Schweitzer Engineering Laboratories SEL-351 Instruction Manual
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Schweitzer Engineering Laboratories SEL-351 Instruction Manual

Directional overcurrent relay reclosing relay fault locator
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SEL-351
DIRECTIONAL OVERCURRENT RELAY
RECLOSING RELAY
FAULT LOCATOR
INSTRUCTION MANUAL
SCHWEITZER ENGINEERING LABORATORIES
2350 NE HOPKINS COURT
PULLMAN, WA USA 99163-5603
TEL: (509) 332-1890
FAX: (509) 332-7990
Courtesy of NationalSwitchgear.com

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  • Page 1 SEL-351 DIRECTIONAL OVERCURRENT RELAY RECLOSING RELAY FAULT LOCATOR INSTRUCTION MANUAL SCHWEITZER ENGINEERING LABORATORIES 2350 NE HOPKINS COURT PULLMAN, WA USA 99163-5603 TEL: (509) 332-1890 FAX: (509) 332-7990 Courtesy of NationalSwitchgear.com...
  • Page 2 All brand or product names appearing in this document are the trademark or registered trademark of their respective holders. Schweitzer Engineering Laboratories, SEL , Connectorized, Job Done and are registered trademarks of Schweitzer Engineering Laboratories. OGIC The English language manual is the only approved SEL manual.
  • Page 3 − Added explanation to the Target Reset/Lamp Test Front-Panel Pushbutton subsection to indicate that the targets cannot be reset when a TRIP condition is still present. Section 6: − Corrected 79DTL factory default setting in Table 6.4. Date Code 20001006 Manual Change Information SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 4 − Added Details on the Remote Control Switch MOMENTARY Position subsection. − Clarified the operation of the latch control switches when the SEL-351 Relay loses power (see the Latch Control Switches subsection). − Corrected subsection Relay Disabled Momentarily During Active Setting Group Change.
  • Page 5 R111 and R205. 991123 This revision includes the following changes: Appendix H: − Corrected documentation errors in DNP 3.0 Device Profile, page H-5. Date Code 20001006 Manual Change Information SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 6 − Added Relay Word bit rows (36) and (44) for models 0351x0, 0351x1, and 0351xY. − Changed INT3P to INB in Relay Word Bit row 48 (52). − Inserted * as necessary throughout table to indicate unused Relay Word bits. Manual Change Information Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 7 Section 6: Close and Reclose Logic. − SEL Control Equations settings limitations explained in Table G.2 in OGIC Appendix G: Setting SEL Control Equations. OGIC Date Code 20001006 Manual Change Information SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 8 − − Updated Event report storage and added Voltage Sag/Swell/Interruption report in Section 12: Standard Event Reports, Sag/Swell/Interruption Report, and SER. Updated format and cross-references, reissued complete manual. Manual Change Information Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 9 − Revisions were made to accommodate hardware changes related to model SEL- 03510J/03511J, which are connectorized™. New drawings were added to Section 2: Installation, and various model-specific text references were updated throughout the manual. Date Code 20001006 Manual Change Information SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 10 Relay Word bit differences between the various SEL-351 Relay models. − Table 10.1 lists serial port information for all the SEL-351 Relay models. − − Table 12.3 explains the differences in displaying optoisolated input and output contact information in the event reports for the SEL-351 Relay models.
  • Page 11 − Section 7, Page 7-17 - reprint to fix printer error (date code not changed). − Section 8, Pages 8-8 to 8-12 - reprint to fix printer error affecting Figures 8.1, 8.2, and 8.4 - 8.7 (date code not changed). Date Code 20001006 Manual Change Information SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 12 − Section 9, Settings Sheets, Page 7 of 18 - fix typographical error under Reclosing Relay; Page 10 of 18 - add clarifying statement to text at top of page. Manual Change Information Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 13 Setting Negative-Sequence Overcurrent Elements ® Appendix G: Setting SEL Control Equations OGIC Appendix H: Distributed Network Protocol (DNP) V3.00 Appendix I: ™ IRRORED SECTION 15: SEL-351 RELAY COMMAND SUMMARY Date Code 20001006 Table of Contents SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 14 Courtesy of NationalSwitchgear.com...

  • Page 15: Table Of Contents

    0351x1, and 0351xY; Models 0351x1 and 0351xY Have an Extra I/O Board – See Next 2 Figures) ....................1-9 Figure 1.4: SEL-351 Relay Extra I/O Board (Model 0351xY, Plug-In Connector Version; Main Board Shown in Figure 1.3) ..................1-10 Figure 1.5: SEL-351 Relay Extra I/O Board (Model 0351x1, Screw-Terminal Block Version;...
  • Page 16 Courtesy of NationalSwitchgear.com...

  • Page 17: Section 1: Introduction And Specifications

    0351xT and 0351xY also apply to old models 0351xM and 0351xJ, respectively. The model numbers are derived from the SEL-351 Relay ordering information sheet. The model numbers in Table 1.1 are only the first part of an actual ordering number – enough to distinguish one model type from another.
  • Page 18 These numbers should not be used to order an SEL-351 Relay. Refer to the actual ordering information sheets. Model 0351x0 and 0351x1 differ only in that model 0351x1 has an extra I/O board (and thus increased rack unit height – see Figure 2.1). Model 0351xY is similar to model 0351x1, except that it has plug-in connectors.

  • Page 19: Instruction Manual Sections Overview

    SEL-351 Relays with firmware version 0 can be upgraded to firmware version 1. However, SEL-351 Relays with firmware versions 0 and 1 cannot be upgraded to any higher firmware versions. This is due to hardware limitations. The wye-connected voltage inputs for SEL-351 Relays with firmware version 0 or 1 are rated for voltages up to 150 Vac, line-to-neutral (channel VS, too).
  • Page 20 Output contacts (OUT1 through OUT11 and ALARM - model 0351xT; OUT101 through OUT107 and ALARM - models 0351x0, 0351x1, and 0351xY; OUT201 through OUT 212 - models 0351x1 and 0351xY) • Rotating default displays Introduction and Specifications Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 21 The Settings Sheets are single-sided and can be photocopied and filled out to set the SEL-351 Relay. Note that these sheets correspond to the serial port SET commands listed in Table 9.1. Section 10: Serial Port Communications and Commands describes: •...
  • Page 22 Appendix I: M ™ (in Firmware Versions 1 – 4) IRRORED Section 15: SEL-351 Relay Command Summary briefly describes the serial port commands that are described in detail in Section 10: Serial Port Communications and Commands. Introduction and Specifications Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 23: Applications

    PPLICATIONS Figure 1.1: SEL-351 Relays Applied Throughout the Power System Date Code 20001006 Introduction and Specifications SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 24: Hardware Connection Features

    See Figure 2.8 for an open-delta connection example. Figure 1.2: SEL-351 Relay Inputs, Outputs, and Communications Ports (Model 0351xT) Introduction and Specifications Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 25: Figure 1.3: Sel-351 Relay Inputs, Outputs, And Communications Ports

    See Figure 2.8 for an open-delta con- nection example. Figure 1.3: SEL-351 Relay Inputs, Outputs, and Communications Ports (Models 0351x0, 0351x1, and 0351xY; Models 0351x1 and 0351xY Have an Extra I/O Board – See Next 2 Figures)

  • Page 26: Figure 1.4: Sel-351 Relay Extra I/O Board

    See Output Contacts in Section 2: Installation for more information on the polarity dependence of high-current interrupting output contacts. Figure 1.4: SEL-351 Relay Extra I/O Board (Model 0351xY, Plug-In Connector Version; Main Board Shown in Figure 1.3) 1-10 Introduction and Specifications Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 27 2: Installation for more information on the polarity dependence of high-current interrupting output contacts. Figure 1.5: SEL-351 Relay Extra I/O Board (Model 0351x1, Screw-Terminal Block Version; Main Board Shown in Figure 1.3) Date Code 20001006 Introduction and Specifications 1-11 SEL-351 Instruction Manual...

  • Page 28: Communications Connections

    OMMUNICATIONS ONNECTIONS See Port Connector and Communications Cables in Section 10: Serial Port Communications and Commands for more communications connections information. Figure 1.6: SEL-351 Relay Communications Connections Examples 1-12 Introduction and Specifications Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 29: General Specifications

    ENERAL PECIFICATIONS Important: Do not use the following specification information to order an SEL-351 Relay. Refer to the actual ordering information sheets. 120 V , three-phase four-wire connection. 150 V continuous (connect AC Voltage Inputs any voltage up to 150 Vac). 365 Vac for 10 seconds.
  • Page 30 4 mA of current. Relay accepts demodulated IRIG-B time-code input at Port 2. Relay time is Time-Code synchronized to within ±5 ms of time-source input. Input 1-14 Introduction and Specifications Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 31 Systems (3 kV oscillatory, 5 kV fast transient) (type test). Tests IEEE C37.90.2 IEEE Trial-Use Standard, Withstand Capability of Relay Systems to Radiated Electromagnetic Interference from Transceivers, 10 V/m (type test). Date Code 20001006 Introduction and Specifications 1-15 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 32 Section 2: Electrostatic discharge tests, Severity Level 4 (8 kV contact discharge all points except serial ports, 15 kV air discharge to all other points) (type test). 1-16 Introduction and Specifications Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 33: Processing Specifications

    Time Delay: 0.00 - 16,000.00 cycles, 0.25-cycle steps Timer Accuracy: ±0.25 cycle and ±0.1% of setting See pickup and reset time curves in Figure 3.5 and Figure 3.6 Date Code 20001006 Introduction and Specifications 1-17 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 34: Time-Overcurrent Elements

    Slip Frequency Pickup Range: 0.005 - 0.500 Hz, 0.001 Hz steps Slip Frequency Pickup Accuracy: ±0.003 Hz Phase Angle Range: 0 - 80°, 1° steps ±4° Phase Angle Accuracy: 1-18 Introduction and Specifications Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 35: Under- And Overfrequency Elements

    ±0.01 A and ±3% (0.1 - 20 A) (1 A nominal) ±1 mA and ±5% (0.01 - 1.5 A) (0.05 A nominal channel IN current input) ±0.5° Phase Angle Accuracy Date Code 20001006 Introduction and Specifications 1-19 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 36: Power Element Accuracy

    ±0.005 A · (voltage secondary) and ±5% of setting at unity power factor {1 A nom} Pickup: ±0.025 A · (voltage secondary) and ±5% of setting at unity power factor {5 A nom} 1-20 Introduction and Specifications Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 37: Table Of Contents

    Models 0351x0 and 0351x1..................2-14 Wye-Connected Voltages .................2-14 Delta-Connected Voltages ................2-14 Serial Ports ........................2-14 IRIG-B Time-Code Input ....................2-16 SEL-351 Relay AC/DC Connection Diagrams for Various Applications (Model 0351xT Example) ........................2-17 Circuit Board Connections......................2-25 Accessing the Relay Circuit Boards.................2-25 Output Contact Jumpers....................2-30 “Extra Alarm”...
  • Page 38 Figure 2.2: SEL-351 Relay Front- and Rear-Panel Drawings (Model 0351xT) ........2-3 Figure 2.3: SEL-351 Relay Front- and Rear-Panel Drawings (Model 0351x0) ........2-4 Figure 2.4: SEL-351 Relay Front- and Rear-Panel Drawings – Model 0351x1 Rear and Models 0351x1 and 0351xY Front (Horizontal) ..............2-5 Figure 2.5: SEL-351 Relay Front- and Rear-Panel Drawings –...
  • Page 39 Figure 2.18: Jumper, Connector, and Major Component Locations on the SEL-351 Relay Extra I/O Board (Model 0351x1, Screw-Terminal Block Version) ........2-29 Date Code 20001006 Installation SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 40 Courtesy of NationalSwitchgear.com...

  • Page 41: Section 2: Installation

    SECTION 2: INSTALLATION ELAY OUNTING Figure 2.1: SEL-351 Relay Dimensions, Panel Cutout, and Drill Plan Date Code 20001006 Installation SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 42: Rear-Panel Connection Diagrams

    I/O. All 2U rack height units can be equipped with terminal blocks or plug-in connectors. For model options, view the SEL-351 Model Options Table on our web site, or contact your local SEL sales representative. Installation...
  • Page 43 ANEL ONNECTION IAGRAMS Figure 2.2: SEL-351 Relay Front- and Rear-Panel Drawings (Model 0351xT) Date Code 20001006 Installation SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 44 Figure 2.3: SEL-351 Relay Front- and Rear-Panel Drawings (Model 0351x0) Installation Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 45 Figure 2.4: SEL-351 Relay Front- and Rear-Panel Drawings – Model 0351x1 Rear and Models 0351x1 and 0351xY Front (Horizontal) Date Code 20001006 Installation SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 46 Figure 2.5: SEL-351 Relay Front- and Rear-Panel Drawings – Model 0351xY Rear and Models 0351x1 and 0351xY Front (Vertical) Installation Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 47: Making Rear-Panel Connections

    Introduction and Specifications): → 0351xM 0351xT → 0351xJ 0351xY The respective wiring harness part numbers for these old and new Connectorized SEL-351 Relays are (partial part numbers shown): WA0351xM → WA0351xT → WA0351xJ WA0351xY The other connectors on the Connectorized SEL-351 Relay rear panel (power input, voltage inputs, output contacts, etc.) are the same for the old or new models.

  • Page 48: Wiring Harness

    (1) connector for POWER inputs (+ and -). • (1) spade connector for GROUND connection (chassis ground). These prewired connectors (and the serial port connector) are unique and may only be installed in one orientation. Installation Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 49: Models 0351X0 And 0351X1 (Screw-Terminal Blocks)

    Figure 2.6: SEL-351 Relay Plug-In Connector Coding (Top View; Models 0351xT and 0351xY) Models 0351x0 and 0351x1 (Screw-Terminal Blocks) Tools: Phillips or slotted-tip screwdriver Parts: All screws are size #6-32. Locking screws can be requested from the factory. Chassis Ground...

  • Page 50: Power Supply

    Standard output contacts are not polarity dependent. High-Current Interrupting Output Contacts Model 0351xT part numbers with a numeral “2” in the field underlined below (sample part number) indicate high-current interrupting output contacts: 0351xT42533241 2-10 Installation Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 51: Model 0351X0

    Models 0351x1 and 0351xY part numbers with a numeral “2” in the field underlined below (sample part numbers) indicate standard output contacts on the extra I/O board (OUT201 through OUT212): 0351x1H42542X1 0351xYH42542X1 Standard output contacts are not polarity dependent. Date Code 20001006 Installation 2-11 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 52: High-Current Interrupting Output Contacts

    Note: Do not use the high-current interrupting output contacts to switch ac control signals. Optoisolated Inputs The optoisolated inputs in any of the SEL-351 Relay models (e.g., IN5, IN102, IN207) are not polarity dependent. With nominal control voltage applied, each optoisolated input draws approximately 4 mA of current.

  • Page 53: Models 0351X0 And 0351X1

    VA-VB and VS-NS (see subsections Synchronism Check Elements and Frequency Elements in Section 3: Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements). Date Code 20001006 Installation 2-13 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 54: Models 0351X0 And 0351X1

    All ports are independent - you can communicate to any combination simultaneously. Serial Port 1 on all the SEL-351 Relay models is an EIA-485 port (4-wire). The Serial Port 1 plug-in connector accepts wire size AWG 24 to 12. Strip the wires 0.31 inches (8 mm) and install with a small slotted-tip screwdriver.
  • Page 55 C245A RFL-9660 * A corresponding main board jumper must be installed to power the Telenetics Modem with +5 Vdc (0.5 A limit) from the SEL-351 Relay. See Figure 2.15 and Figure 2.16 and Table 2.8. Date Code 20001006 Installation 2-15 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 56: Irig-B Time-Code Input

    SEL-2020 or SEL-2030 Communications Processors, or the SEL-2100 Protection Logic Processor listed in Table 2.1. A demodulated IRIG-B time code can be input into Serial Port 2 on any of the SEL-351 Relay models (see Table 10.2). This is handled adeptly by connecting Serial Port 2 of the SEL-351 Relay to an SEL-2020, SEL-2030, or SEL-2100 with Cable C273A.

  • Page 57: Example

    0351 ODEL XAMPLE For line recloser control installations (see bottom of Figure 1.1), an SEL-351 Relay is connected much like this example. The voltage inputs do not need to be connected. Voltage is needed for voltage elements, synchronism check elements, frequency elements, voltage-polarized directional elements, fault location, metering (i.e., voltage, MW, MVAR), and frequency tracking.
  • Page 58 (serial port communications, optoisolated input assertion, etc.), with desired supervision (e.g., synchronism check). Figure 2.8: SEL-351 Relay Provides Overcurrent Protection for a Distribution Bus (Includes Fast Bus Trip Scheme; Delta-Connected Voltage Inputs Shown) 2-18...
  • Page 59 = 3I ). But in this residual connection example, the neutral ground and residual ground overcurrent elements operate the same because I Figure 2.9: SEL-351 Relay Provides Directional Overcurrent Protection and Reclosing for a Transmission Line Date Code 20001006 Installation...
  • Page 60 Separate from Channel IN, the residual ground overcurrent elements operate from the internally derived residual current I = 3I Figure 2.10: SEL-351 Relay Provides Directional Overcurrent Protection and Reclosing for a Transmission Line (Current Polarization Source Connected to Channel IN)
  • Page 61 (e.g., hot bus check). For sensitive earth fault (SEF) applications, the SEL-351 Relay should be ordered with channel IN rated at 0.05 A nominal. See current input specifications in the General Specifications subsection in Section 1: Introduction and Specifications.
  • Page 62 Although automatic reclosing is probably not needed in this example, output contact OUT2 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 2.12: SEL-351 Relay Provides Overcurrent Protection for a Transformer Bank With a Tertiary Winding 2-22...
  • Page 63 (serial port communications, optoisolated input assertion, etc.), with desired supervision. For sensitive earth fault (SEF) applications, the SEL-351 Relay should be ordered with channel IN rated at 0.05 A nominal. See current input specifications in the General Specifications subsection in Section 1: Introduction and Specifications.
  • Page 64 I = 3I ). But in this residual connection example, the neutral ground and residual ground overcurrent elements operate the same because I Figure 2.14: SEL-351 Relay Provides Dedicated Breaker Failure Protection 2-24 Installation Date Code 20001006 SEL-351 Instruction Manual...

  • Page 65: Circuit Board Connections

    Each circuit board corresponds to a row of rear-panel terminal blocks or connectors and is affixed to a drawout tray. Identify which drawout tray needs to be removed. SEL-351 Relay models 0351x0 and 0351xT have only a main board. Models 0351x1 and 0351xY have an extra I/O board below the main board.
  • Page 66 Figure 2.15: Jumper, Connector, and Major Component Locations on the SEL-351 Relay Main Board (Model 0351xT) 2-26 Installation Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 67 Figure 2.16: Jumper, Connector, and Major Component Locations on the SEL-351 Relay Main Board (Models 0351x0, 0351x1, and 0351xY) Date Code 20001006 Installation 2-27 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 68 Figure 2.17: Jumper, Connector, and Major Component Locations on the SEL-351 Relay Extra I/O Board (Models 0351xY, Plug-In Connector Version) 2-28 Installation Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 69 Figure 2.18: Jumper, Connector, and Major Component Locations on the SEL-351 Relay Extra I/O Board (Model 0351x1, Screw-Terminal Block Version) Date Code 20001006 Installation 2-29 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 70: Output Contact Jumpers

    An extra alarm output contact can be had for all the SEL-351 Relay models without the addition of any external hardware. The output contact next to the dedicated ALARM output contact can be converted to operate as an “extra alarm”...
  • Page 71 ALARM output contact), it will be in the opposite state of the dedicated ALARM output contact in a standard relay shipment. In a standard relay shipment, the dedicated ALARM Date Code 20001006 Installation 2-31 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 72 D. Jumpers A and B are used (see Table 2.6 and Table 2.7). Jumpers C and D are not used. Therefore, the positions (ON or OFF) of jumpers C and D are of no consequence. 2-32 Installation Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 73 Reassemble the relay as described in Accessing the Relay Circuit Boards. Set the relay date and time via serial communications port or front panel (see Section 10: Serial Port Communications and Commands or Section 11: Front-Panel Interface, respectively). Date Code 20001006 Installation 2-33 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 74 Courtesy of NationalSwitchgear.com...
  • Page 75 Reset Timing Details (51PT Element Example)............3-21 Setting 51PRS = Y...................3-21 Setting 51PRS = N...................3-22 Operation of Single-Phase Time-Overcurrent Elements (51AT, 51BT, 51CT)...3-22 Neutral Ground Time-Overcurrent Element ..............3-24 Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 76 Underfrequency Element ..................3-54 Frequency Element Operation..................3-54 Overfrequency Element Operation................3-54 Underfrequency Element Operation................3-55 Frequency Element Voltage Control .................3-55 Other Uses for Undervoltage Element 27B81............3-55 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 77 Figure 3.5: SEL-351 Relay Nondirectional Instantaneous Overcurrent Element Pickup Time Curve .........................3-7 Figure 3.6: SEL-351 Relay Nondirectional Instantaneous Overcurrent Element Reset Time Curve..3-7 Figure 3.7: Levels 1 Through 4 Phase-to-Phase Instantaneous Overcurrent Elements......3-9 Figure 3.8: Levels 1 Through 4 Neutral Ground Instantaneous/Definite-Time Overcurrent Elements (With Directional Control Option)..............3-10...
  • Page 78 Figure 3.34: Power Elements Logic (+VARS Example Shown) ............3-60 Figure 3.35: Power Elements Operation in the Real/Reactive Power Plane...........3-61 Figure 3.36: SEL-351(B) Relay Provides VAR Control for 9600 kVAR Capacitor Bank.....3-62 Figure 3.37: Per Unit Setting Limits for Switching 9600 kVAR Capacitor Bank On- and Off-Line ..3-63...

