ABB REX 521 Technical Reference Manual, General
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ABB REX 521 Technical Reference Manual, General

Protection relay
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Protection Relay
REX 521
Technical Reference Manual, General

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  • Page 1 Protection Relay REX 521 Technical Reference Manual, General...

  • Page 3: Table Of Contents

    4.1.6.3. Calculated analog channels .......22 4.1.6.4. Select Io .............22 4.1.6.5. Rated frequency ..........22 4.1.7. Digital inputs ..............22 4.1.7.1. Filtering of digital inputs ........22 4.1.7.2. Inversion of digital inputs ........23 4.1.8. Outputs ................23 © Copyright 2004 ABB Oy, Distribution Automation, Vaasa, FINLAND...
  • Page 4 4.2. Design description ..............44 4.2.1. Technical data ........44 4.2.2. Terminal diagram of REX 521: Basic ....... 48 4.2.3. Terminal diagram of REX 521: Medium ......49 4.2.4. Terminal diagram of REX 521: High ........ 50 4.2.4.1. Terminal diagram of H08 configuration ....51 4.2.5.
  • Page 5 REX 521 Protection Relay Technical Reference Manual, General 9.2. General principle of application data mapping ......63 9.3. Principle of the protection functions mapping ......64 9.4. Class 2 data ................64 9.5. Default mappings ................65 10.Appendix B: Parameters visible only in the relay ....71 11.Appendix C: Parameters which cause reset ......72...

  • Page 6: About This Manual

    This document and parts thereof must not be reproduced or copied without written permission from ABB Oy, and the contents thereof must not be imparted to a third party nor used for any unauthorized purpose.

  • Page 7: Abbreviations

    1MRS 751107-MUM • Installation Manual 1MRS 750526-MUM • Technical Descriptions of Functions (CD-ROM) 1MRS750889-MCD • Modbus Remote Communication Protocol for REX 521, Technical Description 1MRS755017 • DNP 3.0 Remote Communication Protocol for REF 54_ 1MRS755260 and REX 521, Technical Description Parameter and event lists for REX 521 •...

  • Page 8: Document Revisions

    REX 521 Protection Relay 1MRS 751108-MUM Technical Reference Manual, General Tool-specific manuals • CAP505 Installation and Commissioning Manual 1MRS751273-MEN • CAP505 Operator’s Manual 1MRS751709-MEN • CAP505 Protocol Mapping Tool Operator’s Manual 1MRS755277 • Tools for Relays and Terminals, User’s Guide 1MRS752008-MUM •...

  • Page 9: Introduction

    Introduction 2.1. General The protection relay REX 521 is designed for protection, control, measuring, and supervision in medium voltage networks. Typical applications include incoming and outgoing feeders as well as substation protection. The protection relay is provided with energizing inputs for conventional current and voltage transformers. Also a hardware version with inputs for current and voltage sensors is available.

  • Page 10: Application

    Technical Reference Manual, General 2.2. Application The REX 521 is designed for protection of incoming and outgoing feeders in medium voltage distribution substations. Further, the relay can, for example, be applied to back-up protection of power transformers and back-up for high voltage line protection relays.
  • Page 11 4. 3I>-> and 3I>>-> cannot be set to operate as 3I>, 3I>> or 3I>>> 5. Motor status indication 6. H08 available only with VT version of REX 521. VTs are used to measure phase-to-earth voltages. Calculated phase-to-phase voltages shown by 3U_B Note! Calculated Uo (Uos) used in Sensor versions of H01 and H03 configurations.

  • Page 12: Hardware Versions

    REX 521 Protection Relay 1MRS 751108-MUM Technical Reference Manual, General 2.3. Hardware versions Table 2.3.-1 Hardware versions of REX 521 Relay type REX 521 Version name Basic Medium High Sensor Transformer modules (MIM) Transformers • Current transformers 1/5 A • Current transformers 0.2/1 A •...

  • Page 13: Requirements

    REX 521 1MRS 751108-MUM Protection Relay Technical Reference Manual, General Requirements If the environmental conditions differ from those specified in section “Technical data” on page 44, as to temperature and humidity, or if the environmental conditions around the protection relay contain chemically active gases or dust, the relay should be visually inspected in association with the secondary testing.

