ABB RELION 630 Series Applications Manual
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ABB RELION 630 Series Applications Manual

Motor protection and control
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RELION® 630 SERIES
Motor Protection and Control
REM630
Application Manual

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Summary of Contents for ABB RELION 630 Series

  • Page 1 — RELION® 630 SERIES Motor Protection and Control REM630 Application Manual...
  • Page 3 Document ID: 1MRS756785 Issued: 2019-02-25 Revision: G Product version: 1.3 © Copyright 2019 ABB. All rights reserved...
  • Page 4 Copyright This document and parts thereof must not be reproduced or copied without written permission from ABB, and the contents thereof must not be imparted to a third party, nor used for any unauthorized purpose. The software or hardware described in this document is furnished under a license and may be used, copied, or disclosed only in accordance with the terms of such license.
  • Page 5 In case any errors are detected, the reader is kindly requested to notify the manufacturer. Other than under explicit contractual commitments, in no event shall ABB be responsible or liable for any loss or damage resulting from the use of this manual or the application of the equipment.
  • Page 6 (EMC Directive 2004/108/EC) and concerning electrical equipment for use within specified voltage limits (Low-voltage directive 2006/95/EC). This conformity is the result of tests conducted by ABB in accordance with the product standards EN 50263 and EN 60255-26 for the EMC directive, and with the product standards EN 60255-1 and EN 60255-27 for the low voltage directive.

  • Page 7: Table Of Contents

    Table of contents Table of contents Section 1 Introduction...............5 This manual..................5 Intended audience................5 Product documentation...............6 Product documentation set............6 Document revision history............. 6 Related documentation..............7 Symbols and conventions..............7 Symbols..................7 Document conventions..............8 Functions, codes and symbols............8 Section 2 REM630 overview............13 Overview...................13 Product version history..............
  • Page 8 Table of contents Thermal overload protection MPTTR........31 Emergency start ESMGAPC..........32 Motor startup supervision STTPMSU........32 Motor stall protection JAMPTOC..........32 Loss of load protection LOFLPTUC........33 Phase reversal protection PREVPTOC........33 Motor negative-sequence overcurrent protection MNSPTOC................34 Non-directional overcurrent protection PHxPTOC....35 Non-directional earth-fault protection EFxPTOC....35 Positive-sequence overvoltage protection PSPTOV....
  • Page 9 Table of contents Non-directional earth-fault protection EFxPTOC....54 Positive-sequence overvoltage protection PSPTOV....54 Positive-sequence undervoltage protection PSPTUV.... 54 Negative-sequence overvoltage protection NSPTOV.... 54 Circuit-breaker failure protection CCBRBRF......55 Tripping logic TRPPTRC............55 Combined operate and start alarm signal......56 Combined restart inhibit and restart enable signal....56 Supervision functions..............

  • Page 11: Section 1 Introduction

    Section 1 1MRS756785 G Introduction Section 1 Introduction This manual The application manual contains descriptions of preconfigurations. The manual can be used as a reference for configuring control, protection, measurement, recording and LED functions. The manual can also be used when creating configurations according to specific application requirements.

  • Page 12: Product Documentation

    Commissioning manual GUID-C8721A2B-EEB9-4880-A812-849E1A42B02C V1 EN Figure 1: The intended use of documents during the product life cycle Product series- and product-specific manuals can be downloaded from the ABB Web site http://www.abb.com/relion. 1.3.2 Document revision history Document revision/date Product version History...

  • Page 13: Related Documentation

    Section 1 1MRS756785 G Introduction Download the latest documents from the ABB Web site http://www.abb.com/substationautomation. 1.3.3 Related documentation Name of the document Document ID DNP3 Communication Protocol Manual 1MRS756789 IEC 61850 Communication Protocol Manual 1MRS756793 IEC 60870-5-103 Communication Protocol Manual...

