for identifying meter class. Parameter used to specify number of times (1–32767) to repeat the meter response. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 493: Table 7.32 Meter Class
If the Breaker jumper is not in place (Breaker jumper = OFF), the relay does not execute the OPE command and responds with the following. =>>OPE <Enter> Command Aborted: No Breaker Jumper =>> Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 494: Table 7.33 Password Command
Special ! " # $ % & ' ( ) * + , - . / : ; < = > ? @ [ \ ] ^ _ ` { | } ~ SEL-751 Relay Instruction Manual Date Code 20170927...
Page 495: Figure 7.29 Ping Command Response
(a or b). The PUL command ENABLED position. energizes the coil and has no effect if the coil is already energized. The control outputs are OUTnnn, where nnn represents 101–103 (standard), 301–304 (optional), 401–404 (optional), or 501–504 (optional). Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 496: Table 7.36 Pul Outnnn Command
Access Level QUIT Goes to Access Level 0. Access Level 0 is the lowest access level; the SEL-751 performs no password check to descend to this level (or to remain at this level). R_S Command (Restore Factory Defaults) Use the R_S command (see Table 7.38) to restore factory-default settings.
Page 497: Table 7.39 Ser Command (Sequential Events Recorder Report)
SER elements (Report setting ESERDEL), the relay responds, Automatic removal of chattering SER elements not enabled SET Command (Change Settings) The SET command is for viewing or changing the relay settings (see Table 7.41). Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 498: Table 7.41 Set Command (Change Settings)
The relay is disabled for as long as one second while it saves the new settings. The SALARM Relay Word bit is set momentarily, and the ENABLED LED extinguishes while the relay is disabled. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 499: Table 7.43 Show Command (Show/View Settings)
Appends, s, the name of the specific setting you want to view, and jumps to this setting. If s is not entered, the relay starts at the first setting. =>>SHO <Enter> Group 1 Relay Settings ID Settings := SEL-751 := FEEDER RELAY Config Settings := 120 CTRN := 120 := 180.00...
Page 500 E59I4 := N SyncCheck Set := N LOP Setting LOPBLK := 0 Power Factor Set 55LGTP := OFF 55LDTP := OFF 55LGAP := OFF 55LDAP := OFF Figure 7.30 SHOW Command Example (Continued) SEL-751 Relay Instruction Manual Date Code 20170927...
Page 501: Table 7.44 Status Command (Relay Self-Test Status)
Serial Num Serial number Number Firmware identifier string Text Data Firmware checksum identifier PART NUM Part number Text Data FPGA FPGA programming unsuccessful, or FPGA OK/FAIL failed GPSB General purpose serial bus OK/FAIL Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 502: Figure 7.31 Typical Relay Output For Status S Command
In the example, Execution 84% GROUP 1 GROUP 2 GROUP 3 GROUP 4 means 84% of execution capacity is Execution (%) still available. Group (%) Logic (%) =>> Figure 7.31 Typical Relay Output for STATUS S Command SEL-751 Relay Instruction Manual Date Code 20170927...
Page 503: Table 7.47 Sum Hif Command
Shows Relay Word Row 0. TRIP condition is present. Parameter name Displays the Relay Word row with Relay Word bit name. Shows Relay Word row number n. Repeats k times (1–32767). Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 504: Table 7.49 Front-Panel Leds And The Tar 0 Command
Ensure that remote devices are properly configured to receive the overridden data before using the TEST DB command. To override analog data in a communications interface, enter the following from Access Level 2 or higher: =>>TEST DB A name value <Enter> SEL-751 Relay Instruction Manual Date Code 20170927...
Page 505 (overrides are already active), the relay responds: Override Added The TEST DB command alone displays the present status of digital and analog overrides. An example TEST DB response after two analogs follows: Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 506: Table 7.51 The Command (Preload Or Reset Thermal Capacity)
Figure 7.32 THE Command Example TIME Command (View/Change Time) The TIME command (see Table 7.52) returns information about the SEL-751 internal clock. You can also set the clock if you specify hours and minutes (seconds data are optional). Separate the hours, minutes, and seconds with colons, semicolons, spaces, commas, or slashes.
Page 507: Table 7.53 Trigger Command (Trigger Event Report)
If you enter an invalid time, the SEL-751 responds with Invalid Time TRIGGER Command (Trigger Event Report) Use the TRI command (see Table 7.53) to trigger the SEL-751 to record data for high-resolution oscillography and event reports. Table 7.53 TRIGGER Command (Trigger Event Report)
Page 508: Table 7.56 Ftp And Mms Virtual File Structure
(HMI_ALL.zip) Only available in FTP file structure. The COMTRADE directory is only available in MMS file structure. Available only in the SEL-751 touchscreen display model. Root Directory The root directory (/) contains files and subdirectories as shown in Table 7.56.
Page 509 There is a file for each instance of each setting class. Table 7.57 summarizes the settings files. The settings class is designated by c, and the settings instance number is designated by n. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 510: Table 7.57 Settings Directory Files
The relay provides history, event reports, and oscillography files in the EVENTS directory as shown in Table 7.59. Event reports are available in the following formats: ➤ SEL Compressed ASCII ➤ Binary COMTRADE format (IEEE C37.111-1999) SEL-751 Relay Instruction Manual Date Code 20170927...
Page 511: Table 7.59 Event Directory Files
Table 7.59 are used to create a high-impedance event report that conforms to the COMTRADE standard. The field, nnnnn, corresponds to the unique event identification number displayed by the HIS HIF command. For details on event reports see Section 10: Analyzing Events. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 512: Table 7.60 Files Available For Ymodem Protocol
CHISTORY_HIF.TXT See Reports Directory (Read-Only) on page 7.60 1, 2, C HISTORY.TXT See Reports Directory (Read-Only) on page 7.60 1, 2, C HISTORY_HIF.TXT See Reports Directory (Read-Only) on page 7.60 1, 2, C SEL-751 Relay Instruction Manual Date Code 20170927...
Page 513: Table 7.61 Ftp And Mms Wildcard Usage Examples
Lists all of the metering files (HIS- with xyz. HIS*.TXT TORY.TXT, HIF_HISTORY.TXT) abc* Lists all files whose FILE READ Retrieves all of the three files for name begins with abc. HR_10007* the COMTRADE event 10007 (HR_10007.CFG, HR_10007.DAT, and HR_10007.HDR) Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 514 This page intentionally left blank...
Page 515: Figure 8.1 Sel-751 Front-Panel Models
Use the front panel to analyze operating information, view and change relay settings, and perform control functions. You can order the SEL-751 in three different front-panel options, as shown in Table 1.4 and Figure 8.1. The display comes with a two-line display (2 x 16 characters) front panel and eight control pushbuttons.
Page 516: Figure 8.2 Front-Panel Overview
NOTE: If the relay part number Model With Four specifies the Spanish language option, Pushbuttons (PB05–PB08) all of the front-panel pushbuttons and LED labels will be in Spanish. i5379a Figure 8.2 Front-Panel Overview SEL-751 Relay Instruction Manual Date Code 20170927...
Page 517: Table 8.1 Front-Panel Automatic Messages (Fp_Auto := Override)
Front-Panel Operations Two-Line Display Front Panel You can use the following features of the versatile SEL-751 front-panel to NOTE: The reduced SEL-751 model customize it to your needs: with four pushbuttons does not support AUX 1 through AUX4 ➤ Rotating display on the HMI (i.e., PB05 through PB08).
Page 518: Figure 8.3 Access Level Security Padlock Symbol
Front-Panel Timeout To help prevent unauthorized access to password-protected functions, the SEL-751 provides a front-panel timeout, setting FP_TO. A timer resets every time you press a front-panel pushbutton. Once the timeout period expires, the access level resets to Access Level 1. Manually reset the access level by...
Page 519: Table 8.2 Front-Panel Pushbutton Functions
Two-Line Display Front Panel Front-Panel Menus and Screens Navigating the Menus The SEL-751 front panel gives you access to most of the information that the relay measures and stores. You can also use front-panel controls to view or modify relay settings.
Page 520: Figure 8.6 Main Menu
Display shown in Figure 8.8. METER Fundamental Thermal Demand (Energy Selected) Peak Demand Energy ENERGY Max/Min Display Reset Analog Inputs Math Variables Light Intensity Remote Analogs Figure 8.8 METER Menu and ENERGY Submenu SEL-751 Relay Instruction Manual Date Code 20170927...
Page 521: Figure 8.9 Relay Response When Energy (Or Max/Min, Demand, Peak Demand) Metering Is Reset
Display Clear MAIN (Events Selected) Meter EVENTS Events Display Targets Clear Control Set/Show Status Breaker Quit Figure 8.12 MAIN Menu and EVENTS Submenu Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 522: Figure 8.13 Events Menu And Display Submenu
Relay Word bits as shown in Table K.1. MAIN Meter Events (Targets Selected) Targets TARGETS Control Row 0=10000000 Set/Show Row 1=00000000 Status Row 2=00000000 Breaker Quit Figure 8.16 MAIN Menu and TARGETS Submenu SEL-751 Relay Instruction Manual Date Code 20170927...
Page 523: Figure 8.17 Targets Menu Navigation
CC bits from the front panel is blocked. When EN_LRC := N, breaker control from the front panel is always allowed. For the settings related to the local/ remote control function, refer to Local/Remote Breaker Control in Section 9: Bay Control. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 524: Figure 8.19 Control Menu And Outputs Submenu
Outputs CONTROL Figure 8.19 to test (pulse) SEL-751 output contacts and associated circuits. Choose the output contact by navigating through the menu, and test it OUTPUT by pressing the ENT pushbutton. Note that testing the output contact requires the breaker jumper to be enabled, Level 2 access, and reconfirmation.
Page 525: Figure 8.21 Main Menu And Set/Show Submenu
Up Arrow and Down Arrow pushbuttons to change the value. Press the ENT pushbutton to enter the new setting. You can also make settings changes by using QuickSet ERATOR SEL-5030 Software or ASCII SET commands via a communications port. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 526: Figure 8.22 Set/Show Menu
Command (Relay Self-Test Status) on page 7.51 for the STATUS data field description. MAIN Meter Events Targets Control (Status Selected) Set/Show STATUS Status Relay Status Breaker Quit Arc Flash Status Reboot Relay Figure 8.23 MAIN Menu and Status Submenu SEL-751 Relay Instruction Manual Date Code 20170927...
Page 527: Figure 8.24 Main Menu And Breaker Submenu
All of the HMI messages can be displayed in multiple languages (English or Spanish). The relay part number determines which language is displayed on the HMI. The HMI can display either ENGLISH or SPANISH. See the SEL-751 Relay Command Summary for a list of the commands. Operation and Target LEDs...
Page 528: Table 8.3 Possible Warning Conditions (Flashing Trip Led)
TARGET RESET Pushbutton Target Reset For a trip event, the SEL-751 latches the trip-involved target LEDs except for the ENABLED LED. Press the TARGET RESET pushbutton to reset the latched target LEDs. When a new trip event occurs and the previously latched trip targets have not been reset, the relay clears the latched targets and displays the new trip targets.
Page 529: Figure 8.26 Target Reset Pushbutton
RSTTRGT in Global Settings (SET G Command), Data Reset on page 4.187 for further information. Front-Panel Operator Control Pushbuttons The base SEL-751 features eight operator-controlled pushbuttons, each with two programmable tricolor pushbutton LEDs, for local control as shown in Figure 8.27.
Page 530: Table 8.4 Sel-751 Front-Panel Operator Control Functions
Use the slide-in label to mark the pushbuttons and pushbutton LEDs with custom names to reflect any programming changes that you make. Included on the SEL-751 Product Literature CD are word processor templates for printing slide-in labels. See the instructions included in the Configurable Label kit for more information on changing the slide-in labels.
Page 531 Option: Set a delay, so that the operator can press the CLOSE operator control pushbutton CLOSE and then move a safe distance away from the breaker before the SEL-751 issues a close BREAKER CLOSED (the CLOSE operator control comes with no set delay in the factory settings). With a set...
Page 532: Figure 8.28 Touchscreen Display Components And Indicators
Touchscreen Display Front Panel Touchscreen Display Front Panel The SEL-751 Feeder Protection Relay can be ordered with an optional touchscreen display (5-inch, color, 800 x 480 pixels). The touchscreen display makes relay data metering, monitoring, and control quick and efficient. The...
Page 533: Table 8.5 Touchscreen Display Component And Indicator Descriptions
Touchscreen application. Use the FPBAB setting to adjust the brightness of the display. The backlight of the display goes dark 60 minutes after the inactivity timer (1–30 min) expires. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 534: Table 8.6 Front-Panel Automatic Messages
Front-Panel Security Use the Access Level folder on the Home screen for login/logout operations. The SEL-751 front panel typically operates at Access Level 1 and allows you to view relay measurements and settings. Particular activities, such as editing settings and controlling output contacts, are restricted to those operators who know the Access Level 2 password.
Page 535: Table 8.7 Sidebar Buttons
You can navigate the touchscreen by tapping the folders and applications. Tap a folder or an application to view available applications or access an application, respectively. Folders and applications are labeled according to functionality. Figure 8.29 Home (Default FPHOME Setting) Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 536: Table 8.8 Home Folders And Applications
Meter screen are part number dependent. Only those metering applications specific to your part number appear on the Meter screen. Tapping an application on the Meter screen shows you the report for that particular application. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 537: Table 8.9 Meter Application Availability
Shown when HIF is supported, i.e., when the firmware option is 3, 5, or 8 Remote Analogs Always available Light Intensity Shown when Slot E = (70 or L0) or 77 Refer to the relay part number. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 538: Figure 8.32 Meter Phasors
Figure 8.36. Monitor the status of the Relay Word bits (targets), digital outputs, digital inputs, SEL counters, and breaker wear data using the OGIC respective applications (Relay Word Bits, Digital Outputs, Digital Inputs, Counters, and Breaker Wear). OGIC SEL-751 Relay Instruction Manual Date Code 20170927...
Page 539: Table 8.10 Monitor Application Availability
Relay Word bit. To search for a Relay Word bit, you must enter the full name of the Relay Word bit in the screen Search Relay Word Bit SEARCH field. Figure 8.39 and Figure 8.40 show typical Relay Word bits monitoring screens. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 540: Table 8.11 Reports Application Availability
Event History, HIF Event History, and Sequential Events Recorder screens and confirming the delete action removes the records from the relay. Figure 8.42 through Figure 8.44 show typical Event History, Event Summary, and Sequential Events Recorder screens. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 541: Figure 8.44 Sequential Events Recorder
Breaker Control and Output Pulsing applications require that the breaker jumper be installed on the main board. Refer to Password, Breaker Control, and SEL Jumper Selection on page 2.18 for information on the breaker BOOT jumper. Figure 8.45 Control Applications Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 542: Table 8.12 Control Application Availability
Figure 8.47. An output contact cannot be pulsed if it is already asserted. Pulsing the output contact requires that the breaker jumper be installed and that you have Level 2 access. Figure 8.47 Digital Output Pulsing—Slot A Figure 8.48 Digital Output Pulsing Confirmation SEL-751 Relay Instruction Manual Date Code 20170927...
Page 543: Figure 8.49 Local Bits
Tapping this folder navigates you to the Device Info screen where you can access specific device information applications (Status, Configuration, Arc-Flash Diagnostics, and Trip & Diag. Messages) and the Reboot application. Figure 8.52 Device Info Applications Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 544: Table 8.13 Device Info Application Availability
To view the trip and diagnostic messages, tap the Trip & Diag. Messages application in the Device Info folder. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 545: Figure 8.56 Trip And Diagnostic Messages
Figure 8.58 Arc-Flash Diagnostics Confirmation Access Level Tapping this folder navigates you to the Access Level screen where you can either log in to or log out of the 2AC level. Figure 8.59 Access Level Applications Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 546: Table 8.14 Access Level Application Availability
Tapping this folder navigates you to the Settings screen where you can access settings applications (Global, Touchscreen) or settings folders (Port, Group, Date and Time) through which you can set or show settings. Figure 8.62 Settings Folders and Applications SEL-751 Relay Instruction Manual Date Code 20170927...
Page 547: Table 8.15 Settings Folder And Application Availability
Always available Group Set 3 Always available Logic 3 Always available Set 4 Always available Logic 4 Always available Date Always available Date and Time Time Always available Refer to the relay part number. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 548: Figure 8.63 Port Settings
(e.g., Set 1 in Group Settings), you cannot navigate to another class (e.g., Logic 1) without saving or discarding the settings change made in Set 1. Figure 8.65 Set 1 Settings Figure 8.66 Max Phase Overcurrent Settings Figure 8.67 Set/Show Settings Edit SEL-751 Relay Instruction Manual Date Code 20170927...
Page 549: Figure 8.68 Touchscreen Settings
All of the HMI messages can be displayed in multiple languages (English or Spanish). The relay part number determines which language is displayed on the HMI. See the SEL-751 Relay Command Summary for a list of the commands. Operation and Target...
Page 550 TARGET RESET pushbutton, the lamp test, and other target reset options. Front-Panel Operator Control Pushbuttons The SEL-751 touchscreen display features eight operator-controlled pushbuttons, each with two programmable tricolor pushbutton LEDs, for local control, as shown in Table 8.4. Refer to Front-Panel Operator Control Pushbuttons on page 8.15 for details on operator control pushbuttons and...