  • Page 79: Section 3: Overcurrent, Voltage, Synchronism Check, Frequency, And Power Elements

    ±0.01 A secondary and ±3% of setting (1 A nominal phase current inputs, IA, IB, IC) ±0.25 cycles and ±0.1% of setting Timer: ±5% of setting Transient Overreach: Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 80 Figure 3.1: Levels 1 through 4 Phase Instantaneous Overcurrent Elements Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 81: Pickup Operation

    Ideally, set 50P1P > 50P2P > 50P3P > 50P4P so that instantaneous overcurrent elements 67P1 through 67P4 will display in an organized fashion in event reports (see Figure 3.3 and Table 12.4). Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 82 Figure 3.3: Levels 1 through 4 Phase Instantaneous/Definite-Time Overcurrent Elements (With Directional Control Option)Directional Control Option Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 83: Directional Control Option

    See SHO Command (Show/View Settings) in Section 10: Serial Port Communications and Commands for a list of the factory default settings. Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 84: Combined Single-Phase Instantaneous Overcurrent Elements

    Relay Word bits 50A, 50B, and 50C can be used to indicate the presence or absence of current in a particular phase. Figure 3.4: Combined Single-Phase Instantaneous Overcurrent Elements Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 85: Pickup And Reset Time Curves

    Figure 3.5 and Figure 3.6 show pickup and reset time curves applicable to all nondirectional instantaneous overcurrent elements in the SEL-351 Relay (60 Hz or 50 Hz relays). These times do not include output contact operating time and , thus, are accurate for determining element operation time for use in internal SEL Control Equations.

  • Page 86: Phase-To-Phase Instantaneous Overcurrent Elements

    Directional Comparison Blocking (DCB) Logic in Section 5: Trip and Target Logic). All the other neutral ground instantaneous/definite-time overcurrent elements are available for use in any tripping or control scheme. Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 87 Relay Word bits. For sensitive earth fault (SEF) applications, the SEL-351 Relay should be ordered with channel IN rated at 0.05 A nominal. For this channel IN rating, the increased pickup sensitivity of the neutral ground overcurrent elements is noted in the following setting ranges.
  • Page 88 Figure 3.8: Levels 1 Through 4 Neutral Ground Instantaneous/Definite-Time Overcurrent Elements (With Directional Control Option) 3-10 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 89: Settings Ranges

    ±0.25 cycles and ±0.1% of setting Timer: ±5% of setting Transient Overreach: Pickup and Reset Time Curves See Figure 3.5 and Figure 3.6. Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-11 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 90: Residual Ground Instantaneous/Definite-Time Overcurrent Elements

    The different levels are enabled with the E50G enable setting, as shown in Figure 3.10 and Figure 3.11. Figure 3.10: Levels 1 Through 4 Residual Ground Instantaneous/Definite-Time Overcurrent Elements (With Directional Control Option) 3-12 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 91: Settings Ranges

    ±0.25 cycles and ±0.1% of setting Timer: ±5% of setting Transient Overreach: Pickup and Reset Time Curves See Figure 3.5 and Figure 3.6. Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-13 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 92: Negative-Sequence Instantaneous/Definite-Time Overcurrent Elements

    ±0.25 cycles and ±0.1% of setting Timer: ±5% of setting Transient Overreach: Pickup and Reset Time Curves See Figure 3.5 and Figure 3.6. 3-14 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 93 Figure 3.12: Levels 1 Through 4 Negative-Sequence Instantaneous/Definite-Time Overcurrent Elements (With Directional Control Option) Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-15 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 94: Time-Overcurrent Elements

    The following is an example of 51PT element operation. The other phase time-overcurrent elements operate similarly (note the similarity among the logic in Figure 3.14, Figure 3.15, Figure 3.16, and Figure 3.17). 3-16 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 95: Settings Ranges (51Pt Element Example)

    Control Equation torque control settings (e.g., 51PTC) cannot be set directly to OGIC logical 0. See Section 9: Setting the Relay for additional time-overcurrent element setting information. Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-17 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 96: Accuracy

    See Trip Logic in Section 5: Trip and Target Logic. 51PR Phase time-overcurrent element is Element reset testing or other fully reset. control applications. 3-18 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 97: Torque Control Switch Operation (51Pt Element Example)

    0. The phase time-overcurrent element then starts to time to reset. Relay Word bit 51PR asserts to logical 1 when the phase time-overcurrent element is fully reset. Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-19 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 98: Control Of Logic Point Tcp

    If directional control enable setting E32 = N, then logic point TCP = logical 1 and, thus, the Torque Control Switch closes and phase time-overcurrent element 51PT is enabled and nondirectional. 3-20 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 99: Reset Timing Details (51Pt Element Example)

    Relay Word bit 51PR (resetting indication) = logical 1 when the element is fully reset. Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-21 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 100: Setting 51Prs = N

    Table 3.2. Figure 3.15: A-Phase Time-Overcurrent Element 51AT (With Directional Control Option) 3-22 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 101 Figure 3.16: B-Phase Time-Overcurrent Element 51BT (With Directional Control Option) Figure 3.17: C-Phase Time-Overcurrent Element 51CT (With Directional Control Option) Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-23 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 102: Neutral Ground Time-Overcurrent Element

    Relay Word bits. For sensitive earth fault (SEF) applications, the SEL-351 Relay should be ordered with channel IN rated at 0.05 A nominal. For this channel IN rating, the increased pickup sensitivity of the neutral ground time-overcurrent element is noted in Table 3.4.

  • Page 103: Settings Ranges

    Phase Time-Overcurrent Elements subsection, substituting residual ground current I = 3I ) for maximum phase current I and substituting like settings and Relay Word bits. Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-25 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 104: Settings Ranges

    Control Equation torque control setting 51GTC is set directly to logical 0 (i.e., OGIC 51GTC = 0), then corresponding residual ground time-overcurrent element 51GT is defeated and nonoperational, regardless of any other setting. 3-26 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 105: Accuracy

    = 1 ∠ 120° and a = 1 ∠ -120°] for maximum phase current I and like settings and Relay Word bits. Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-27 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 106: Settings Ranges

    ±0.01 A secondary and ±3% of setting (1 A nominal phase current inputs, IA, IB, IC) ±1.50 cycles and ±4% of curve time for currents between (and including) 2 and Curve Timing: 30 multiples of pickup 3-28 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 107: Voltage Elements

    Table 3.7: Voltage Values Used by Voltage Elements Voltage Description A-phase voltage, from SEL-351 Relay rear-panel voltage input VA (see Note 1) B-phase voltage, from SEL-351 Relay rear-panel voltage input VB (see Note 1) C-phase voltage, from SEL-351 Relay rear-panel voltage input VC (see Note 1)
  • Page 108 0.00 - 200.00 V secondary {300 V voltage inputs} 59V1 59V1P 0.00 - 150.00 V secondary {150 V voltage inputs} 0.00 - 300.00 V secondary {300 V voltage inputs} 3-30 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 109 0.00 - 300.00 V secondary {300 V voltage inputs} 59S2 59S2P 0.00 - 150.00 V secondary {150 V voltage inputs} 0.00 - 300.00 V secondary {300 V voltage inputs} Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-31 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 110 27SP Figure 3.25 0.00 - 260.00 V secondary 59S1 59S1P 0.00 - 260.00 V secondary 59S2 59S2P 0.00 - 260.00 V secondary 3-32 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 111 Figure 3.21: Single-Phase and Three-Phase Voltage Elements (Wye-Connected Voltages) Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-33 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 112 Figure 3.22: Phase-to-Phase and Sequence Voltage Elements (Wye-Connected Voltages) 3-34 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 113 Figure 3.23: Phase-to-Phase Voltage Elements (Delta-Connected Voltages) Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-35 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 114: Accuracy

    Undervoltage elements (Device 27) assert when the operating voltage goes below the corresponding pickup setting. Overvoltage elements (Device 59) assert when the operating voltage goes above the corresponding pickup setting. 3-36 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 115: Undervoltage Element Operation Example

    27AB1, 27BC1, 27CA1, and 59Q1 are also used in the weak-infeed portion of the POTT logic, if the weak-infeed logic is enabled (see Figure 5.6). Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-37 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 116: Synchronism Check Elements

    , or V ), an angle setting is made with the SYNCP setting (see Table 3.10 and the SYNCP setting discussion that follows). 3-38 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 117: Synchronism Check Elements Settings

    0.00 - 60.00 cycles compensation BSYNCH Control Equation block Relay Word bits referenced in Table OGIC synchronism check setting Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-39 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 118: Setting Syncp

    ). The relay will display the setting entered (SYNCP = VAB or SYNCP = 0). See the Application Guide entitled Compensate for Constant Phase Angle Difference in Synchronism Check with the SEL-351 Relay Family for more information on setting SYNCP with an angle setting. Accuracy ±1 V and ±5% of setting {150 V voltage inputs}...
  • Page 119 Figure 3.26: Synchronism Check Voltage Window and Slip Frequency Elements Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-41 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 120: Synchronism Check Elements Voltage Inputs

    V for delta- connected voltages), designated by setting SYNCP (e.g., if SYNCP = VB, then V Synchronism check voltage, from SEL-351 Relay rear-panel voltage input VS 3-42 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 121: System Frequencies Determined From Voltages V

    VA connected to Phase A • voltage input VS connected to Phase B • setting SYNCP = 120 degrees (V constantly lags V by 120°) Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-43 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 122: Synchronism Check Elements Operation

    For more information on setting SYNCP with an angle setting, see the Application Guide titled Compensate for Constant Phase Angle Difference in Synchronism Check with the SEL-351 Relay Family. Synchronism Check Elements Operation Refer to Figure 3.26 and Figure 3.27.

  • Page 123: Slip Frequency Calculator

    25SF (Relay Word bit SF is asserted). Voltages V and V are “Static” Refer to top of Figure 3.27. Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-45 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 124: Angle Difference Example

    ) = (59.95 Hz - 60.05 Hz) = -0.10 Hz = -0.10 slip cycles/second TCLOSD x (1 second/60 cycles) = 10 cycles x (1 second/60 cycles) = 0.167 second 3-46 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 125 , as shown in Figure 3.28 (Note: The angle compensation in Figure 3.28 appears much greater than 6°. Figure 3.28 is for general illustrative purposes only). Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-47 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 126 Figure 3.28: Angle Difference Between V and V Compensated by Breaker Close Time < f and V Shown as Reference in This Example) 3-48 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 127: P And V Are "Slipping" And Setting Tclosd ≠ 0.00

    Angle Difference is increasing, but the Angle Difference is still less than maximum angle settings 25ANG1 or 25ANG2, then corresponding synchronism check elements 25A1 or 25A2 assert to logical 1. Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-49 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 128 79CLS asserts to logical 1 for 1/4 cycle, allowing the sealed-in open interval time out to propagate on to the close logic in Figure 6.1 in Section 6: Close and Reclose Logic. Element 25A2 operates similarly. 3-50 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 129: Synchronism Check Applications For Automatic Reclosing And Manual Closing

    Figure 3.30. Frequency is determined from the voltage connected to voltage terminals VA-N (or VA-VB for delta). Frequency Element Settings Figure 3.29: Undervoltage Block for Frequency Elements Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-51 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 130 Figure 3.30: Levels 1 Through 6 Frequency Elements 3-52 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 131: Accuracy

    Note that pickup settings 81D1P through 81D6P are compared to setting NFREQ. NFREQ is the nominal frequency setting (a global setting), set to 50 or 60 Hz. Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-53 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 132: Overfrequency Element

    (instantaneous element) 81D1T = logical 1 (time delayed element) Relay Word bit 81D1T asserts to logical 1 only after time delay 81D1D. 3-54 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 133: Underfrequency Element Operation

    The instantaneous frequency elements (81D1 through 81D6) are used in testing only. The time-delayed frequency elements (81D1T through 81D6T) are used for underfrequency load shedding, frequency restoration, and other schemes. Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-55 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 134 VAILABLE IN IRMWARE ERSIONS The SEL-351 Relay has three types of elements to detect voltage quality problems. These elements detect voltage sags, swells, and interruptions. Voltage Sag Elements: If the magnitude of a phase voltage drops below the voltage sag percentage setting of the positive- sequence memory voltage magnitude for one cycle, the corresponding SAG Relay Word bit for that phase asserts (SAGA, SAGB, or SAGC).
  • Page 135 5% above the interruption pickup threshold for at least one cycle. Note: Reset has priority over sag. Figure 3.33: Voltage Interruption Elements Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-57 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 136 Typical applications are: • Overpower and/or underpower protection/control • Reverse power protection/control • VAR control for capacitor banks 3-58 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 137 +WATTS or -WATTS) or power factor = 0 (for PWRnT = +VARS or -VARS)(1A nominal phase current inputs, IA, IB, IC) Timer: +0.25 cycles and +0.1% of setting Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-59 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 138 = 1 A sec or 5 A sec Repeat for Phases B and C 0.1×I 10 V sec DWG: M351196 Figure 3.34: Power Elements Logic (+VARS Example Shown) 3-60 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 139 -VARS are chosen with setting PWRnT, the corresponding real or reactive power values have to be multiplied by -1 so that element PWRAn asserts for negative real or reactive power. Date Code 20001006 Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements 3-61 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 140 52-B for a fault on the 21.6 kV bus. In Figure 3.36, a block close signal is sent from the SEL-351(C) Relay to the SEL-351(B) Relay if the SEL-351(C) Relay trips circuit breaker 52-C for a fault in the capacitor bank. This prevents the SEL-351(B) Relay from issuing an automatic close to circuit breaker 52-C.
  • Page 141 SEL-351(C) Relay trips circuit breaker 52-C for a fault in the capacitor bank - no automatic closing can then take place. These block close signals seal in when the SEL-351(C) Relay trips circuit breaker 52-C for a fault in the capacitor bank.
  • Page 142 VAR level exceeds the 0.3 per unit VAR level (lagging) for each respective phase (see Figure 3.37 and left-hand side of Figure 3.35). These elements are used in close logic in the SEL-351(B) Relay to automatically put the 9600 kVAR capacitor bank on-line.
  • Page 143 Convert Maximum Loads to Equivalent Secondary Impedances........4-5 Convert Power Factors to Equivalent Load Angles.............4-5 Apply Load-Encroachment Logic to a Phase Time-Overcurrent........4-6 Use SEL-321 Relay Application Guide for the SEL-351 Relay ..........4-7 Directional Control for Neutral Ground and Residual Ground Overcurrent Elements....4-7 Internal Enables ........................4-9 Best Choice Ground Directional™...
  • Page 144 Overcurrent Elements ....................4-18 Figure 4.14: Negative-Sequence Voltage-Polarized Directional Element for Negative-Sequence and Phase Overcurrent Elements ................4-21 Figure 4.15: Positive-Sequence Voltage-Polarized Directional Element for Phase Overcurrent Elements........................4-22 Loss-of-Potential, Load Encroachment, and Directional Element Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 145 Figure 4.16: Routing of Directional Elements to Negative-Sequence and Phase Overcurrent Elements........................4-23 Figure 4.17: Direction Forward/Reverse Logic for Negative-Sequence Overcurrent Elements ....4-24 Figure 4.18: Direction Forward/Reverse Logic for Phase Overcurrent Elements ........4-25 Date Code 20001006 Loss-of-Potential, Load Encroachment, and Directional Element Logic SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 146 Courtesy of NationalSwitchgear.com...

  • Page 147: Section 4: Loss-Of-Potential, Load Encroachment, And Directional Element Logic

    (V secondary) The circuit breaker has to be closed (Relay Word bit 3PO = logical 0) for the LOP logic to operate. Date Code 20001006 Loss-of-Potential, Load Encroachment, and Directional Element Logic SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 148: Setting Elop = Y Or Y1

    1 for a loss-of-potential condition) but does not disable any voltage-based directional elements (as occurs with ELOP = Y or Y1) or enable overcurrent elements set direction forward (as occurs with ELOP = Y). Loss-of-Potential, Load Encroachment, and Directional Element Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 149: Load-Encroachment Logic

    This runs the risk of tripping on bus load current. The load-encroachment feature prevents this from happening as shown in the example that follows in this subsection. Figure 4.2: Load-Encroachment Logic Date Code 20001006 Loss-of-Potential, Load Encroachment, and Directional Element Logic SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 150: Settings Ranges

    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. Loss-of-Potential, Load Encroachment, and Directional Element Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 151: Convert Maximum Loads To Equivalent Secondary Impedances

    Setting PLAR = 180° - cos (0.80) = 180° - 37° = 143° Setting NLAR = 180° + cos (0.95) = 180° + 18° = 198° Date Code 20001006 Loss-of-Potential, Load Encroachment, and Directional Element Logic SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 152: Apply Load-Encroachment Logic To A Phase Time-Overcurrent

    This change in V can possibly cause ZLOAD to deassert (= logical 0), erroneously indicating that a “fault condition” exists. Thus, !ZLOAD Loss-of-Potential, Load Encroachment, and Directional Element Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 153: Use Sel-321 Relay Application Guide For The Sel-351 Relay

    = !ZLOAD*NOT[logical 1] + 50P6 = 50P6 Use SEL-321 Relay Application Guide for the SEL-351 Relay The load-encroachment logic and settings in the SEL-351 Relay are the same as those in the SEL- 321 Relay. Refer to Application Guide 93-10 (SEL-321 Relay Load-Encroachment Function Setting Guidelines) for applying the load-encroachment logic in the SEL-351 Relay.
  • Page 154 Figure 4.6). The zero-sequence voltage-polarized directional element that follows in Figure 4.9 is defeated and nonoperational when internal enable 32VE = logical 0. Loss-of-Potential, Load Encroachment, and Directional Element Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 155: Internal Enables

    (Figure 4.10) is enabled if enable setting ELOP = Y or Y1 and a loss-of-potential condition occurs (Relay Word bit LOP asserts). Refer to Figure 4.1 and accompanying text for more information on loss-of-potential. Date Code 20001006 Loss-of-Potential, Load Encroachment, and Directional Element Logic SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 156: Directional Element Routing

    Level 3 overcurrent elements set direction reverse (DIR3 = R) If a level direction setting (e.g., DIR1) is set: DIR1 = N (nondirectional) 4-10 Loss-of-Potential, Load Encroachment, and Directional Element Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 157 Provided by Torque Control Settings at the end of this section describes how to avoid this limitation for special cases. Figure 4.5: Internal Enables (32QE and 32QGE) Logic for Negative-Sequence Voltage- Polarized Directional Elements Date Code 20001006 Loss-of-Potential, Load Encroachment, and Directional Element Logic 4-11 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 158 Figure 4.6). The zero-sequence voltage-polarized directional element that follows in Figure 4.9 is defeated and nonoperational when internal enable 32VE = logical 0. 4-12 Loss-of-Potential, Load Encroachment, and Directional Element Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 159 Thus, the zero-sequence voltage-polarized directional element in Figure 4.9 is defeated, nonoperational, and unavailable when the voltage inputs are delta-connected (see Figures 1.2 and 1.3). Figure 4.7: Best Choice Ground Directional Logic Date Code 20001006 Loss-of-Potential, Load Encroachment, and Directional Element Logic 4-13 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 160 Figure 4.8: Negative-Sequence Voltage-Polarized Directional Element for Neutral Ground and Residual Ground Overcurrent Elements 4-14 Loss-of-Potential, Load Encroachment, and Directional Element Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 161 Figure 4.9: Zero-Sequence Voltage-Polarized Directional Element for Neutral Ground and Residual Ground Overcurrent Elements (see Note 2 Following Figure 4.6) Date Code 20001006 Loss-of-Potential, Load Encroachment, and Directional Element Logic 4-15 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 162 Residual Ground Overcurrent Elements (see Note 1 Following Figure 4.6) Figure 4.11: Routing of Directional Elements to Neutral Ground and Residual Ground Overcurrent Elements 4-16 Loss-of-Potential, Load Encroachment, and Directional Element Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 163 Figure 4.12: Direction Forward/Reverse Logic for Neutral Ground and Residual Ground Overcurrent Elements Date Code 20001006 Loss-of-Potential, Load Encroachment, and Directional Element Logic 4-17 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 164: Internal Enables

    The settings involved with internal enable 32QE in Figure 4.5 (e.g., settings a2, k2) are explained in a following subsection Directional Control Settings. 4-18 Loss-of-Potential, Load Encroachment, and Directional Element Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 165: Directional Elements

    ELOP = Y. Refer to Figure 4.1 and accompanying text for more information on loss-of-potential. Date Code 20001006 Loss-of-Potential, Load Encroachment, and Directional Element Logic 4-19 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 166: Direction Forward/Reverse Logic

    Subsection Directional Control Provided by Torque Control Settings at the end of this section describes how to avoid this limitation for special cases. 4-20 Loss-of-Potential, Load Encroachment, and Directional Element Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 167 Figure 4.14: Negative-Sequence Voltage-Polarized Directional Element for Negative- Sequence and Phase Overcurrent Elements Date Code 20001006 Loss-of-Potential, Load Encroachment, and Directional Element Logic 4-21 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 168 Figure 4.15: Positive-Sequence Voltage-Polarized Directional Element for Phase Overcurrent Elements 4-22 Loss-of-Potential, Load Encroachment, and Directional Element Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 169 Figure 4.16: Routing of Directional Elements to Negative-Sequence and Phase Overcurrent Elements Date Code 20001006 Loss-of-Potential, Load Encroachment, and Directional Element Logic 4-23 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 170 Figure 4.17: Direction Forward/Reverse Logic for Negative-Sequence Overcurrent Elements 4-24 Loss-of-Potential, Load Encroachment, and Directional Element Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 171 Figure 4.18: Direction Forward/Reverse Logic for Phase Overcurrent Elements Date Code 20001006 Loss-of-Potential, Load Encroachment, and Directional Element Logic 4-25 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 172: Directional Control Settings