  • Page 14: Technical Description

    REX 521 Protection Relay 1MRS 751108-MUM Technical Reference Manual, General Technical description 4.1. Functional description 4.1.1. Parametrization To ensure that a protection function block protects the feeder in the desired manner, the default values of parameters must be checked and set before taking the function block into use.

  • Page 15: Relay Setting Tool View

    Fig. 4.1.1.2.-1 Main dialog box of the Relay Setting Tool 4.1.1.3. Relay Setting Tool view To improve usability, a REX 521 specific pull-down menu, View, with three views has been created to the Relay Setting Tool. views.tif Fig. 4.1.1.3.-1 Relay Setting Tool views The Settings view includes the parameters for setting of all the function blocks.

  • Page 16: Graphical I/O Setting Tool

    4.1.1.4. Graphical I/O Setting Tool To make the external relay parametrization even easier, a REX 521 specific Graphical I/O Setting Tool has been added to the Relay Setting Tool. The Graphical I/O Setting Tool offers a user-friendly environment for better visualization and makes it easier to get a complete overview of the settings.

  • Page 17: Non-Volatile Memory

    REX 521 1MRS 751108-MUM Protection Relay Technical Reference Manual, General When starting again, the relay display shows the text :WARNING EEPROM -> FLASH on the display. This means that the calibration parameters have been read from the MIM card and copied to the non-volatile memory of the CPU card. After ten seconds, the relay will reset itself again, and takes the correct calibration parameters into use.

  • Page 18: Auxiliary Voltage

    The input voltage range of the power supply module is marked on the front panel of the REX 521 unit. The power supply version is specified by a letter in the order number of the protection relay (refer to section “Ordering information” on page 56).

  • Page 19: Overtemperature Indication

    The protection relay measures the analog signals needed for protection, measuring, etc. via galvanically separated matching transformers. In addition, current sensors (Rogowski coil) and voltage dividers developed by ABB can be used with REX 521. The different versions of REX 521 are provided with the following matching...

  • Page 20: Technical Data Of The Measuring Devices

    The technical data of the measuring devices is set using the Relay Setting Tool or via HMI. The set values (Configuration\Meas.devices\) will affect the measurements carried out by REX 521. Values to be set for a current transformer: • rated primary current (1...6000 A) of the current transformer •...
  • Page 21 REX 521 1MRS 751108-MUM Protection Relay Technical Reference Manual, General Values to be set for a current sensor (Rogowski coil): • secondary rated voltage of the current sensor used at the preset primary rated current (100...300 mV) • primary rated current of the current sensor used (1...6000 A) •...

  • Page 22: Calculated Analog Channels

    (U12s, U23s, U31s), calculated from the measured phase voltages (U1, U2, U3). For detailed information about in which configurations the calculated channels are used, see Table 2.-1 in REX 521 Technical Reference Manual, Standard Configurations (see “Related documents” on page 7).

  • Page 23: Inversion Of Digital Inputs

    REX 521 1MRS 751108-MUM Protection Relay Technical Reference Manual, General Input Filter Filtered Input Filter Time Filter Time dipo_rex Fig. 4.1.7.1.-1 Filtering of a digital input The figure above illustrates the input filtering. At the beginning, the input signal is at high state, the first low state is filtered and no input status change is detected.

  • Page 24: Technical Reference Manual, General

    REX 521 Protection Relay 1MRS 751108-MUM Technical Reference Manual, General 4.1.8.1. High-speed power output (HSPO) The high-speed power output HSPO1 can be connected as a double-pole output where the object to be controlled (for example a circuit breaker) is electrically connected between the two relay contacts, see the Figure 4.1.8.1.-1 below.

  • Page 25: Signalling Outputs (So)

    REX 521 1MRS 751108-MUM Protection Relay Technical Reference Manual, General PO1...3 PO1connrex Fig. 4.1.8.2.-1 Single-pole power outputs (PO1...3) 4.1.8.3. Signalling outputs (SO) The signalling relay outputs (SO1 and SO2) are not heavy-duty outputs and thus they cannot be used for controlling, for example, a circuit breaker. Available relay contacts are Normally Open/Normally Closed type (NO/NC), see the Figure 4.1.8.3.-1 below.