Page 551 Shown when Slot Z = Ax INRMS Shown when (Slot Z  Ax AND RMS Screen 2 IARMS, IBRMS, ICRMS, INRMS, VABRMS, DELTA_Y = DELTA) AND (Slot E  70 or L0) VBCRMS, VCARMS Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 552 KWADO, KWBDO, KWCDO, DELTA_Y = WYE DM_LRD Shown when Slot Z  Ax AND Demand Screen 4 KVARADI, KVARBDI, KVARCDI, KVARADO, DELTA_Y = WYE KVARBDO, KVARCDO, DM_LRD Demand Reset Screen Reset demand data Always available SEL-751 Relay Instruction Manual Date Code 20170927...
Page 553 Alarm, ALG.2C Fault Remote Analogs Remote Analogs Screen 1 RA001–RA012 Always available Remote Analogs Screen 2 RA013–RA024 Always available Remote Analogs Screen 3 RA025–RA036 Always available Remote Analogs Screen 4 RA037–RA048 Always available Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 554 IN413, IN414 Digital Inputs Screen 10 IN501, IN502, IN503, IN504 Shown when Slot E = Dx or 1x or Cx Digital Inputs Screen 11 IN501, IN502, IN503 Shown when Slot E = Bx SEL-751 Relay Instruction Manual Date Code 20170927...
Page 555 Shown when EBMON = Y INTIC, EXTIA, EXTIB, EXTIC Breaker Wear Screen 2 WEARA, WEARB, WEARC, Shown when EBMON = Y BR_LRD Reports Events Event History Screen 1 Shows the event records in the relay Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 556 MAC address (IP), MAC support them address (GOOSE), breaker control jumper, password bypass jumper, rated frequency, phase rotating, nominal phase CT rating, nominal/neutral CT rating, PT connection, date format SEL-751 Relay Instruction Manual Date Code 20170927...
Page 557 Trip and Diagnostic Screen 1 Diagnostic failures, trip event Always available types, and warnings In addition to the listed screens, the Home screen is available for the HOME pushbutton. By default, the HOME pushbutton is programmed to the Home screen. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 558 This page intentionally left blank...
Page 559: Overview
Section 9 Bay Control Overview The SEL-751 Relay with the touchscreen display option provides you with the ability to design bay configuration screens to meet your system needs. The bay configuration can be displayed as a single-line diagram (SLD) on the touchscreen.
Page 560: Table 9.1 Circuit Breaker Symbols
Typically, these SEL OGIC control equation settings are set to SEL-751 inputs that are wired to the corresponding auxiliary contacts. Figure 9.1 shows the dual-point disconnect status logic. The Relay Word bits 89CL2Pn and 89OP2Pn indicate the disconnect switch closed and open states, respectively.
Page 561: Table 9.2 Disconnect Settings
ANSI and IEC Motor- Transparent Operated Disconnect Local/Remote The SEL-751 supports local/remote breaker control functionality through supervision of the OC and CC breaker control Relay Word bits. The Breaker Control supervision of these breaker control Relay Word bits can be enabled or disabled with the global setting EN_LRC (see Table 9.4).
Page 562: Table 9.4 Local/Remote Breaker Control Settings
Figure 9.2, indicating that OC and CC bits are processed from both the touchscreen and remote sources/protocols. Local/remote indication is only available on the SEL-751 touchscreen display model. Refer to Bay Control Application Example on page 9.13 for example settings.
Page 563: Figure 9.3 Bay Screens Application Display With A Single-Line Diagram
Bay Control Overview Breaker Control Via The SEL-751 enables you to control the breaker from the touchscreen or the two-line LCD and through the front-panel operator control pushbuttons. Refer the Touchscreen to Front-Panel Operator Control Pushbuttons on page 8.15 for a discussion on breaker control via the control pushbuttons.
Page 564: Figure 9.5 Quickset Front-Panel Options
Front-Panel Options drop down as shown in Figure 9.5. Figure 9.6 shows the Touchscreen settings in QuickSet. Figure 9.5 QuickSet Front-Panel Options SEL-751 Relay Instruction Manual Date Code 20170927...
Page 565: Table 9.5 Touchscreen Settings
Relay Word Bit BK01OS := 52B Breaker Alarm Status Relay Word Bit BK01AS := NA Breaker HMI Close Command Relay Word Bit BK01CLC := NA Breaker HMI Open Command Relay Word Bit BK01OPC := NA Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 566 Use the FPBAB setting to control the backlight active brightness. Rotating Display Settings The SEL-751 allows you to configure as many as 16 screens for the rotating display. Configure the settings FPRDkk (kk = 01–16) to the screens most suitable to your application. Refer to Table 8.17 for the list of screens available as part of the FPRDkk settings.
Page 567: Figure
When QuickSet detects a breaker symbol as part of the single-line diagram, it populates the corresponding settings. The SEL-751 supports one three-pole breaker. The setting BK01TTY is forced to 3 by default and is not settable. The breaker on the single-line can be configured as monitor-only or as a controllable breaker.
Page 568: Figure 9.7 Layout Of Bay Screen Builder
Several of the settings identified in Table 9.5 are available for you to set depending on the symbols chosen for your single-line diagram. Figure 9.7 shows the layout of Bay Screen Builder and identifies different menus, panes, and information. Figure 9.7 Layout of Bay Screen Builder SEL-751 Relay Instruction Manual Date Code 20170927...
Page 569 Product Type: Displays the name of the QuickSet driver version of the product associated with the selected project (e.g., SEL-751 007, as shown in Figure 9.7). Select the product type in Bay Screen Builder when you create a new project independent of QuickSet. View Product Type though Settings >...
Page 570: Figure 9.8 Project Analysis Pane: Analysis Results Tab
You can adjust the size of the panes in the application. If you reconfigure the size of any of these panes, the new size is saved when you exit the application and applies the next time you launch Bay Screen Builder. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 571: Figure 9.10 Bay Control Single-Line Diagram Schematic
The SEL-751 supports as many as five custom screens. You can edit the predefined bay screen (Bay Screen 1) and the blank screens (Bay Screen 2, Bay Screen 3, Bay Screen 4, Bay Screen 5) (see Figure 9.12). You can also import one of the five predefined bay control single-line diagrams from the instruction manual CD.
Page 572: Figure 9.11 Device Part Number Touchscreen Configuration Option
(one screen with a predefined single-line diagram and four blank screens) and an enlarged view of the predefined single- line diagram, which is selected by default (see Figure 9.12). Figure 9.12 QuickSet Bay Control Project Management and Project Preview Display SEL-751 Relay Instruction Manual Date Code 20170927...
Page 573: Figure 9.13 Open Single-Line Diagram In Bay Screen Builder
Bay Control Application Example Build Single-Line Use Bay Screen Builder to create single-line diagrams to load onto the SEL-751 Relay through QuickSet. To create the single-line diagram shown in Diagrams in Bay Figure 9.10, perform the following steps. Screen Builder Step 1.
Page 574: Table 9.6 Symbols Required For The Single-Line Diagram Schematic In Figure
Appearance tab of the breaker properties to select a color scheme for your single-line diagram breaker. Step 1. Select the existing breaker symbol in the predefined single-line diagram to display the breaker symbol properties in the Properties pane, as shown in Figure 9.15. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 575: Figure 9.15 Selected Breaker Symbol Settings Displayed In The Properties Pane
QuickSet. of the quantities, if necessary. Publish the project using the following process after saving your edits. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 576: Figure 9.17 Publish Bay Screen Builder Project To Quickset
Step 3. Allow a few seconds for Bay Screen Builder to publish the project to QuickSet. Respond to the QuickSet prompt, if presented. QuickSet then populates the settings of the updated single-line diagram (see Figure 9.18). Figure 9.18 QuickSet Updated Single-Line Diagram and Corresponding Settings SEL-751 Relay Instruction Manual Date Code 20170927...
Page 577 89A and 89B for each of the three disconnect switches are wired to digital inputs IN301, IN302, IN303, IN304, IN305, and IN306. Disconnect settings are included in more than one settings class in QuickSet (Global, Bay Control). Enter the following settings: Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 578: Figure
Enter the following Bay Control, Bay Screen 1 setting: Setting Example Setting Comment IN307 SF6 breaker Local/Remote Control Setting Figure 9.10 is programmed with the local/remote functionality. Enter the following Global, Control Configuration setting: SEL-751 Relay Instruction Manual Date Code 20170927...
Page 579 OGIC equations, respectively. Enter the following Group settings: Setting Example Setting Comment ORED50T OR ORED51T OR ORED81T Trip logic OR REMTRIP OR OC OR SV04T SV03T AND LT02 OR CC Close logic Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 580: Figure 9.19 Final Bay Screen Builder Rendering
Alternately, QuickSet allows you to save the Bay Screen as well as all of the corresponding analog and digital quantities settings (Tools > Settings > Export > Touchscreen). SEL-751 Relay Instruction Manual Date Code 20170927...
Page 581: Figure 9.20 Import/Export Of The Bay Control Screen In Quickset
To create a single-line diagram with IEC symbols, click the New button in QuickSet to start a new Bay Screen Builder project and select IEC as the symbol type. Figure 9.21 Main Bus and Transfer Bus Bay Control Single-Line Diagram Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 582: Figure 9.22 Tie Breaker Bay Control Single-Line Diagram
Figure 9.22 Tie Breaker Bay Control Single-Line Diagram Figure 9.23 Bus 1 and Bus 2 Bay Control Single-Line Diagram Figure 9.24 Feeder Bay Control Single-Line Diagram Figure 9.25 Incomer With Step-Down Transformer Bay Control Single-Line Diagram SEL-751 Relay Instruction Manual Date Code 20170927...
Page 583: Overview
Accuracy: ±1/4 cycle All reports are stored in nonvolatile memory, ensuring that a loss of power to the SEL-751 does not result in lost data. The SEL-751 offers four styles of event reports: Standard ASCII (EVE) reports, Compressed ASCII (CEV) reports, Binary COMTRADE reports, and Sequential Event Recorder (SER) reports.
Page 584: Event Reporting
Refer to the SET R command in SET Command (Change Settings) on page 7.47 and Report Settings (SET R Command) on page SET.66. Triggering The SEL-751 triggers (generates) an event report when any of the following occur: ➤ Relay Word bit TRIP asserts ➤...
Page 585: Figure 10.1 Example Event Summary
SET R in SET Command (Change Settings) on page 7.47). When setting ER detects a logical 0 to logical 1 transition, it generates an event report (if the SEL-751 is not already generating a report that encompasses the new transition). The factory setting is shown in Event Report Settings on page 4.207.
Page 586: Table 10.1 Event Types
(50Q1T + 50Q2T + 50Q3T + 50Q4T+ 67Q1T + 67Q2T + 67Q3T + 67Q4T) * TRIP Phase A 51 Trip 51AT * TRIP Phase B 51 Trip 51BT * TRIP Phase C 51 Trip 51CT * TRIP Phase 51 Trip (51P1T + 51P2T) * TRIP SEL-751 Relay Instruction Manual Date Code 20170927...
Page 587: Table 10.2 Phase Involvement Event Type
PHASE_A * PHASE_B * TRIP BC T PHASE_B * PHASE_C * TRIP CA T PHASE_C * PHASE_A * TRIP ABG T PHASE_A * PHASE_B * GFLT * TRIP BCG T PHASE_B * PHASE_C * GFLT * TRIP Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 588 FSA, FSB, and FSC to help determine the fault type and to select the appropriate fault location method. The SEL-751 asserts one of the Relay Word bits FSA, FSB, or FSC based on the magnitude and angle difference of negative- and zero-sequence current.
Page 589 Event Reporting Fault Locator Operating Window The SEL-751 uses a 15-cycle subset of the event report data to calculate the event type and fault location. For Global settings LER := 64 or LER :=180, the relay processes the portion of stored data that includes the event report trigger.
Page 590: Figure 10.2 Sample Event History
HISTORY Command on page 7.37 for information on the HIS command. Use the front-panel menu to display event history MAIN > Events > Display data on the SEL-751 front-panel display. Use the QuickSet software to retrieve the relay event history. ERATOR View the Relay Event History dialog box via the Tools >...
Page 591: Table 10.3 Event Report Current And Voltage Columns
Filtered and Unfiltered Event Reports The SEL-751 samples the power system measurands (ac voltage and ac current) 32 times per power system cycle. A digital filter extracts the fundamental frequency component of the measurands. The relay operates on the filtered values and reports these values in the standard, filtered event report.
Page 592: Table 10.4 Output, Input, Protection, And Control Element Event Report Columns
All four 50P1P & 50P2P & 50P3P & 50P4P picked up 67P1P picked up 67P2P picked up 67P3P picked up 67P4P picked up Both 67P1P & 67P2P picked up Both 67P1P & 67P3P picked up SEL-751 Relay Instruction Manual Date Code 20170927...
Page 593 These quantities are not displayed when the relay has the voltage card option with VS (synchronized voltage) and VDC (battery voltage) inputs. Note that the ac values change from plus to minus (–) values in Figure 10.3, indicating the sinusoidal nature of the waveforms. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 594: Figure 10.3 Example Standard 15-Cycle Event Report 1/4-Cycle Resolution
) in the column following the column identifies the row with the maximum phase current. The SEL-751 calculates maximum phase current from the row identified with the asterisk and the row one quarter-cycle previous (see Figure 10.4 and Figure 10.5). These currents are listed at the end of the event report in the event summary.
Page 595 48 ..3 -158 -414 12.0 -8111 10341 -2088 -8188 48 ... Serial No = 000000000000000 FID = SEL-751-X272-V0-Z006002-D20150103 CID = 6803 EVENT LOGS = REF_NUM = 10023 Event: BG T Location $$$$$$$$ Targets 11001101 Freq (Hz) 60.0...
Page 596 RSTTRGT := 0 RSTENRGY:= 0 RSTMXMN := 0 RSTDEM := 0 RSTPKDEM:= 0 DSABLSET:= 0 TIME_SRC:= IRIG1 TIME_SRC:= IRIG1 Group Settings := SEL-751 := FEEDER RELAY := 120 CTRN := 120 := 180.00 PTRS := 180.00 DELTA_Y := DELTA VSCONN...
Page 597 RA06TYPE:= I RA07TYPE:= I RA08TYPE:= I RA09TYPE:= I RA10TYPE:= I RA11TYPE:= I RA12TYPE:= I RA13TYPE:= I RA14TYPE:= I RA15TYPE:= I RA16TYPE:= I RA17TYPE:= I Figure 10.3 Example Standard 15-Cycle Event Report 1/4-Cycle Resolution (Continued) Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 598 Figure 10.5 shows how the event report current column data can be converted to phasor rms values. Voltages are processed similarly. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 599: Figure 10.4 Derivation Of Event Report Current Values And Rms Current Values From Sampled Current Waveform
The present sample (IA = 940.7 A) is a real rms current value that relates to the phasor rms current value: –   1204 A cos 38.6 940.7 A • Equation 10.2 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 600: Figure 10.5 Derivation Of Phasor Rms Current Values From Event Report Current Values
IEC 61850 and only when IEC 61850 and MMS File transfer are enabled (E61850 := Y, EMMSFS := Y). See File Transfer Protocol (FTP) and MMS File Transfer on page 7.13, Virtual File Interface on page 7.58, and MMS on page F.4 for additional information. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 601: Figure 10.6 Sample Compressed Ascii Event Report
Compressed ASCII command set. =>>CEV <Enter> "FID","CEV_VER","PART_NUM","SER_NUM","097C" Report Header "FID=SEL-751-R112-V0-Z006002-D20151112","2.0.1","751401B0X0XL087067N","000000000000000","120A" "MONTH","DAY","YEAR","HOUR","MIN","SEC","MSEC","0ACA" 12,14,2016,12,23,52,927,"0496" "REC_NUM","REF_NUM","NUM_CH_A","NUM_CH_D","FREQ","NFREQ","SAM/CYC_A","SAM/ CYC_D","NUM_OF_CYC","PRIM_VAL","CTR_IA","CTR_IB","CTR_IC","CTR_IN","CTR_IG","PTR_VAB","PTR_VBC","PT Summary Labels R_VCA","PTR_VS","EVENT","LOCATION","GROUP","IA(A)","IB(A)","IC(A)","IN(A)","IG(A)","VAB(V)","VBC(V) ","VCA(V)","VS(V)","VDC(V)","WDG(C)","BRG(C)","AMB(C)","OTH(C)","5057" 1,36266,19,1264,60.0,60,4,4,15,"YES",120.00,120.00,120.00,120.00,120.00,180.00,180.00,180.00,4.80,"A Summary Data G T",$$$$,1,1212.2,119.6,122.2,0.00,1089.0,12049.299,12055.252,20960.781,0.152,2.012,"NA","NA","NA" ,"NA","2753" Figure 10.6 Sample Compressed ASCII Event Report Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 602 DIRNF DIRNR 67N1P 67N2P 67N3P 67N4P 67N1T 67N2T 67N3T 67N4T 27I1 27I1T 27I1RS * 27I2 27I2T 27I2RS * 59I1 59I1T 59I1RS * 59I2 59I2T 59I2RS * 59I3 59I3T 59I3RS * 59I4 59I4T 59I4RS * * * * * * * * *","E374" Figure 10.6 Sample Compressed ASCII Event Report (Continued) SEL-751 Relay Instruction Manual Date Code 20170927...