    E32 = AUTO or Y. These settings are: DIR1, DIR2, DIR3, DIR4, ORDER, 50P32P, and E32IV All these settings are explained in detail in the remainder of this subsection. 4-26 Loss-of-Potential, Load Encroachment, and Directional Element Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 173: Settings

    Level 1 overcurrent elements set direction forward (DIR1 = F) Level 2 overcurrent elements set direction forward (DIR2 = F) Level 3 overcurrent elements set direction reverse (DIR3 = R) Date Code 20001006 Loss-of-Potential, Load Encroachment, and Directional Element Logic 4-27 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 174: Order - Ground Directional Element Priority Setting

    (V = zero-sequence voltage-polarized directional element; see Figure 4.9) provides directional control for the neutral ground and residual ground overcurrent elements. 4-28 Loss-of-Potential, Load Encroachment, and Directional Element Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 175: 50P32P - Phase Directional Element Three-Phase Current Pickup

    IA, IB, IC) -320.00 to 320.00 W secondary (150 V voltage inputs, VA, VB, VC; 1 A nominal phase current inputs, IA, IB, IC) Date Code 20001006 Loss-of-Potential, Load Encroachment, and Directional Element Logic 4-29 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 176: Z2F And Z2R Set Automatically

    (see Figure 4.5). Ideally, the setting is above normal load unbalance and below the lowest expected negative-sequence current magnitude for unbalanced reverse faults. 4-30 Loss-of-Potential, Load Encroachment, and Directional Element Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 177: 50Qfp And 50Qrp Set Automatically

    32QGE internal enable for the negative-sequence voltage-polarized directional element that controls the neutral ground and residual ground overcurrent elements Date Code 20001006 Loss-of-Potential, Load Encroachment, and Directional Element Logic 4-31 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 178: K2 Set Automatically

    IN current-polarized directional elements (see Figure 4.6). Ideally, the setting is above normal load unbalance and below the lowest expected zero-sequence current magnitude for unbalanced forward faults. 4-32 Loss-of-Potential, Load Encroachment, and Directional Element Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 179: 50Gfp And 50Grp Set Automatically

    (I ) magnitude in order for the zero-sequence voltage-polarized and > × channel IN current-polarized directional elements to be enabled ( I Date Code 20001006 Loss-of-Potential, Load Encroachment, and Directional Element Logic 4-33 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 180: Z0F - Forward Directional Z0 Threshold

    Control Equation setting E32IV must be asserted to logical 1 to enable the zero-sequence OGIC voltage-polarized and channel IN current-polarized directional elements for directional control of neutral ground and residual ground overcurrent elements. 4-34 Loss-of-Potential, Load Encroachment, and Directional Element Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 181: Directional Control Provided By Torque Control Settings

    Control Equation setting E32IV OGIC should be deasserted to logical 0. In this example, this is accomplished by connecting a circuit breaker auxiliary contact from the identified circuit breaker to the SEL-351 Relay: E32IV = IN6 (52a connected to optoisolated input IN6) Most any desired control can be set in SEL Control Equation setting E32IV.
  • Page 182 Level 1 overcurrent elements (controlled by level direction setting DIR1). The same setting principles can apply to the other levels as well. Many variations are possible. 4-36 Loss-of-Potential, Load Encroachment, and Directional Element Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 183 SEL-351 Relays....................5-13 Trip Settings Differences Between the SEL-321 and SEL-351 Relays.......5-14 Permissive Overreaching Transfer Trip (POTT) Logic ............5-14 Use Existing SEL-321 Relay POTT Application Guide for the SEL-351 Relay ....5-14 External Inputs .......................5-14 PT1 – Received Permissive Trip Signal(s)..............5-15 Timer Settings.........................5-15 Z3RBD –...
  • Page 184 Installation Variations .....................5-18 Directional Comparison Unblocking (DCUB) Logic..............5-19 Use Existing SEL-321 Relay DCUB Application Guide for the SEL-351 Relay ....5-20 External Inputs .......................5-20 PT1, PT2 – Received Permissive Trip Signal(s) ............5-20 LOG1, LOG2 – Loss-of-Guard Signal(s) ..............5-20 Timer Settings.........................5-21 GARD1D – Guard-Present Delay ................5-21 UBDURD –...
  • Page 185 Figure 5.6: POTT Logic ........................5-17 Figure 5.7: Permissive Input Logic Routing to Trip Logic ..............5-18 Figure 5.8: SEL-351 Relay Connections to Communications Equipment for a Two-Terminal Line POTT Scheme (Model 0351xT Example)............5-19 Figure 5.9: SEL-351 Relay Connections to Communications Equipment for a Three-Terminal Line POTT Scheme (Model 0351xT Example)............5-19...
  • Page 186 Courtesy of NationalSwitchgear.com...

  • Page 187: Section 5: Trip And Target Logic

    This timer establishes the minimum time duration for which the TRIP Relay Word bit asserts. This is rising edge initiated timer. The settable range for this timer is 4 - 16,000 cycles. See Figure 5.2. Date Code 20001006 Trip and Target Logic SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 188 Level 1 overcurrent elements and other time delayed elements (e.g., Level 2 definite-time overcurrent elements), and TRSOTF is set with nondirectional overcurrent elements. Figure 5.1: Trip Logic Trip and Target Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 189: Set Trip

    Figure 5.2: Minimum Trip Duration Timer Operation (See Bottom of Figure 5.1) Note: OPEN Command no longer embedded in Trip Logic In previous firmware versions of the SEL-351 Relay, the OPEN command was embedded in the trip logic in Figure 5.1. The OPEN command was routed directly into the Minimum Trip Duration Timer, along with the output of logic gate OR-1.

  • Page 190: Unlatch Trip

    OPEN command into the trip logic. But, this is not a problem - just a redundancy in logic. Thus, SEL-351 Relays with various firmware versions can be set the same with respect to setting TR = … + OC.

  • Page 191: Other Applications For The Target Reset Function

    0 to 1, SH0 = logical 0, and element 50P1 cannot generate a trip. See Section 6: Close and Reclose Logic for more information on reclosing relay operation. Date Code 20001006 Trip and Target Logic SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 192: Unlatch Trip

    Input IN1 must be energized (52b circuit breaker auxiliary contact has to be closed) before the trip logic unlatches and the TRIP Relay Word bit deasserts to logical 0. Trip and Target Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 193: Program An Output Contact For Tripping

    TRSOTF (e.g., TRSOTF = 50P2) to trip after the circuit breaker closes. Figure 5.3 and the following discussion describe the three-pole open (3PO) logic and the SOTF logic. Date Code 20001006 Trip and Target Logic SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 194: Three-Pole Open Logic

    The 3POD dropout time qualifies circuit breaker closure, whether detected by circuit breaker status (52A) or load current level (50L). When the circuit breaker is closed: 3PO = logical 0 (circuit breaker closed) Trip and Target Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 195: Determining Three-Pole Open Condition Without Circuit Breaker Auxiliary Contact

    (indicating that the circuit breaker is open). Circuit breaker closure is detected by monitoring the dc close bus. This is accomplished by wiring an optoisolated input on the SEL-351 Relay (e.g., IN7) to the dc close bus. When a manual close Date Code 20001006...

  • Page 196: Switch-Onto-Fault Logic Output (Sotfe)

    The directional elements have no voltage for reference and cannot operate. In this case, the instantaneous overcurrent element in the SOTF trip logic should be nondirectional. 5-10 Trip and Target Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 197: Enable Setting Ecomm

    SSISTED OGIC ENERAL VERVIEW The SEL-351 Relay includes communications-assisted tripping schemes that provide unit- protection for transmission lines with the help of communications. No external coordination devices are required. Figure 5.4: Communications-Assisted Tripping Scheme Refer to Figure 5.4 and the top half of Figure 5.1.

  • Page 198: Trip Setting Trcomm

    Trip Settings TRSOTF and TR In a communications-assisted trip scheme, the SEL Control Equation trip settings TRSOTF OGIC and TR can also be used, in addition to setting TRCOMM. 5-12 Trip and Target Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 199: Trip Setting Dtt

    IN2 = PT PT1 = IN2 (received permissive trip) In the above SEL-351 Relay setting example, Relay Word bit IN2 is set in the PT1 SEL OGIC Control Equation. Optoisolated input IN2 is wired to a communications equipment receiver output contact.

  • Page 200: Trip Settings Differences Between The Sel-321 And Sel-351 Relays

    The SEL-321 Relay handles trip unlatching with setting TULO. The SEL-351 Relay handles trip unlatching with SEL Control Equation setting ULTR. OGIC The SEL-321 Relay has single-pole trip logic. The SEL-351 Relay does not have single-pole trip logic. (POTT) L ERMISSIVE...

  • Page 201: Pt1 - Received Permissive Trip Signal(S)

    (two-terminal line application) In three-terminal line POTT applications, permissive trip signals are received from two remote terminals. Two optoisolated inputs on the SEL-351 Relay (e.g., input IN4 and IN6) are driven by communications equipment receiver outputs (see Figure 5.9). Make SEL...

  • Page 202: Eblkd - Echo Block Delay

    In a three-terminal line scheme, output contact OUT7 is set the same as OUT5 (see Figure 5.9): OUT7 = KEY EKEY – Echo Key Permissive Trip Permissive trip signal keyed by Echo logic (used in testing). 5-16 Trip and Target Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 203 Figure 5.6: POTT Logic Date Code 20001006 Trip and Target Logic 5-17 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 204: Variations For Permissive Underreaching Transfer Trip (Putt) Scheme

    Depending on the installation, perhaps one output contact (e.g., OUT5 = KEY) could be connected in parallel to both transmitter inputs (TX) on the communication equipment in Figure 5.9. Then output contact OUT7 can be used for another function. 5-18 Trip and Target Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 205: Date Code 20001006 Trip And Target Logic

    Figure 5.8: SEL-351 Relay Connections to Communications Equipment for a Two-Terminal Line POTT Scheme (Model 0351xT Example) Figure 5.9: SEL-351 Relay Connections to Communications Equipment for a Three-Terminal Line POTT Scheme (Model 0351xT Example) (DCUB) L IRECTIONAL OMPARISON NBLOCKING OGIC Enable the DCUB logic by setting ECOMM = DCUB1 or ECOMM = DCUB2.

  • Page 206: Use Existing Sel-321 Relay Dcub Application Guide For The Sel-351 Relay

    Use Existing SEL-321 Relay DCUB Application Guide for the SEL-351 Relay Use the existing SEL-321 Relay DCUB application guide (AG96-19) to help set up the SEL-351 Relay in a DCUB scheme (see preceding subsection Communications-Assisted Trip Logic - General Overview for more setting comparison information on the SEL-321/SEL-351 Relays).

  • Page 207: Timer Settings

    In three-terminal line DCUB applications (setting ECOMM = DCUB2), loss-of-guard signals are received from two remote terminals. Two optoisolated inputs on the SEL-351 Relay (e.g., input IN5 and IN7) are driven by communications equipment receiver outputs (see Figure 5.13). Make...
  • Page 208 Figure 5.1. When UBB asserts to logical 1, tripping is blocked. Figure 5.10: DCUB Logic 5-22 Trip and Target Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 209: Ptrx1, Ptrx2 - Permissive Trip Receive Outputs

    (TX) on the communication equipment in Figure 5.13. Then output contact OUT7 can be used for another function. Figure 5.12: SEL-351 Relay Connections to Communications Equipment for a Two-Terminal Line DCUB Scheme (Setting ECOMM = DCUB1); Model...

  • Page 210: Directional Comparison Blocking (Dcb) Logic

    Extends the received block signal by a settable time. Use Existing SEL-321 Relay DCB Application Guide for the SEL-351 Relay Use the existing SEL-321 Relay DCB application guide (AG93-06) to help set up the SEL-351 Relay in a DCB scheme (see preceding subsection Communications-Assisted Trip Logic –...

  • Page 211: Bt - Received Block Trip Signal(S)

    BT – Received Block Trip Signal(s) In two-terminal line DCB applications, a block trip signal is received from one remote terminal. One optoisolated input on the SEL-351 Relay (e.g., input IN4) is driven by a communications equipment receiver output (see Figure 5.15). Make SEL...

  • Page 212: Dstrt - Directional Carrier Start

    The received block trip input (e.g., BT = IN4) is routed through a dropout timer (BTXD) in the DCB logic in Figure 5.14. The timer output (BTX) is routed to the trip logic in Figure 5.1. 5-26 Trip and Target Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 213: Installation Variations

    OUT8 can be used for another function. Figure 5.16 also shows communication equipment RX (receive) output contacts from each remote terminal connected to separate inputs IN4 and IN6 on the SEL-351 Relay. The inputs operate as Date Code 20001006...
  • Page 214 An alternative to asserting the BT input is to change to a setting group where the DCB logic is not enabled. Figure 5.15: SEL-351 Relay Connections to Communications Equipment for a Two-Terminal Line DCB Scheme (Model 0351xT Example) Figure 5.16: SEL-351 Relay Connections to Communications Equipment for a...

  • Page 215: Front-Panel Target Leds

    RONT ANEL ARGET Table 5.1: SEL-351 Relay Front-Panel Target LED Definitions LED Label Definition Number Relay Enabled – see subsection Relay Self-Tests in Section 13: Testing and Troubleshooting TRIP Indication that a trip occurred, by overcurrent element, frequency element, or otherwise...

  • Page 216: Additional Target Led Information

    Port Communications and Commands) are used to trip via the serial port and they should illuminate the COMM target LED, set them in SEL Control Equation setting DTT: OGIC DTT = … + OC + RB1 5-30 Trip and Target Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 217: Sotf Target Led

    G target LED is illuminated at the rising edge of trip if a residual ground overcurrent element causes the trip or was picked up and timing to trip. Date Code 20001006 Trip and Target Logic 5-31 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 218: N Target Led

    (see Rotating Default Display in Sections 7 and 11, also): SV8 = (SV8 + SV7T)*!TRGTR DP3 = SV8 DP3_1 = BREAKER FAILURE DP3_0 = (blank) 5-32 Trip and Target Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 219 Pushbutton (Relay Word bit TRGTR pulses to logical 1, unlatching SV8 and in turn deasserting DP3). Thus, front-panel rotating default displays can be easily reset along with the front-panel targets by pushing the TARGET RESET Pushbutton. Date Code 20001006 Trip and Target Logic 5-33 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 220 Courtesy of NationalSwitchgear.com...
  • Page 221 Unlatch Reclose Supervision Logic (Bottom of Figure 6.2) .........6-9 Factory Settings Example....................6-10 Additional Settings Example 1..................6-10 SEL-351(1) Relay ....................6-11 SEL-351(2) Relay ....................6-11 Other Setting Considerations for SEL-351(1) and SEL-351(2) Relays ......6-11 Additional Settings Example 2..................6-12 Reclosing Relay........................6-12 Reclosing Relay States and General Operation..............6-13 Lockout State ......................6-14 Reclosing Relay States and Settings/Setting Group Changes ..........6-15...
  • Page 222 Figure 6.2: Reclose Supervision Logic (Following Open Interval Time-Out)........6-6 Figure 6.3: Reclose Supervision Limit Timer Operation (Refer to Bottom of Figure 6.2)......6-7 Figure 6.4: SEL-351 Relays Installed at Both Ends of a Transmission Line in a High-Speed Reclose Scheme......................6-10 Figure 6.5: Reclosing Relay States and General Operation ..............6-13 Figure 6.6: Reclosing Sequence From Reset to Lockout With Factory Settings ........6-17...

  • Page 223: Section 6: Close And Reclose Logic

    (e.g., manual close initiation via serial port or optoisolated inputs). If automatic reclosing is not needed, but the SEL-351 Relay is to close the circuit breaker for other close conditions (e.g., manual close initiation via serial port or optoisolated inputs), then this subsection is the only subsection that needs to be read in this section ®...

  • Page 224: Set Close

    Note: CLOSE Command no longer embedded in Close Logic In previous firmware versions of the SEL-351 Relay, the CLOSE command was embedded in the close logic in Figure 6.1. The CLOSE command was routed directly into the same OR logic gate as Reclosing Relay Open Interval Time-out and SEL...

  • Page 225: Unlatch Close

    CLOSE command into the close logic. But, this is no problem - just a redundancy in logic. Thus, SEL-351 Relays with various firmware versions can be set the same with respect to setting CL = … + CC.

  • Page 226: Set Close

    Relay Word bit 52A. This makes for convenience in setting other Control Equations. For example, if the following setting is made: OGIC 52A = IN1 (52a auxiliary contact wired to input IN1) Close and Reclose Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 227: Program An Output Contact For Closing

    CLOSE Relay Word bit to logical 1. This input into the close logic in Figure 6.1 is an output of the reclose supervision logic in the following Figure 6.2. Date Code 20001006 Close and Reclose Logic SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 228 Figure 6.2: Reclose Supervision Logic (Following Open Interval Time-Out) Close and Reclose Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 229 Figure 6.3: Reclose Supervision Limit Timer Operation (Refer to Bottom of Figure 6.2) Date Code 20001006 Close and Reclose Logic SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 230: Settings And General Operation

    If 79CLS asserts to logical 1 at any time during this 79CLSD time window, then the now-qualified open interval time-out will propagate onto the final close logic in Figure 6.1 to automatically reclose the circuit breaker. Close and Reclose Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 231: Set Reclose Supervision Logic (Bottom Of Figure 6.2)

    79CLSD = OFF, reclose supervision condition 79CLS is not time limited. When an open interval times out, reclose supervision condition 79CLS is checked indefinitely until one of the other above unlatch conditions comes true. Date Code 20001006 Close and Reclose Logic SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 232: Factory Settings Example

    Refer to the top of Figure 6.2 and Figure 6.4. SEL-351 Relays are installed at both ends of a transmission line in a high-speed reclose scheme. After both circuit breakers open for a transmission line fault, the SEL-351(1) Relay recloses circuit breaker 52/1 first, followed by the SEL-351(2) Relay reclosing circuit breaker 52/2, after a synchronism check across circuit breaker 52/2.

  • Page 233: Sel-351(1) Relay

    = monitored single-phase transmission line voltage (channel VS) is dead SEL-351(2) Relay The SEL-351(2) Relay checks that Bus 2 voltage is hot, the transmission line voltage is hot, and in synchronism after the reclosing relay open interval times out, before allowing circuit breaker 52/2 to be reclosed.

  • Page 234: Additional Settings Example 2

    52/1 is tripped again. If channel VS of the SEL-351(2) Relay is connected to one of these briefly energized phases, synchronism check element 25A1 could momentarily assert to logical 1.

  • Page 235: Reclosing Relay States And General Operation

    Relay Word bit asserts to logical 1, and the LED illuminates. Automatic reclosing only takes place when the relay is in the Reclose Cycle State. Date Code 20001006 Close and Reclose Logic 6-13 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 236: Lockout State

    Figure 6.3). Note: OPEN Command no longer embedded in Drive-to-Lockout Logic In previous firmware versions of the SEL-351 Relay (except the original release), the OPEN command was embedded to drive the reclosing relay to lockout (see Appendix A). The OPEN command is no longer directly embedded in the reclosing relay logic. It is also no longer directly embedded in the trip logic (see the Note following Figure 5.2).

  • Page 237: Reclosing Relay States And Settings/Setting Group Changes

    (the shot counter is explained later in this section). • The front-panel LEDs RS, CY, and LO are all extinguished — a ready indication that the recloser is defeated. Date Code 20001006 Close and Reclose Logic 6-15 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 238: Close Logic Can Still Operate When The Reclosing Relay Is Defeated

    In the factory settings in Table 6.2, the open interval 3 time setting 79OI3 is the first open interval time setting set equal to zero: 79OI3 = 0.00 cycles 6-16 Close and Reclose Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 239: Determination Of Number Of Reclosures (Last Shot)

    For this example: Number of reclosures (last shot) = 2 = the number of set open interval times that precede the first open interval set to zero. Date Code 20001006 Close and Reclose Logic 6-17 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 240: Observe Shot Counter Operation

    79RSD, if desired). SEL Control Equation setting 79BRS (block reset timing) OGIC can be set to control reset timing [see Block Reset Timing Setting (79BRS) later in this subsection]. 6-18 Close and Reclose Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 241: Monitoring Open Interval And Reset Timing

    When the shot counter is at a particular shot value (e.g., shot = 2), the corresponding Relay Word bit asserts to logical 1 (e.g., SH2 = logical 1). Date Code 20001006 Close and Reclose Logic 6-19 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 242: Reclosing Relay Sel Ogic Control Equation Settings Overview

    Input IN1 is assigned as the breaker status input in the factory settings (52A = IN1). The circuit breaker has to be closed (circuit breaker status 52A = logical 1) at the instant of the first trip of the auto-reclose cycle in order for the SEL-351 to successfully initiate reclosing and 6-20...

  • Page 243: Additional Settings Example

    The SEL-351 is not yet in the reclose cycle state (79CY = logical 0) at the instant of the first trip. Then for any subsequent trip operations in the auto-reclose cycle, the SEL-351 is in the reclose cycle state (79CY = logical 1) and the SEL-351 successfully initiates reclosing for each trip.

  • Page 244: Other Settings Considerations

    Additional Settings Example in the preceding setting 79RI [reclose initiation] discussion). Then the drive-to-lockout condition overlaps reclose initiation and the SEL-351 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 earlier in this subsection).
  • Page 245 Word bit IN2 = logical 0) or local bit LB3 (manual trip switch) is operated, then the relay is driven to the Lockout State (by setting 79DTL) and, subsequently, last shot (by setting 79DLS). Date Code 20001006 Close and Reclose Logic 6-23 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 246: Additional Settings Example 2

    Lockout State if the circuit breaker is open (see Lockout State earlier in this subsection). 6-24 Close and Reclose Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 247: Factory Settings Example

    = 0 to shot = 1. Then, open interval 1 time (setting 79OI1) is skipped, and the relay times on the open interval 2 time (setting 79OI2) instead. Date Code 20001006 Close and Reclose Logic 6-25 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 248: Additional Settings Example 2

    = logical 0, regardless of Relay Word bit 50P2. Additional Settings Example 2 If the SEL-351 Relay is used 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. To monitor line voltage and block reclosing, connect a line-side single-phase potential transformer to channel VS on the SEL-351 Relay as shown in Figure 6.7.