  • Page 26: Trip-Circuit Supervision

    REX 521 Protection Relay 1MRS 751108-MUM Technical Reference Manual, General When testing the general output relays, the user should notice, that normal operation of the relay cannot be disconnected. If an output relay is permanently activated by the configuration, it cannot be deactivated for testing.
  • Page 27 REX 521 1MRS 751108-MUM Protection Relay Technical Reference Manual, General Should the external shunt resistance be used, it has to be calculated not to interfere with the functionality of the supervision or the trip coil. Too high a resistance will...

  • Page 28: Self-Supervision

    REX 521 Protection Relay 1MRS 751108-MUM Technical Reference Manual, General X4.2 TCS1 TCSSTATE ALARM CBPOS_open TCS blocking tcsopen Fig. 4.1.10.-2 Operating principle of the trip-circuit supervision, with an external resistor. The TCS blocking switch is open, enabling trip-circuit supervision independent of circuit breaker position.

  • Page 29: 2.Fault Indication Texts

    REX 521 1MRS 751108-MUM Protection Relay Technical Reference Manual, General Table 4.1.11-1 Self-supervision functions Supervised object Supervision method Execution frequency RAM memories Write and read of all memory 40 B / 200 ms locations Nonvolatile memories Checksum When data is fetched...
  • Page 30 REX 521 Protection Relay 1MRS 751108-MUM Technical Reference Manual, General Normal condition Fault condition IRFoutputrex Fig. 4.1.11.1.-1 Self-supervision output (IRF) When a fault has been detected, the green READY LED indicator starts blinking, a fault indication text is displayed on the HMI and an event “IRF activated” (E31) is generated over serial communication.

  • Page 31: Serial Communication

    The protection relay has two serial communication ports, one on the front panel and the other on the rear panel. The connector located on the front panel is a standard ABB optical connector that is intended to be used for setting the parameters of the protection relay. During the transmission of the parameters, an interface cable is connected between the relay and the standard RS-232 interface of a PC, running the Relay Setting Tool.

  • Page 32: 1.Optical Communication Port On The Rear Panel

    REX 521 Protection Relay 1MRS 751108-MUM Technical Reference Manual, General 4.1.12.1. Optical communication port on the rear panel The fibre-optic interface on the rear panel contains two optical connectors, Tx (X3.2) and Rx (X3.3). The connectors are used for interfacing the unit to an optical fibre bus using either plastic fibre or glass fibre cables.

  • Page 33: 3.Front Panel Optical Connection For A Pc

    4.1.12.3. Front panel optical connection for a PC The front connector is standardized for ABB relay products and requires an opto- cable (ABB art. No 1MKC950001-1). The connector supports only the SPA bus protocol, and is connected to the RS-232 port of a standard PC.
  • Page 34 REX 521 Protection Relay 1MRS 751108-MUM Technical Reference Manual, General MicroSCADA COM-port (RS 232) COM-port (RS 232) Protocol X SPA-bus 4 5 6 7 8 1 2 3 4 SPA-ZC22 POWE SPA-ZC 22 5B0M 1 2 3 4 5 6 7 8 1 2 3 4 Ser.

  • Page 35: Lon Bus

    The system very often resembles the system in the figure below. The protection, control or alarm functions are implemented by using REX 521 protection relays and other RED 500 series protection relays, SPACOM units or other SPA bus devices (devices connected to the system via the SPA bus).
  • Page 36 Neuron chip. This operation takes approximately 15 seconds according to LAG 1.4. From the front panel, the user should configure the Node number, the Subnet number and the Bit rate of REX 521 device. The LON bus event buffer includes 150 last events.

  • Page 37: 7.Iec 60870-5-103 Bus

    The physical bus topology is star-based. A star-coupler unit, for example RER 125, is needed for connecting the REX 521 unit to a control system.The line idle state of the fibre-optic interface is configurable (“light on” and “light off”) with a parameter Tx mode.
  • Page 38 At physical level, the Modbus systems may use different physical interfaces, for example, RS-485 or RS-232 (see Figure 4.1.12.8.-1). Both the RS-485 two-wire interface and the optical RS-232 interface are supported by REX 521. The recommended RS-485 bus topology with Modbus is a chain of devices with line terminations at the both ends of the bus.