Page 603 This is 000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 0000000000000000000000000000000000F00000000000000000000000FFF80019000000000007000009000000000000000 the row used for the 03C000000000000000000","4F72" summary data 452,-107,60.0,0.0,405,5324,-6552,1228,-1,3,0.01,0.01,0.25,0.22,0.00,0.00,0.00,0.00,60.00, ,"8880800000990066900000080100000000000000210000000000000000000680070018290021000000000000000000000 000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 0000000000000000000000000000000000F00000000000000000000000FFF80019000000000007000009000000000000000 03C000000000000000000","4DB6" 760,6.0,-84.6,0.0,682,10802,10127,-20929,0,2,0.02,0.01,0.26,0.21,0.00,0.00,0.00,0.00,60.00, ,"8880800000990066900000080100000000000000210000000000000000000680070018290021000000000000000000000 000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 0000000000000000000000000000000000F00000000000000000000000FFF80019000000000007000009000000000000000 03C000000000000000000","4E28" Figure 10.6 Sample Compressed ASCII Event Report (Continued) Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 604 := 0 := 0 := 0 VSRCF := 1.000 VSPAC := 0.0 • • • Group Settings := SEL-751 := FEEDER RELAY := 120 CTRN := 120 := 180.00 LEA_S_R := 180.00 LEA_S_SC:= 4.80 DELTA_Y := DELTA VSCONN := VS...
Page 605: Figure 10.7 Sample Cev Report Viewed With Analytic Assistant Or
Figure 10.7 Sample CEV Report Viewed With Analytic Assistant or QuickSet Via SEL-5601 ERATOR With Analytic Assistant, you have two options for converting ERATOR CEV reports to COMTRADE, as shown in Figure 10.8. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 606: Figure 10.8 Options For Converting Cev Reports To Comtrade In Analytic Assistant
COMTRADE file. Figure 10.8 Options for Converting CEV Reports to COMTRADE in Analytic Assistant COMTRADE File The SEL-751 stores high-resolution raw data oscillography in binary format and uses COMTRADE file types to output these data: Format Event Reports ➤...
Page 607: Figure 10.9 Sample Comtrade .Hdr Header File
:= 20.00 BKMON := TRIP RSTTRGT := 0 RSTENRGY:= 0 RSTMXMN := 0 Relay Settings RSTDEM := 0 RSTPKDEM:= 0 DSABLSET:= 0 TIME_SRC:= IRIG1 TIME_SRC:= IRIG1 Figure 10.9 Sample COMTRADE .HDR Header File Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 608 10.26 Analyzing Events Event Reporting Group Settings := SEL-751 := FEEDER RELAY := 1 CTRN := 1 := 1.00 DELTA_Y := WYE SINGLEV := N VNOM := OFF 50P1P := 10.00 50P1D := 0.00 50P1TC := 1 50P2P := 10.00 50P2D := 0.00...
Page 609 RA20TYPE:= I RA21TYPE:= I RA22TYPE:= I RA23TYPE:= I RA24TYPE:= I RA25TYPE:= I RA26TYPE:= I RA27TYPE:= I RA28TYPE:= I RA29TYPE:= I RA30TYPE:= I RA31TYPE:= I RA32TYPE:= I Figure 10.9 Sample COMTRADE .HDR Header File (Continued) Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 610: Figure 10.10 Sample Comtrade .Cfg Configuration File Data
Figure 10.10). A <CR><LF> follows each line. If control inputs or control outputs are unavailable because of board loading and configuration, the relay does not report these inputs and outputs in the analog and digital sections of the .CFG file. COMTRADE Standard <RID setting>,FID=SEL-751-Rxxx-V0-Zxxxxxx-Dyyyymmdd,1999 Total Channels, Analog, Digital #T,#A,#D 1,IA,A,,A,scale_factor ,0.0,0,-32767,32767,[CTR],1.0,P 2,IB,B,,A,scale_factor ,0.0,0,-32767,32767,[CTR],1.0,P...
Page 611: High-Impedance Fault (Hif) Event Reporting
20 stored events at the minimum HIFLER setting transfer files using MMS, set EMMSFS of two minutes. The length of time reserved within the stored event report for to Y. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 612: Table 10.5 Cev Hif Commands
The event summary contains the following information: ➤ Standard report header ➢ Relay and terminal identification ➢ Event date and time ➤ Event type ➤ HIF Phase ➤ Event logs ➤ Downed Conductor SEL-751 Relay Instruction Manual Date Code 20170927...
Page 613: Table 10.6 Hif Event Types
(LR) bits. A drawback of this approach, however, is that if an event does not lead to enough of a drop in load current, the load reduction logic may not operate (and hence not alarm). Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 614: Table 10.8 Hif Downed Conductor
For the purpose of improving products and services, SEL sometimes changes the items and item order. See Compressed Event Reports on page 10.2 for more information on the Compressed ASCII command set. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 615: Figure 10.12 Sample Compressed Ascii Hif Summary
The relay places a blank row in the history report output; items that are above the blank row are available for viewing (use the CEV HIF command). Items that are Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 616: Table 10.10 His Hif Command
Clears HIF event and history, also resets the event identifier so that the next event generated has event identifier 10000. CHISTORY HIF The SEL-751 provides Compressed ASCII event reports to facilitate event report storage and display. SEL communications processors and the Analytic Assistant take advantage of the Compressed ASCII ERATOR format.
Page 617: Figure 10.15 Sample Hif Comtrade .Hdr Header File
File Transfer on page 10.18 for details on retrieving compressed events via FTP or MMS File transfer. High-Impedance Fault The SEL-751 stores high-impedance fault oscillography in binary format and uses COMTRADE file types to output these data: COMTRADE File ➤...
Page 618 Many programs read the binary COMTRADE files. These programs include Analytic Assistant. See Retrieving COMTRADE Event Files on page 10.29 for details on retrieving COMTRADE event files via FIL command, FTP, or MMS File transfer. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 619: Figure 10.17 Example Sequential Events Recorder (Ser) Event Report
Figure 10.3. =>SER 8 <Enter> SEL-751 Date: 02/28/2007 Time: 16:34:28 FEEDER RELAY Time Source: Internal Serial No = 2007XXXXXXXXXXX FID = SEL-751-R100-V0-Z001001-D20070410 CID = 5052 DATE TIME ELEMENT STATE 02/28/2007 13:54:09.602...
Page 620 This page intentionally left blank...
Page 621: Overview
➤ Tests performed periodically once the relay is in service This section provides information on both types of testing for the SEL-751 Feeder Protection Relay. Because the SEL-751 is equipped with extensive self-tests, traditional periodic test procedures can be eliminated or greatly reduced.
Page 622: Table 11.1 Resultant Scale Factors For Inputs
Testing and Troubleshooting Testing Tools Low-Level Test The SEL-751 has a low-level test interface on the 4 ACI/3 AVI current/voltage card with both the LEA voltage inputs and the regular voltage inputs in Slot Z Interface and on the 2 AVI/4 AFDI voltage card with both the LEA voltage input and the regular voltage input for the VS channel in Slot E.
Page 623: Commissioning Tests
Commissioning tests confirm that the relay is properly connected including the control signal inputs and outputs. The following connection tests help you enter settings into the SEL-751 and verify that the relay is properly connected. Brief functional tests ensure that the relay settings are correct.
Page 624 (DELTA_Y := WYE), set the current and/or voltage phase angles as shown in Figure 11.2. c. If you set the relay to accept delta voltages (DELTA_Y := DELTA), set the current and/or voltage phase angles as shown in Figure 11.3. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 625: Figure 11.2 Three-Phase Wye Ac Connections
METER command to verify that the relay is measuring the magnitude and phase angle of both voltage and current correctly, taking into account the relay PTR and CTR settings and the fact that the quantities are displayed in primary units. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 626: Table 11.2 Serial Port Commands That Clear Relay Data Buffers
METER command. METER > Fundamental ➢ Phase current magnitudes should be nearly equal. ➢ Phase current angles should be balanced, have proper phase rotation, and have the appropriate phase relationship to the phase voltages. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 627: Table 11.3 Phase Current Measuring Accuracy
Phase voltage magnitudes should be nearly equal. ➢ Phase voltage phase angles should be balanced and have proper phase rotation. The SEL-751 is now ready for continuous service. Functional Tests Phase Current Measuring Accuracy Step 1. Connect the current source to the relay, as shown in Figure 11.4.
Page 628: Table 11.4 Current Unbalance Measuring Accuracy
Step 1. Connect the current source to the relay, as shown in Figure 11.4. Step 2. Connect the voltage source to the relay, as shown in Figure 11.5. Make sure that DELTA_Y := WYE. Voltage SEL-751 Test Source Figure 11.5 Wye Voltage Source Connections SEL-751 Relay Instruction Manual Date Code 20170927...
Page 629: Table 11.5 Power Quantity Accuracy-Wye Voltages
CTR, PTR, and PHROT setting values. Step 4. Apply the current and voltage quantities shown in Column 1 of Table 11.6. Values are given for PHROT := ABC and PHROT := ACB. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 630: Table 11.6 Power Quantity Accuracy-Delta Voltages
The SEL-4520 is used to test the SEL-751 and SEL-751A Feeder Protection Relays and other arc- flash detection relays that use light and overcurrent to sense an arc-flash event.
Page 631 "raw" current input samples and act instantaneously to achieve fast response. You can test these elements similarly to the 50P and 50N elements. You can use the CEV R report as described previously to analyze the event. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 632: Table 11.7 Periodic Relay Checks
Such reviews frequently reveal problems with equipment external to the relay, such as instrument transformers and control wiring. The SEL-751 does not require specific routine tests, but your operation stan- dards may require some degree of periodic relay verification. If you need or want to perform periodic relay verification, the following checks are recom- mended.
Page 633: Self-Test
Make sure that each contact closure does what you want it to do in the annunciation, control, or trip circuit associated with that contact closure. Self-Test The SEL-751 runs a variety of self-tests. The relay takes the following corrective actions for out-of-tolerance conditions (see Table 11.8): ➤...
Page 634: Table 11.8 Relay Self-Tests
I/O Board Failure Latched Status Fail Check if ID register matches part number Card [C|D|E] Failure DeviceNet Board Failure COMMFLT DeviceNet card does not respond in three Warning consecutive 300 ms time out periods SEL-751 Relay Instruction Manual Date Code 20170927...
Page 635 Monitor -5 V power supply –5.35 V –5 V Failure Clock Battery 2.3 to STA C, to clear Monitor Clock Battery 3.5 V Latched the warning in the status report. Contact SEL if failure returns. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 636: Table 11.9 Troubleshooting
The relay does not accurately measure voltages or currents. Wiring error Verify input wiring. Incorrect CTR, CTRN, or PTR setting Verify instrument transformer ratios, connections, and associated settings. Voltage neutral terminal (N) is not properly grounded. Verify wiring and connections. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 637: Factory Assistance
Factory Assistance We appreciate your interest in SEL products and services. If you have questions or comments, please contact us at: Schweitzer Engineering Laboratories, Inc. 2350 NE Hopkins Court Pullman, WA 99163-5603 U.S.A. Tel: +1.509.338.3838 Fax: +1.509.332.7990 Internet: selinc.com...
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Page 639: Table A.1 R200 Series Firmware Revision History
Table A.1 R200 Series Firmware Revision History (Sheet 1 of 2) Manual Firmware Identification (FID) Number Summary of Revisions Date Code SEL-751-R200-V4-Z007003-D20170922 Includes all the functions of SEL-751-R200-V3-Z007003-D20170814 20170922 with the following additions: ➤ Addressed an issue in the previous firmware that could cause IEC 61850 GI buffered reports to be out of sequence when the number of uncollected reports exceeded 200.
Page 640 Added Modbus Master IP settings. ➤ Added new SEL control equation HIFITUNE to reinitiate OGIC 24-hour tuning. ➤ SEL-751-R200-V1 SEL-751 R200-V1 was not released. R200-V2 follows R112-V1. — ➤ SEL-751-R200-V0 SEL-751 R200-V0 was not released. R200-V1 follows R112-V1. — SEL-751 Relay Instruction Manual...
Page 641: Table A.2 R100 Series Firmware Revision History
Table A.2 R100 Series Firmware Revision History (Sheet 1 of 5) Manual Firmware Identification (FID) Number Summary of Revisions Date Code SEL-751-R112-V3-Z006002-D20170922 Includes all the functions of SEL-751-R112-V2-Z006002-D20170814 20170922 with the following additions: ➤ Addressed an issue in the previous firmware that could cause IEC 61850 GI buffered reports to be out of sequence when the number of uncollected reports exceeded 200.
Page 642 STA C. ➤ Modified the prompt for DNP Master IP Address DNPIPn to distinguish them from the device IP Address. ➤ SEL-751-R111 SEL-751 R111 was not released. R112 follows R110. — SEL-751 Relay Instruction Manual Date Code 20170927...
Page 643 Corrected an issue with writing to User Map registers 1–125 with Modbus function code 06. ➤ Corrected an issue with DNP Binary Outputs reported as OFFLINE. ➤ Corrected an issue with angle calculations for analog quantities. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 644 Modified Real Time Clock (RTC) diagnostics logic to show failure only if the RTC diagnostics fail three consecutive times. ➤ Extended the setting range for the time dial of all the IEC TOC elements to 0.05–1.50. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 645: Table A.3 Sel Display Package Revision History
Initial version. 20110601 SEL Display Package The SEL-751 with the touchscreen display option has display packages for the SEL display and default custom display. Table A.3 lists the display package Versions version, a description of the modifications, and the instruction manual date code that corresponds to the display package versions.
Page 646: Table A.5 Devicenet Card Versions
The firmware on the DeviceNet interface has two versions, as listed in Table A.5. The version number of this firmware is only accessible via the Firmware Versions Device Net interface. The SEL-751 needs DeviceNet firmware version 1.005. Table A.5 DeviceNet Card Versions DeviceNet Card Software Version...
Page 647: Table A.7 Sel-751 Icd File Revision History
Firmware, ICD, and Manual Versions ICD File Table A.7 SEL-751 ICD File Revision History (Sheet 1 of 4) Architect ERATOR Relay Manual ClassFile configVersion Summary of Revisions Firmware Date File Software Version Compatibility Code Description Version ➤ ICD-751-R201-V0- Increased the maximum...
Page 648 A.10 Firmware, ICD, and Manual Versions ICD File Table A.7 SEL-751 ICD File Revision History (Sheet 2 of 4) Architect ERATOR Relay Manual ClassFile configVersion Summary of Revisions Firmware Date Version File Software Compatibility Code Description Version ➤ Added filehandling service.
Page 649 Firmware, ICD, and Manual Versions A.11 ICD File Table A.7 SEL-751 ICD File Revision History (Sheet 3 of 4) Architect ERATOR Relay Manual ClassFile configVersion Summary of Revisions Firmware Date Version File Software Compatibility Code Description Version ➤ Added new attributes DmdA.nseq and...
Page 650 A.12 Firmware, ICD, and Manual Versions ICD File Table A.7 SEL-751 ICD File Revision History (Sheet 4 of 4) Architect ERATOR Relay Manual ClassFile configVersion Summary of Revisions Firmware Date Version File Software Compatibility Code Description Version ➤ Modified data types for MaxA,...
Page 651: Table A.8 Instruction Manual Revision History
Updated Overview and Protection Features and added Table 1.1: Phase and Neutral Current Ratings Selection for the SEL-751 Models, Table 1.2: Current (ACI) and Voltage (AVI) Card Selection for SEL-751 Models, Table 1.3: SEL-751 Protection Elements, and Table 1.4: SEL-751 Front-Panel Options.
Page 652 Definitions, Table 7.52: TIME Command (View/Change Time), Table 7.56: FTP and MMS Virtual File Structure, and Table 7.60: Files Available for Ymodem Protocol. ➤ Updated SER Command (Sequential Events Recorder Report) and added HMI Directory (Read and Write). SEL-751 Relay Instruction Manual Date Code 20170927...
Page 653: Modbus Register Map
Updated Table F.20: Logical Device: PRO (Protection) and Table F.21: Logical Device: MET (Metering). Appendix I ➤ Updated Overview, Table I.1: PMU Settings in the SEL-751 for C37.118 Protocol in Global Settings, and Table I.6: SEL-751 Ethernet Port Settings for Synchrophasors. ➤...
Page 654 ➤ Updated the R112-V0 firmware revision history to include the GOOSE performance enhancement. Appendix K ➤ Updated Table K.2: Relay Word Bit Definitions for the SEL-751 Relay for AFS1DIAG through AFS4DIAG. 20151112 Preface ➤ Updated Wire Sizes and Insulation table for RTD connections.
Page 655 Appendix E ➤ Updated Table E.34: Modbus Register Map for the new features. Appendix F ➤ Updated the Logical Nodes description detailed in this manual revision for the SEL-751 006 ICD file. Appendix G ➤ Added IEC-60870-5-103 documentation. Appendix K ➤...
Page 656 Updated Table 10.8: Relay Self-Tests. Appendix A ➤ Updated for firmware version R110. ➤ Added ICD File section with Table A.4: SEL-751 ICD File Revision History. Appendix H ➤ Updated Table H.2: Synchrophasor Order in Data Stream (Voltages and Currents). ➤...
Page 657 Updated Table 7.23: HIS HIF Command with HIS HIF C or R and HIS HIF CA or RA commands. Section 9 ➤ Updated the event storage capability of the SEL-751 in Event Reporting and Event Summaries. Section 10 ➤ Updated Table 10.8: Relay Self-Tests.