  • Page 14: Document Conventions

    Section 1 1MRS756785 G Introduction Although warning hazards are related to personal injury, it is necessary to understand that under certain operational conditions, operation of damaged equipment may result in degraded process performance leading to personal injury or death. Therefore, comply fully with all warning and caution notices.
  • Page 15 Section 1 1MRS756785 G Introduction Description IEC 61850 IEC 60617 ANSI Directional earth-fault protection, low DEFLPDEF I0> -> 67N-1 stage Directional earth-fault protection, high DEFHPDEF I0>> -> 67N-2 stage Rotor earth-fault protection MREFPTOC Io>R Negative-sequence overcurrent protection for machines MNSPTOC I2>G/M 46G/46M Phase-reversal protection...
  • Page 16 Section 1 1MRS756785 G Introduction Description IEC 61850 IEC 60617 ANSI Generic process I/O Single point control (8 signals) SPC8GGIO Double point indication DPGGIO Single point indication SPGGIO Generic measured value MVGGIO Logic Rotating Switch for function SLGGIO selection and LHMI presentation Selector mini switch VSGGIO Pulse counter for energy metering...
  • Page 17 Section 1 1MRS756785 G Introduction Description IEC 61850 IEC 60617 ANSI Binary receive GOOSEBINRCV Double point receive GOOSEDPRCV Interlock receive GOOSEINTLKRCV Integer receive GOOSEINTRCV Measured value receive GOOSEMVRCV Single point receive GOOSESPRCV REM630 Application Manual...

  • Page 19: Section 2 Rem630 Overview

    Overview REM630 is a comprehensive motor management relay for protection, control, measuring and supervision of medium and large synchronous and asynchronous motors in medium voltage industrial power systems. REM630 is a member of ABB’s ® Relion product family and a part of its 630 series characterized by functional scalability and flexible configurability.

  • Page 20: Operation Functionality

    IED Users • IED Compare • Communication Management • Configuration Migration Download connectivity packages from the ABB Web site http://www.abb.com/substationautomation or directly with Update Manager in PCM600. Operation functionality 2.2.1 Product variants The IED capabilities can be adjusted by selecting a product variant. The IED capabilities can be extended by adding HW and/or SW options to the basic variant.

  • Page 21: Physical Hardware

    Section 2 1MRS756785 G REM630 overview • Positive-sequence overvoltage protection • Positive-sequence undervoltage protection • Negative-sequence overvoltage protection • Stabilized differential protection for motors • Additional functions for synchronous motor • Reverse power/directional overpower protection • Three-phase underexcitation protection • Rotor E/F protection Physical hardware The mechanical design of the IED is based on a robust mechanical rack.

  • Page 22: Local Hmi

    Section 2 1MRS756785 G REM630 overview Content options Binary input and 3 normally open power output contacts output module 1 change-over signalling contact 5 additional signalling contacts 9 binary control inputs RTD input and mA output module 8 RTD-inputs (sensor/R/V/mA) 4 outputs (mA) All external wiring, that is CT and VT connectors, BI/O connectors, power supply connector and communication connections, can be disconnected from the IED...

  • Page 23: Display

    Section 2 1MRS756785 G REM630 overview 2.4.1 Display The LHMI includes a graphical monochrome display with a resolution of 320 x 240 pixels. The character size can vary. The amount of characters and rows fitting the view depends on the character size and the view that is shown. The display view is divided into four basic areas.
  • Page 24 Section 2 1MRS756785 G REM630 overview GUID-6828CE38-2B88-4BB5-8F29-27D2AC27CC18 V1 EN Figure 4: Function button panel The alarm LED panel shows on request the alarm text labels for the alarm LEDs. GUID-3CBCBC36-EFCE-43A0-9D62-8D88AD6B6287 V1 EN Figure 5: Alarm LED panel The function button and alarm LED panels are not visible at the same time. Each panel is shown by pressing one of the function buttons or the Multipage button.

  • Page 25: Leds

    Section 2 1MRS756785 G REM630 overview 2.4.2 LEDs The LHMI includes three protection status LEDs above the display: Ready, Start and Trip. There are 15 programmable alarm LEDs on the front of the LHMI. Each LED can indicate three states with the colors: green, yellow and red. The alarm texts related to each three-color LED are divided into three pages.
  • Page 26 Section 2 1MRS756785 G REM630 overview WHMI is disabled by default. To enable the WHMI, select Main menu/Configuration/HMI/Web HMI/Operation via the LHMI. WHMI offers several functions. • Alarm indications and event lists • System supervision • Parameter settings • Measurement display •...