  • Page 249: Additional Settings Example 3

    Relay Word bit 79CY corresponds to the Reclose Cycle State. The reclosing relay is in one of the three reclosing relay states at any one time (see Figure 6.5 and Table 6.1). Date Code 20001006 Close and Reclose Logic 6-27 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 250: Additional Settings Example 1

    (e.g., line recloser – see Figure 6.8) has operated to clear a fault. Incrementing the shot counter keeps the SEL-351 Relay “in step” with the downstream device, as is shown in the following Additional Settings Examples 1 and Additional Settings Examples 2.

  • Page 251: Factory Settings Example

    Reset State (79RS = logical 1). Refer to Figure 6.8 and Figure 6.9. Figure 6.8: Sequence Coordination Between the SEL-351 Relay and a Line Recloser Date Code 20001006 Close and Reclose Logic...
  • Page 252 Figure 6.9: Operation of SEL-351 Relay Shot Counter for Sequence Coordination With Line Recloser (Additional Settings Example 1) If the SEL-351 Relay is in the Reset State (79RS = logical 1) and then a permanent fault beyond the line recloser occurs (fault current I in Figure 6.8), the line recloser fast curve operates to clear...

  • Page 253: Additional Settings Example 2

    Refer to Figure 6.10. If the SEL-351 Relay is in the Reset State (79RS = logical 0) with the shot counter reset (shot = 0; SH0 = logical 1) and then a permanent fault beyond the line recloser occurs (fault current I Figure 6.8), the line recloser fast curve operates to clear the fault.

  • Page 254: Reclose Supervision Setting (79Cls)

    The shot counter stays at shot = 1. Thus, if there is a coincident fault between the SEL-351 Relay and the line recloser, the SEL-351 Relay will operate on 51AT, 51BT, or 51CT and then reclose once, instead of going straight to the Lockout State (shot = 1 <...
  • Page 255 Operation of Serial Port GROUP Command and Front-Panel GROUP Pushbutton...7-22 Relay Disabled Momentarily During Active Setting Group Change........7-23 Active Setting Group Switching Example 1 ..............7-23 Start Out in Setting Group 1 ..................7-25 Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 256 Setting Group 1 is the Active Setting Group.............7-44 Reclosing Relay Enabled..................7-44 Reclosing Relay Disabled.................7-44 Switch to Setting Group 4 as the Active Setting Group..........7-45 Additional Rotating Default Display Example..............7-45 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 257 Group Switching (Model 0351xT Example) ..............7-27 Figure 7.24: Active Setting Group Switching (With Rotating Selector Switch) Time Line....7-29 Figure 7.25: SEL Control Equation Variables/Timers SV1/SV1T Through SV6/SV6T....7-31 OGIC Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 258 0351x1 and 0351xY)....................7-38 Figure 7.31: Traditional Panel Light Installations (Model 0351xT Example) ........7-39 Figure 7.32: Rotating Default Display Replaces Traditional Panel Light Installations (Model 0351xT Example).....................7-40 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 259: Section 7: Inputs, Outputs, Timers, And Other Control Logic

    IN8 in Figure 7.1) that follow corresponding optoisolated inputs (e.g., optoisolated inputs IN1 through IN8 in Figure 7.1) for the different SEL-351 Relay models. The figures show examples of energized and deenergized optoisolated inputs and corresponding Relay Word bit states.
  • Page 260 Figure 7.1: Example Operation of Optoisolated Inputs IN1 Through IN8 (Model 0351xT) Figure 7.2: Example Operation of Optoisolated Inputs IN101 Through IN106 (Models 0351x0, 0351x1, and 0351xY) Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 261: Input Debounce Timers

    1/4-cycle [e.g., if setting IN5D = 0.13, internally the timer runs at the nearest 1/16-cycle: 2/16-cycles (2/16 = 0.1250)]. Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 262: Input Functions

    Input IN1 Relay Word bit IN1 is used in the factory settings for the SEL Control Equation circuit OGIC breaker status setting: 52A = IN1 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 263: Input In2

    Input IN2 is also used in the factory setting DP1 (see Rotating Default Displays at the end of this section). The pickup/dropout timer for input IN2 (IN2D) is set at: IN2D = 1.00 cycle to provide input energization/deenergization debounce. Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 264: Details On The Remote Control Switch Momentary Position

    Operate the eight (8) local control switches using the front-panel keyboard/display (see Section 11: Front-Panel Interface). Figure 7.5: Local Control Switches Drive Local Bits LB1 Through LB8 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 265: Local Control Switch Types

    The local bit LBn is maintained in the OFF (LBn = logical 0) position and pulses to the MOMENTARY (LBn = logical 1) position for one processing interval (1/4 cycle). Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 266: On/Off/Momentary Switch

    Table 7.2: Correspondence Between Local Control Switch Types and Required Label Settings Label PLBn Local Switch Type Label NLBn Label CLBn Label SLBn ON/OFF OFF/MOMENTARY ON/OFF/MOMENTARY Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 267: Factory Settings Examples

    To keep reclosing from being initiated for this trip, set local bit LB3 to drive the reclosing relay to lockout for a manual trip (see Section 6: Close and Reclose Logic): 79DTL = ... + LB3 Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 268: Additional Local Control Switch Application Ideas

    If power is lost to the panel, the front-panel control switch positions remain unchanged. 7-10 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 269: Settings Change Or Active Setting Group Change

    Any given remote control switch can be put in one of the following three positions: (logical 1) (logical 0) MOMENTARY (logical 1 for one processing interval) Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic 7-11 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 270: Remote Bit Application Ideas

    \RB3 (falling edge operator) will assert for one processing interval. See CON Command (Control Remote Bit) in Section 10: Serial Port Communications and Commands. 7-12 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 271 (e.g., SCADA, RTU). Figure 7.12: Traditional Latching Relay The eight (8) latch control switches in the SEL-351 Relay provide latching relay type functions. Figure 7.13: Latch Control Switches Drive Latch Bits LT1 Through LT8 The output of the latch control switch in Figure 7.13 is a Relay Word bit LTn (n = 1 through 8),...

  • Page 272: Latch Control Switch Application Ideas

    SEL-351 Relay. Reclosing Relay Enable/Disable Setting Example Use a latch control switch to enable/disable the reclosing relay in the SEL-351 Relay. In this example, a SCADA contact is connected to optoisolated input IN4. Each pulse of the SCADA contact changes the state of the reclosing relay.

  • Page 273: Feedback Control

    IN4 should only change the state of the latch control switch once (e.g., latch bit LT1 changes state from logical 0 to logical 1). Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic 7-15 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 274 IN4D. Thus, when using Relay Word bit IN4 in Figure 7.13 and Figure 7.14 and associated SEL Control Equations, keep in mind any time delay produced by the OGIC input pickup/dropout debounce timer IN4D. 7-16 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 275: Use A Remote Bit Instead To Enable/Disable The Reclosing Relay

    Port Communications and Commands for more information on remote bits. These are just a few control logic examples — many variations are possible. Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic 7-17 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 276: Latch Control Switch States Retained

    Make the following SEL Control Equation settings in setting Group 4: OGIC SV7 = SG4 RST2 = !SV7T + ... [= NOT(SV7T) + ...] 7-18 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 277: Note: Make Latch Control Switch Settings With Care

    Note that the rising edge operators in the SET1 and RST1 settings keep latch bit LT1 from cyclically operating for any single assertion of the SCADA contact. Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic 7-19 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 278 Figure 7.18: Latch Control Switch (With Time Delay Feedback) Controlled by a Single Input to Enable/Disable Reclosing Figure 7.19: Latch Control Switch (With Time Delay Feedback) Operation Time Line 7-20 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 279: Multiple Setting Groups

    Control Equation settings SS1 through SS6 have priority over the serial port GROUP OGIC command and the front-panel GROUP pushbutton in selecting the active setting group. Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic 7-21 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 280: Ogic

    0, the serial port GROUP command or the front-panel GROUP pushbutton can be used to switch the active setting group. 7-22 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 281: Relay Disabled Momentarily During Active Setting Group Change

    (i.e., corresponding output contact coils deenergized). Active Setting Group Switching Example 1 Use a single optoisolated input to switch between two setting groups in the SEL-351 Relay. In this example, optoisolated input IN5 on the relay is connected to a SCADA contact in Figure 7.20.
  • Page 282 The timers reset during the setting group change, allowing the same timer to be used in both setting groups. 7-24 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 283: Start Out In Setting Group 1

    Group 1 after qualifying time setting TGR (perhaps set at a cycle or so to qualify the assertion of setting SS1). Optoisolated input IN5 also has its own built-in debounce timer (IN5D) available (see Figure 7.1). Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic 7-25 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 284 Table 7.6: Active Setting Group Switching Input Logic Input States Active Setting Group Remote Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 7-26 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 285 The SEL-351 Relay can be programmed to operate similarly. Use three optoisolated inputs to switch between the six setting groups in the SEL-351 Relay. In this example, optoisolated inputs IN1, IN2, and IN3 on the relay are connected to a rotating selector switch in Figure 7.23.

  • Page 286: Selector Switch Now Rests On Position Remote

    With settings SS1 through SS6 all at logical 0, the serial port GROUP command or the front-panel GROUP pushbutton can be used to switch the active setting group from Group 5, in this example, to another desired setting group. 7-28 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 287: Active Setting Group Retained

    If individual settings are changed for a setting group other than the active setting group, there is no interruption of the active setting group (the relay is not momentarily disabled). Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic 7-29 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 288: Note: Make Active Setting Group Switching Settings With Care

    0.00 - 16000.00 cycles in 0.25-cycle increments These timer setting ranges apply to both pickup and dropout times (SVnPU and SVnDO, n = 1 through 16). 7-30 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 289 Figure 7.25: SEL Control Equation Variables/Timers SV1/SV1T Through SV6/SV6T OGIC Figure 7.26: SEL Control Equation Variables/Timers SV7/SV7T Through OGIC SV16/SV16T Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic 7-31 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 290: Factory Settings Example

    Control Equation setting SV7 being set equal to OGIC Relay Word bit SV7 (SEL Control Equation variable SV7): OGIC SV7 = (SV7 + IN1)*(50P1 + 50N1) 7-32 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 291: Timers Reset When Power Is Lost, Settings Are Changed, Or Active Setting Group Is Changed

    0 (assuming input IN1 is not asserted). Relay Word bit SV7T is also reset to logical 0, and timer settings SV7PU and SV7DO load up again. Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic 7-33 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 292: Output Contacts

    Control Equation setting OUTm (m = 1 through 11) to logical 1 also asserts the corresponding Relay Word bit OUTm (m = 1 through 11) to logical 1. 7-34 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 293: Alarm Output Contact

    (energized or deenergized) and output contact types (a or b) are demonstrated. See Output Contact Jumpers in Section 2: Installation for output contact type options. Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic 7-35 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 294 Figure 7.28: Logic Flow for Example Output Contact Operation (Model 0351xT) 7-36 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 295 Figure 7.29: Logic Flow for Example Output Contact Operation (Models 0351x0, 0351x1, and 0351xY) Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic 7-37 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 296: Rotating Default Display

    SCADA contacts, etc. They indicate such conditions as: circuit breaker open/closed reclosing relay enabled/disabled 7-38 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 297: Traditional Indicating Panel Lights

    Traditional Indicating Panel Lights Replaced with Rotating Default Display The indicating panel lights are not needed if the rotating default display feature in the SEL-351 Relay is used. Figure 7.32 shows the elimination of the indicating panel lights by using the rotating default display.

  • Page 298: General Operation Of Rotating Default Display Settings

    Figure 7.32: Rotating Default Display Replaces Traditional Panel Light Installations (Model 0351xT Example) There are eight (8) of these default displays available in the SEL-351 Relay. Each default display has two complementary screens (e.g., BREAKER CLOSED and BREAKER OPEN) available.

  • Page 299: Reclosing Relay Enabled

    Make corresponding, complementary text settings: DP2_1 = BREAKER CLOSED DP2_0 = BREAKER OPEN Display point setting DP2 controls the display of the text settings. Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic 7-41 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 300: Circuit Breaker Closed

    In Figure 7.32, optoisolated input IN1 is energized when the 52a circuit breaker auxiliary contact is closed, resulting in: 52A = IN1 = logical 1 DP2 = 52A = logical 1 7-42 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 301: Circuit Breaker Open

    0 (logical 0) or 1 (logical 1) and the corresponding text setting. For example, if an SEL-351 Relay is protecting a 12 kV distribution feeder, labeled “Feeder 1204,” the feeder name can be continually displayed with the following settings...

  • Page 302: Active Setting Group Switching Considerations

    This results in the display of corresponding text setting DP1_0 on the front-panel display: 79 DISABLED Now the active setting group is switched from setting Group 1 to 4. 7-44 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 303: Switch To Setting Group 4 As The Active Setting Group

    See Figure 5.17 and accompanying text in Section 5: Trip and Target Logic for an example of resetting a rotating default display with the TARGET RESET pushbutton. Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic 7-45 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 304 Courtesy of NationalSwitchgear.com...
  • Page 305 Rolling Demand Meter Response (EDEM = ROL) ...........8-22 Time = 0 Minutes.....................8-23 Time = 5 Minutes.....................8-23 Time = 10 Minutes...................8-24 Time = 15 Minutes...................8-24 Date Code 20001006 Breaker Monitor, Metering, and Load Profile Functions SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 306 FIGURES Figure 8.1: Plotted Breaker Maintenance Points for a 25 kV Circuit Breaker ........8-3 Figure 8.2: SEL-351 Relay Breaker Maintenance Curve for a 25 kV Circuit Breaker ......8-5 Figure 8.3: Operation of SEL Control Equation Breaker Monitor Initiation Setting ......8-6 OGIC Figure 8.4: Breaker Monitor Accumulates 10% Wear .................8-8...

  • Page 307: Section 8: Breaker Monitor, Metering, And Load Profile Functions

    This section explains these functions in detail. REAKER ONITOR The breaker monitor in the SEL-351 Relay helps in scheduling circuit breaker maintenance. The breaker monitor is enabled with the enable setting: EBMON = Y The breaker monitor settings in Table 8.2 are available via the SET G and SET L commands (see Table 9.1 in Section 9: Setting the Relay and also Settings Sheet 18 of 22 at the end of Section...
  • Page 308 The breaker maintenance information in Table 8.1 is plotted in Figure 8.1. Connect the plotted points in Figure 8.1 for a breaker maintenance curve. To estimate this breaker maintenance curve in the SEL-351 Relay breaker monitor, three set points are entered: Set Point 1 maximum number of close/open operations with corresponding current interruption level.
  • Page 309 Figure 8.1: Plotted Breaker Maintenance Points for a 25 kV Circuit Breaker Date Code 20001006 Breaker Monitor, Metering, and Load Profile Functions SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 310: Breaker Monitor Setting Example

    A, B, and C don’t necessarily interrupt the same magnitude current (depending on fault type and loading). Breaker Monitor, Metering, and Load Profile Functions Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 311 Figure 8.2: SEL-351 Relay Breaker Maintenance Curve for a 25 kV Circuit Breaker Date Code 20001006 Breaker Monitor, Metering, and Load Profile Functions SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 312: Operation Of Sel Ogic ® Control Equation Breaker Monitor Initiation Setting

    See Figure 8.8 and accompanying text for more information on setting BKMON. The operation of the breaker monitor maintenance curve, when new current values are read in, is explained in the following example. Breaker Monitor, Metering, and Load Profile Functions Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 313: Breaker Monitor Operation Example

    BRE R command. Additionally, logic outputs assert for alarm or other control applications – see the following discussion. Date Code 20001006 Breaker Monitor, Metering, and Load Profile Functions SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 314 Figure 8.4: Breaker Monitor Accumulates 10% Wear Breaker Monitor, Metering, and Load Profile Functions Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 315 Figure 8.5: Breaker Monitor Accumulates 25% Wear Date Code 20001006 Breaker Monitor, Metering, and Load Profile Functions SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 316 Figure 8.6: Breaker Monitor Accumulates 50% Wear 8-10 Breaker Monitor, Metering, and Load Profile Functions Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 317 Figure 8.7: Breaker Monitor Accumulates 100% Wear Date Code 20001006 Breaker Monitor, Metering, and Load Profile Functions 8-11 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 318: Breaker Monitor Output

    Relay Word bit BCWA asserts (BCWA = logical 1). Execution of the BRE R command resets the wear levels for all three phases back to 0% and consequently causes Relay Word bit BCWA to deassert (BCWA = logical 0). 8-12 Breaker Monitor, Metering, and Load Profile Functions Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 319: Via Front Panel

    Note that optoisolated input IN7 monitors the trip bus. If the trip bus is energized by output contact OUT1, an external control switch, or some other external trip, then IN7 is asserted. Date Code 20001006 Breaker Monitor, Metering, and Load Profile Functions 8-13 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 320: Station Dc Battery Monitor

    ATTERY ONITOR The station dc battery monitor in the SEL-351 Relay 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. The monitor measures the station dc battery voltage applied to the rear-panel terminals labeled POWER (see Figures 2.2, 2.3, and 2.4).

  • Page 321: Dc Under- And Overvoltage Elements

    20 to 300 Vdc, 1 Vdc increments This range allows the SEL-351 Relay to monitor nominal battery voltages of 24, 48, 110, 125, and 250 V. When testing the pickup settings DCLOP and DCHIP, do not operate the SEL-351 Relay outside of its power supply limits.

  • Page 322: Dclo < Dchi (Top Of Figure 8.10)

    (all output contacts deassert on total loss of power). Thus, the resultant dc voltage element at the bottom of Figure 8.10 would probably be a better choice – see following discussion. 8-16 Breaker Monitor, Metering, and Load Profile Functions Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 323: Dclo > Dchi (Bottom Of Figure 8.10)

    For example, if the station dc batteries have a problem and the station dc battery voltage is declining, drive the reclosing relay to lockout: 79DTL = !SV4T + ... [= NOT(SV4T) + ...] Date Code 20001006 Breaker Monitor, Metering, and Load Profile Functions 8-17 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 324: View Station Dc Battery Voltage

    Anytime the trip bus is energized, any dip in station dc battery voltage can be observed in column Vdc in the event report. 8-18 Breaker Monitor, Metering, and Load Profile Functions Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 325: Station Dc Battery Voltage Dips During Circuit Breaker Closing

    Operation of Station DC Battery Monitor When AC Voltage is Powering the Relay If the SEL-351 Relay has a 125/250 Vac/Vdc supply, it can be powered by ac voltage (85 to 264 Vac) connected to the rear-panel terminals labeled POWER. When powering the relay with ac voltage, the dc voltage elements in Figure 8.9 see the average of the sampled ac voltage powering...

  • Page 326: Demand Metering

    EMAND ETERING The SEL-351 Relay offers the choice between two types of demand metering, settable with the enable setting: EDEM = THM (Thermal Demand Meter) EDEM = ROL (Rolling Demand Meter) The demand metering settings (in Table 8.3) are available via the SET command (see Table 9.1 in Section 9: Setting the Relay and also Settings Sheet 10 of 22 at the end of Section 9).
  • Page 327 Figure 8.11: Response of Thermal and Rolling Demand Meters to a Step Input (setting DMTC = 15 minutes) Date Code 20001006 Breaker Monitor, Metering, and Load Profile Functions 8-21 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 328: Thermal Demand Meter Response (Edem = Thm)

    (middle) is at 90% (0.9 per unit) of full applied value (1.0 per unit) after a time period equal to setting DMTC = 15 minutes, referenced to when the step current input is first applied. The SEL-351 Relay updates thermal demand values approximately every 2 seconds. Rolling Demand Meter Response (EDEM = ROL) The response of the rolling demand meter in Figure 8.11 (bottom) to the step current input (top) is...

  • Page 329: Time = 0 Minutes

    1.0 per unit 0 to 5 minutes 1.0 per unit Rolling demand meter response at “Time = 5 minutes” = 1.0/3 = 0.33 per unit Date Code 20001006 Breaker Monitor, Metering, and Load Profile Functions 8-23 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 330: Time = 10 Minutes

    Note: Changing setting EDEM or DMTC resets the demand meter values to zero. This also applies to changing the active setting group, and setting EDEM or DMTC is different in 8-24 Breaker Monitor, Metering, and Load Profile Functions Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 331 (PDEM, NDEM, GDEM, and QDEM) to alarm for high loading or unbalance conditions. Use in other schemes such as the following example. Figure 8.13: Demand Current Logic Outputs Date Code 20001006 Breaker Monitor, Metering, and Load Profile Functions 8-25 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 332: Demand Current Logic Output Application - Raise Pickup For Unbalance Current

    !GDEM + GDEM*50G5 Refer to Figure 8.13, Figure 8.14, and Figure 3.19. Figure 8.14: Raise Pickup of Residual Ground Time-Overcurrent Element for Unbalance Current 8-26 Breaker Monitor, Metering, and Load Profile Functions Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 333: Residual Ground Demand Current Below Pickup Gdemp

    NOT(logical 0) + (logical 0)*50G5 = logical 1 Thus, the residual ground time-overcurrent element 51GT operates on its standard pickup again: 51GP 1.50 A secondary Date Code 20001006 Breaker Monitor, Metering, and Load Profile Functions 8-27 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 334: View Or Reset Demand Metering Information

    Figure 11.2 in Section 11: Front-Panel Interface. Demand Metering Updating and Storage The SEL-351 Relay updates demand values approximately every 2 seconds. The relay stores peak demand values to nonvolatile storage once per day (it overwrites the previous stored value if it is exceeded). Should the relay lose control power, it will restore the peak demand values saved by the relay at 23:50 hours on the previous day.