Page 658 Updated the definition for the SALARM Relay Word bit. 20130206 Preface ➤ Updated the product labels for the SEL-751. Section 1 ➤ Updated mounting screw size and current/voltage input terminal block information under the Terminal Connections category of the Specifications.
Page 659 Added SEL-4520 Arc Flash Test Module reference in Arc-Flash Protection Tests. Appendix A ➤ Updated for firmware version R103. Appendix E ➤ Removed Modifying Relay Settings Using Modbus 20110720 Appendix A ➤ Updated for firmware version R102. ➤ 20110601 Initial version. Date Code 20170927 Instruction Manual SEL-751 Relay...
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Page 661: Overview
SEL-701 Relay and SEL-734 Meter. SEL occasionally offers firmware upgrades to improve the performance of your relay. Because SEL-751 relays store firmware in flash memory, changing physical components is not necessary. Upgrade the relay firmware by downloading a file from a personal computer to the relay via the front-panel...
Page 662: Upgrade Firmware Using Quickset
Step 1. Prepare the device. a. Select the firmware to be loaded using the browse control and select Save calibration settings, Save device settings, and Save events. Select Next to continue the wizard. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 663 If there are any event reports to be saved, click the Get Selected Event button after selecting the events. After saving them, click the Return to Firmware Loader button. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 664 Step 2. Transfer Firmware. Click Next to begin the firmware transfer. Step 3. Load Firmware. During this step, the device is put in SEL mode. BOOT The transfer speed is maximized and the firmware transfer begins. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 665 Settings are converted automatically, if necessary. Load Firmware into Another Device. Returns the wizard to Step 1: Prepare Device to repeat the firmware-loading process with another device. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 666: Upgrade Firmware Using A Terminal Emulator
We recommend that you save all stored data in the NOTE: When you are upgrading an relay, including EVENTS, before the upgrade. SEL-751 with a touchscreen front- panel display, save all of the relay Step 4. Start upgrading the firmware. settings, including the touchscreen settings, using QuickSet.
Page 667: Figure B.1 Firmware File Transfer Process
Step 11. Change the data rate of the PC to match that of the relay prior to Step 5, and enter Access Level 2. Step 12. Issue the STATUS command; verify all relay self-test results are OK. Step 13. Apply current and voltage signals to the relay. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 668: Protocol Verification For Relays With Iec 61850 Option
Step 4. In the Telnet session, type GOO <Enter>. Step 5. View the GOOSE status and verify that the transmitted and received messages are as expected. The relay is now ready for your commissioning procedure. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 669: Factory Assistance
Firmware Upgrade Instructions Factory Assistance Factory Assistance We appreciate your interest in SEL products and services. If you have questions or comments, please contact us at: Schweitzer Engineering Laboratories, Inc. 2350 NE Hopkins Court Pullman, WA 99163-5603 U.S.A. Tel: +1.509.338.3838 Fax: +1.509.332.7990 Internet: selinc.com...
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Page 671: Table C.1 Supported Serial Command Sets
Appendix C SEL Communications Processors SEL Communications Protocols The SEL-751 Feeder Protection Relay supports SEL protocols and command sets shown in Table C.1. Table C.1 Supported Serial Command Sets Command Set Description SEL ASCII Use this protocol to send ASCII commands and receive ASCII responses that are human readable with an appropriate termi- nal emulation program.
Page 672: Table C.2 Compressed Ascii Commands
Fast Meter and Fast Operate messages to populate a local database and to perform SCADA operations. At the same time, you can use the binary data stream to connect transparently to the SEL-751 and use the ASCII data stream for commands and responses.
Page 673: Figure C.1 Sel Communications Processor Star Integration Network
The SEL-2030 series and the SEL-2020 communications processors are similar, except that the SEL-2030 series has NOTE: If the SEL-751 is connected to any SEL communications processor two slots for network protocol cards. The SEL-3530 Real Time Automation...
Page 674: Table C.3 Sel Communications Processors Protocol Interfaces
Plus masters FTP (File Transfer Protocol) FTP clients Telnet Telnet servers and clients UCA2 GOMSFE UCA2 protocol masters UCA2 GOOSE UCA2 protocol and peers Requires SEL-2711 Modbus Plus protocol card. Requires SEL-2701 Ethernet Processor. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 675: Sel Communications Processor And Relay Architecture
SEL communications processors equipped with an SEL-2701 Ethernet Processor can provide a UCA2 interface to SEL-751 Relays and other serial IEDs. The SEL-751 data appear in models in a virtual device domain. The combination of the SEL-2701 with an SEL communications processor offers a significant cost savings because you can use existing IEDs or purchase less expensive IEDs.
Page 676: Figure C.3 Enhancing Multidrop Networks With Sel Communications Processors
Modem SEL Communications Processor EIA-232 SEL-421 Relay Ethernet IED SEL-751 Relay SEL Relay Non-SEL IED Figure C.3 Enhancing Multidrop Networks With SEL Communications Processors In this example, the SEL communications processor provides the following enhancements when compared to a system that employs only the multidrop network: ➤...
Page 677: Table C.4 Sel Communications Processor Port 1 Settings
SEL Communications Processor Example SEL Communications Processor Example This example demonstrates the data and control points available in the SEL communications processor when you connect an SEL-751. The physical configuration used in this example is shown in Figure C.4. Personal...
Page 678: Table C.6 Sel Communications Processor Port 1 Automatic Messaging Settings
No USER region registers reserved Table C.7 shows the map of regions in the SEL communications processor for data collected from the SEL-751. Use the MAP n command to view these data. Table C.7 SEL Communications Processor Port 1 Region Map...
Page 679: Table C.9 Communications Processor Target Region
2804h PWRUP STSET 2805h See Table K.1, Row 0 2806h See Table K.1, Row 1 2807h See Table K.1, Row 2 2808h See Table K.1, Row 3 2809h See Table K.1, Row 4 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 680 SEL-751 that asserts the OC bit for one processing interval. If you clear BR1, the SEL communications processor sends a message to the SEL-751 that asserts the CC bit for one processing interval. OC opens the breaker (via SEL...
Page 681: Table C.10 Communications Processor Demand Region Map
SEL-2032, Unsolicited Write SEL-2030, or SEL-2020 Communications Processor. Once these values from the remote devices are written into the memory addresses in the SEL-751, you Remote Analog can use these values similar to any other analog quantity in the SEL-751.
Page 682: Figure C.5 Unsolicited Write Settings
Figure C.5 Unsolicited Write Settings The Unsolicited Write message string \W;06:USER:0000h;20,03:USER:0000h/ contains all the information necessary to send the remote analog data to the SEL-751. Following is a discussion on the elements of the Unsolicited Write message string. ➤ \W; indicates this is an Unsolicited Write Message ➤...
Page 683 Following are 16-bit register data that are stored in the User region of Port 6 and sent to the SEL-751 on Port 3. Remember that F800H is synonymous with the start of the USER region in the SEL communications processor. One register stores one Integer and two registers store one Float or Long data type.
Page 684: Figure C.6 Setting Remote Analogs Ra01 Through Ra13
SEL-751 and populate Remote Analogs 1–12 with the corresponding stored data in the SEL communications processor User region on Port 6. Execute a MET RA or CME RA in the SEL-751 to retrieve the Remote Analog data. SEL-751 Relay...
Page 685: Table D.1 Dnp3 Implementation Levels
Appendix D DNP3 Communications Overview The SEL-751 Feeder Protection Relay provides a Distributed Network Protocol Version 3.0 (DNP3) Level 2 Outstation interface for direct serial and LAN/WAN network connections to the device. This section covers the following topics: ➤ Introduction to DNP3 on page D.1 ➤...
Page 686 The object listing for the device shows the permitted function codes for each type of object. The most common DNP3 function codes are listed in Table D.2. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 687: Table D.2 Selected Dnp3 Function Codes
Table D.3. The access methods listed in Table D.3 are listed in order of increasing communications efficiency. With various trade-offs, each method is less demanding of communications bandwidth than the previous one. For example, Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 688: Table D.3 Dnp3 Access Methods
Sometimes, DNP3 outstations assign special operation characteristics to the latch and pulse selections. Table D.13 describes control point operation for the SEL-751. Conformance Testing In addition to the protocol specifications, the DNP Users Group has approved conformance-testing requirements for Level 1 and Level 2 devices.
Page 689 DNP3 with the Internet Assigned Numbers Authority (IANA). Use this port for either TCP or UDP. TCP/UDP Selection The Committee recommends the selection of TCP or UDP protocol as per the guidelines in Table D.4. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 690: Table D.4 Tcp/Udp Selection Guidelines
(CDPD) Low priority data, for example, data monitor or configuration information DNP3 in the SEL-751 The SEL-751 is a DNP3 Level 2 remote (outstation) device without dual end point. Data Access Table D.5 lists DNP3 data access methods along with corresponding SEL-751 settings.
Page 691: Figure D.1 Application Confirmation Timing With Uretry N = 2
For example, if you use the settings of 0.10 seconds for MAXDLY and 0.05 seconds for MINDLY, the SEL-751 inserts a random delay of 50 to 100 ms (milliseconds) between the end of carrier detection and the start of data transmission (see Figure D.2).
Page 692: Figure D.2 Message Transmission Timing
Event Data DNP3 event data objects contain change-of-state and time-stamp information that the SEL-751 collects and stores in a buffer. Points assigned in the Binary Input Map that are also assigned in the Sequential Events Recorder (SER) settings carry the time stamp of actual occurrence. Binary input points not assigned in the SER settings carry a time stamp based on the DNP map scan time.
Page 693: Table D.6 Sel-751 Event Buffer Capacity
NUMEVEn. The device also sends an unsolicited report if the age of the oldest event in the master n buffer exceeds AGEEVEn. The SEL-751 has the buffer capacities listed in Table D.6.
Page 694 If PH_NUM2 is set, use the RETRY1 setting to configure the number of times the SEL-751 tries to dial PH_NUM1 before dialing PH_NUM2. Similarly, the RETRY2 setting is the number of attempts the SEL-751 tries to dial PH_NUM2 before trying PH_NUM1. MDTIME sets the length of time from initiating the call to declaring it failed because of no connection, and MDRET sets the time between dial-out attempts.
Page 695: Table D.7 Port Dnp3 Protocol Settings
DNP3 Communications D.11 DNP3 in the SEL-751 Table D.7 Port DNP3 Protocol Settings (Sheet 1 of 2) Range Default Name Description EDNP Enable DNP3 Sessions 0–5 DNPNUM DNP3 TCP and UDP Port 1–65534 20000 DNPADR Device DNP3 address 0–65519 Session 1 Settings DNPIP1 IP address (zzz.yyy.xxx.www)
Page 696: Table D.8 Serial Port Dnp3 Modem Settings
D.12 DNP3 Communications DNP3 in the SEL-751 Table D.7 Port DNP3 Protocol Settings (Sheet 2 of 2) Range Default Name Description Session 3 Settings DNPIP3 IP address (zzz.yyy.xxx.www) 15 characters “” DNPTR3 Transport protocol UDP, TCP · · · URETRY3 Unsolicited messages maximum retry attempts 2–10...
Page 697 DNP3 Communications D.13 DNP3 in the SEL-751 Table D.8 Serial Port DNP3 Modem Settings (Sheet 2 of 2) Name Description Range Default RETRY1 Retry attempts for primary dial 1–20 out; hidden and unused if PH_-NUM2 set to “” RETRY2 Retry attempts for secondary dial 1–20...
Page 698: Table D.9 Sel-751 Dnp Object List
Object List Table D.9 lists the objects and variations with supported function codes and qualifier codes available in the SEL-751. The list of supported objects conforms to the format laid out in the DNP specifications and includes both supported and unsupported objects for DNP3 implementation Level 2 and higher and unsupported objects for DNP3 implementation Level 2 only.
Page 699 DNP3 Communications D.15 DNP3 Documentation Table D.9 SEL-751 DNP Object List (Sheet 2 of 6) Request Response Obj. Var. Description Funct. Qual. Funct. Qual. Codes Codes Codes Codes Device Attributes—Device manufacturer’s hardware 0,17 version Device Attributes—User-assigned location name 0,17 Device Attributes—User assigned ID code/number 0,17 Device Attributes—User assigned ID code/number...
Page 700 D.16 DNP3 Communications DNP3 Documentation Table D.9 SEL-751 DNP Object List (Sheet 3 of 6) Request Response Obj. Var. Description Funct. Qual. Funct. Qual. Codes Codes Codes Codes 32-Bit Frozen Counter With Time of Freeze 16-Bit Frozen Counter With Time of Freeze...
Page 701 DNP3 Communications D.17 DNP3 Documentation Table D.9 SEL-751 DNP Object List (Sheet 4 of 6) Request Response Obj. Var. Description Funct. Qual. Funct. Qual. Codes Codes Codes Codes 16-Bit Frozen Analog Input Without Flag Short Floating Point Frozen Analog Input Long Floating Point Frozen Analog Input Analog Change Event—All Variations...
Page 702 D.18 DNP3 Communications DNP3 Documentation Table D.9 SEL-751 DNP Object List (Sheet 5 of 6) Request Response Obj. Var. Description Funct. Qual. Funct. Qual. Codes Codes Codes Codes Time and Date With Interval Time and Date Last Recorded 7 quantity = 1 Time and Date CTO—All Variations...
Page 703: Table D.10 Dnp3 Reference Data Map
Protocol support in the SEL-751. Reference Data Map Table D.10 shows the SEL-751 reference data map. The reference map shows the data available to a DNP3 master. You can use the default map or the custom DNP3 mapping functions of the SEL-751 to retrieve only the points necessary for your application.
Page 704: Table D.11 Dnp3 Default Data Map
Default Data Map The default data map is an automatically generated subset of the reference map. All data maps are initialized to the default values, based on the SEL-751 part number. Table D.11 shows the SEL-751 default data map. If the default...
Page 705 Analog Input cards in slots 3, 4, and 5. If these cards are Object 34 are stored in nonvolatile present, the SEL-751 adds each analog input point label, AIx0y (where x is the memory. Make sure to reissue the...
Page 706 RB01–RB32, OC/CC respond with the on-line bit set and the state of the requested bit. Reads from control-only binary output points respond with the on-line bit set and a state of 0.The SEL-751 supports Control Relay Output Block objects (Object 12,Variation 1). The control relays correspond to the remote bits and other functions as shown previously.
Page 707: Table D.12 Sel-751 Object 12 Control Operations
DNP3 Communications D.23 DNP3 Documentation The SEL-751 also supports Pattern Control Blocks (Object 12, Variations 2 and 3) to control multiple binary output points. Variation 2 defines the control type (Trip/Close, Set/Clear, or Pulse) and the range of points to operate.
Page 708: Figure D.3 Sample Response To Sho Dnp Command
1 second rate. All events generated during a scan use the time the scan was initiated. Configurable Data One of the most powerful features of the SEL-751 implementation is the ability to remap DNP3 data and, for analog values, specify per-point scaling Mapping and dead bands.
Page 709: Figure D.4 Port Map Command
INDEX POINT LABEL EVENT CLASS SER TIMESTAMP ENABLED TRIP_LED TLED_01 TLED_02 … IN101 IN102 50P1P Binary Outputs -------------------------------------------------------------------------------- INDEX POINT LABEL RB01 RB02 RB03 … RB30 RB31 RB32 Figure D.4 Port MAP Command Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 710 0–3 (inclusive), which indicates the number of decimal place shifts. In other words, you should select 0 to multiply by 1, 1 for 10, 2 for 100, or 3 for 1000. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 711: Table D.13 Sample Custom Dnp3 Ai Map
? > IN_MAG <Enter> AI_04 := NA ? > P:5 <Enter> AI_05 := NA ? > VAB_MAG <Enter> AI_06 := NA ? > VAB_ANG:1:15 <Enter> Figure D.5 Sample Custom DNP3 AI Map Settings Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 712: Figure D.7 Ai Point Label, Scaling And Deadband In
The SET DNP x AO_00<Enter> command allows you to populate the DNP analog output map with any of the 128 Remote Analogs (RA001–RA128) or the GROUP variable (present settings group) as shown in Figure D.8. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 713: Figure D.8 Sample Custom Dnp3 Ao Map Settings
Figure D.10. You can populate the custom BO map with any of the 32 remote bits (RB01–RB32). You can define bit pairs in BO maps by including a colon (:) between the bit labels. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 714: Figure D.10 Sample Custom Dnp3 Bo Map Settings
Figure D.11. Figure D.11 Binary Output Map Entry in QuickSet Software ERATOR The binary input (BI) maps are modified in a similar manner, but pairs are not allowed. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 715 Enable Modbus TCP protocol with the optional Ethernet port settings. The SEL-751 supports as many as two Modbus TCP sessions. The TCP port number for each session is selected with the Ethernet port settings. The default TCP port number is the Modbus TCP registered port 502. Modbus TCP uses the device IP address as the Modbus identifier and accesses the data in the relay using the same function codes and data maps as Modbus RTU.
Page 716: Table E.1 Modbus Query Fields
Cyclical Redundancy Check (CRC) 2 bytes The SEL-751 SLAVEID setting defines the device address. Set this value to a unique number for each device on the Modbus network. For Modbus communication to operate properly, no two slave devices can have the same address.