  • Page 39: 9.Dnp 3.0 Bus

    REF 54_ relays REX 521 Fig. 4.1.12.9.-1 Example of a DNP 3.0 system For more information of DNP 3.0 in REX 521, see DNP 3.0 Communication Protocol for REF 54_ and REX 521 Technical Description (see “Related documents” on page 7).

  • Page 40: Display Panel (Hmi)

    REX 521 Protection Relay 1MRS 751108-MUM Technical Reference Manual, General “Net Messages” state The parameter should be in the “Net Messages” state if the time synchronization is taken from one of the following sources: SPA bus • Time synchronization is received from the SPA master device.

  • Page 41: Indication Leds

    REX 521 1MRS 751108-MUM Protection Relay Technical Reference Manual, General 4.1.15. Indication LEDs The relay is provided with three indication LEDs (green, yellow and red). With latching/non-latching, steady/blinking light the LEDs indicate different states and operations of the relay. For more information, see Operator’s Manual...

  • Page 42: 2.Writing Signal Names On Alarm Led Label

    1. Use the pre-printed transparency. 2. Write the names on the transparency with permanent pen or by typewriter. 3. Put the label in the pocket on the front panel of REX 521. When writing signal names on the label by using computer 1.
  • Page 43 Use only laser printers for printing. Ink jet printers are not suitable for printing on label transparencies. 4. Put the label in the pocket on the front panel of REX 521.

  • Page 44: Design Description

    REX 521 Protection Relay 1MRS 751108-MUM Technical Reference Manual, General 4.2. Design description 4.2.1. Technical data Table 4.2.1-1 Energizing inputs Rated frequency 50.0/60.0 Hz Current inputs Rated current 0,2 A/1 A/5 A Thermal withstand continuously 1.5 A/4 A/20 A capability...
  • Page 45 REX 521 1MRS 751108-MUM Protection Relay Technical Reference Manual, General Table 4.2.1-5 Power outputs Max. system voltage 250 V AC/DC Continuous carry Make and carry for 0.5 s 30 A Make and carry for 3 s 15 A Breaking capacity when control 5 A/3 A/1 A circuit time constant L/R <40 ms, at...
  • Page 46 Data communication Rear interface, connector X3.2 and Fibre-optic interface X3.3 protocol SPA, IEC_103, Modbus, DNP 3.0 Also LON in the REX 521 xxxxL versions. Rear interface, RS-485 connection connector X3.1:9,10 protocol SPA, Modbus, DNP 3.0 Front panel optical RS 232 connection...
  • Page 47 The last 50 events are recorded. Data recording records operate values Protection functions See REX 521 Technical Reference Manual, Standard Configurations (see “Related documents” on page 7). Control functions See REX 521 Technical Reference Manual, Standard Configurations (see “Related documents” on page 7).

  • Page 48: Terminal Diagram Of Rex 521: Basic

    REX 521 Protection Relay 1MRS 751108-MUM Technical Reference Manual, General 4.2.2. Terminal diagram of REX 521: Basic X4.1 ACFail Mains X1.1 TempAlarm I R F X4.2 ** ) HSPO1 TCS1 X4.2 X3.2 SERIAL BUS X3.3 SERIAL BUS X3.1 DATA A...

  • Page 49: Terminal Diagram Of Rex 521: Medium

    REX 521 1MRS 751108-MUM Protection Relay Technical Reference Manual, General 4.2.3. Terminal diagram of REX 521: Medium X4.1 ACFail Mains X1.1 TempAlarm I R F 100V 0,2A X4.2 HSPO1 TCS1 X4.2 X3.2 SERIAL BUS X3.3 SERIAL BUS X3.1 DATA A...