  • Page 335: Via Front Panel

    MET M and MET RM are also available via the front-panel METER pushbutton. See Figure 11.2 in Section 11: Front-Panel Interface. Maximum/Minimum Metering Updating and Storage The SEL-351 Relay updates maximum/minimum values, if the following conditions are met: • Control Equation setting FAULT is deasserted (= logical 0).
  • Page 336 Megawatt and megavar values are subject to the above voltage and current thresholds. The SEL-351 Relay stores maximum/minimum values to nonvolatile storage once per day (it overwrites the previous stored value if it is exceeded). Should the relay lose control power, it will restore the maximum/minimum values saved by the relay at 23:50 hours on the previous day.
  • Page 337 When the buffer fills up, newer records overwrite older records. The SEL-351 is able to store at least 13 days of data at an LDAR of 5 minutes, if all 15 values are used (some units manufactured prior to 1998 have a reduced memory capacity).
  • Page 338 07/23/96 07:00:35 xxxxx.xxx xxxxx.xxx xxxxx.xxx xxxxx.xxx xxxxx.xxx ... xxxxx.xxx 07/23/96 08:00:15 xxxxx.xxx xxxxx.xxx xxxxx.xxx xxxxx.xxx xxxxx.xxx ... xxxxx.xxx 07/23/96 09:00:01 xxxxx.xxx xxxxx.xxx xxxxx.xxx xxxxx.xxx xxxxx.xxx ... xxxxx.xxx <ETX> => 8-32 Breaker Monitor, Metering, and Load Profile Functions Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 339: Clearing The Load Profile Buffer

    Clear the load profile buffer Are you sure (Y/N) ? Y <ENTER> Clearing Complete Changing the LDLIST setting will also result in the buffer being cleared. Date Code 20001006 Breaker Monitor, Metering, and Load Profile Functions 8-33 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 340 Courtesy of NationalSwitchgear.com...
  • Page 341 Table 9.4: SEL-351 Relay Model 0351xT Relay Word Bits...............9-7 Table 9.5: Relay Word Bit Additions for SEL-351 Relay Model 0351xT, Firmware Versions 1 and Greater........................9-8 Table 9.6: Relay Word Bit Differences in any SEL-351 Relay Models 0351xT With Delta- Connected Voltage Inputs as Compared to Table 9.4 and Table 9.5.
  • Page 342 Figure 9.7: I.E.C. Class B Curve (Very Inverse): C2................9-5 Figure 9.8: I.E.C. Class C Curve (Extremely Inverse): C3..............9-6 Figure 9.9: I.E.C. Long-Time Inverse Curve: C4................9-6 Figure 9.10: I.E.C. Short-Time Inverse Curve: C5 ................9-6 Setting the Relay Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 343: Section 9: Setting The Relay

    Front-Panel Interface for information on front-panel communications. ETTINGS HANGES VIA THE ERIAL Note: In this manual, commands you type appear in bold/uppercase: OTTER. Computer keys you press appear in bold/uppercase/brackets: <ENTER>. Date Code 20001006 Setting the Relay SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 344 (for “b” contact, opens for an “a”; see Figure 7.28 and 7.29), but the EN LED remains on (see Table 5.1) while the new settings are saved. Setting the Relay Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 345: Time-Overcurrent Curves

    I.E.C. Long-Time Inverse Curve: C4 tp = TD*(80.0/(M -1)) tp = TD*(120.0/(M-1)) tr = TD*(80.0/(1-M tr = TD*(120.0/(1-M)) I.E.C. Short-Time Inverse Curve: C5 0.04 tp = TD*(0.05/(M -1)) tr = TD*(4.85/(1-M Date Code 20001006 Setting the Relay SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 346 Figure 9.1: U.S. Moderately Inverse Curve: U1 Figure 9.2: U.S. Inverse Curve: U2 Figure 9.3: U.S. Very Inverse Curve: U3 Figure 9.4: U.S. Extremely Inverse Curve: U4 Setting the Relay Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 347 Figure 9.5: U.S. Short-Time Inverse Curve: U5 Figure 9.6: I.E.C. Class A Curve (Standard Figure 9.7: I.E.C. Class B Curve (Very Inverse): C1 Inverse): C2 Date Code 20001006 Setting the Relay SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 348 6 (5) 0.20 3 (2.5) 0.10 0.05 DWG. M300G153 .5 .6 .7 .8 .9 5 6 7 8 9 Multiples of Pickup Figure 9.10: I.E.C. Short-Time Inverse Curve: C5 Setting the Relay Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 349: Relay Word Bits (Used In Sel Ogic ® Control Equations)

    0351x0, 0351x1, and 0351xY, where x is the Tables 9.7 and 9.8. firmware version number. 0351x0, 0351x1 and 0351xY with delta-connected Differences are listed in 9.9. voltage inputs. Table 9.4: SEL-351 Relay Model 0351xT Relay Word Bits. Relay Word Bits 50A1 50B1 50C1 50A2...
  • Page 350 2.15 and 7.28). 2. M ™ elements only valid in Firmware Versions 1 or greater (rows 42 through 45). IRRORED Table 9.5: Relay Word Bit Additions for SEL-351 Relay Model 0351xT, Firmware Versions 1 and Greater. Relay Word Bits LBOKB...
  • Page 351 Table 9.6: Relay Word Bit Differences in any SEL-351 Relay Models 0351xT With Delta-Connected Voltage Inputs as Compared to Table 9.4 and Table 9.5. Relay Word Bits 27AB1 27BC1 27CA1 27AB2 27BC2 27CA2 59AB1 59BC1 59CA1 59AB2 59BC2 59CA2 59Q1...
  • Page 352 2. Sag, Swell, and Interruption elements only valid in Firmware Versions 3 and 4. Table 9.9: Relay Word Bit Differences in any SEL-351 Relay Models 0351x0, 0351x1, and 0351xY With Delta-Connected Voltage Inputs as Compared to Table 9.7 and Table 9.8...
  • Page 353 Table 9.10: Relay Word Bit Definitions for SEL-351 Row numbers for Model 0351xT. Row numbers in parenthesis indicate corresponding row number on Models 0351x0, 0351x1, and 0351xY, if different. Primary Definition Application 50A1 Level 1 A-phase instantaneous overcurrent element Tripping, (A-phase current above pickup setting 50P1P;...
  • Page 354 (BC-phase-to-phase current above pickup setting 50PP4P; see Figure 3.7) 50CA4 Level 4 CA-phase-to-phase instantaneous overcurrent element (CA-phase-to-phase current above pickup setting 50PP4P; see Figure 3.7) 9-12 Setting the Relay Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 355 Phase time-overcurrent element 51PT reset (see Testing Figure 3.14) Neutral ground current (channel IN) above pickup Testing, Control setting 51NP for neutral ground time-overcurrent element 51NT (see Figure 3.18) Date Code 20001006 Setting the Relay 9-13 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 356 [neutral ground current (channel IN) above pickup setting 50N3P; see Figure 3.8] 50N4 Level 4 neutral ground instantaneous overcurrent element [neutral ground current (channel IN) above pickup setting 50N4P; see Figure 3.8] 9-14 Setting the Relay Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 357 67N3T timed out (derived from 67N3; see Figure 3.8) 67N4T Level 4 neutral ground definite-time overcurrent element 67N4T timed out (derived from 67N4; see Figure 3.8) Date Code 20001006 Setting the Relay 9-15 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 358 Level 4 residual ground instantaneous overcurrent element (derived from 50G4; see Figure 3.10) 67Q1 Level 1 negative-sequence instantaneous overcurrent Testing, Control element (derived from 50Q1; see Figure 3.12) 9-16 Setting the Relay Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 359 (maximum phase current above pickup setting Control 50P5P; see Figure 3.2) 50P6 Level 6 phase instantaneous overcurrent element (maximum phase current above pickup setting 50P6P; see Figure 3.2) Date Code 20001006 Setting the Relay 9-17 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 360 Internal enable for channel IN current-polarized directional element (see Figures 4.4 and 4.6) 32QE Internal enable for negative-sequence voltage- polarized directional element (see Figures 4.5 and 4.13) 9-18 Setting the Relay Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 361 (see Figures 4.4 and 4.11) 32GR Reverse directional control routed to neutral ground and residual ground overcurrent elements (see Figures 4.4 and 4.11) Date Code 20001006 Setting the Relay 9-19 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 362 C-phase instantaneous overvoltage element (C-phase voltage above pickup setting 59P2P; see Figure 3.21) 27AB AB-phase-to-phase instantaneous undervoltage element (AB-phase-to-phase voltage below pickup setting 27PP; see Figure 3.22) 9-20 Setting the Relay Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 363 (channel VS voltage above pickup setting 59S2P; see Figure 3.25) 59VP Phase voltage window element [selected phase Testing voltage (VP) between threshold settings 25VLO and 25VHI; see Figure 3.26] Date Code 20001006 Setting the Relay 9-21 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 364 (any phase voltage below pickup setting 27B81P; see Figure 3.29) Phase instantaneous overcurrent element for load detection (maximum phase current above pickup setting 50LP; see Figure 5.3) 9-22 Setting the Relay Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 365 Optoisolated input IN104 asserted (see Figure 7.2) IN103 Optoisolated input IN103 asserted (see Figure 7.2) IN102 Optoisolated input IN102 asserted (see Figure 7.2) IN101 Optoisolated input IN101 asserted (see Figure 7.2) Date Code 20001006 Setting the Relay 9-23 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 366 OGIC asserted (see Figure 7.25) Control Equation variable timer input SV3 OGIC asserted (see Figure 7.25) Control Equation variable timer input SV4 OGIC asserted (see Figure 7.25) 9-24 Setting the Relay Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 367 SV12 asserted (see Figure 7.26) SV9T Control Equation variable timer output Control OGIC SV9T asserted (see Figure 7.26) SV10T Control Equation variable timer output OGIC SV10T asserted (see Figure 7.26) Date Code 20001006 Setting the Relay 9-25 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 368 Reclosing relay shot counter = 2 (see Table 6.3) Reclosing relay shot counter = 3 (see Table 6.3) Reclosing relay shot counter = 4 (see Table 6.3) 9-26 Setting the Relay Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 369 Reset) serial port command is executed (see Figures 5.1 and 5.17) Circuit breaker status (asserts to logical 1 when Indication circuit breaker is closed; see Figure 6.1) Not used Not used Date Code 20001006 Setting the Relay 9-27 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 370 BCWA A-phase breaker contact wear has reached 100% Indication wear level (see Breaker Monitor in Section 8: Breaker Monitor, Metering, and Load Profile Functions) 9-28 Setting the Relay Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 371 Output contact OUT4 asserted (see Figure 7.29) OUT103 Output contact OUT3 asserted (see Figure 7.29) OUT102 Output contact OUT2 asserted (see Figure 7.29) OUT101 Output contact OUT1 asserted (see Figure 7.29) Date Code 20001006 Setting the Relay 9-29 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 372 Note following Figure 5.2 and the Note in the Lockout State discussion, following Table 6.1) CC*** Asserts 1/4 cycle for Close Command execution (see the Note in the Set Close discussion, following Figure 6.1) 9-30 Setting the Relay Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 373 Output contact OUT208 asserted (see Figure 7.30) (43) OUT209 Output contact OUT209 asserted (see Figure 7.30) OUT210 Output contact OUT210 asserted (see Figure 7.30) OUT211 Output contact OUT211 asserted (see Figure 7.30) Date Code 20001006 Setting the Relay 9-31 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 374 Channel A, received bit 5 RMB4A Channel A, received bit 4 RMB3A Channel A, received bit 3 RMB2A Channel A, received bit 2 RMB1A Channel A, received bit 1 9-32 Setting the Relay Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 375 Channel B, transmit bit 5 TMB4B Channel B, transmit bit 4 TMB3B Channel B, transmit bit 3 TMB2B Channel B, transmit bit 2 TMB1B Channel B, transmit bit 1 Date Code 20001006 Setting the Relay 9-33 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 376 Level 4 A-phase power element PWRB4 Level 4 B-phase power element PWRC4 Level 4 C-phase power element INTA A-phase voltage interruption element Sag/Swell/Int INTB B-phase voltage interruption element reporting 9-34 Setting the Relay Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 377: Settings Explanations

    Identifier Labels Refer to Settings Sheet 1 of 23. The SEL-351 Relay has two identifier labels: the Relay Identifier (RID) and the Terminal Identi- fier (TID). The Relay Identifier is typically used to identify the relay or the type of protection scheme.

  • Page 378: Current Transformer Ratios

    15 miles, enter the line impedance values (W secondary) and then enter the corresponding line length: LL = 15.00 (miles) If this length of line is measured in kilometers rather than miles, then enter: LL = 24.14 (kilometers) 9-36 Setting the Relay Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 379: Delta-Connected Voltages

    Other System Parameters Refer to Settings Sheet 18 of 23. The global settings NFREQ and PHROT allow you to configure the SEL-351 Relay to your specific system. Set NFREQ equal to your nominal power system frequency, either 50 Hz or 60 Hz.
  • Page 380 Courtesy of NationalSwitchgear.com...
  • Page 381 ETTINGS HEET Page 1 of 24 SEL-351 R OR THE ELAY Date ELAY ETTINGS ERIAL OMMAND RONT ANEL Identifier Labels (See Settings Explanations in Section 9) Relay Identifier (30 characters) RID = Terminal Identifier (30 characters) TID = Current and Potential Transformer Ratios (See Settings Explanations in Section 9)
  • Page 382 ETTINGS HEET Page 2 of 24 SEL-351 R OR THE ELAY Date ELAY ETTINGS ERIAL OMMAND RONT ANEL Time-Overcurrent Enable Settings Phase elements (N, 1, 2) (see Table 3.1, Figures 3.14, 3.15, 3.16, and 3.17) E51P = Neutral ground elements - channel IN (Y, N) (see Figure 3.18) E51N= Residual ground elements (Y, N) (see Figure 3.19)
  • Page 383 ETTINGS HEET Page 3 of 24 SEL-351 R OR THE ELAY Date ELAY ETTINGS ERIAL OMMAND RONT ANEL Phase Definite-Time Overcurrent Elements (See Figure 3.3) (Number of phase element time delay settings dependent on preceding enable setting E50P = 1 - 6; all four time delay settings are enabled if E50P ³4)
  • Page 384 ETTINGS HEET Page 4 of 24 SEL-351 R OR THE ELAY Date ELAY ETTINGS ERIAL OMMAND RONT ANEL Residual Ground Inst./Def.-Time Overcurrent Elements (See Figures 3.10 and 3.11) (Number of residual ground element pickup settings dependent on preceding enable setting E50G = 1 - 6) Pickup (OFF, 0.25 - 100.00 A {5 A nom.}, 0.05 - 20.00 A {1 A nom.})
  • Page 385 ETTINGS HEET Page 5 of 24 SEL-351 R OR THE ELAY Date ELAY ETTINGS ERIAL OMMAND RONT ANEL Phase Time-Overcurrent Element (See Figure 3.14) (Make the following settings if preceding enable setting E51P = 1 or 2) Pickup (OFF, 0.50 - 16.00 A {5 A nom.}, 0.10 - 3.20 A {1 A nom.}) 51PP = Curve (U1 - U5, C1 - C5;...
  • Page 386 ETTINGS HEET Page 6 of 24 SEL-351 R OR THE ELAY Date ELAY ETTINGS ERIAL OMMAND RONT ANEL Residual Ground Time-Overcurrent Element (See Figure 3.19) (Make the following settings if preceding enable setting E51G = Y) Pickup (OFF, 0.50 - 16.00 A {5 A nom.}, 0.10 - 3.20 A {1 A nom.}) 51GP = Curve (U1 - U5, C1 - C5;...
  • Page 387 ETTINGS HEET Page 7 of 24 SEL-351 R OR THE ELAY Date ELAY ETTINGS ERIAL OMMAND RONT ANEL (If channel IN is rated 0.05 A nominal, then setting option “I” is not available for setting ORDER. If the voltage inputs are delta-connected, then setting option “V” is not available for setting ORDER.)
  • Page 388 ETTINGS HEET Page 8 of 24 SEL-351 R OR THE ELAY Date ELAY ETTINGS ERIAL OMMAND RONT ANEL Voltage Elements (See Figures 3.21, 3.22, 3.23, 3.24, and 3.25) (Make the following settings if preceding enable setting EVOLT = Y and the voltage inputs are wye-...
  • Page 389 ETTINGS HEET Page 9 of 24 SEL-351 R OR THE ELAY Date ELAY ETTINGS ERIAL OMMAND RONT ANEL (Make the following settings if preceding enable setting EVOLT = Y and the voltage inputs are delta- connected) Phase-to-phase undervoltage pickup (OFF, 0.0 - 260.0 V secondary) 27PP1P = Phase-to-phase undervoltage pickup (OFF, 0.0 - 260.0 V secondary)
  • Page 390 ETTINGS HEET Page 10 of 24 SEL-351 R OR THE ELAY Date ELAY ETTINGS ERIAL OMMAND RONT ANEL Level 2 pickup (OFF, 40.10 - 65.00 Hz) 81D2P = Level 2 time delay (2.00 - 16000.00 cycles in 0.25-cycle steps) 81D2D = Level 3 pickup (OFF, 40.10 - 65.00 Hz)
  • Page 391 ETTINGS HEET Page 11 of 24 SEL-351 R OR THE ELAY Date ELAY ETTINGS ERIAL OMMAND RONT ANEL DCUB disabling time delay (0.25 - 16000.00 cycles in 0.25-cycle steps) UBDURD = DCUB duration time delay (0.00 - 16000.00 cycles in 0.25-cycle steps) UBEND = DCB Trip Scheme Settings (See Figure 5.14)
  • Page 392 ETTINGS HEET Page 12 of 24 SEL-351 R OR THE ELAY Date ELAY ETTINGS ERIAL OMMAND RONT ANEL Control Equation Variable Timers (See Figures 7.25 and 7.26) OGIC (Number of timer pickup/dropout settings dependent on preceding enable setting ESV = 1 - 16) SV1 Pickup Time (0.00-999999.00 cycles in 0.25-cycle steps)
  • Page 393 ETTINGS HEET Page 13 of 24 SEL-351 R OR THE ELAY Date ELAY ETTINGS ERIAL OMMAND RONT ANEL Power Elements (Available in Firmware Versions 2 and 4; see Figure 3.34) (Number of power element settings dependent on preceding enable setting EPWR = 1 - 4)
  • Page 394 ETTINGS HEET Page 14 of 24 SEL-351 R OR THE ELAY Date SET L) OGIC ONTROL QUATION ETTINGS ERIAL OMMAND Control Equation settings consist of Relay Word bits (see Table 9.3) and SEL OGIC OGIC Control Equation operators * (AND), + (OR), ! (NOT), / (rising edge), \ (falling edge), and ( ) (parentheses).
  • Page 395 ETTINGS HEET Page 15 of 24 SEL-351 R OR THE ELAY Date SET L) OGIC ONTROL QUATION ETTINGS ERIAL OMMAND Latch Bits Set/Reset Equations (See Figure 7.13) Set Latch Bit LT1 SET1 = Reset Latch Bit LT1 RST1 = Set Latch Bit LT2...
  • Page 396 ETTINGS HEET Page 16 of 24 SEL-351 R OR THE ELAY Date SET L) OGIC ONTROL QUATION ETTINGS ERIAL OMMAND Torque Control Equations for Time-Overcurrent Elements [Note: torque control equation settings cannot be set directly to logical 0] A-phase (see Figure 3.15) 51ATC = B-phase (see Figure 3.16)
  • Page 397 ETTINGS HEET Page 17 of 24 SEL-351 R OR THE ELAY Date SET L) OGIC ONTROL QUATION ETTINGS ERIAL OMMAND Output Contact OUT10 OUT10 = Output Contact OUT11 OUT11 = Output Contact Equations for Models 0351x0, 0351x1, and 0351xY (See Figure 7.29)
  • Page 398 ETTINGS HEET Page 18 of 24 SEL-351 R OR THE ELAY Date SET L) OGIC ONTROL QUATION ETTINGS ERIAL OMMAND Setting Group Selection Equations (See Table 7.4) Select Setting Group 1 SS1 = Select Setting Group 2 SS2 = Select Setting Group 3...
  • Page 399 ETTINGS HEET Page 19 of 24 SEL-351 R OR THE ELAY Date SET G LOBAL ETTINGS ERIAL OMMAND RONT ANEL Settings Group Change Delay (See Multiple Setting Groups in Section 7) Group change delay (0.00 - 16000.00 cycles in 0.25-cycle steps)
  • Page 400 ETTINGS HEET Page 20 of 24 SEL-351 R OR THE ELAY Date SET G LOBAL ETTINGS ERIAL OMMAND RONT ANEL Optoisolated Input Timers for Models 0351x1 and 0351xY - Extra I/O Board (See Figure 7.3) Input IN201 debounce time (0.00 - 1.00 cycles in 0.25-cycle steps) IN201D = Input IN202 debounce time (0.00 - 1.00 cycles in 0.25-cycle steps)
  • Page 401 ETTINGS HEET Page 21 of 24 SEL-351 R OR THE ELAY Date SET R) EQUENTIAL VENTS ECORDER AND ROFILE ETTINGS ERIAL OMMAND Sequential Events Recorder settings are comprised of three trigger lists. Each trigger list can include up to 24 Relay Word bits delimited by spaces or commas. Enter NA to remove a list of these Relay Word bit settings.
  • Page 402 ETTINGS HEET Page 22 of 24 SEL-351 R OR THE ELAY Date SET T) ABEL ETTINGS ERIAL OMMAND Enter the following characters: 0-9, A-Z, -, /, ., space for each text label setting, subject to the specified character limit. Enter NA to null a label.
  • Page 403 ETTINGS HEET Page 23 of 24 SEL-351 R OR THE ELAY Date SET T) ABEL ETTINGS ERIAL OMMAND Local Bit LB8 Name (14 characters) NLB8 = Clear Local Bit LB8 Label (7 characters) CLB8 = Set Local Bit LB8 Label (7 characters)
  • Page 404 PROTO = MBA or MBB. See Appendix I. Set FASTOP = Y to enable binary Fast Operate messages at the serial port. Set FASTOP = N to block binary Fast Operate messages. Refer to Appendix D for the description of the SEL-351 Relay Fast Operate commands.
  • Page 405 Port Connector and Communications Cables................10-2 IRIG-B ........................... 10-2 SEL-351 to Computer..................... 10-4 SEL-351 to Modem ......................10-4 SEL-351 to SEL-PRTU....................10-5 SEL-351 to SEL-2020, SEL-2030, or SEL-2100 ............10-5 SEL-351 to SEL-DTA2 ....................10-5 Communications Protocol....................... 10-6 Hardware Protocol......................10-6 Software Protocols......................10-6 SEL ASCII Protocol....................
  • Page 406 Table 10.4: Serial Communications Port Pin/Terminal Function Definitions........10-6 Table 10.5: Serial Port Automatic Messages ..................10-9 Table 10.6: Serial Port Command Summary..................10-12 Table 10.7: SEL-351 Relay Word and Its Correspondence to TAR Command ......... 10-31 Table 10.8: SEL-351 Relay Control Subcommands ................. 10-36 FIGURES Figure 10.1: DB-9 Connector Pinout for EIA-232 Serial Ports ............