Page 717: Table E.3 Sel-751 Modbus Exception Codes
2000 bits per query, using the fields shown in Table E.4. Note that the Command SEL-751 coil addresses start at 0 (e.g., Coil 1 is located at address zero). The coil status is packed one coil per bit of the data field. The Least Significant Bit (LSB) of the first data byte contains the starting coil address in the query.
Page 718: Table E.4 01H Read Discrete Output Coil Status Command
2 bytes CRC-16 To build the response, the SEL-751 calculates the number of bytes necessary to contain the number of bits requested. If the number of bits requested is not evenly divisible by eight, the device adds one more byte to maintain the balance of bits, padded by zeros to make an even byte.
Page 719: Table E.7 02H Sel-751 Inputs
Table E.7 includes the coil address in decimal and lists all possible inputs (Relay Word bits) available in the device. Note that the command depends on the device hardware configuration; the device responds only to installed cards. Table E.7 02h SEL-751 Inputs Coil Address (Decimal) Function Code Supported Coil Description 0–7...
Page 720: Table E.8 Responses To 02H Read Input Query Errors
Register Command function code. Most masters use 3X references with this function code. If you are accustomed to 3X references with this function code, for five-digit addressing, add 30001 to the standard database address. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 721: Table E.11 04H Read Input Register Command
2 bytes CRC-16 Table E.14 lists the coil numbers supported by the SEL-751. The physical coils (coils 0–26) are self-resetting. Pulsing a Set remote bit (decimal address 59 through 90) causes the remote bit to be cleared at the end of the pulse.
Page 722: Table E.14 01H, 05H Sel-751 Output
Modbus RTU Communications Communications Protocol Table E.14 01h, 05h SEL-751 Output (Sheet 1 of 3) Coil Address (Decimal) Function Code Supported Coil Description 01, 05 Pulse OUT101 1 second 01, 05 Pulse OUT102 1 second 01, 05 Pulse OUT103 1 second...
Page 723 Modbus RTU Communications Communications Protocol Table E.14 01h, 05h SEL-751 Output (Sheet 2 of 3) Coil Address (Decimal) Function Code Supported Coil Description 01, 05 RB12 01, 05 RB13 01, 05 RB14 01, 05 RB15 01, 05 RB16 01, 05...
Page 724: Table E.15 Responses To 05H Force Single Coil Query Errors
Illegal Data Value (03h) Bad Packet Format 06h Preset Single The SEL-751 uses this function to allow a Modbus master to write directly to a database register. Refer to the Modbus Register Map in Table E.34 for a list Register Command of registers that you can write by using this function code.
Page 725: Table E.17 Responses To 06H Preset Single Register Query Errors
Illegal Data Value (03h) Bad Packet Format 08h Loopback The SEL-751 uses this function to allow a Modbus master to perform a diagnostic test on the Modbus communications channel and relay. When the Diagnostic Command subfunction field is 0000h, the relay returns a replica of the received message.
Page 726: Table E.20 10H Preset Multiple Registers Command
Invalid register data value Illegal Data Value (03h) Illegal Write 60h Read Parameter The SEL-751 uses this function to allow a Modbus master to read parameter information from the relay. One parameter (setting) is read in each query. Information Command Table E.22 60h Read Parameter Information Command (Sheet 1 of 2)
Page 727: Table E.23 60H Read Parameter Descriptor Field Definition
Table E.24 60h Read Parameter Conversion Field Definition (Sheet 1 of 2) Conversion Type Multiplier Divisor Offset Base Value Boolean Unsigned Integer Unsigned Integer Unsigned Integer Unsigned Integer 1000 Hexidecimal Integer Integer Integer Integer 1000 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 728: Table E.25 Responses To 60H Read Parameter Information Query Errors
Illegal Address (02h) Invalid Address 61h Read Parameter The SEL-751 uses this function to allow a Modbus master to read parameter text from the relay. One parameter text (setting name) is read in each query. Text Command Table E.26 61h Read Parameter Text Command...
Page 729: Table E.27 61H Read Parameter Text Query Error Messages
Illegal parameter to read Illegal Address (02h) Invalid Address 62h Read The SEL-751 uses this function to allow a Modbus master to read parameter enumeration or bit enumeration values (setting lists) from the relay. One Enumeration parameter enumeration is read in each query.
Page 730: Table E.31 7Dh Encapsulated Packet Query Errors
An example of a 7D message response using 7E will have the following format: 1 byte Slave Address 1 byte Function Code (7Dh) 2 bytes Status Information 1 byte Function Code (7Eh) 2 bytes CRC-16 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 731 Use the 60h, 61h, and 62h commands to retrieve parameter information, and use the 03 command to retrieve values. Controlling Output The SEL-751 includes registers for controlling some of the outputs. See LOGIC COMMAND (2000h), RESET COMMAND (2001h), and registers in Contacts Using the Reset Settings region for the control features supported by the relay.
Page 732: Table E.33 Modbus Register Labels For Use With Set M Command
MV10H MWH3PIL AI308L IN_ANG VSRMS MV10L MWH3POH AI401H IG_MAG 441–449 MV11H MWH3POL AI401L IG_ANG MV11L MVRH3PIH AI402H I1_MAG MV12H MVRH3PIL AI402L I1_ANG MV12L MVRH3POH AI403H MV13H MVRH3POL AI403L 3I2D MV13L MVAH3PH AI404H IAPD SEL-751 Relay Instruction Manual Date Code 20170927...
Page 733 RA066_H RA092_H RA014_H SC09 RA040_L RA066_L RA092_L RA014_L SC10 RA041_H RA067_H RA093_H RA015_H SC11 RA041_L RA067_L RA093_L RA015_L SC12 RA042_H RA068_H RA094_H RA016_H SC13 RA042_L RA068_L RA094_L RA016_L SC14 RA043_H RA069_H RA095_H RA017_H Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 734 1035 KW3NMN ICX_H 1094 RTD1X_D RA119_L VBCMX 1036 KW3N_H ICX_D 1095 RTD1XMO RA120_H VBCX_S 1037 KW3N_D ICXMO 1096 RTD1X_Y RA120_L VBCXMN 1038 KW3NMO ICX_Y 1097 RTD1MN RA121_H VBCX_H 1039 KW3N_Y ICMN 1098 RTD1N_S SEL-751 Relay Instruction Manual Date Code 20170927...
Page 735 AI307MXH 1314 AI303N_H 1148 RTD5XMN 1200 RTD8NMO 1252 RTD12N_S 1367 AI307MXL 1315 AI303N_D 1149 RTD5X_H 1201 RTD8N_Y 1253 RTD12NMN 1368 AI307X_S 1316 AI303NMO 1150 RTD5X_D 1202 RTD9MX 1254 RTD12N_H 1369 AI307XMN 1317 AI303N_Y Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 736 AI504MXH 1626 AI507X_H 1419 AI402X_D 1471 AI405MNL 1523 AI408N_D 1575 AI504MXL 1627 AI507X_D 1420 AI402XMO 1472 AI405N_S 1524 AI408NMO 1576 AI504X_S 1628 AI507XMO 1421 AI402X_Y 1473 AI405NMN 1525 AI408N_Y 1577 AI504XMN 1629 AI507X_Y SEL-751 Relay Instruction Manual Date Code 20170927...
Page 737 1691 NUMEVE 1766 ROW_6 1818 ROW_58 1869 ROW_109 1920 1692 EVESEL 1767 ROW_7 1819 ROW_59 1870 ROW_110 1921 ROW_160 1693 EVE_S 1768 ROW_8 1820 ROW_60 1871 ROW_111 1922 ROW_161 1694 EVEMN 1769 ROW_9 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 738 ROW_165 1927 ROW_166 1928–1935 All the reserved registers between the data areas in the map may also be assigned to the user registers with a label RES_xxxx where xxxx is the register number. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 739: Table E.34 Modbus Register Map
125 (R/W) USER REG #125 1935 1920 User Map Register Values 126 (R) USER REG#1 VAL 65535 • • • 250 (R) USER REG#125 VAL 65535 Reserved Area 1 251–260 (R) Reserved 351–360 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 740 295 (R) +3.3V STATUS 296 (R) +3.75V STATUS 297 (R) +5.0V STATUS 298 (R) -1.25V STATUS 299 (R) -5.0V STATUS 300 (R) CLK_BAT STATUS 301 (R) CARD C STATUS 302 (R) CARD D STATUS SEL-751 Relay Instruction Manual Date Code 20170927...
Page 741 AVERAGE LINE 65535 0.01 342 (R) 65535 0.01 343 (R) V1 ANGLE -1800 1800 344 (R) 65535 0.01 345 (R) VAN ANGLE -1800 1800 346 (R) 65535 0.01 347 (R) VBN ANGLE -1800 1800 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 742 65535 0.001 388 (R) MVAH3P HI MVAh 65535 0.001 389 (R) MVAH3P LO MVAh 65535 0.001 390 (R) LAST RST TIME-ss 5999 0.01 391 (R) LAST RST TIME-mm 392 (R) LAST RST TIME-hh SEL-751 Relay Instruction Manual Date Code 20170927...
Page 743 432 (R) IC RMS 65535 433 (R) IN RMS 65535 434 (R) VA RMS 65535 0.01 435 (R) VB RMS 65535 0.01 436 (R) VC RMS 65535 0.01 437 (R) VAB RMS 65535 0.01 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 744 9999 2000 487–489 (R) Reserved 587–589 Analog Input Data 490 (R) AI301 - HI -32768 32767 0.001 491 (R) AI301 - LO -32768 32767 0.001 492 (R) AI302 - HI -32768 32767 0.001 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 745 0.001 532 (R) AI506 - HI -32768 32767 0.001 533 (R) AI506 - LO -32768 32767 0.001 534 (R) AI507 - HI -32768 32767 0.001 535 (R) AI507 - LO -32768 32767 0.001 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 746 0.01 577 (R) MV19 - LO -32768 32767 0.01 578 (R) MV20 - HI -32768 32767 0.01 579 (R) MV20 - LO -32768 32767 0.01 580 (R) MV21 - HI -32768 32767 0.01 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 747 653 (R/W) RA007 (1:LW) -32768 32767 0.01 654 (R/W) RA008 (0:UW) -32768 32767 0.01 655 (R/W) RA008 (1:LW) -32768 32767 0.01 656 (R/W) RA009 (0:UW) -32768 32767 0.01 657 (R/W) RA009 (1:LW) -32768 32767 0.01 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 748 698 (R/W) RA030 (0:UW) -32768 32767 0.01 699 (R/W) RA030 (1:LW) -32768 32767 0.01 700 (R/W) RA031 (0:UW) -32768 32767 0.01 701 (R/W) RA031 (1:LW) -32768 32767 0.01 702 (R/W) RA032 (0:UW) -32768 32767 0.01 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 749 743 (R/W) RA052 (1:LW) -32768 32767 0.01 744 (R/W) RA053 (0:UW) -32768 32767 0.01 745 (R/W) RA053 (1:LW) -32768 32767 0.01 746 (R/W) RA054 (0:UW) -32768 32767 0.01 747 (R/W) RA054 (1:LW) -32768 32767 0.01 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 750 788 (R/W) RA075 (0:UW) -32768 32767 0.01 789 (R/W) RA075 (1:LW) -32768 32767 0.01 790 (R/W) RA076 (0:UW) -32768 32767 0.01 791 (R/W) RA076 (1:LW) -32768 32767 0.01 792 (R/W) RA077 (0:UW) -32768 32767 0.01 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 751 833 (R/W) RA097 (1:LW) -32768 32767 0.01 834 (R/W) RA098 (0:UW) -32768 32767 0.01 835 (R/W) RA098 (1:LW) -32768 32767 0.01 836 (R/W) RA099 (0:UW) -32768 32767 0.01 837 (R/W) RA099 (1:LW) -32768 32767 0.01 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 752 878 (R/W) RA120 (0:UW) -32768 32767 0.01 879 (R/W) RA120 (1:LW) -32768 32767 0.01 880 (R/W) RA121 (0:UW) -32768 32767 0.01 881 (R/W) RA121 (1:LW) -32768 32767 0.01 882 (R/W) RA122 (0:UW) -32768 32767 0.01 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 753 IB MIN TIME mm 1023 924 (R) IB MIN TIME hh 1024 925 (R) IB MIN DAY dd 1025 926 (R) IB MIN DAY mm 1026 927 (R) IB MIN DAY yy 2000 9999 2000 1027 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 754 969 (R) IG MIN DAY yy 2000 9999 2000 1069 970 (R) VAB MAX 65535 0.01 1070 971 (R) VAB MX TIM ss 5999 0.01 1071 972 (R) VAB MX TIM mm 1072 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 755 VS MAX TIME ss 5999 0.01 1113 1014 (R) VS MAX TIME mm 1114 1015 (R) VS MAX TIME hh 1115 1016 (R) VS MAX DAY dd 1116 1017 (R) VS MAX DAY mm 1117 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 756 1059 (R) KVA3P MX DAY mm 1159 1060 (R) KVA3P MX DAY yy 2000 9999 2000 1160 1061 (R) KVA3P MIN -32768 32767 1161 1062 (R) KVA3P MN TIM ss 5999 0.01 1162 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 757 1110 (R) RTD2 MX DAY yy 2000 9999 2000 1210 ° 1111 (R) RTD2 MIN -32768 32767 1211 1112 (R) RTD2 MN TIM ss 5999 0.01 1212 1113 (R) RTD2 MN TIM mm 1213 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 758 RTD5 MN TIM ss 5999 0.01 1254 1155 (R) RTD5 MN TIM mm 1255 1156 (R) RTD5 MN TIM hh 1256 1157 (R) RTD5 MN DAY dd 1257 1158 (R) RTD5 MN DAY mm 1258 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 759 1200 (R) RTD8 MN DAY mm 1300 1201 (R) RTD8 MN DAY yy 2000 9999 2000 1301 ° 1202 (R) RTD9 MAX -32768 32767 1302 1203 (R) RTD9 MX TIM ss 5999 0.01 1303 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 760 -32768 32767 1344 1245 (R) RTD12 MX TIM ss 5999 0.01 1345 1246 (R) RTD12 MX TIM mm 1346 1247 (R) RTD12 MX TIM hh 1347 1248 (R) RTD12 MX DAY dd 1348 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 761 AI302 MN DAY mm 1400 1301 (R) AI302 MN DAY yy 2000 9999 2000 1401 1302 (R) AI303 MX - HI -32768 32767 0.001 1402 1303 (R) AI303 MX - LO -32768 32767 0.001 1403 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 762 AI305 MN TIM ss 5999 0.01 1444 1345 (R) AI305 MN TIM mm 1445 1346 (R) AI305 MN TIM hh 1446 1347 (R) AI305 MN DAY dd 1447 1348 (R) AI305 MN DAY mm 1448 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 763 AI308 MX DAY mm 1488 1389 (R) AI308 MX DAY yy 2000 9999 2000 1489 1390 (R) AI308 MN - HI -32768 32767 0.001 1490 1391 (R) AI308 MN - LO -32768 32767 0.001 1491 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 764 1431 (R) AI403 MX - LO -32768 32767 0.001 1531 1432 (R) AI403 MX TIM ss 5999 0.01 1532 1433 (R) AI403 MX TIM mm 1533 1434 (R) AI403 MX TIM hh 1534 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 765 AI405 MN DAY mm 1576 1477 (R) AI405 MN DAY yy 2000 9999 2000 1577 1478 (R) AI406 MX - HI -32768 32767 0.001 1578 1479 (R) AI406 MX - LO -32768 32767 0.001 1579 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 766 1519 (R) AI408 MN - LO -32768 32767 0.001 1619 1520 (R) AI408 MN TIM ss 5999 0.01 1620 1521 (R) AI408 MN TIM mm 1621 1522 (R) AI408 MN TIM hh 1622 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 767 1563 (R) AI503 MX DAY dd 1663 1564 (R) AI503 MX DAY mm 1664 1565 (R) AI503 MX DAY yy 2000 9999 2000 1665 1566 (R) AI503 MN - HI -32768 32767 0.001 1666 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 768 -32768 32767 0.001 1707 1608 (R) AI506 MX TIM ss 5999 0.01 1708 1609 (R) AI506 MX TIM mm 1709 1610 (R) AI506 MX TIM hh 1710 1611 (R) AI506 MX DAY dd 1711 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 769 AI508 MN TIM mm 1749 1650 (R) AI508 MN TIM hh 1750 1651 (R) AI508 MN DAY dd 1751 1652 (R) AI508 MN DAY mm 1752 1653 (R) AI508 MN DAY yy 2000 9999 2000 1753 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 770 1793 1694 (R) EVENT TIME mm 1794 1695 (R) EVENT TIME hh 1795 1696 (R) EVENT DAY dd 1796 1697 (R) EVENT DAY mm 1797 1698 (R) EVENT DAY yy 9999 2000 1798 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 771 -32768 32767 1815 ° 1716 (R) EVNT MAX OTH RTD -32768 32767 1816 1717 (R) FAULT IMP MAG 65535 0.01 1817 1718 (R) FAULT IMP ANGLE –18000 18000 0.01 1818 1719–1729 (R) Reserved 1819–1829 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 772 ILLEGAL FUNCTION 65535 1845 1746 (R) ILLEGAL REGISTER 65535 1846 1747 (R) ILLEGAL WRITE 65535 1847 1748 (R) BAD PKT FORMAT 65535 1848 1749 (R) BAD PKT LENGTH 65535 1849 1750–1759 (R) Reserved 1850–1859 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 773 TRIP STATUS LO 2103H (R) TRIP STATUS HI 2104H (R) WARN STATUS LO 2105H (R) WARN STATUS HI 2106H (R) AVERAGE CURRENT 2107H (R) IA CURRENT 2108H (R) IB CURRENT 2109H (R) IC CURRENT Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 774 BREAKER MONITOR 3010H (R) ANA INP DATA 3011H (R) MATH VARIABLES 3012H (R) DEVICE COUNTERS 3013H (R) REMOTE ANALOGS1 3014H (R) REMOTE ANALOGS2 3015H (R) RESERVED AREA6 3016H (R) MAX/MIN MTR DATA 1089 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 775 LANGUAGE CODE 0 = English 1 = French 2 = Spanish (Mexican) 3 = Italian 4 = German 5 = Japanese 6 = Portuguese 7 = Mandarin Chinese 8 = Russian 9 = Dutch Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 776 Registers labeled (R/W) are read-write registers. Registers labeled (W) are write-only registers. Registers Labeled (R) are read-only registers. Reserved addresses return 0. Read this register only when the PT connection is DELTA. Read this register only when the PT connection is WYE. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 777: Features
Appendix F IEC 61850 Communications Features The SEL-751 Relay uses Ethernet and IEC 61850 to support the following features: ➤ SCADA—Connect as many as seven simultaneous IEC 61850 MMS client sessions. The SEL-751 also supports as many as seven buffered and seven unbuffered report control blocks. See Table F.22: Logical Device: CON (Remote Control) for Logical...