  • Page 50: Terminal Diagram Of Rex 521: High

    REX 521 Protection Relay 1MRS 751108-MUM Technical Reference Manual, General 4.2.4. Terminal diagram of REX 521: High X4.1 ACFail Mains X1.1 TempAlarm 100V 100V I R F 100V 100V 0,2A X4.2 ***) HSPO1 TCS1 X4.2 X3.2 SERIAL BUS X3.3 SERIAL BUS X3.1...

  • Page 51: Terminal Diagram Of H08 Configuration

    X4.2 X3.2 SERIAL BUS X3.3 SERIAL BUS X3.1 DATA A RS-485 DATA B *) Power flow direction **) The jumper is not assembled by default when the protection relay is delivered Fig. 4.2.4.1.-1 Terminal diagram of REX 521: H08 configuration...

  • Page 52: Terminal Diagram Of Rex 521: Sensor

    REX 521 Protection Relay 1MRS 751108-MUM Technical Reference Manual, General 4.2.5. Terminal diagram of REX 521: Sensor X4.1 ACFail Mains X1.1 TempAlarm I R F 100V 0,2A Sensor Voltage input, U X2.1 DIFF Sensor Voltage input, U X2.2 DIFF Sensor Voltage input, U X2.3...

  • Page 53: Terminal Connections

    X4.1 Data A RS-485 Data B Service pin 1 X4.2 X3.2 X3.3 Made in Finland RearViewBasic_a Fig. 4.2.6.-1 Rear view of REX 521 Basic X4.1 X3.1 Data A RS-485 Data B Service pin X4.2 X3.2 X3.3 Made in Finland RearViewMedium RearViewMedium_a Fig.
  • Page 54 X4.1 X3.1 Data A RS-485 Data B Service pin X4.2 X3.2 X3.3 Made in Finland RearViewMedium RearViewHigh_a Fig. 4.2.6.-3 Rear view of REX 521 High X4.1 X3.1 X2.1 X2.2 Data A RS-485 Data B X2.3 Service pin X4.2 X2.4 X3.2 X2.5...

  • Page 55: Service

    To achieve the best possible operation accuracy, all parts of a REX 521 product have been calibrated together. Thus, each product forms a whole for which no separate spare parts can be supplied.

  • Page 56: Ordering Information

    Type of hardware: B = Basic, M = Medium, H = High, S = High sensor Revision OrderNo_b Fig. 6.-1 Order number of REX 521 English is always available in REX 521. When ordering, the other additional language must be defined according to the table below. Table 6.-1 Display language codes Code...

  • Page 57: Revision History Of Rex 521

    Technical Reference Manual, General Revision history of REX 521 7.1. Revision identification The main releases of REX 521 products are differentiated with the revision and configuration revision letters in the order number (see “Ordering information” on page 56). Table 7.1.-1...

  • Page 58: Index

    REX 521 Protection Relay 1MRS 751108-MUM Technical Reference Manual, General Index Alarm LEDs ..................... 41 Activating ................... 41 Clearing a certain LED ............... 42 Reading actual state ................41 Testing ....................42 Alarms Acknowledging .................. 41 Clearing, see Acknowledging Enabling ..................... 41 Analogue channels ...................
  • Page 59 Modbus ..................... 32 Non-volatile memory ................17 Optical RS-232 interface ................38 Order number .................... 19 Ordering REX 521 protection relays ............57 Outputs ..................... 23 High-speed power output ..............24 Signalling relay outputs ..............25 Single-pole power outputs ..............24 Testing ....................
  • Page 60 Relay parameters ..................71 Relay Setting Tool ..................14 Requirements .................... 13 Restoring factory settings ................. 16 Revisions ....................58 REX 521 protection relay Application area ................. 10 General information ................9 Rogowski coil ..................19, 21 Rogowski coil values ................21 RS-232 interface ..................
  • Page 61 REX 521 1MRS 751108-MUM Protection Relay Technical Reference Manual, General Temperature supervision ................19 Terminal connections ................53 Terminal diagrams Basic ....................48 High ....................50 Configuration H08 ................ 51 Medium ....................49 Sensor ....................52 Tests ......................45 Time synchronization ................39 Trip-circuit supervision ..............