  • Page 407: Section 10: Serial Port Communications And Commands

    0351xJ 0351xY * Initial releases of the SEL-351 Relay Model 0351xM label the front-panel serial port as Serial Port 3, instead of Serial Port F. Connect the serial port to a computer serial port for local communications or to a modem for remote communications.

  • Page 408: Port Connector And Communications Cables

    Refer to the Reference Figures in preceding Table 10.1 and the following Table 10.2. Note that demodulated IRIG-B time code can be input into Serial Port 2 on any of the SEL-351 Relay models. This is handled adeptly by connecting Serial Port 2 of the SEL-351 Relay to an SEL-2020 with Cable C273A (see cable diagrams that follow in this section).
  • Page 409 +IRIG-B -IRIG-B The following cable diagrams show several types of EIA-232 serial communications cables that connect the SEL-351 Relay to other devices. These and other cables are available from SEL. Contact the factory for more information. Date Code 20001006 Serial Port Communications and Commands...

  • Page 410: Sel-351 To Computer

    SEL-351 to Computer Cable C234A SEL-351 Relay 9-Pin *DTE Device 9-Pin Male 9-Pin Female “D” Subconnector “D” Subconnector RXD 2 3 TXD TXD 3 2 RXD GND 5 5 GND CTS 8 8 CTS 7 RTS 1 DCD 4 DTR...

  • Page 411: Sel-351 To Sel-Prtu

    2 RXD RXD 4 3 TXD CTS 5 7 RTS +12 7 8 CTS GND 9 9 GND SEL-351 to SEL-2020, SEL-2030, or SEL-2100 Cable C273A SEL-2020 SEL-351 Relay 9-Pin Male 9-Pin Male “D” Subconnector “D” Subconnector RXD 2 3 TXD...

  • Page 412: Communications Protocol

    If RTSCTS = Y, the relay does not send characters until the CTS input is asserted. Software Protocols The SEL-351 Relay provides standard SEL protocols: SEL ASCII, SEL Distributed Port Switch Protocol (LMD), SEL Fast Meter, and SEL Compressed ASCII. In addition, the relay provides ™...

  • Page 413: Sel Ascii Protocol

    The Sel-351 Relay is compatible with the SEL-DTA2 Display/Transducer Adapter. See Settings Sheet 24 in Section 9: Setting the Relay. To select SEL ASCII protocol, set the port PROTO setting to SEL. To select SEL Distributed Port Switch Protocol (LMD), set PROTO = LMD.

  • Page 414: Sel Distributed Port Switch Protocol (Lmd)

    The relay provides Distributed Network Protocol (DNP) V3.00 slave support. DNP is an optional protocol and is described in Appendix H. Communications IRRORED The SEL-351 Relay supports M relay-to-relay communications on two ports IRRORED simultaneously (available in firmware versions 1, 2, 3, and 4 only). See Appendix I.

  • Page 415: Serial Port Access Levels

    When the serial port AUTO setting is DTA, the SEL-351 is compatible with the SEL-DTA2 on that port. The MET and MET D command responses are modified to comply with the DTA2 data format for that port. Table 10.5: Serial Port Automatic Messages...

  • Page 416: Access Level 1

    Commands (Go to Access Level 1, B, or 2) in the Command Explanations subsection for more detail]. Enter the 2AC command at the Access Level B prompt: ==>2AC <ENTER> 10-10 Serial Port Communications and Commands Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 417: Access Level 2

    Again, a higher access level can access the serial port commands in a lower access level. The commands are shown in upper-case letters, but they can also be entered with lower-case letters. Date Code 20001006 Serial Port Communications and Commands 10-11 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 418 The relay responds with “Invalid Access Level” if a command is entered from an access level lower than the specified access level for the command. The relay responds: Invalid Command to commands not listed above or entered incorrectly. 10-12 Serial Port Communications and Commands Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 419: Command Explanations

    = ON). Refer to Tables 2.6 and 2.7 for Password jumper information. See PAS Command explanation later in this section for more information on passwords. Date Code 20001006 Serial Port Communications and Commands 10-13 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 420: Access Level Attempt (Password Required)

    ALARM contact for one second and remains at Access Level 0 (“=” prompt). Access Level Attempt (Password Not Required) Assume the following conditions: Password jumper = ON (in place), Access Level = 0. 10-14 Serial Port Communications and Commands Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 421: Access Level 1 Commands

    See the BRE n command in Access Level B Commands that follows in this section and Breaker Monitor in Section 8: Breaker Monitor, Metering, and Load Profile Functions for further details on the breaker monitor. Date Code 20001006 Serial Port Communications and Commands 10-15 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 422: Comm Command (Communication Data - Available In Firmware Versions 1, 2, 3, And 4)

    10 through 20 of the COMM records for display in the report, type COMM 10 20 L <ENTER>. To reverse the order of the COMM records in the report, supply a range of row 10-16 Serial Port Communications and Commands Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 423: Dat Command (View/Change Date)

    Access Level B Commands that follows in this section and Multiple Setting Groups in Section 7: Inputs, Outputs, Timers, and Other Control Logic for further details on settings groups. Date Code 20001006 Serial Port Communications and Commands 10-17 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 424: His Command (Event Summaries/History)

    (assertion of TRIP Relay Word bit) or other programmable event ® report trigger condition (SEL Control Equation setting ER). OGIC 10-18 Serial Port Communications and Commands Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 425: Iri Command (Synchronize To Irig-B Time Code)

    If the relay successfully synchronizes to IRIG, it sends the following header and access level prompt: FEEDER 1 Date: 03/05/97 Time: 10:15:09.609 STATION A => Date Code 20001006 Serial Port Communications and Commands 10-19 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 426: Ldp Command (Load Profile Report - Available In Firmware Versions 1, 2, 3 And 4)

    Instantaneous, Demand, Energy, and Maximum/Minimum. Note: If the serial port AUTO setting is DTA, the SEL-351 Relay response for MET and MET D will be formatted differently on that serial port than shown below.

  • Page 427: Met D - Demand Metering

    (1 - 32767) to repeat the meter display. If k is not specified, the meter report is displayed once. The output from an SEL-351 Relay with wye-connected voltage inputs is shown: =>MET <ENTER>...

  • Page 428: Met E - Energy Metering

    The output from an SEL-351 Relay with wye-connected voltage inputs is shown: =>MET D <ENTER> MET D <ENTER> FEEDER 1 Date: 02/01/97 Time: 15:08:05.615 STATION A DEMAND 188.6 186.6 191.8 PEAK 188.6 186.6 191.8 MW3P MVARA MVARB MVARC MVAR3P DEMAND IN...

  • Page 429: Met M - Maximum/Minimum Metering

    Reset Time Last time the maximum/minimum meter was reset To view maximum/minimum metering values, enter the command: =>MET M <ENTER> The output from an SEL-351 Relay with wye-connected voltage inputs is shown: =>MET M <ENTER> MET M <ENTER> FEEDER 1 Date: 02/01/97 Time: 15:16:00.239...

  • Page 430: Qui Command (Quit Access Level)

    You may append a setting name to each of the commands to specify the first setting to display (e.g., SHO 1 E50P displays the setting Group 1 relay settings starting with setting E50P). The default is the first setting. 10-24 Serial Port Communications and Commands Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 431 Below are sample SHOWSET commands for the SEL-351 Relay model 0351xT (wye-connected voltages), showing all the factory default settings (firmware version 0; see Table 1.2). The factory default settings for the SEL-351 Relay models 0351x0, 0351x1, and 0351xY are similar. =>SHO <ENTER>...
  • Page 432 51GTC =1 51QTC =1 =TRIP SV10 =0 SV11 =0 SV12 =0 SV13 =0 SV14 =0 SV15 =0 SV16 =0 Press RETURN to continue <ENTER> <ENTER> 10-26 Serial Port Communications and Commands Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 433 Port F PROTO = SEL SPEED = 2400 BITS = 8 PARITY= N STOP = 1 T_OUT = 15 AUTO = N RTSCTS= N FASTOP= N Date Code 20001006 Serial Port Communications and Commands 10-27 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 434: Ssi Command (Voltage Sag/Swell/Interruption Report - Available In Firmware Versions 3 And 4)

    (1 - 32767) to repeat the status display. If n is not specified, the status report is displayed once. The output of an SEL-351 Relay with wye-connected voltage inputs and no extra I/O board is shown in the following screen capture.

  • Page 435: Sta Command Row And Column Definitions

    To reset the self-test statuses, use the STA C command from Access Level 2: =>>STA C <ENTER> The relay responds: Reboot the relay and clear status Are you sure (Y/N) ? Date Code 20001006 Serial Port Communications and Commands 10-29 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 436: Tar Command (Display Relay Element Status)

    (1 - 32767) to repeat the Relay Word row display. If k is not specified, the Relay Word row is displayed once. 10-30 Serial Port Communications and Commands Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 437: Tim Command (View/Change Time)

    (see Figure 5.1). Shows Relay Word Row 0. Note: The TAR R Command cannot reset the latched targets if a TRIP condition is present. Table 10.7: SEL-351 Relay Word and Its Correspondence to TAR Command TAR 0 TRIP INST...

  • Page 438: Tri Command (Trigger Event Report)

    40.8 IC= 40.8 kA Ext Trips= 0.8 IB= 0.9 IC= 1.1 kA Percent wear: A= 25 B= 28 C= 24 LAST RESET 01/27/97 15:32:59 ==> 10-32 Serial Port Communications and Commands Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 439: Clo Command (Close Breaker)

    If the Breaker jumper is not in place (Breaker jumper = OFF), the relay does not execute the CLO command and responds: Aborted: No Breaker Jumper Date Code 20001006 Serial Port Communications and Commands 10-33 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 440: Gro N Command (Change Active Setting Group)

    See the Note following Figure 5.2 and the Note in the Lockout State discussion, following Table 6.1, for more information concerning Relay Word bit OC and its recommended use, as used in the factory settings. 10-34 Serial Port Communications and Commands Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 441: Pul Command (Pulse Output Contact)

    The relay generates an event report if any of the OUT1 through OUT11 (Model 0351xT) or OUT101 through OUT107 (Models 0351x0, 0351x1, or 0351xY) contacts are pulsed. The PULSE command is primarily used for testing purposes. Date Code 20001006 Serial Port Communications and Commands 10-35 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 442: Access Level 2 Commands

    PRB 5 <ENTER> =>> You must enter the same remote bit number in both steps in the command. If the bit numbers do not match, the relay responds “Invalid Command.” Table 10.8: SEL-351 Relay Control Subcommands Subcommand Description SRB n Set Remote Bit n (“ON”...

  • Page 443: Loo Command (Loop Back - Available In Firmware Versions 1, 2, 3, And 4)

    PAS Command (View/Change Passwords) PAS allows you to inspect or change existing passwords. To inspect passwords, type: =>>PAS <ENTER> PAS <ENTER> 1:OTTER B:EDITH 2:TAIL =>> Date Code 20001006 Serial Port Communications and Commands 10-37 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 444: Set Command (Change Settings)

    Section 9: Setting the Relay. VER Command (Show Relay Configuration and Firmware Version) The VER command provides relay configuration information such as nominal current input ratings. An example printout of the VER command for an SEL-351 Relay follows: =>>VER <ENTER> VER <ENTER>...

  • Page 445: Sel-351 Relay Command Summary

    SEL-351 RELAY COMMAND SUMMARY Access Level 0 Access Level 0 is the initial relay access level. The relay automatically returns Command to Access Level 0 when a serial port time-out setting expires or after a QUIT command. The screen prompt is: = Enter Access Level 1.
  • Page 446 Show all rows in SSI report recorded on the specified date (see DAT command for date format). d1 d2 Show all rows in SSI report recorded between dates d1 and d2, inclusive. Clears SSI report from nonvolatile memory. Command Summary Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 447 Change Access Level B password to xxxxxx. PAS 2 xxxxxx Change Access Level 2 password to xxxxxx. Entering DISABLE as the password disables the password requirement for the specified access level. Date Code 20001006 Command Summary SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 448 Exits setting editing session, then prompts user to save settings. Ctrl - X Aborts setting editing session without saving changes. Available in firmware versions 1, 2, 3, and 4. Available in firmware versions 3 and 4. Command Summary Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 449 Figure 11.1: SEL-351 Relay Front-Panel Pushbuttons – Overview............11-1 Figure 11.2: SEL-351 Relay Front-Panel Pushbuttons – Primary Functions......... 11-2 Figure 11.3: SEL-351 Relay Front-Panel Pushbuttons – Primary Functions (continued) ..... 11-3 Figure 11.4: SEL-351 Relay Front-Panel Pushbuttons – Secondary Functions........11-4 Figure 11.5: Local Control Switch Configured as an ON/OFF Switch ..........
  • Page 450 Courtesy of NationalSwitchgear.com...

  • Page 451: Section 11: Front-Panel Interface

    (see global setting FP_TO in Settings Sheet 16 of 21 at the end of Section 9: Setting the Relay; relay shipped with FP_TO = 15 minutes). Figure 11.1: SEL-351 Relay Front-Panel Pushbuttons – Overview Primary Functions Note in Figure 11.2 and Figure 11.3 that the front-panel pushbutton primary functions correspond...

  • Page 452: Front-Panel Password Security

    Some of the front-panel primary functions do not have serial port command equivalents. These are discussed in the following Functions Unique to the Front-Panel Interface. Figure 11.2: SEL-351 Relay Front-Panel Pushbuttons – Primary Functions Front-Panel Password Security Refer to the comments at the bottom of Figure 11.3 concerning Access Level B and Access Level 2 passwords.

  • Page 453: Secondary Functions

    Figure 11.3: SEL-351 Relay Front-Panel Pushbuttons – Primary Functions (continued) Secondary Functions After a primary function is selected (see Figure 11.2 and Figure 11.3), the pushbuttons then revert to operating on their secondary functions (see Figure 11.4). Use the left/right arrows to underscore a desired function. Then press the SELECT pushbutton to select the function.
  • Page 454 Press the CANCEL pushbutton to abort a setting change procedure and return to the previous display. Press the EXIT pushbutton to return to the default display and have the primary pushbutton functions activated again (see Figure 11.2 and Figure 11.3). Figure 11.4: SEL-351 Relay Front-Panel Pushbuttons – Secondary Functions 11-4 Front-Panel Interface...

  • Page 455: Functions Unique To The Front-Panel Interface

    RECLOSE COUNT = 0. If the breaker is open and the reclosing relay is locked out after a reclose sequence (LO LED on front panel is illuminated), RECLOSE COUNT = 2. Date Code 20001006 Front-Panel Interface 11-5 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 456: Reclosing Relay Shot Counter Screen Operation (With Factory Settings)

    (front-panel LO LED extinguishes and RS LED illuminates), and the shot counter returns to 0. The reclosing relay shot counter screen appears as: SET RECLOSURES=2 RECLOSE COUNT =0 11-6 Front-Panel Interface Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 457: Local Control

    Section 10: Serial Port Communications and Commands]. See Local Control Switches in Section 7: Inputs, Outputs, Timers, and Other Control Logic for more information on local control. Date Code 20001006 Front-Panel Interface 11-7 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 458: View Local Control (With Factory Settings)

    “output contact testing” function: Output Contact ←→ Testing This front-panel function provides the same function as the serial port PUL command (see Figure 11.3). 11-8 Front-Panel Interface Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 459: Operate Local Control (With Factory Settings)

    On the display, the MANUAL TRIP switch is shown to be in the TRIP position for 2 seconds (long enough to be seen), and then it returns to the RETURN position: MANUAL TRIP ←→ Position: RETURN Date Code 20001006 Front-Panel Interface 11-9 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 460: Local Control State Retained When Relay Deenergized

    If local bit LB1 is substituted for input IN2 to provide the reclose enable/disable function, the SEL Control Equation drive-to-lockout setting is set as follows: OGIC 79DTL = OC + !LB1 + LB3 [=NOT(LB1) + LB3] 11-10 Front-Panel Interface Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 461: Rotating Default Display

    The display is on a 2-second rotation for each screen. The display point factory settings are: DP1 = IN2 (optoisolated input IN2) DP2 = 52A (Relay Word bit 52A = IN1 in factory settings) Date Code 20001006 Front-Panel Interface 11-11 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 462 DP1_1 = 79 ENABLED DP1 = IN2 = logical 1 DP1_0 = 79 DISABLED DP2_1 = BREAKER CLOSED DP2 = 52A = logical 0 DP2_0 = BREAKER OPEN 11-12 Front-Panel Interface Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 463 Settings) in Section 10: Serial Port Communications and Commands]. For more detailed information on the logic behind the rotating default display, see Rotating Default Display in Section 7: Inputs, Outputs, Timers, and Other Control Logic. Date Code 20001006 Front-Panel Interface 11-13 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 464: Additional Rotating Default Display Example

    Additional Rotating Default Display Example See Figure 5.17 and accompanying text in Section 5: Trip and Target Logic for an example of resetting a rotating default display with the TARGET RESET pushbutton. 11-14 Front-Panel Interface Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 465 Table 12.3: Standard Event Report Current, Voltage, and Frequency Columns ........12-8 Table 12.4: Output, Input, and Protection and Control Element Event Report Columns ....... 12-9 Date Code 20001006 Standard Event Reports, Sag/Swell/Interruption Report, and SER SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 466 Figure 12.4: Derivation of Phasor RMS Current Values From Event Report Current Values ..... 12-33 Figure 12.5: Example Sequential Events Recorder (SER) Event Report ..........12-34 Figure 12.6: Example Sag/Swell/Interruption (SSI) Report............... 12-38 Standard Event Reports, Sag/Swell/Interruption Report, and SER Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 467: Section 12: Standard Event Reports, Sag/Swell/ Interruption Report, And Ser

    See Figure 12.2 for an example event report (Note: Figure 12.2 is on multiple pages). Event Report Length (Settings LER and PRE) The SEL-351 Relay provides user-programmable event report length and prefault length. Event report length is either 15 or 30 cycles. Prefault length ranges from 1 to 29 cycles. Prefault length is the first part of the event report that precedes the event report triggering point.

  • Page 468: Standard Event Report Triggering

    When setting ER sees a logical 0 to logical 1 transition, it generates an event report (if the SEL-351 Relay is not already generating a report that encompasses the new transition). The factory setting is:...

  • Page 469: Tri (Trigger Event Report) And Pul (Pulse Output Contact) Commands

    See Section 10: Serial Port Communications and Commands and Section 11: Front-Panel Interface (Figure 11.3) for more information on the TRI (Trigger Event Report) and PUL (Pulse Output Contact) commands. Date Code 20001006 Standard Event Reports, Sag/Swell/Interruption Report, and SER 12-3 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 470: Standard Event Report Summary

    The “Event:” field shows the event type. The possible event types and their descriptions are shown in the table below. Note the correspondence to the preceding event report triggering conditions (see Standard Event Report Triggering in this section). 12-4 Standard Event Reports, Sag/Swell/Interruption Report, and SER Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 471: Fault Location

    Calculated residual ((I = 3I ; calculated from channels IA, IB, and IC) Negative-sequence (Q = 3I ; calculated from channels IA, IB, and IC) Date Code 20001006 Standard Event Reports, Sag/Swell/Interruption Report, and SER 12-5 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 472: Retrieving Full-Length Standard Event Reports

    Display the report in Compressed ASCII format. Specifies only the Communication element section of the event is displayed. Below are example EVE commands. 12-6 Standard Event Reports, Sag/Swell/Interruption Report, and SER Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 473: Compressed Ascii Event Reports

    “Invalid Event” Compressed ASCII Event Reports The SEL-351 Relay provides compressed ASCII event reports to facilitate event report storage and display. The SEL-2020 Communications Processor and the SEL-5601 Analytic Assistant software take advantage of the compressed ASCII format. Use the EVE C command or CEVENT command to display compressed ASCII event reports.