Page 778: Table F.1 Iec 61850 Document Set
SCSM-Mapping to Manufacturing Messaging Specification (MMS) (ISO/IEC 9506-1 and ISO/IEC 9506-2 over ISO/IEC 8802-3) IEC 61850-9-1 SCSM-Sampled values over serial multidrop point-to-point link IEC 61850-9-2 SCSM-Sampled values over ISO/IEC 8802-3 IEC 61850-10 Conformance testing SEL-751 Relay Instruction Manual Date Code 20170927...
Page 779: Iec 61850 Operation
IEC 61850 Operation Ethernet Networking IEC 61850 and Ethernet networking are available as options in the SEL-751. In addition to IEC 61850, the Ethernet port provides support protocols and data exchange, including FTP and Telnet. Access the SEL-751 Port 1 settings to configure all of the Ethernet settings, including IEC 61850 enable settings.
Page 780: Table F.2 Example Iec 61850 Descriptor Components
Device data are mapped to IEC 61850 logical nodes (LN) according to rules SEL has defined. Refer to IEC 61850-5:2013(E) and IEC 61850-7-4:2010(E) for the mandatory content and usage of these LNs. The SEL-751 logical nodes are grouped under Logical Devices for organization based on function. See Table F.3 for descriptions of the Logical Devices in an SEL-751.
Page 781 If MMS authentication is enabled, the device authenticates each MMS association by requiring the client to provide the password authentication parameter with a value that is equal to the 2AC password of the SEL-751. ➤ If the correct password authentication parameter is not received, the device returns a not authenticated error code.
Page 782: Figure F.1 Sel-751 Datasets
Logical Nodes for the logical node tables that list the available data attributes for each logical node and the Relay Word bit mapping for these data attributes. The datasets listed in Figure F.1 are the defaults for an SEL-751 device. Datasets BRDSet01–BRDSet07 and URDSet01–URDSet07 are preconfigured with common FCDAs to be used for reporting.
Page 783: Figure F.2 Sel-751 Predefined Reports
MMS clients. Reports The SEL-751 supports buffered and unbuffered report control blocks in the report model as defined in IEC 61850-8-1:2004(E). The predefined reports shown in Figure F.2 are available by default via IEC 61850. There are 14 report control blocks, seven buffered reports and seven unbuffered.
Page 784: Table F.4 Buffered Report Control Block Client Access
BRCB until the connection is closed or the client disables the RptEna attribute. Once enabled, all unassociated clients have read only access to the BRCB. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 785 (e.g., an internal self-test failure), the SEL-751 sets the Validity attribute to invalid and the Failure attribute to TRUE. Note that the SEL-751 does not set any of the other quality attributes. These attributes always indicate FALSE (0). See the Architect online help for additional information on GOOSE Quality attributes.
Page 786: Figure F.3 Goose Quality
Each outgoing GOOSE includes communications parameters (VLAN, Priority, and Multicast Address) and is transmitted entirely in a single network frame. ➤ The SEL-751 maintains the configuration of outgoing GOOSE through a power cycle and device reset. SEL-751 Relay Instruction Manual...
Page 787: Table F.6 Iec 61850 Settings
IEC 61850 Configuration Incoming GOOSE messages are processed within the following constraints: ➤ You can configure the SEL-751 to subscribe to as many as 64 incoming GOOSE messages. The SEL-751 recognizes incoming GOOSE messages as valid based on the following content. Any GOOSE message that fails these checks is rejected.
Page 788 ICD version(s) for your needs. Architect generates CID files from ICD files, so the ICD file version Architect uses also determines the CID file version generated. Details about the different SEL-751 ICD files can be found in Table A.7.
Page 789: Table F.7 New Logical Node Extensions
The name shall be composed of the class name, the LN-Prefix, and the LN-Instance-ID (according to IEC 61850-7-2). Common Logical Node Information LN shall inherit all Mandatory Data from Common Logical Node Class. EEHealth External equipment health (RTD Communications Status) Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 790: Table F.10 Thermal Element Metering Data Logical Node Class Definition
Transient data objects—the status of data objects with this designation is momentary and must be logged or reported to provide evidence of their momentary state M: Mandatory; O: Optional; C: Conditional; E: Extension SEL-751 Relay Instruction Manual Date Code 20170927...
Page 791: Table F.11 Metering Statistics Logical Node Class Definition
LN-Instance-ID (according to IEC 61850-7-2). Common Logical Node Information LN shall inherit all Mandatory Data from Common Logical Node Class. Data Objects Measured Values DmdA Phase Demand Currents DmdAnseq Negative-Sequence Demand Current Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 792: Table F.13 Compatible Logical Nodes With Extensions
Transient data objects—the status of data objects with this designation is momentary and must be logged or reported to provide evidence of their momentary state. M: Mandatory; O: Optional; C: Conditional; E: Extension. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 793: Table F.15 Circuit Breaker Logical Node Class Definition
Transient data objects—the status of data objects with this designation is momentary and must be logged or reported to provide evidence of their momentary state. M: Mandatory; O: Optional; C: Conditional; E: Extension. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 794: Table F.17 Measurement Logical Node Class Definition
The name shall be composed of the class name, the LN-Prefix, and the LN-Instance-ID (according to IEC 61850-7-2). Common Logical Node Information LN shall inherit all Mandatory Data from Common Logical Node Class. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 795: Table F.20 Logical Device: Pro (Protection)
Logical Nodes The following tables, Table F.20 through Table F.24, show the Logical Nodes (LN) supported in the SEL-751 and the associated Relay Word bits or measured quantities. Table F.20 shows the LN associated with protection elements defined as Logical Device PRO.
Page 796 Level 2 trip definite time over-/underfrequency elements D2TPTOF2 Str.dirGeneral unknown Direction undefined D3TPTOF3 Op.general 81D3T Level 3 trip definite time over-/underfrequency elements D3TPTOF3 Str.general 81D3T Level 3 trip definite time over-/underfrequency elements D3TPTOF3 Str.dirGeneral unknown Direction undefined SEL-751 Relay Instruction Manual Date Code 20170927...
Page 797 Level 2 residual ground instantaneous overcurrent element trip G2TPIOC10 Str.general 50G2P Level 2 residual ground instantaneous overcurrent element pickup G2TPIOC10 Str.dirGeneral unknown Direction undefined G2TPTOC18 Op.general 51G2T Level 2 residual ground time-overcurrent element trip Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 798 HIF1_A OR HIF1_B OR HIF1_C HIZPHIZ1 Str.dirGeneral unknown Direction undefined HIZPHIZ2 Op.phsA HIF2_A A-phase HIF detection HIZPHIZ2 Op.phsB HIF2_B B-phase HIF detection HIZPHIZ2 Op.phsC HIF2_C C-phase HIF detection HIZPHIZ2 Op.general OREDHIF2 HIF2_A OR HIF2_B OR HIF2_C SEL-751 Relay Instruction Manual Date Code 20170927...
Page 799 S, direction (LZREV = false, direction unknown; LZREV = true, direction reverse) N1TPIOC5 Op.general 50N1T Level 1 neutral ground instantaneous overcurrent element trip N1TPIOC5 Str.general 50N1P Level 1 neutral ground instantaneous overcurrent element pickup N1TPIOC5 Str.dirGeneral unknown Direction undefined Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 800 Level 1 phase undervoltage element pickup P1TPTUV1 Str.dirGeneral unknown Direction undefined P2TPIOC2 Op.general 50P2T Level 2 phase instantaneous overcurrent element trip P2TPIOC2 Str.general 50P2P Level 2 phase instantaneous overcurrent element pickup P2TPIOC2 Str.dirGeneral unknown Direction undefined SEL-751 Relay Instruction Manual Date Code 20170927...
Page 801 Direction unknown due to settings P67G4PTOC11 Op.general 67G4T Level 4 residual ground directional overcurrent trip P67G4PTOC11 Str.general 67G4P Level 4 residual ground directional overcurrent pickup P67G4PTOC11 Str.dirGeneral unknown Direction unknown due to settings Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 802 Str.dirGeneral unknown Direction unknown due to settings P67Q3PTOC9 Op.general 67Q3T Level 3 negative-sequence directional overcurrent trip P67Q3PTOC9 Str.general 67Q3P Level 3 negative-sequence directional overcurrent pickup P67Q3PTOC9 Str.dirGeneral unknown Direction unknown due to settings SEL-751 Relay Instruction Manual Date Code 20170927...
Page 803 PWFRDIR1 Dir.general FDIRW Forward directional output for Petersen coil wattmetric element PWFRDIR1 Dir.dirGeneral FDIRW?0:1 Forward directional output for Petersen coil wattmetric elements, direction (FDIRW = false, direction unknown; FDIRW = true, direction forward) Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 804 Level 3 negative-sequence instantaneous overcurrent element pickup Q3TPIOC15 Str.dirGeneral unknown Direction undefined Q4TPIOC16 Op.general 50Q4T Level 4 negative-sequence instantaneous overcurrent element trip Q4TPIOC16 Str.general 50Q4P Level 4 negative-sequence instantaneous overcurrent element pickup Q4TPIOC16 Str.dirGeneral unknown Direction undefined SEL-751 Relay Instruction Manual Date Code 20170927...
Page 805 Level 1 VS channel overvoltage element pickup S1TPTOV6 Str.dirGeneral unknown Direction undefined S1TPTUV7 Op.general 27S1T Level 1 VS channel undervoltage element with time delay S1TPTUV7 Str.general 27S1 Level 1 VS channel undervoltage element pickup S1TPTUV7 Str.dirGeneral unknown Direction undefined Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 806 Arc-Flash Light Input 7 element pickup TOL7PAFD3 Str.dirGeneral unknown Direction undefined TOL8PAFD4 Op.general TOL8 Arc-Flash Light Input 8 element pickup TOL8PAFD4 Str.general TOL8 Arc-Flash Light Input 8 element pickup TOL8PAFD4 Str.dirGeneral unknown Direction undefined SEL-751 Relay Instruction Manual Date Code 20170927...
Page 807: Table F.21 Logical Device: Met (Metering)
PkDmdA.phsC.instCVal.mag.f ICPD C-phase current peak demand METMDST1 PkDmdA.res.instCVal.mag.f IGPD Residual current peak demand METMDST1 SupVArh.actVal MVARH3PI Reactive energy, three-phase IN METMDST1 SupWh.actVal MWH3PI Three-phase real energy IN METMMXU1 A.phsA.instCVal.ang.f IA_ANG Current, A-phase, angle Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 808 Apparent power, three-phase, magnitude METMMXU1 TotVAr.instMag.f Reactive power, three-phase, magnitude METMMXU1 TotW.instMag.f Real power, three-phase, magnitude METMMXU1 VA.phsA.instCVal.mag.f Apparent power, A-phase, magnitude METMMXU1 VA.phsB.instCVal.mag.f Apparent power, B-phase, magnitude METMMXU1 VA.phsC.instCVal.mag.f Apparent power, C-phase, magnitude SEL-751 Relay Instruction Manual Date Code 20170927...
Page 809 INMX Current, neutral, maximum magnitude METMSTA1 MaxP2PV.phsAB.instCVal.mag.f VABMX Voltage, A-to-B-phase, maximum magnitude METMSTA1 MaxP2PV.phsBC.instCVal.mag.f VBCMX Voltage, B-to-C-phase, maximum magnitude METMSTA1 MaxP2PV.phsCA.instCVal.mag.f VCAMX Voltage, C-to-A-phase, maximum magnitude METMSTA1 MaxPhV.phsA.instCVal.mag.f VAMX Voltage, A-phase-to-neutral, maximum magnitude Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 810 PPV.phsBC.instCVal.mag.f VBCRMS RMS voltage, BC-phase-to-phase, magnitude RMSMMXU2 PPV.phsCA.instCVal.mag.f VCARMS RMS voltage, CA-phase-to-phase, magnitude RMSMMXU2 VSyn.instCVal.mag.f VSRMS Synchronizing voltage, RMS magnitude THERMMTHR1 MaxAmbTmp.instMag.f RTDAMB Ambient RTD temperature THERMMTHR1 MaxBrgTmp.instMag.f RTDBRGMX Maximum bearing RTD temperature SEL-751 Relay Instruction Manual Date Code 20170927...
Page 811: Table F.22 Logical Device: Con (Remote Control)
RB01–RB08 Remote Bits RB01–RB08 SPCSO08.stVal SPCSO08.Oper.ctlVal RBGGIO2 SPCSO09.stVal– SPCSO09.Oper.ctlVal– RB09–RB16 Remote Bits RB09–RB16 SPCSO16.stVal SPCSO16.Oper.ctlVal RBGGIO3 SPCSO17.stVal– SPCSO17.Oper.ctlVal– RB17–RB24 Remote Bits RB17–RB24 SPCSO24.stVal SPCSO24.Oper.ctlVal RBGGIO4 SPCSO25.stVal– SPCSO25.Oper.ctlVal– RB25–RB32 Remote Bits RB25–RB32 SPCSO32.stVal SPCSO32.Oper.ctlVal Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 812: Table F.23 Logical Device: Ann (Annunciation)
Real power, B-phase demand OUT PWRGGIO34 AnIn11.instMag.f KWCDO Real power, C-phase demand OUT PWRGGIO34 AnIn12.instMag.f KW3DO Real power, three-phase demand OUT PWRGGIO34 AnIn13.instMag.f KVARADO Reactive power, A-phase demand OUT PWRGGIO34 AnIn14.instMag.f KVARBDO Reactive power, B-phase demand OUT SEL-751 Relay Instruction Manual Date Code 20170927...
Page 813 2-position Disconnect 1 N/O contact DCSTSGGIO38 Ind02.stVal 89B2P1 2-position Disconnect 1 N/C contact DCSTSGGIO38 Ind03.stVal 89CL2P1 2-position Disconnect 1 closed DCSTSGGIO38 Ind04.stVal 89OP2P1 2-position Disconnect 1 open DCSTSGGIO38 Ind05.stVal 89A2P2 2-position Disconnect 2 N/O contact Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 814 Ind05.stVal ROKB Channel B, received data ok MBOKGGIO32 Ind06.stVal RBADB Channel B, outage duration over threshold MBOKGGIO32 Ind07.stVal CBADB Channel B, channel unavailability over threshold MBOKGGIO32 Ind08.stVal LBOKB Channel B, looped back ok SEL-751 Relay Instruction Manual Date Code 20170927...
Page 815 Pushbutton PB3A LED PBLEDGGIO7 Ind06.stVal PB3B_LED Pushbutton PB3B LED PBLEDGGIO7 Ind07.stVal PB4A_LED Pushbutton PB4A LED PBLEDGGIO7 Ind08.stVal PB4B_LED Pushbutton PB4B LED PBLEDGGIO7 Ind09.stVal PB5A_LED Pushbutton PB5A LED PBLEDGGIO7 Ind10.stVal PB5B_LED Pushbutton PB5B LED Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 816 Directional element for low-impedance grounded or ungrounded/high impedance grounded systems is operating on neutral channel (IN) current IN PROGGIO29 Ind27.stVal 50NF Forward direction neutral overcurrent threshold exceeded PROGGIO29 Ind28.stVal 50NR Reverse direction neutral overcurrent threshold exceeded SEL-751 Relay Instruction Manual Date Code 20170927...
Page 817 Asserts when an open or short circuit condition is detected on any enabled RTD input, or communication with the external RTD module has been interrupted TRIPGGIO28 Ind07.stVal ULTRIP Unlatch (auto reset) trip from SEL equation OGIC TRIPGGIO28 Ind08.stVal WDGTRIP Winding temperature trip Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 818: Table F.24 Logical Device: Cfg (Configuration)
Client Server Value/Comment Client/Server GOOSE/GSE management Only GOOSE, not GSSE Management GSSE Time Sync Table F.26 PICS for T-Profile Support Profile Client Server Value/Comment TCP/IP GOOSE/GSE Only GOOSE, Not GSSE GSSE Time Sync SEL-751 Relay Instruction Manual Date Code 20170927...