  • Page 62: Appendix A: Iec 60870-5-103 Bus

    Private definitions are basically used because of two reasons: 1. The standard does not define the signal. 2. The signal is defined by the standard but the REX 521 application signal interface differs from this model. Class 1 data buffering and priorities The internal IEC 60870-5-103/Class 1 buffer inside the REX 521 unit can store up to 50 spontaneous events.

  • Page 63: Principle Of The Protection Functions Mapping

    Meas I ASDU can have four different profiles and Meas II has one profile. These five profiles are supported in REX 521. In addition, there are six more private class 2 ASDU frames defined. The user can choose which one of these eleven measurand sets to use.

  • Page 64: Default Mappings

    REX 521 Protection Relay 1MRS 751108-MUM Technical Reference Manual, General 9.5. Default mappings Explanations to the Table 9.5.-1: Status According to the IEC 60870-5-103 standard According to “Digitale Stationsleittechnik - Ergänze Empfehlungen zur Anwendung in Verteilnetzstationen” Private definition Function type...
  • Page 65 REX 521 1MRS 751108-MUM Protection Relay Technical Reference Manual, General Table 9.5.-1 Class 1 data signals (Continued) Function block Info Function block Ftyp Typ COT IEC name (ABB name) 3I>>> Non-directional overcurrent START>>> 1, 9 NOC3Inst 3I>>> Non-directional overcurrent TRIP>>>...
  • Page 66 REX 521 Protection Relay 1MRS 751108-MUM Technical Reference Manual, General Table 9.5.-1 Class 1 data signals (Continued) Function block Info Function block Ftyp Typ COT IEC name (ABB name) I<->0 CB1: closing time COCB1 I<->0 CB1: command status COCB1 Control position (local/remote)
  • Page 67 REX 521 1MRS 751108-MUM Protection Relay Technical Reference Manual, General Table 9.5.-1 Class 1 data signals (Continued) Function block Info Function block Ftyp Typ COT IEC name (ABB name) Underfrequency or overfrequency, St1, START2 1,9 Freq1St1 Underfrequency or overfrequency, St1, TRIP2...
  • Page 68 REX 521 Protection Relay 1MRS 751108-MUM Technical Reference Manual, General Table 9.5.-2 Commands Info Commands Ftyp resp I<->0 CB1: control CB1 20,21 Output relay 1 control (HSPO1) P 20,21 Output relay 2 control (PO1) 20,21 Output relay 3 control (PO2)
  • Page 69 REX 521 1MRS 751108-MUM Protection Relay Technical Reference Manual, General Example If the set No 11 is used, the ASDU octets will look like in the following figure: TypeId VSQ = Num of data Function type Information number Data1 Data2...

  • Page 70: Appendix B: Parameters Visible Only In The Relay

    REX 521 Protection Relay 1MRS 751108-MUM Technical Reference Manual, General Appendix B: Parameters visible only in the relay Input 1 state Input 2 state Input 3 state Input 4 state Input 5 state Input 6 state Input 7 state Input 8 state...

  • Page 71: Appendix C: Parameters Which Cause Reset

    REX 521 1MRS 751108-MUM Protection Relay Technical Reference Manual, General Appendix C: Parameters which cause reset Rated frequency Select Io Voltage combine IL1: scaling IL2: scaling IL3: scaling Io: scaling Iob: scaling Uo: scaling U1: scaling U2: scaling U3: scaling...
  • Page 72 REX 521 Protection Relay 1MRS 751108-MUM Technical Reference Manual, General Current trafo 5 Corr. factor 1 Current trafo 5 Displ. error 1 Current trafo 5 Corr. factor 2 Current trafo 5 Displ. error 2 Voltage trafo 1 Second. voltage Voltage trafo 1...

  • Page 73: Appendix D: Parameters Which Require Test Mode

    REX 521 1MRS 751108-MUM Protection Relay Technical Reference Manual, General Appendix D: Parameters which require test mode Input 1 state Input 2 state Input 3 state Input 4 state Input 5 state Input 6 state Input 7 state Input 8 state...
  • Page 76 ABB Oy Distribution Automation P.O. Box 699 FI-65101 Vaasa FINLAND Tel. +358 10 22 11 Fax. +358 10 224 1094 www.abb.com/substationautomation...

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