  • Page 474: Clearing Standard Event Report Buffer

    Voltage measured by channel VS (primary kV) Voltage measured at power input terminals Z15 and Z16 (Vdc) Freq Frequency of channel VA (Hz) 12-8 Standard Event Reports, Sag/Swell/Interruption Report, and SER Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 475: Output, Input, And Protection And Control Columns

    OUT105, OUT106 Output contact OUT6 (or OUT106) (Models 0351x0, asserted. 0351x1, and 0351xY) Both OUT5 and OUT6 (or OUT105 and OUT106) asserted. Date Code 20001006 Standard Event Reports, Sag/Swell/Interruption Report, and SER 12-9 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 476 Both IN5 and IN6 (or IN105 and IN106) asserted. In 78 IN7, IN8 Optoisolated input IN7 asserted.. (Model 0351xT) Optoisolated input IN8 asserted. Both IN7 and IN8 asserted. 12-10 Standard Event Reports, Sag/Swell/Interruption Report, and SER Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 477 Reverse phase directional element R32P picked up. F32Q Forward negative-sequence directional element F32Q picked up. R32Q Reverse negative-sequence directional element R32Q picked up. Date Code 20001006 Standard Event Reports, Sag/Swell/Interruption Report, and SER 12-11 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 478 27A_ and 27B_ elements picked up. 27B_ and 27C_ elements picked up. 27C_ and 27A_ elements picked up. 27A_, 27B_ and 27C_ elements picked 12-12 Standard Event Reports, Sag/Swell/Interruption Report, and SER Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 479 27BC2 and 27CA2 elements picked up. 27AB2, 27BC2 and 27CA2 elements picked up. 27 S Channel VS instantaneous undervoltage element 27S picked up. Date Code 20001006 Standard Event Reports, Sag/Swell/Interruption Report, and SER 12-13 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 480 59AB1 and 59CA1 elements picked up. 59AB1 and 59BC1 elements picked up. 59BC1 and 59CA1 elements picked up. 59AB, 59BC1 and 59CA1 elements picked up. 12-14 Standard Event Reports, Sag/Swell/Interruption Report, and SER Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 481 59VS picked up (used in synchronism check). Both 59VP and 59VS picked up. 25 SF Slip frequency element SF picked up (used in synchronism check). Date Code 20001006 Standard Event Reports, Sag/Swell/Interruption Report, and SER 12-15 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 482 = 3 (SH3). shot = 4 (SH4). ZLIN, ZLOUT Load encroachment “load in” element ZLIN picked up. Load encroachment “load out” element ZLOUT picked up. 12-16 Standard Event Reports, Sag/Swell/Interruption Report, and SER Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 483 OPE (Open) command executed. CLO (Close) command executed. Ltch 12 LT1, LT2 Latch bit LT1 asserted. Latch bit LT2 asserted. Both LT1 and LT2 asserted. Date Code 20001006 Standard Event Reports, Sag/Swell/Interruption Report, and SER 12-17 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 484 Permissive trip 2 signal from DCUB logic PTRX2 asserted. both PTRX1 and PTRX2 asserted Z3RB Z3RB Zone (level) 3 reverse block Z3RB asserted. 12-18 Standard Event Reports, Sag/Swell/Interruption Report, and SER Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 485 TMB5A, TMB6A channel A transmit bit IRRORED 5 TMB5A asserted. channel A transmit bit IRRORED 6 TMB6A asserted. both TMB5A and TMB6A asserted. Date Code 20001006 Standard Event Reports, Sag/Swell/Interruption Report, and SER 12-19 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 486 TMB3B, TMB4B channel B transmit bit 3 IRRORED TMB3B asserted. channel B transmit bit 4 IRRORED TMB4B asserted. both TMB3B and TMB4B asserted. 12-20 Standard Event Reports, Sag/Swell/Interruption Report, and SER Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 487 RMB7B and RMB8B asserted. ROKA, ROKB channel A receive ok IRRORED ROKA asserted. channel B receive ok IRRORED ROKB asserted. both ROKA and ROKB asserted. Date Code 20001006 Standard Event Reports, Sag/Swell/Interruption Report, and SER 12-21 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 488 PWRB3, PWRB4 Level 3 B-phase power element PWR3B picked up. Level 4 B-phase power element PWR4B picked up. both PWR3B and PWR4B picked up. 12-22 Standard Event Reports, Sag/Swell/Interruption Report, and SER Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 489: Sequential Events Recorder (Ser) Report

    The other two SER factory settings (SER2 and SER3) trigger rows in the SER event report for such things as optoisolated input (IN1), output contact (OUT1, OUT2, or OUT3), and lockout state (79LO). Date Code 20001006 Standard Event Reports, Sag/Swell/Interruption Report, and SER 12-23 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 490: Making Ser Trigger Settings

    17 rows are displayed, if they exist. They display with the oldest row (row 17) at the beginning (top) of the report and the latest row (row 12-24 Standard Event Reports, Sag/Swell/Interruption Report, and SER Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 491 (Month/Day/Year). If setting DATE_F = YMD, then the dates are entered Year/Month/Day. If the requested SER event report rows do not exist, the relay responds: No SER Data Date Code 20001006 Standard Event Reports, Sag/Swell/Interruption Report, and SER 12-25 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 492: Clearing Ser Report

    0.0 122 59.70 1..b... 1385 -1 1520 -4.5 10.4 -4.6 -0.0 121 60.00 1..b... -2371 -1 -2218 -5.7 -4.0 10.2 0.0 120 60.00 1..b... 12-26 Standard Event Reports, Sag/Swell/Interruption Report, and SER Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 493 ...p.p.A. .. 1....Cr0 ....p....p.p.A. .. 1....Cr0 ....p....p.p.A. .. 1....Cr0 ....p....Date Code 20001006 Standard Event Reports, Sag/Swell/Interruption Report, and SER 12-27 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 494 Event: AG T Location: 2.41 Shot: 0 Frequency: 60.00 Targets: INST 50 see Figure 12.1 Currents (A Pri), ABCNGQ: 2749 0 2690 2688 12-28 Standard Event Reports, Sag/Swell/Interruption Report, and SER Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 495 SET2 =0 RST2 =0 SET3 =0 RST3 =0 SET4 =0 RST4 =0 SET5 =0 RST5 =0 SET6 =0 RST6 =0 SET7 =0 RST7 =0 Date Code 20001006 Standard Event Reports, Sag/Swell/Interruption Report, and SER 12-29 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 496 OUT1 =TRIP OUT2 =CLOSE OUT3 =SV1T OUT4 =0 OUT5 =0 OUT6 =0 OUT7 =0 OUT8 =0 OUT9 =0 OUT10 =0 OUT11 =0 =IN2 =IN1 12-30 Standard Event Reports, Sag/Swell/Interruption Report, and SER Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 497 RMS values. Figure 12.4 shows how the event report current column data can be converted to phasor RMS values. Voltages are processed similarly. Date Code 20001006 Standard Event Reports, Sag/Swell/Interruption Report, and SER 12-31 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 498 In Figure 12.3, note that any two rows of current data from the event report in Figure 12.2, 1/4 cycle apart, can be used to calculate RMS current values. 12-32 Standard Event Reports, Sag/Swell/Interruption Report, and SER Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 499 The present sample (IA = 2380 A) is a real RMS current value that relates to the phasor RMS current value: 2749 A * cos(-30.0°) = 2380 A Date Code 20001006 Standard Event Reports, Sag/Swell/Interruption Report, and SER 12-33 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 500: Example Sequential Events Recorder (Ser) Report

    (LB4 operates as a manual close) OUT2 = CLOSE Local bit LB4 deasserts automatically the next 1/4 cycle – close signal is latched in by close logic. 12-34 Standard Event Reports, Sag/Swell/Interruption Report, and SER Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 501 Close output contact OUT2 asserts for first automatic reclose. Related settings: 79OI1 = 30.000 Time difference: 09:52:15.535 - 09:52:15.039 = 0.496 seconds (= 30 cycles) Date Code 20001006 Standard Event Reports, Sag/Swell/Interruption Report, and SER 12-35 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 502: Ssi Triggering And Recording

    5. If any SSI element remains asserted for 24 hours, archive one record. 6. If all SSI elements drop out, archive one record and reset recorder. 12-36 Standard Event Reports, Sag/Swell/Interruption Report, and SER Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 503: Retrieving Ssi Reports

    (date 3/23/97) at the end (bottom) of the report. Chronological progression through the report is down the page and in descending row number. Date Code 20001006 Standard Event Reports, Sag/Swell/Interruption Report, and SER 12-37 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 504: Clearing Ssi Report

    0 101 90 101 17.9 1 03/07/98 03:29:33.499 100 100 100 0 101 97 101 17.9 POST =>> Figure 12.6: Example Sag/Swell/Interruption (SSI) Report 12-38 Standard Event Reports, Sag/Swell/Interruption Report, and SER Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 505 Relay Does Not Respond to Commands From Device Connected to Serial Port ..13-9 Relay Does Not Respond to Faults................13-9 Relay Calibration........................13-9 Factory Assistance........................13-10 TABLES Table 13.1: Relay Self-Tests ......................... 13-6 Date Code 20001006 Testing and Troubleshooting SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 506 Courtesy of NationalSwitchgear.com...

  • Page 507: Section 13: Testing And Troubleshooting

    SECTION 13: TESTING AND TROUBLESHOOTING NTRODUCTION This section provides guidelines for determining and establishing test routines for the SEL-351 Relay. Included are discussions on testing philosophies, methods, and tools. Relay self-tests and troubleshooting procedures are shown at the end of the section.
  • Page 508 At SEL, we recommend that maintenance tests on SEL relays be limited under the guidelines provided above. The time saved may be spent analyzing event data and thoroughly testing those systems that require more attention. 13-2 Testing and Troubleshooting Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 509: Testing Methods And Tools

    Serial Port Communications and Commands. Low-Level Test Interface The SEL-351 Relay has a low-level test interface between the calibrated input module and the separately-calibrated processing module. You may test the relay in either of two ways: conventionally, by applying ac current signals to the relay inputs or by applying low magnitude ac voltage signals to the low-level test interface.

  • Page 510: Delta-Connected Voltages

    VB - VC; VC pin to GND pin reflects voltage VC - VA). Sensitive Earth Fault (SEF) Channel IN (0.05 A Nominal) For SEL-351 Relays with SEF channel IN, the following applies to the input module output (J1) in Figure 13.1: 50 mV AT NOMINAL CURRENT (0.05 A, channel IN)

  • Page 511: Testing Via Front-Panel Indicators

    The examples below show the settings necessary to route the phase time-overcurrent element 51PT to the output contacts and the SER. The 51PT element, like many in the SEL-351 Relay, is ® controlled by enable settings and/or torque control SEL Control Equations.

  • Page 512: Relay Self-Tests

    30 mV Latched +5 V PS Warning +4.80 V Pulsed Measures the +5 V power +5.20 V supply every 10 seconds. Failure +4.65 V Latched +5.40 V 13-6 Testing and Troubleshooting Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 513 10 seconds. EEPROM Failure checksum Latched Performs a checksum test on the nonvolatile copy of the relay settings every 10 seconds. Date Code 20001006 Testing and Troubleshooting 13-7 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 514: Relay Troubleshooting

    Limits Disabled Output Description The following self-tests are performed by dedicated circuitry in the microprocessor and the SEL-351 Relay main board. Failures in these tests shut down the microprocessor and are not shown in the STATUS report. Micro- Failure Latched...

  • Page 515: Troubleshooting Procedure

    4. Analog input cable between transformer secondary and main board loose or defective. 5. Failed relay self-test. ELAY ALIBRATION The SEL-351 Relay is factory-calibrated. If you suspect that the relay is out of calibration, please contact the factory. Date Code 20001006 Testing and Troubleshooting...

  • Page 516: Factory Assistance

    ACTORY SSISTANCE The employee-owners of Schweitzer Engineering Laboratories are dedicated to making electric power safer, more reliable, and more economical. We appreciate your interest in SEL products, and we are committed to making sure you are satisfied. If you have any questions, please contact us at:...
  • Page 517 A5CE Fast Operate Configuration Block .................D-9 A5E0 Fast Operate Remote Bit Control ................. D-10 A5E3 Fast Operate Breaker Control ................D-11 ID Message........................D-11 DNA Message ....................... D-12 BNA Message........................ D-13 Date Code 20001006 Appendices Table of Contents SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 518 APPENDIX E: COMPRESSED ASCII COMMANDS........E-1 Introduction..........................E-1 CASCII Command – General Format..................E-1 CASCII Command – SEL-351....................E-2 CSTATUS Command – SEL-351 .................... E-7 CHISTORY Command – SEL-351..................E-8 CEVENT Command – SEL-351 ....................E-9 APPENDIX F: SETTING NEGATIVE-SEQUENCE OVERCURRENT ELEMENTS....................
  • Page 519 Control Equation Operators (Listed in Processing Order) ........G-3 OGIC Table G.2: SEL Control Equation Settings Limitations for Different SEL-351 Relay Models..G-11 OGIC Table G.3: Processing Order of Relay Elements and Logic (Top to Bottom)........G-12 Table H.1: Data Access Methods ......................H-2 Table H.2: SEL-351 DNP Object Table ....................H-6...
  • Page 520 Figure G.1: Result of Rising Edge Operators on Individual Elements in Setting ER ......G-6 Figure G.2: Result of Falling Edge Operator on a Deasserting Underfrequency Element .......G-7 Appendices Table of Contents Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 521: Appendix A: Firmware Versions

    The firmware revision number is after the “R” and the release date is after the “D”. The single “x” after “SEL-351” is the firmware version number and will be a 1, 2, 3, or 4, depending on the firmware features ordered with the relay (if the firmware version is a zero [0], then the “x” field...

  • Page 522: Firmware Revision History Table

    IRMWARE EVISION ISTORY ABLE This manual covers SEL-351 Relays that contain firmware bearing the following part numbers and revision numbers (most recent firmware listed at top): Firmware Part/Revision No. Description of Firmware These firmware differ from previous versions as follows: −...
  • Page 523 These firmware differ from previous versions as follows: − Fixed scaling problems with the directional elements and fault locator associated with the SEL-351-2, -3, and -4 Relays that have 300 V PTs. − Added the MB8A and MB8B serial port protocol...
  • Page 524 Model SEL-0351x0/x1/xY; wye-connected voltages SEL-351D-R106-VM Model SEL-0351T; delta-connected voltages SEL-351D-R106-V0 Model SEL-0351x0/x1/xY; delta-connected voltages Firmware R109 for upgrades of old hardware: SEL-351-R109-VM Model SEL-0351xM; wye-connected voltages SEL-351-R109-V0 Model SEL-0351x0/x1/xJ; wye-connected voltages Firmware Versions Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 525 Model SEL-0351x0/x1/xJ; wye-connected voltages SEL-351D-R104-VM Model SEL-0351M; delta-connected voltages SEL-351D-R104-V0 Model SEL-0351x0/x1/xJ; delta-connected voltages Firmware R107 for upgrades of old hardware: SEL-351-R107-VM Model SEL-0351xM; wye-connected voltages SEL-351-R107-V0 Model SEL-0351x0/x1/xJ; wye-connected voltages Date Code 20001006 Firmware Versions SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 526 52A added to Row 34 in Tables 9.4 and 9.8. SEL-351-R105-VM Model SEL-0351xM; wye-connected voltages SEL-351-R105-V0 Model SEL-0351x0/x1/xJ; wye-connected voltages SEL-351D-R102-VM Model SEL-0351M; delta-connected voltages SEL-351D-R102-V0 Model SEL-0351x0/x1/xJ; delta-connected voltages Firmware Versions Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 527 Model SEL-035100; wye-connected voltages This firmware differs from previous versions as follows: − Added SEL-351 Relay Models 035100 and 035101 (see Table 1.1 and accompanying text). − Relay now goes to the Lockout State for OPEN Command execution [OPEN command now embedded in the drive-to-lockout logic;...
  • Page 528 Courtesy of NationalSwitchgear.com...

  • Page 529: Appendix B: Firmware Upgrade Instructions

    NSTRUCTIONS SEL may occasionally offer firmware upgrades to improve the performance of your relay. The SEL-351 Relay stores firmware in Flash memory; therefore, changing physical components is not necessary. A firmware loader program called SEL resides in the SEL-351 Relay. These...
  • Page 530 BOOT happens, connect to the relay at 2400 baud and type BAUD 38400 at the SEL BOOT prompt. The firmware receive can be started again at step 8.) Firmware Upgrade Instructions Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 531 If the relay does not display the level 0 “ = ” prompt, the Relay baud rate has changed back to the factory default of 2400 baud; go to self-test failure: CR_RAM, EEPROM, and IO_BRD, Step 12e. Date Code 20001006 Firmware Upgrade Instructions SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 532 15; otherwise, type PAR <ENTER> and type the number from the diskette label and press <ENTER>. If the relay re-initializes after saving the changes, go to Access Level 2. Firmware Upgrade Instructions Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 533 Issue the Trigger (TRI) and Event (EVE) commands. Verify that the current and voltage signals are correct in the event report. The relay is now ready for your commissioning procedure. Date Code 20001006 Firmware Upgrade Instructions SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 534 Courtesy of NationalSwitchgear.com...

  • Page 535: Appendix C: Sel Distributed Port Switch Protocol

    Note: You can use the front-panel SET pushbutton to change the port settings to return to SEL protocol. Date Code 20001006 SEL Distributed Port Switch Protocol SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 536 Courtesy of NationalSwitchgear.com...

  • Page 537: Appendix D: Configuration, Fast Meter, And Fast Operate Commands

    ASCII Firmware ID String and Terminal ID Setting (TID) ASCII Names of Relay Word bits ASCII Names of bits in the A5B9 Status Byte Date Code 20001006 Configuration, Fast Meter, and Fast Operate Commands SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 538: Message Definitions

    # of digital banks (note: this value will be 2E on Firmware Version 0 of the relay.) One calculation block 0004 Analog channel offset 0054 Time stamp offset 005C Digital offset Configuration, Fast Meter, and Fast Operate Commands Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 539 Power Calculations (00 for wye-connected, 01 for delta-connected voltages) FFFF No Deskew angle FFFF No Rs compensation (-1) FFFF No Xs compensation (-1) IA channel index IB channel index Date Code 20001006 Configuration, Fast Meter, and Fast Operate Commands SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 540 Scale factor type 0000 Scale factor offset in Fast Meter message 564300000000 Analog channel name (VC, or VCA for delta-connected voltages) Analog channel type Configuration, Fast Meter, and Fast Operate Commands Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 541: A5D1 Fast Meter Data Block

    VS, Freq and Vbatt in 4-byte IEEE FPS 8-bytes Time stamp 46-bytes 46 Digital banks: TAR0 - TAR45 1-byte Reserved checksum 1-byte checksum of all preceding bytes Date Code 20001006 Configuration, Fast Meter, and Fast Operate Commands SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 542 VS, Freq and Vbatt in 4-byte IEEE FPS 8-bytes Time stamp 54-bytes 54 Digital banks: TAR0 - TAR53 1-byte Reserved checksum 1-byte checksum of all preceding bytes Configuration, Fast Meter, and Fast Operate Commands Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 543: A5C2/A5C3 Demand/Peak Demand Fast Meter Configuration Messages

    Scale factor offset in Fast Meter message 50422B000000 Analog channel name (PB+) Analog channel type Scale factor type 0000 Scale factor offset in Fast Meter message Date Code 20001006 Configuration, Fast Meter, and Fast Operate Commands SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 544 51422D000000 Analog channel name (QB-) Analog channel type Scale factor type 0000 Scale factor offset in Fast Meter message 51432D000000 Analog channel name (QC-) Configuration, Fast Meter, and Fast Operate Commands Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 545: A5D2/A5D3 Demand/Peak Demand Fast Meter Message

    In response to the A5B9 request, the relay clears the Fast Meter (message A5D1) Status Byte. The SEL-351 Status Byte contains one active bit, STSET (bit 4). The bit is set on power up and on settings changes. If the STSET bit is set, the external device should request the A5C1, A5C2, and A5C3 messages.

  • Page 546: A5E0 Fast Operate Remote Bit Control

    Remote bit set and clear operations are latched by the relay. Remote bit pulse operations assert the remote bit for one processing interval (1/4 cycle). D-10 Configuration, Fast Meter, and Fast Operate Commands Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 547: A5E3 Fast Operate Breaker Control

    The relay performs the specified breaker operation if the following conditions are true: 1. Conditions 1-5 defined in the A5E0 message are true. 2. The breaker jumper (JMP2B) is in place on the SEL-351 Relay main board. ID Message In response to the ID command, the relay sends the firmware ID (FID), boot firmware ID (BFID), firmware checksum (CID), relay TID setting (DEVID), Modbus device code (DEVCODE) –...

  • Page 548: Dna Message

    "50A1","50B1","50C1","50A2","50B2","50C2","50A3","50B3","yyyy" "50C3","50A4","50B4","50C4","50AB1","50BC1","50CA1","50AB2","yyyy" "50BC2","50CA2","50AB3","50BC3","50CA3","50AB4","50BC4","50CA4","yyyy" "50A","50B","50C","51A","51AT","51AR","51B","51BT","yyyy" "51BR","51C","51CT","51CR","51P","51PT","51PR","51N","yyyy" "51NT","51NR","51G","51GT","51GR","51Q","51QT","51QR","yyyy" "50P1","50P2","50P3","50P4","50N1","50N2","50N3","50N4","yyyy" "67P1","67P2","67P3","67P4","67N1","67N2","67N3","67N4","yyyy" "67P1T","67P2T","67P3T","67P4T","67N1T","67N2T","67N3T","67N4T","yyyy" "50G1","50G2","50G3","50G4","50Q1","50Q2","50Q3","50Q4","yyyy" "67G1","67G2","67G3","67G4","67Q1","67Q2","67Q3","67Q4","yyyy" "67G1T","67G2T","67G3T","67G4T","67Q1T","67Q2T","67Q3T","67Q4T","yyyy" "50P5","50P6","50N5","50N6","50G5","50G6","50Q5","50Q6","yyyy" "50QF","50QR","50GF","50GR","32VE","32QGE","32IE","32QE","yyyy" "F32P","R32P","F32Q","R32Q","F32QG","R32QG","F32V","R32V","yyyy" "F32I","R32I","32PF","32PR","32QF","32QR","32GF","32GR","yyyy" "27A1","27B1","27C1","27A2","27B2","27C2","59A1","59B1","yyyy" "59C1","59A2","59B2","59C2","27AB","27BC","27CA","59AB","yyyy" "59BC","59CA","59N1","59N2","59Q","59V1","27S","59S1","yyyy" "59S2","59VP","59VS","SF","25A1","25A2","3P27","3P59","yyyy" "81D1","81D2","81D3","81D4","81D5","81D6","27B81","50L","yyyy" "81D1T","81D2T","81D3T","81D4T","81D5T","81D6T","VPOLV","LOP","yyyy" "IN8","IN7","IN6","IN5","IN4","IN3","IN2","IN1","yyyy" D-12 Configuration, Fast Meter, and Fast Operate Commands Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 549: Bna Message

    "yyyy" is the 4-byte ASCII representation of the checksum. "*" indicates an unused bit location. The BNA command is available from Access Level 1 and higher. Date Code 20001006 Configuration, Fast Meter, and Fast Operate Commands D-13 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 550 Courtesy of NationalSwitchgear.com...