Page 819: Table F.27 Mms Service Supported Conformance
Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 820 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 821: Table F.28 Mms Parameter Cbb
Refer to the IEC 61850 standard Part 8-1 for more information. Table F.29 AlternateAccessSelection Conformance Statement AlternateAccessSelection Client-CR Supported Server-CR Supported accessSelection component index indexRange allElements alternateAccess selectAccess component index indexRange allElements Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 822: Table F.30 Variableaccessspecification Conformance Statement
Table F.33 GetVariableAccessAttributes Conformance Statement GetVariableAccessAttributes Client-CR Supported Server-CR Supported Request name address Response mmsDeletable address typeSpecification Table F.34 DefineNamedVariableList Conformance Statement DefineVariableAccessAttributes Client-CR Supported Server-CR Supported Request variableListName listOfVariable variableSpecification alternateAccess Response SEL-751 Relay Instruction Manual Date Code 20170927...
Page 823: Table F.35 Getnamedvariablelistattributes Conformance Statement
Server-CR Supported Request Scope listOfVariableListName domainName Response numberMatched numberDeleted DeleteNamedVariableList-Error GOOSE Services Table F.37 GOOSE Conformance Conformance Subscriber Publisher Value/Comment Statement GOOSE Services SendGOOSEMessage GetGoReference GetGOOSEElementNumber GetGoCBValues SetGoCBValues GSENotSupported GOOSE Control Block (GoCB) Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 824: Table F.38 Acsi Basic Conformance Statement
F.48 IEC 61850 Communications ACSI Conformance Statements ACSI Conformance Statements Table F.38 ACSI Basic Conformance Statement Client/Subscriber Server/Publisher SEL-751 Support Client-Server Roles Server side (of Two-Party Application Association) Client side (of Two-Party Application Association) SCMS Supported SCSM: IEC 61850-8-1 used...
Page 825: Table F.40 Acsi Services Conformance Statement
IEC 61850 Communications F.49 ACSI Conformance Statements Table F.39 ACSI Models Conformance Statement (Sheet 2 of 2) Client/Subscriber Server/Publisher SEL-751 Support M8-1 sequence-number M8-2 report-time-stamp M8-3 reason-for-inclusion M8-4 data-set-name M8-5 data-reference M8-6 BufTm M8-7 IntgPd M8-8 Logging Log control M9-1...
Page 826 F.50 IEC 61850 Communications ACSI Conformance Statements Table F.40 ACSI Services Conformance Statement (Sheet 2 of 4) Client/ Service/ Services AA: TP/MC SEL-751 Support Subscriber Publisher Data (Clause 10) GetDataValues SetDataValues GetDataDirectory GetDataDefinition Data Set (Clause 11) GetDataSetValues SetDataSetValues CreateDataSet...
Page 827 IEC 61850 Communications F.51 ACSI Conformance Statements Table F.40 ACSI Services Conformance Statement (Sheet 3 of 4) Client/ Service/ Services AA: TP/MC SEL-751 Support Subscriber Publisher Generic Substation Event Model (GSE) (Clause 14.3.5.3.4) GOOSE-Control-Block SendGOOSEMessage GetReference GetGOOSEElement Number GetGoCBValues SetGoCBValues...
Page 828 IEC 61850 Communications ACSI Conformance Statements Table F.40 ACSI Services Conformance Statement (Sheet 4 of 4) Client/ Service/ Services AA: TP/MC SEL-751 Support Subscriber Publisher YES (for IRIG-B) YES (for IRIG-B) YES (for IRIG-B) Supported Time Stamp 7 (10 ms) for SNTP resolution (nearest negative 18 (4 µs) for IRIG-B...
Page 829: Table G.1 Iec 60870-5 Standard Documents
Appendix G IEC 60870-5-103 Communications Instruction Manual Overview The SEL-751 Feeder Protection Relay provides the IEC 60870-5-103 inter- face for direct serial connections to the device. This section covers the following topics: ➤ Introduction to IEC 60870-5-103 ➤ IEC 60870-5-103 in the SEL-751 ➤...
Page 830: Table G.2 Iec 60870-5 Enhanced Performance Architecture Model
Network Access For TCS101 Using Standard Transport Profiles IEC 60870-5-101 Ed 2 Addendums Incorporated In Standard IEC 60870-5-104 Ed 2 Addendums Incorporated In Standard IEC 60870-5-601 Conformance Test Procedures For TCS 101 IEC 60870-5-604 Conformance Test Procedures For TCS 104 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 831: Table G.4 Sel-751 Asdu Types
• Four Octet Binary Time Defined in 60870-5-103, 7.2.6.28 Table G.5 lists the available category map settings in the SEL-751. When configuring the settings with the command line, categories can be selected by entering “>” or “<”. Date Code 20170927...
Page 832: Table G.5 Iec 60870-5-103 Category Map Settings
0–255 103MQ00 103 Meter Quantity Label 0.000–99999 0–255 0–255 103MQ01 – – – – – – – – – – – – – – – 103 Meter Quantity Label 0.000–99999 0–255 0–255 103MQ31 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 833: Table G.6 Iec 60870-5-103 Cause Of Transmission
IEC 60870-5-103 Communications Introduction to IEC 60870-5-103 Cause of Transmission The Cause of Transmission (COT) represents the reason the SEL-751 sends a message to the Master. See Table G.6 for the possible COTs. Table G.6 IEC 60870-5-103 Cause Of Transmission...
Page 834: Table G.8 Iec 60870-5-103 Standard Function Types
1,7,9,11,12,20,21 128, 160, 176, 192 LED Reset – 1,7,11,12,20,21 128, 160, 176, 192 Monitor direction blocked 9,11 128, 160, 176, 192 Test mode 9,11 128, 160, 176, 192 Local parameter setting 9,11 128, 160, 176, 192 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 835 Fault Location X in ohms – Fault forward / line – 128, 160 Fault reverse / busbar – 128, 160 Teleprotection signal transmitted – 128, 160 Teleprotection signal received – 128, 160 Zone 1 – Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 836 Mapped to settings group indications and control in the SEL-751. Mapped to device contact inputs in the SEL-751. Referred to as Binary Targets and other Fault Information in the SEL-751. Referred to as Binary Controls in the SEL-751. SEL-751 Relay...
Page 837: Table G.10 Sel-751 Iec 60870-5-103 Port Settings
2.4 60 Hz Binary Inputs In the SEL-751, binary data are reported as ASDU type 1 (Time Tagged Message). Those points, monitored by the SER function of the device, have their changes reported as COT type 1 (Spontaneous Events). The format of a binary input point within the binary input map is “Label, [INF, FUN].”...
Page 838: Table G.11 Sel-751 Analog Fault Quantities
Binary Targets The binary targets are Relay Word bits within the SEL-751 under row zero. They also appear as LEDs on the front panel of the SEL-751. There are eight binary targets in the SEL-751 namely, ENABLED, TRIP_LED, TLED_01, TLED_02, TLED_03, TLED_04, TLED_05, and TLED_06. In the SEL-751, binary targets are reported as ASDU type 2 (Time Tagged Message with Relative Time) with COT type 1 (Spontaneous Events).
Page 839 “Label, [INF, FUN].” Label represents any valid binary control point accepted by the SEL-751. The INF parameter is an integer in the range of 0 to 255. Similarly, the FUN parameter is an integer in the range of 0 to 255. Label can be entered by itself with the SEL-751 choosing default parameters for INF and FUN.
Page 840: Iec 60870-5-103 Documentation
Master when the command is given, as long as the SEL-751 is not connected to an external time source, e.g., IRIG or SNTP. The SEL-751 sets the internal time validity bit to indicate proper reception of the time synchronization command sequence from the Master.
Page 841: Figure H.1 Devicenet Card Component Overview
DeviceNet card. DeviceNet Card The DeviceNet Card is an optional accessory that enables connection of the SEL-751 to the DeviceNet automation network. The card (see Figure H.1) occupies the communications expansion Slot C in the relay. Node Address Switch: Rotary switch...
Page 842: Features
➤ Rotary switches let you set the node address and network data rate prior to mounting in the SEL-751 and applying power. Alternatively, you can set the switches to positions that allow for configuration of these settings over the DeviceNet network, using a network configuration tool such as RSNetWorx for DeviceNet.
Page 843: Electronic Data Sheet
Table E.34. The parameter numbers are offset by a count of 100 from the register numbers. The EDS file for the SEL-751, SEL-xxxRxxx.EDS, is located on the SEL-751 Product Literature CD, or can also be downloaded from the SEL website at selinc.com.
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Page 845: Overview
The value of synchrophasor data increases greatly when you can share the data over a communications network in real time. A synchrophasor protocol is available in the SEL-751 that allows for a centralized device to collect data efficiently from several phasor measurement units (PMUs). Some possible uses of a system-wide synchrophasor system include the following: ➤...
Page 846: Figure I.1 Phase Reference
10:00:00:016667 Figure I.1 Phase Reference The TSOK Relay Word bit asserts when the SEL-751 has determined that the IRIG-B time source has sufficient accuracy and the synchrophasor data meets the specified accuracy. Synchrophasors are still measured if the time source threshold is not met, as indicated by Relay Word bit TSOK = logical 0.
Page 847: Figure I.2 Waveform At Relay Terminals May Have A Phase Shift
In other words, a power system has a nominal frequency of either 50 or 60 Hz, but on closer examination, it is usually running a little faster or slower than nominal. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 848: Table I.1 Pmu Settings In The Sel-751 For C37.118 Protocol In Global Settings
NONE Set EPMU := Y to access the remaining settings. For the SEL-751 model with the currents only option, the default setting is NA. Certain settings in Table I.1 are hidden, depending on the status of other settings. For example, if PHDATAI := NA, the ICOMP setting is hidden to...
Page 849 Use PHCOMP := N if you are concentrating the SEL-751 synchrophasor data with other PMU data that do not employ frequency compensation. PMSTN and PMID Defines the name and number of the PMU.
Page 850: Table I.2 Synchrophasor Order In Data Stream (Voltages And Currents)
PHDATAV and PHDATAI settings. For example, if PHDATAV := ALL and PHDATAI := I1, selected phase voltages are transmitted first (See PHVOLT setting), followed by VS input voltage, positive-sequence voltage, and positive-sequence current. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 851: Table I.3 User-Defined Analog Values Selected By The Numana Setting
Each of the four Trigger Reason settings, TREA1–TREA4, and the PMU Trigger setting, PMTRIG, are SEL control equations in the Global OGIC settings class. The SEL-751 evaluates these equations and places the results in Relay Word bits with the same names: TREA1–TREA4, and PMTRIG. NOTE: The PM Trigger function is...
Page 852: Table I.5 Sel-751 Serial Port Settings For Synchrophasors
PMTRIG equation should be asserted for a reasonable amount of time, to allow the synchrophasor processor to read the TREA1–TREA4 fields. The SEL-751 automatically sets the TREA1–TREA4 or PMTRIG Relay Word bits based on their default SEL control equation. You must program OGIC these bits to change their operation.
Page 853: Table I.6 Sel-751 Ethernet Port Settings For Synchrophasors
The associated Ethernet port settings are shown in Table I.6. Ethernet port setting EPMIP cannot be set when Global setting EPMU := N. Synchrophasors must be enabled (EPMU := Y) before EPMIP can be set. Table I.6 SEL-751 Ethernet Port Settings for Synchrophasors Setting Description...
Page 854: Figure I.4 Tcp Connection
Synchrophasor data are transmitted whenever new Multicast and Unicast IP addresses. data are read. With this communication scheme, the relay sends a “Synchrophasor Configuration Response 2” once every minute, as shown in Figure I.6. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 855: Table I.7 Synchrophasor Trigger Relay Word Bits
The UDP port numbers must all be unique (See Table M.1). PMOUDP2 Synchrophasor Relay Word Bits Table I.7 and Table I.8 list the SEL-751 Relay Word bits that are related to synchrophasor measurement. The Synchrophasor Trigger Relay Word bits in Table I.7 follow the state of the SEL...
Page 856: Table I.9 Tqual Bits Translation To Time Quality
Synchrophasors Synchrophasor Relay Word Bits The Relay Word bit TSOK provides the indication that the time synchronization is OK. The SEL-751 determines the suitability of the IRIG-B signal for normal accuracy by applying several tests: ➤ Seconds, minutes, and day fields are in range ➤...
Page 857: View Synchrophasors Using The Met Pm Command
This is due to the delay in time qualification (TSOK to assert). View Synchrophasors Using the MET PM Command You can use the MET PM serial port ASCII command to view the SEL-751 synchrophasor measurements. See MET Command (Metering Data) on page 7.42 for general information on the MET command.
Page 858: Figure I.7 Sample Met Pm Command Response
ERATOR QuickSet, and has a similar format to Figure I.7. You can use the MET PM time command to direct the SEL-751 to display the synchrophasor for an exact specified time, in 24-hour format. For example, entering the command MET PM 14:14:12 results in a response similar to Figure I.7 occurring just after 14:14:12, with the time stamp 14:14:12.000.
Page 859: Table I.10 Size Of A C37.118 Synchrophasor Message
0–1 Total (Minimum and Maximum) Table I.11 lists the baud settings available on any SEL-751 serial port (setting SPEED), and the maximum message size that can fit within the port bandwidth. Blank entries indicate bandwidths of less than 20 bytes.
Page 860: Ieee C37.118 Pmu Setting Example
IEEE C37.118 PMU Setting Example A utility is upgrading its distribution system to use the SEL-751 for feeder protection and power-system state measurement. The utility also wants to install phasor measurement units (PMUs) in each substation to collect data to monitor voltages and currents throughout the system.
Page 861 ➤ Indication when the voltage or frequency information is unusable The utility is able to meet the requirements with the SEL-751 for each line, an SEL-2407 Satellite-Synchronized Clock, and an SEL-3373 Phasor Data Concentrator in each substation. This example covers the PMU settings in the SEL-751 Relays. Some system details: ➤...
Page 862: Table I.12 Example Synchrophasor Global Settings
Value PROTO Protocol (SEL, MOD, DNP, EVMSG, PMU, MBA, MBB, MB8A, MB8B, MBTA, MBTB) SPEED Data Speed (300 to 38400) 19200 STOPBIT Stop Bits (1, 2 bits) RTSCTS Enable Hardware Handshaking (Y, N) SEL-751 Relay Instruction Manual Date Code 20170927...
Page 863 The SEL-751 can also indicate when a configuration change occurs, so the synchrophasor processor can request a new configuration block and keep its database up-to-date. The SEL-751 only responds to configuration block request messages when it is in the non-transmitting mode. Date Code 20170927...
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Page 865: Table J.
At IRRORED rates of 9600 bps and faster, the SEL-751 self-paces, using a technique similar to the SEL-400 series pacing mode. There are no settings to enable or disable the self-pacing mode; the SEL-751 automatically enters the self-pacing mode at data rates of 9600, 19200, and 38400.
Page 866: Table J.1 Number Of Mirrored Bits Messages For Different Data Rates
RMBnA and RMBnB relay element bits. Message Decoding Set the RX_ID of the local SEL-751 to match the TX_ID of the remote SEL-751. The SEL-751 provides indication of the status of each M IRRORED...
Page 867: Table J.2 Positions Of The Mirrored Bits
M IRRORED such as an SEL-321 and an SEL-751. The SEL-321 processes power system information each 1/8 power system cycle, but, when transmitting at 19200 bps, the SEL-751 processes M messages at 4.15 ms at...
Page 868 Use the RBADPU setting to determine how long a channel error must last before the meter element RBADA is asserted. RBADA is deasserted when the channel error is corrected. RBADPU is accurate to ±1 second. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 869: Table J.4 Mirrored Bits Communications Message Transmission Period
CBADPU Channel Unavailability to Set CBAD (1–10000 ppm) 1000 RXDFLT 8 char string of 1s, 0s, or Xs XXXXXXXX RMB1PU RMB1 Pickup Debounce Messages (1–8 messages) RMB1DO RMB1 Dropout Debounce Messages (1–8 messages) Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 870 RMB6 Dropout Debounce Messages (1–8 messages) RMB7PU RMB7 Pickup Debounce Messages (1–8 messages) RMB7DO RMB7 Dropout Debounce Messages (1–8 messages) RMB8PU RMB8 Pickup Debounce Messages (1–8 messages) RMB8DO RMB8 Dropout Debounce Messages (1–8 messages) SEL-751 Relay Instruction Manual Date Code 20170927...
Page 871: Table K.1 Sel Ogic Relay Word Bits
Relay Word Bits Overview The protection and control element results are represented by Relay Word bits in the SEL-751 Feeder Protection Relay. Each Relay Word bit has a label name and can be in either of the following states: ➤...
Page 872 SV16T SV17 SV18 SV19 SV20 SV21 SV22 SV23 SV24 SV17T SV18T SV19T SV20T SV21T SV22T SV23T SV24T SV25 SV26 SV27 SV28 SV29 SV30 SV31 SV32 SV25T SV26T SV27T SV28T SV29T SV30T SV31T SV32T SEL-751 Relay Instruction Manual Date Code 20170927...