  • Page 551: Appendix E: Compressed Ascii Commands

    APPENDIX E: COMPRESSED ASCII COMMANDS NTRODUCTION The SEL-351 Relay provides compressed ASCII versions of some of the relay’s ASCII commands. The compressed ASCII commands allow an external device to obtain data from the relay, in a format which directly imports into spreadsheet or database programs, and which can be validated with a checksum.

  • Page 552: Cascii Command - Sel-351

    <STX>"No Data Available","0668"<CR><ETX> CASCII C – SEL-351 OMMAND Display the SEL-351 Relay compressed ASCII configuration message by sending: CAS <CR> Relay model 0351xT, Firmware Version 0 (wye-connected voltages), sends: <STX> "CAS",5,"YYYY"<CR>...
  • Page 553 “Names of elements in the relay word Rows 2 - 45 separated by spaces” field. Relay model 0351xT, Firmware Versions 1 and greater (wye-connected voltages), sends: <STX> "CAS",5,"YYYY"<CR> "CST",1,"YYYY"<CR> "1H","FID","YYYY"<CR> "1D","45S","YYYY"<CR> Date Code 20001006 Compressed ASCII Commands SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 554 "FREQ","TRIG","Names of elements in the relay word rows 2 - 49 separated by spaces","YYYY"<CR> "240D","I","I","I","I","I","F","F","F","F","I","F","2S","96S","YYYY"<CR> "CEV R",1,"YYYY"<CR> "1H","FID","YYYY"<CR> "1D","45S","YYYY"<CR> "7H","MONTH","DAY","YEAR","HOUR","MIN","SEC","MSEC","YYYY"<CR> "1D","I","I","I","I","I","I","I","YYYY",<CR> "14H","FREQ","SAM/CYC_A","SAM/CYC_D","NUM_OF_CYC","EVENT", "LOCATION","SHOT","TARGETS","IA","IB","IC","IN","IG","3I2","YYYY"<CR> "1D","F","I","I","I","6S","F","I","22S","I","I","I","I","I","I","YYYY"<CR> "13H","IA","IB","IC","IN","IG","VA(kV)","VB(kV)","VC(kV)","VS(kV)","VDC", "FREQ","TRIG","Names of elements in the relay word rows 2 - 49 separated by spaces","YYYY"<CR> Compressed ASCII Commands Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 555 "1D","F","I","I","I","6S","F","I","22S","I","I","I","I","I","I","0BAB"<CR> "13H","IA","IB","IC","IN","IG","VA(kV)","VB(kV)","VC(kV)","VS(kV)","VDC", "FREQ","TRIG","Names of elements in the relay word rows 2 - 49 separated by spaces ","YYYY"<CR> "60D","I","I","I","I","I","F","F","F","F","I","F","2S","96S","0B4B"<CR> "CEV C",1,"020E"<CR> "1H","FID","022C"<CR> "1D","45S","0211"<CR> "7H","MONTH","DAY","YEAR","HOUR","MIN","SEC","MSEC","0BB9"<CR> "1D","I","I","I","I","I","I","I","05F4"<CR> "14H","FREQ","SAM/CYC_A","SAM/CYC_D","NUM_OF_CYC","EVENT", "LOCATION","SHOT","TARGETS","IA","IB","IC","IN","IG","3I2","1B57"<CR> "1D","F","I","I","I","6S","F","I","22S","I","I","I","I","I","I","0BAB"<CR> "13H","IA","IB","IC","IN","IG","VA(kV)","VB(kV)","VC(kV)","VS(kV)","VDC", Date Code 20001006 Compressed ASCII Commands SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 556 <STX> "CAS",5,"01A8"<CR> "CST",1,"01B7"<CR> "1H","FID","022C"<CR> "1D","45S","0211"<CR> "7H","MONTH","DAY","YEAR","HOUR","MIN","SEC","MSEC","0BB9"<CR> "1D","I","I","I","I","I","I","I","05F4"<CR> "23H","IA","IB","IC","IN","VA","VB","VC","VS","MOF","+5V_PS","+5V_REG", "-5V_REG","+12V_PS","-12V_PS","+15V_PS", "-15V_PS","TEMP","RAM","ROM","A/D","CR_RAM", "EEPROM","IO_BRD","271D"<CR> "1D","9S","9S","9S","9S","9S","9S","9S","9S","9S","9S","9S","9S","9S","9S","9S", "9S","9S","9S","9S","9S","9S","9S","9S","1789"<CR> "CHI",1,"01A1"<CR> "1H","FID","022C"<CR> "1D","45S","0211"<CR> "15H","REC_NUM","MONTH","DAY","YEAR","HOUR","MIN","SEC","MSEC", "EVENT","LOCATION","CURR","FREQ","GROUP","SHOT","TARGETS", "1CBB"<CR> "30D","I","I","I","I","I","I","I","I","6S","F","I","F","I","I","22S","0C96"<CR> "CEV",1,"01AB"<CR> "1H","FID","022C"<CR> "1D","45S","0211"<CR> "7H","MONTH","DAY","YEAR","HOUR","MIN","SEC","MSEC","0BB9" "1D","I","I","I","I","I","I","I","05F4"<CR> "14H","FREQ","SAM/CYC_A","SAM/CYC_D","NUM_OF_CYC","EVENT", Compressed ASCII Commands Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 557: Cstatus Command - Sel-351

    “Names of elements in the relay word Rows 2 -53 separated by spaces” field. CSTATUS C – SEL-351 OMMAND Display status data in compressed ASCII format by sending: CST <CR> Date Code 20001006 Compressed ASCII Commands SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 558: Chistory Command - Sel-351

    Display history data in compressed ASCII format by sending: CHI <CR> The relay sends: <STX>"FID","yyyy"<CR> "Relay FID string","yyyy"<CR> "REC_NUM","MONTH","DAY","YEAR","HOUR","MIN","SEC","MSEC", "EVENT","LOCATION","CURR","FREQ","GROUP","SHOT","TARGETS", "yyyy"<CR> xxxx,xxxx,xxxx,xxxx,xxxx,xxxx,xxxx,xxxx,"xxxx",xxxx,xxxx,xxxx,xxxx,xxxx, "xxxx","yyyy"<CR><ETX> (the last line is then repeated for each record) Compressed ASCII Commands Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 559: Cevent Command - Sel-351

    4-byte hex ASCII representation of the checksum. FREQ is the power system frequency at the trigger instant. Date Code 20001006 Compressed ASCII Commands SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 560 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *" E-10 Compressed ASCII Commands Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 561 Labels 50A1 50B1 50C1 50A2 50B2 50C2 50A3 50B3 Bits In this example, the 50A2 element is asserted (logical 1) ; all others are deasserted (logical 0). Date Code 20001006 Compressed ASCII Commands E-11 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 562 Courtesy of NationalSwitchgear.com...

  • Page 563: Appendix F: Setting Negative-Sequence Overcurrent Elements

    Refer to Figure 3.20 for more information on negative-sequence time-overcurrent element 51QT. Date Code 20001006 Setting Negative-Sequence Overcurrent Elements SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 564: Coordination Example

    The coordination example is a generic example that can be used with any relay containing negative-sequence overcurrent elements that operate on 3I magnitude negative-sequence current. The SEL-351 Relay can be inserted as the feeder relay in this example. Note that the overcurrent Setting Negative-Sequence Overcurrent Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 565 SEL-351 Relay overcurrent elements. Coordination Guidelines 1. Start with the furthest downstream negative-sequence overcurrent element (e.g., distribution feeder relay in a substation). 2. Identify the phase overcurrent device (e.g., line recloser, fuse) downstream from the negative- sequence overcurrent element that is of greatest concern for coordination.

  • Page 566: Traditional Phase Coordination

    Applying negative-sequence overcurrent element coordination Guidelines 1 to 3 results in the feeder relay “equivalent” phase overcurrent element (51EP) in Figure F.4. Curve for 51F is shown for comparison only. Setting Negative-Sequence Overcurrent Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 567: Convert "Equivalent" Phase Overcurrent Element Settings To Negative-Sequence Overcurrent Element Settings (Guideline 4

    Guideline 4. The time dial (lever) and curve type of the element remain the same (if the element is a definite-time element, the time delay remains the same). Date Code 20001006 Setting Negative-Sequence Overcurrent Elements SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 568: Negative-Sequence Overcurrent Element Applied At A Distribution Bus (Guideline 5

    It is coordinated with the distribution feeder phase or negative-sequence overcurrent elements and provides more-sensitive and faster phase-to-phase fault backup. Setting Negative-Sequence Overcurrent Elements Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 569: Ground Coordination Concerns

    This conference paper gives many good application examples for negative-sequence overcurrent elements. The focus is on the transmission system, where negative-sequence overcurrent elements provide better sensitivity than zero-sequence overcurrent elements in detecting some single-line-to-ground faults. Date Code 20001006 Setting Negative-Sequence Overcurrent Elements SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 570 Courtesy of NationalSwitchgear.com...

  • Page 571: Appendix G: Setting Sel Ogic ® Control Equations

    (see also Settings Sheets 12 through 16 in the back of Section 9). See the SHO command (Show/View Settings) in Section 10: Serial Port Communications and Commands for a list of the factory settings the SEL-351 Relay ships with in a standard relay shipment. ELAY Most of the protection and control element logic outputs shown in the various figures in Section 3 through Section 8 are Relay Word bits (labeled as such in the figures).

  • Page 572: Phase Time-Overcurrent Element 51Pt Time-Out Indication

    1 or logical 0, respectively. The time-overcurrent elements (like ® Setting SEL Control Equations Date Code 20001006 OGIC SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 573: Sel Ogic Control Equation Operators

    Logic Function rising edge detect falling edge detect parentheses Operators in a SEL Control Equation setting are processed in the order shown in Table G.1. OGIC ® Date Code 20001006 Setting SEL Control Equations OGIC SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 574: Sel Ogic Control Equation Parentheses Operator

    Following are examples of both. Example of NOT Operator ! Applied to Single Element The internal circuit breaker status logic in the SEL-351 Relay operates on 52a circuit breaker auxiliary contact logic. The SEL Control Equation circuit breaker status setting is labeled OGIC 52A.

  • Page 575: Example Of Not Operator ! Applied To Multiple Elements (Within Parentheses

    The rising edge operator / is applied to individual Relay Word bits only – not to groups of elements within parentheses. For example, the SEL Control Equation event report generation setting OGIC uses rising edge operators: ER = /51P + /51G + /OUT3 ® Date Code 20001006 Setting SEL Control Equations OGIC SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 576 (generated by 51G asserting first). The assertion of OUT3 for a breaker failure condition is some appreciable time later and will generate another event report, if the first event report capture has ended when OUT3 asserts. ® Setting SEL Control Equations Date Code 20001006 OGIC SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 577: Sel Ogic Control Equation Falling Edge Operator

    Control Equation trip settings TRCOMM and TRSOTF are not used. The OGIC only effective input into logic gate OR-1 in Figure 5.1 is SEL Control Equation trip setting OGIC ® Date Code 20001006 Setting SEL Control Equations OGIC SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 578 If maximum phase current is above the phase instantaneous overcurrent element pickup setting 50P1P for the reoccurring fault, Relay Word bit 50P1 is in the following state: 50P1 = 1 (logical 1) ® Setting SEL Control Equations Date Code 20001006 OGIC SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 579: Set An Output Contact For Tripping

    Under the SHO Command (Show/View Settings) in Section 10: Serial Port Communications and Commands, note that a number of the factory SEL Control Equation settings are set OGIC directly to 1 or 0. ® Date Code 20001006 Setting SEL Control Equations OGIC SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 580: Sel Ogic Control Equation Limitations

    Control Equation torque control settings 67P1TC through OGIC 51QTC for the overcurrent elements. In the factory settings the SEL-351 Relay ships with in a standard relay shipment, these are all set directly to logical 1. See these factory settings in SHO Command (Show/View Settings) in Section 10: Serial Port Communications and Commands.
  • Page 581 Control Equation settings changes have been made and the settings are saved, the OGIC SEL-351 responds with the following message: xxx Elements and yy Edges remain available indicating that “xxx” Relay Word bits can still be used and “yy” rising or falling edge operators can still be applied in the SEL Control Equations for the particular settings group.
  • Page 582 Frequency Elements 81D1, 81D2, 81D3, 81D4, 81D5, 81D6, Section 3 81D1T, 81D2T, 81D3T, 81D4T, 81D5T, 81D6T Synchronism Check Elements SF, 25A1, 25A2 Section 3 (BSYNCH) ® G-12 Setting SEL Control Equations Date Code 20001006 OGIC SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 583 OUT201 - OUT212 (Model 0351x1) OUT201 - OUT212 (Model 0351x1) Display Points (DP1-DP8) Section 7 Setting Group (SS1-SS6) SG1-SG6 Section 7 Event Report Trigger (ER) Section 12 ® Date Code 20001006 Setting SEL Control Equations G-13 OGIC SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 584 Courtesy of NationalSwitchgear.com...

  • Page 585: Appendix H: Distributed Network Protocol (Dnp) V3.00

    (i.e., MAXDLY and MINDLY). In addition, the SEL-351 monitors received data and treats receipt of data as a DCD indication. This allows RTS to be looped back to CTS in cases where the external transceiver does not support DCD. When the SEL-351 transmits a DNP message, it Date Code 20001006 Distributed Network Protocol (DNP) V3.00...

  • Page 586: Data-Link Operation

    When the SEL-351 decides to transmit on the DNP link, it has to wait if the physical connection is in use. The SEL-351 monitors physical connections by using CTS input (treated as a Data Carrier Detect) and monitoring character receipt.

  • Page 587: Device Profile

    Object Group Request Function Codes Response Function Codes Object Variation Request Qualifiers Response Qualifiers Object Name (optional) Vendor Name: Schweitzer Engineering Laboratories, Inc. Device Name: SEL-351 Highest DNP Level Supported: Device Function: ¨ Master þ Slave For Requests Level 2...
  • Page 588 Expects Binary Input Change Events: ¨ Either time-tagged or non-time-tagged for a single event ¨ Both time-tagged and non-time-tagged for a single event ¨ Configurable (attach explanation) Distributed Network Protocol (DNP) V3.00 Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 589 ¨ Point-by-point list attached ¨ Yes þ No Sends Multi-Fragment Responses: In all cases within the device profile that an item is configurable, it is controlled by SEL-351 settings. Date Code 20001006 Distributed Network Protocol (DNP) V3.00 SEL-351 Instruction Manual...

  • Page 590: Object Table

    BJECT ABLE The supported object, function, and qualifier code combinations are given by the following object table. Table H.2: SEL-351 DNP Object Table Request Response (supported) (may generate) Object Func Qual Func Qual *default Codes Codes Codes Codes Description (dec)
  • Page 591 32-Bit Frozen Analog Input with Time of Freeze 16-Bit Frozen Analog Input with Time of Freeze 32-Bit Frozen Analog Input without Flag 16-Bit Frozen Analog Input without Flag Date Code 20001006 Distributed Network Protocol (DNP) V3.00 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 592 Class 1 Data 1,20,21 6,7,8 Class 2 Data 1,20,21 6,7,8 Class 3 Data 1,20,21 6,7,8 File Identifier Internal Indications index = 7 Storage Object Device Profile Distributed Network Protocol (DNP) V3.00 Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 593: Data Map

    Medium Packed Binary-Coded Decimal Large Packed Binary-Coded Decimal No object 13,14,23 Each version of the SEL-351 has a slightly different data map. The following is the default object ® map supported by the SEL-351 Connectorized wye-connected PTs (see Table 1.1, Table 9.3, and Appendix A).
  • Page 594 Power factor A-, B-, C-, and 3-phase. 30,32 Frequency. 30,32 VDC. 30,32 42,43 A-phase MWhr in and out. 30,32 44,45 B-phase MWhr in and out. H-10 Distributed Network Protocol (DNP) V3.00 Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 595 Relay Word row (usually 2) and multiply that result by 8. This is the index of the right-most element of the Relay Word row of the element in question. Count over to Date Code 20001006 Distributed Network Protocol (DNP) V3.00 H-11 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 596 The Trip/Close bits take precedence over the control field. The control field is interpreted as follows: H-12 Distributed Network Protocol (DNP) V3.00 Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 597: Point Remapping

    The DNP command is only available if DNP has been selected on one of the ports. The DNP command has the following format: DNP [type] where type may be A, B, S, T, or omitted. Date Code 20001006 Distributed Network Protocol (DNP) V3.00 H-13 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 598: Other Versions

    The following is the default object map supported by the SEL-351 Connectorized delta- connected PTs (see Table 1.1, Table 9.3, and Appendix A).
  • Page 599 Table H.4: SEL-351-Delta DNP Data Map DNP Object Index Description Type 01,02 000 - Relay Word, where 50B3 is 0 and 67P2S is 319. 01,02 500 - Relay Word from the SER, encoded same as inputs 000 - 499 with 500 added.
  • Page 600 Fault time in DNP format (high, middle, and low 16 bits). 40,41 Active settings group. The corresponding conventional versions of the SEL-351 Relay differ from their respective Connectorized versions by having different Relay Word layouts (see Table 1.1, Table 9.3, and Appendix A). H-16 Distributed Network Protocol (DNP) V3.00...
  • Page 601 NUMEVE Age of oldest event to force transmit on, seconds (0.0 - 60.0) AGEEVE Time-out for confirmation of unsolicited message, seconds (0 - 50) UTIMEO Date Code 20001006 Distributed Network Protocol (DNP) V3.00 H-17 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 602 Courtesy of NationalSwitchgear.com...

  • Page 603: Appendix I: Mirrored Bits

    IRRORED to exchange information quickly and securely, and with minimal expense. The information exchanged can facilitate remote control, remote sensing, or communications-assisted protection schemes such as POTT, DCB, etc. The SEL-351 supports two M channels, IRRORED differentiated by the channel specifiers A and B. Bits transmitted are called TMB1x through TMB8x, where x is the channel specifier (e.g., A or B), and are controlled by the corresponding...

  • Page 604: Synchronization

    1/4 cycle processing interval. So a counter set to two will again delay a bit by about 1/2 cycle. However, in that same example, a security counter set to two on the SEL-351 will delay a bit by 1/4 cycle, because the SEL-351 is receiving new M...

  • Page 605: Loop-Back Testing

    When the user selects MBT, the baud rate setting will be limited 9600 baud. Note: The MBT mode will not work with PROTO = MB8A or MB8B. Date Code 20001006 ™ IRRORED SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 606 The modem uses the relay’s RTS signal to determine whether the new or old M protocol is in use. IRRORED ™ Date Code 20001006 IRRORED SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 607 Use the CBADPU setting to determine the ratio of channel down time to the total channel time before the relay element CBADA is asserted. The time used in the calculation are those that are available in the COMM records. See the COMM command in the SEL-321 or SEL-351 manuals for a description of the COMM records.
  • Page 608 Supervise the transfer of received data (or default data) to RMB1A - RMB8A with the M IRRORED pickup and dropout security counters. Set the pickup and dropout counters individually for each bit. ™ Date Code 20001006 IRRORED SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

  • Page 609: Mirrored Bits

    IRRORED RMB_Pickup Debounce msgs (1-8) RMB7PU = IRRORED RMB_Dropout Debounce msgs (1-8) RMB7DO = IRRORED RMB_Pickup Debounce msgs (1-8) RMB8PU = IRRORED RMB_Dropout Debounce msgs (1-8) RMB8DO = IRRORED Date Code 20001006 ™ IRRORED SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 610 Courtesy of NationalSwitchgear.com...
  • Page 611 SEL-351 RELAY COMMAND SUMMARY Access Level 0 Access Level 0 is the initial relay access level. The relay automatically returns Command to Access Level 0 when a serial port time-out setting expires or after a QUIT command. The screen prompt is: = Enter Access Level 1.

  • Page 612: Settings

    Show all rows in SSI report recorded on the specified date (see DAT command for date format). d1 d2 Show all rows in SSI report recorded between dates d1 and d2, inclusive. Clears SSI report from nonvolatile memory. Command Summary Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 613 Change Access Level B password to xxxxxx. PAS 2 xxxxxx Change Access Level 2 password to xxxxxx. Entering DISABLE as the password disables the password requirement for the specified access level. Date Code 20001006 Command Summary SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...
  • Page 614 Exits setting editing session, then prompts user to save settings. Ctrl - X Aborts setting editing session without saving changes. Available in firmware versions 1, 2, 3, and 4. Available in firmware versions 3 and 4. Command Summary Date Code 20001006 SEL-351 Instruction Manual Courtesy of NationalSwitchgear.com...

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