Page 873 AI507HW1 AI507HW2 AI507HAL AI508LW1 AI508LW2 AI508LAL AI508HW1 AI508HW2 AI508HAL RMB8A RMB7A RMB6A RMB5A RMB4A RMB3A RMB2A RMB1A TMB8A TMB7A TMB6A TMB5A TMB4A TMB3A TMB2A TMB1A RMB8B RMB7B RMB6B RMB5B RMB4B RMB3B RMB2B RMB1B Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 874 TSNTPB TSNTPP 81RFBLK 81RFT 81RFBL 81RFP 81RFI ZLOAD ZLOUT ZLIN VPOLV PHASE_A PHASE_B PHASE_C GFLT INI_HIF HIFITUNE HIFER HIFMODE HIFREC 3PH_EVE HIA1_C HIA1_B HIA1_A HIA2_C HIA2_B HIA2_A HIF1_C HIF1_B HIF1_A HIF2_C HIF2_B HIF2_A SEL-751 Relay Instruction Manual Date Code 20170927...
Page 875 59I2T 59I2RS 59I3 59I3T 59I3RS 59I4 59I4T 59I4RS 89A2P1 89B2P1 89CL2P1 89OP2P1 89A2P2 89B2P2 89CL2P2 89OP2P2 89A2P3 89B2P3 89CL2P3 89OP2P3 89A2P4 89B2P4 89CL2P4 89OP2P4 89A2P5 89B2P5 89CL2P5 89OP2P5 89AL2P1 89AL2P2 89AL2P3 89AL2P4 89AL2P5 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 876: Table K.2 Relay Word Bit Definitions For The Sel-751 Relay
Relay Word Bits Definitions Definitions Table K.2 Relay Word Bit Definitions for the SEL-751 Relay (Sheet 1 of 17) Definition 25A1 Level 1 synchronism check element 25A2 Level 2 synchronism check element 27I1 Level 1 inverse undervoltage element pickup 27I1RS...
Page 877 Relay Word Bits Definitions Table K.2 Relay Word Bit Definitions for the SEL-751 Relay (Sheet 2 of 17) Definition Asserts when VSCONN := 3V0 50A1P Level 1 A-phase instantaneous overcurrent element pickup 50B1P Level 1 B-phase instantaneous overcurrent element pickup...
Page 878 Relay Word Bits Definitions Table K.2 Relay Word Bit Definitions for the SEL-751 Relay (Sheet 3 of 17) Definition 50PDIR Three-phase overcurrent threshold exceeded 50Q1P Level 1 negative-sequence instantaneous overcurrent element pickup 50Q1T Level 1 negative-sequence instantaneous overcurrent element trip...
Page 879 Relay Word Bits Definitions Table K.2 Relay Word Bit Definitions for the SEL-751 Relay (Sheet 4 of 17) Definition 51P1T Level 1 maximum phase time-overcurrent element trip 51P2P Level 2 maximum phase time-overcurrent element pickup 51P2R Level 2 maximum phase time-overcurrent element reset...
Page 880 K.10 Relay Word Bits Definitions Table K.2 Relay Word Bit Definitions for the SEL-751 Relay (Sheet 5 of 17) Definition 59PP2T Level 2 phase-to-phase overvoltage element trip 59Q1 Level 1 negative-sequence instantaneous overvoltage element pickup 59Q1T Level 1 negative-sequence instantaneous overvoltage element trip...
Page 881 Relay Word Bits K.11 Definitions Table K.2 Relay Word Bit Definitions for the SEL-751 Relay (Sheet 6 of 17) Definition 67P4P Level 4 phase directional overcurrent pickup 67P4T Level 4 phase directional overcurrent trip 67Q1P Level 1 negative-sequence directional overcurrent pickup...
Page 882 K.12 Relay Word Bits Definitions Table K.2 Relay Word Bit Definitions for the SEL-751 Relay (Sheet 7 of 17) Definition 89A2P5 2 position disconnect 5 N/O contact 89AL2P1 2 position disconnect 1 alarm 89AL2P2 2 position disconnect 2 alarm 89AL2P3...
Page 883 Relay Word Bits K.13 Definitions Table K.2 Relay Word Bit Definitions for the SEL-751 Relay (Sheet 8 of 17) Definition AIHW2 Analog inputs high warning, Level 2. If any AIxxxHW2 = 1, then AIHW2 = 1. AILAL Analog inputs low alarm limit. If any AIxxxLAL = 1, then AILAL = 1.
Page 884 K.14 Relay Word Bits Definitions Table K.2 Relay Word Bit Definitions for the SEL-751 Relay (Sheet 9 of 17) Definition DI_B B-phase distortion index DI_C C-phase distortion index DIA_DIS A-phase large difference current disturbance DIB_DIS B-phase large difference current disturbance...
Page 885 Relay Word Bits K.15 Definitions Table K.2 Relay Word Bit Definitions for the SEL-751 Relay (Sheet 10 of 17) Definition Event report trigger SEL control equation OGIC FAULT Indicates fault condition. Asserts when SEL control equation FAULT result is logical 1.
Page 886 K.16 Relay Word Bits Definitions Table K.2 Relay Word Bit Definitions for the SEL-751 Relay (Sheet 11 of 17) Definition HBL5BT B-phase fifth-harmonic block timed out HBL5CT C-phase fifth-harmonic block timed out HBL5T Combined-phase fifth-harmonic block timed out HIA1_A A-phase HIF alarm...
Page 887 Relay Word Bits K.17 Definitions Table K.2 Relay Word Bit Definitions for the SEL-751 Relay (Sheet 12 of 17) Definition LB25–LB32 Local bits 25–32 LBOKA Channel A, looped back ok LBOKB Channel B, looped back ok LINK1 Asserted when a valid link is detected on Port 1...
Page 888 K.18 Relay Word Bits Definitions Table K.2 Relay Word Bit Definitions for the SEL-751 Relay (Sheet 13 of 17) Definition OPTMN Open interval timer is timing ORED50T Logical OR of all the instantaneous overcurrent elements tripped outputs ORED51T Logical OR of all the time overcurrent elements tripped outputs...
Page 889 Relay Word Bits K.19 Definitions Table K.2 Relay Word Bit Definitions for the SEL-751 Relay (Sheet 14 of 17) Definition Q1DIR Directional control for element 67Q1P and 51QP Q2DIR Directional control for element 67Q2P Q3DIR Directional control for element 67Q3P...
Page 890 K.20 Relay Word Bits Definitions Table K.2 Relay Word Bit Definitions for the SEL-751 Relay (Sheet 15 of 17) Definition RSTTH3 Thermal Element 3 reset RSTTRGT control equation: reset trip logic and targets when asserted OGIC RTD1A–RTD4A RTD1 through RTD4: alarms and trips RTD1T–RTD4T...
Page 891 Relay Word Bits K.21 Definitions Table K.2 Relay Word Bit Definitions for the SEL-751 Relay (Sheet 16 of 17) Definition SV17T–SV24T control equation variable SV17T through SV24T with settable pickup and dropout OGIC time delay SV25–SV32 control equation variables SV25 through SV32 OGIC SV25T–SV32T...
Page 892 K.22 Relay Word Bits Definitions Table K.2 Relay Word Bit Definitions for the SEL-751 Relay (Sheet 17 of 17) Definition TSOK Assert if current time source accuracy is sufficient for synchronized phasor measurements TUTC1 Offset hours from UTC time, binary, add 1 if asserted...
Page 893: Table L.
Appendix L Analog Quantities The SEL-751 Feeder Protection Relay contains several analog quantities that you can use for more than one function. The actual analog quantities available depend on the part number of the relay you use. Analog quantities are...
Page 894: Table L.1 Analog Quantities
B-phase reactive power kVAR pri C-phase reactive power kVAR pri Three-phase reactive power kVAR pri A-phase power factor B-phase power factor C-phase power factor Three-phase power factor FREQ Frequency FREQS Synch frequency SEL-751 Relay Instruction Manual Date Code 20170927...
Page 895 0 otherwise HIFLRNUM Unique Identification number of the latest HIF event HIFLREP HIF Event Report Present (shall be 1 when an HIF event report is present, and 0 otherwise) Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 896 Three-phase real energy IN MWh pri MWH3PO Three-phase real energy OUT MWh pri MVARH3PI Three-phase reactive energy IN MVARh pri MVARH3PO Three-phase reactive energy OUT MVARh pri MVAH3P Three-phase apparent energy MVAh pri SEL-751 Relay Instruction Manual Date Code 20170927...
Page 897 RTD1MN to RTD12MN RTD1 minimum to RTD12 minimum °C AI301MX to AI308MX Analog transducer input 301–308 maximum AI301MN to AI308MN Analog transducer input 301–308 minimum AI401MX to AI408MX Analog transducer input 401–408 maximum Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 898 (the actual labels used in the Modbus Map are not PM_LRDH, PM_LRDM, PM_LRDL). PM_LRDH Peak demand last reset date/time high word PM_LRDM Peak demand last reset date/time middle word PM_LRDL Peak demand last reset date/time low word SEL-751 Relay Instruction Manual Date Code 20170927...
Page 899 B-phase reference total inter-harmonic content A pri SDICREF C-phase reference total inter-harmonic content A pri ISMA A-phase total odd-harmonic content A pri ISMB B-phase total odd-harmonic content A pri ISMC C-phase total odd-harmonic content A pri Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 900 Note16: FM refers to Fast Message support for Remote Analogs. Remote Analogs can be written by issuing an unsolicited Fast Message Write command. RA001 to RA128 Remote analog 001 to remote analog 128 FREQ and FREQS are set equal to the FNOM setting following a settings change. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 901: Table M.1 Ip Port Numbers
IP Ports When using Ethernet, there are a number of IP ports available within the SEL-751. Many of these IP port numbers are configurable. All IP ports can be disabled. Table M.1 describes each of these. Table M.1 IP Port Numbers...
Page 902 Modbus, or SEL Fast Message. They also may be added to the SER for later analysis or assigned to output contacts for alarm purposes. The SEL-751 SER is a useful tool for capturing a variety of relay events. In addition to capturing state changes of user selected Relay Word bits, it captures all power-ups, settings changes, and group switches.
Page 903 The SEL-751 has inherent and continuous monitoring for Malware. For a full description of this, see selinc.com/mitigating_malware/. Security Vulnerabilities If SEL finds a security vulnerability with the SEL-751, it will be disclosed using our standard security notification process. For a full description of this process, see selinc.com/support/security-notifications/.
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Page 905 S = P + jQ. Arc-Flash Detection The sensing of an arc-flash condition by detection of light and overcurrent by the relay. Clear-Jacketed Fiber Sensor—The fiber optic loop sensor used for arc-flash detection. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 906 To activate; to fulfill the logic or electrical requirements necessary to operate a device. To apply a short-circuit or closed contact to an SEL-751 input. To set a logic condition to the true state (logical 1). To close a normally-open output contact.
Page 907 Deassert To deactivate; to remove the logic or electrical requirements necessary to operate a device. To remove a short-circuit or closed contact from an SEL-751 input. To clear a logic condition to the false state (logical 0). To open a normally-open output contact.
Page 908 Fundamental Meter Type of meter data presented by the SEL-751 that includes the present values measured at the relay ac inputs. The word “Fundamental” is used to indicate that the values are Fundamental Frequency values and do not include harmonics.
Page 909 Relay memory that is able to correctly maintain data it is storing even when the relay is de-energized. Overfrequency Element A protection element that causes the relay to trip when the measured electrical system frequency exceeds a settable frequency. Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 910  Modbus command. Residual Current The sum of the measured phase currents. In normal, balanced operation, this current is very small or zero. When a ground fault occurs, this current can be large. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 911: Date Code
Abbreviation for Resistance Temperature Device. An RTD is made of a metal having a precisely known resistance and temperature coefficient of resistance. The SEL-751 (and the SEL-2600 RTD Module) can measure the resistance of the RTD, and thus determine the temperature at the RTD location. Typically embedded in the motor windings or attached to the races of bearings.
Page 912 Z-Number That portion of the relay RID string that identifies the proper ERATOR QuickSet SEL-5030 software relay driver version when creating or editing relay settings files. SEL-751 Relay Instruction Manual Date Code 20170927...
Page 913: Figure 4.80 Close Logic
COMMUNICATIONS 7.27 connector pinout SEL communications processor C.11 CONTROL 7.28 control characters 7.17 COPY 7.29 DeviceNet protocol 7.12 – COUNTER 7.29 DNP3 Protocol – D.23 DATE 1.12 EIA-232 ports Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 914: Table 7.46 Summary Command
Event mitigation) 4.126 Current Imbalance data capture time 4.207 logic diagram 4.124 percent imbalance equations ER control equation overfrequency 4.123 length 4.207 rate-of-change 4.124 nonvolatile 10.1 underfrequency 4.123 TR initiate 10.3 trigger 10.3 SEL-751 Relay Instruction Manual Date Code 20170927...
Page 915 GOOSE Processing F.10 negative-sequence 4.15 4.19 Introduction to Math Variables 4.158 neutral 4.13 4.20 Logical Nodes F.15 F.19 residual 4.21 Menus Manufacturing Messaging residual, settings 4.15 See Front Panel, menus Specification (MMS) F.43 Date Code 20170927 Instruction Manual SEL-751 Relay...
Page 916 RTD-based protection 4.89 4.90 Software ( QuickSet) ERATOR databases SEL-3373 device editor See Synchrophasors Rack Mounting Accessory expression builder SEL-751 Relay Reactive human machine interface (HMI) 3.13 cleaning chassis xxxiii power measurement convention settings editor features Reactive Power Specifications 1.13 options –...
Page 917 4.97 Troubleshooting 11.16 with SER 11.13 factory assistance 11.17 with targets, LEDs 11.13 setting error messages with terminal 11.12 Z-number Thermal (IEC) element 4.91 logic 4.94 settings 4.94 specifications 1.18 Date Code 20170927 Instruction Manual SEL-751 Relay...
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Page 919 SEL-751 Relay Command Summary The following table lists the front serial port ASCII La siguiente tabla muestra los comandos ASCII del commands associated with particular activities. The puerto serie frontal asociados con diferentes commands are shown in uppercase letters, but you actividades.
Page 920 2 SEL-751 Relay Command Summary Serial Port Comando del Command Command Description Puerto Serial Descripción del Comando COM L A Appends a long report to the summary report COM L A Anexa un informe detallado al informe de of the last 255 records in the communications síntesis de los últimos 255 registros en el...
Page 921 SEL-751 Relay Command Summary Serial Port Comando del Command Command Description Puerto Serial Descripción del Comando HIS HIF CA Clears or resets the HIF event history and all HIS HIF DT o Borrar o reiniciar el historial de eventos HIF...
Page 922 4 SEL-751 Relay Command Summary Serial Port Comando del Command Command Description Puerto Serial Descripción del Comando MET T Displays RTD and thermal metering data. MED T Mostrar los datos de medición RTD y termicos PING x.x.x.x t Determines if Ethernet port is functioning or PING x.x.x.x t...
Page 923 SEL-751 Relay Command Summary Serial Port Comando del Command Command Description Puerto Serial Descripción del Comando Displays the default target row or the most Mostrar la fila de banderas por defecto o recently viewed target row. la última fila de banderas mostrada.
Page 924 6 SEL-751 Relay Command Summary Serial Port Comando del Command Command Description Puerto Serial Descripción del Comando GROUP n Changes the active group to Group n GRUPO n Usar Grupo de configuraciones n, donde (where n = 1, 2, 3, or 4).
Page 925 SEL-751 Relay Command Summary Serial Port Comando del Command Command Description Puerto Serial Descripción del Comando SET P n Modifies the port n settings, where n = 1, 2, AJU P n Modificar la configuración del puerto n, 3, 4, or F. If not specified, the default is the donde n = 1, 2, 3, 4 o F.
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Page 927 SEL-751 Relay Command Summary The following table lists the front serial port ASCII La siguiente tabla muestra los comandos ASCII del commands associated with particular activities. The puerto serie frontal asociados con diferentes commands are shown in uppercase letters, but you actividades.
Page 928 2 SEL-751 Relay Command Summary Serial Port Comando del Command Command Description Puerto Serial Descripción del Comando COM L A Appends a long report to the summary report COM L A Anexa un informe detallado al informe de of the last 255 records in the communications síntesis de los últimos 255 registros en el...
Page 929 SEL-751 Relay Command Summary Serial Port Comando del Command Command Description Puerto Serial Descripción del Comando HIS HIF CA Clears or resets the HIF event history and all HIS HIF DT o Borrar o reiniciar el historial de eventos HIF...
Page 930 4 SEL-751 Relay Command Summary Serial Port Comando del Command Command Description Puerto Serial Descripción del Comando MET T Displays RTD and thermal metering data. MED T Mostrar los datos de medición RTD y termicos PING x.x.x.x t Determines if Ethernet port is functioning or PING x.x.x.x t...
Page 931 SEL-751 Relay Command Summary Serial Port Comando del Command Command Description Puerto Serial Descripción del Comando Displays the default target row or the most Mostrar la fila de banderas por defecto o recently viewed target row. la última fila de banderas mostrada.
Page 932 6 SEL-751 Relay Command Summary Serial Port Comando del Command Command Description Puerto Serial Descripción del Comando GROUP n Changes the active group to Group n GRUPO n Usar Grupo de configuraciones n, donde (where n = 1, 2, 3, or 4).
Page 933 SEL-751 Relay Command Summary Serial Port Comando del Command Command Description Puerto Serial Descripción del Comando SET P n Modifies the port n settings, where n = 1, 2, AJU P n Modificar la configuración del puerto n, 3, 4, or F. If not specified, the default is the donde n = 1, 2, 3, 4 o F.
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