  • Page 27: Authorization

    Section 2 1MRS756785 G REM630 overview Authorization At delivery, logging on to the IED is not required to be able to use the LHMI. The IED user has full access to the IED as a SuperUser until users and passwords are created with PCM600 and written into the IED.
  • Page 28 Section 2 1MRS756785 G REM630 overview GOOSE messaging. Analog GOOSE messaging enables fast transfer of analog measurement values over the station bus, thus facilitating for example sharing of RTD input values, such as surrounding temperature values, to other relay applications. The protection relay interoperates with other IEC 61850 compliant devices, tools and systems and simultaneously reports events to five different clients on the IEC 61850 station bus.

  • Page 29: Section 3 Rem630 Variants

    Section 3 1MRS756785 G REM630 variants Section 3 REM630 variants Presentation of preconfigurations The 630 series protection relays are offered with optional factory-made preconfigurations for various applications. The preconfigurations contribute to faster commissioning and less engineering of the protection relay. The preconfigurations include default functionality typically needed for a specific application.

  • Page 30: Preconfigurations

    Section 3 1MRS756785 G REM630 variants 3.1.1 Preconfigurations Table 4: REM630 preconfiguration ordering options Description Preconfiguration Preconfiguration A for asynchronous motor Preconfiguration B for asynchronous motor including differential protection Number of instances available Table 5: Functions used in preconfigurations Description Protection Three-phase non-directional overcurrent protection, low stage Three-phase non-directional overcurrent protection, instantaneous...
  • Page 31 Section 3 1MRS756785 G REM630 variants Description Three-phase underexcitation protection Circuit breaker failure protection Tripping logic Multipurpose analog protection Control Bay control Interlocking interface Circuit breaker/disconnector control Circuit breaker Disconnector Local/remote switch interface Generic process I/O Single point control (8 signals) Double point indication Single point indication Generic measured value...

  • Page 32: Preconfiguration A For Asynchronous Motor

    Section 3 1MRS756785 G REM630 variants Description Analog channels 1-10 (samples) Analog channels 11-20 (samples) Analog channels 21-30 (calc. val.) Analog channels 31-40 (calc. val.) Binary channels 1-16 Binary channels 17-32 Binary channels 33-48 Binary channels 49-64 Station communication (GOOSE) Binary receive Double point receive Interlock receive...

  • Page 33: Functions

    Section 3 1MRS756785 G REM630 variants 3.2.2 Functions REM630 MOTOR PROTECTION AND CONTROL IED PRE- Preconfiguration A for asynchronous motor CONFIGURATION PROTECTION LOCAL HMI * ALSO AVAILABLE - 5 × prog. push buttons on LHMI 1× 1× - Disturbance and fault recorders I→O - IED self-supervision - Local/Remote push button on LHMI...

  • Page 34: Input/Output Signal Interfaces

    Section 3 1MRS756785 G REM630 variants 3.2.3 Input/output signal interfaces Table 6: Interface of binary inputs Hardware module instance Hardware channel Description Circuit breaker closed Circuit breaker open Circuit breaker truck in Circuit breaker truck out Earth switch closed Earth switch open External restart inhibit Speed switch External trip...

  • Page 35: Preprocessing Blocks And Fixed Signals

    Section 3 1MRS756785 G REM630 variants Table 8: Interface of analog inputs Hardware module instance Hardware channel Description AIM_2 Phase current IL1 AIM_2 Phase current IL2 AIM_2 Phase current IL3 Neutral current I AIM_2 AIM_2 Not connected AIM_2 Not available AIM_2 Phase voltage UL1 AIM_2...
  • Page 36 Section 3 1MRS756785 G REM630 variants Circuit-breaker control function The circuit breaker is controlled by a combination of switch interlocking (SCILO), switch controller (GNRLCSWI) and circuit breaker controller (DAXCBR) functions. The position information of the circuit breaker and the truck are connected to DAXCBR.

  • Page 37: Protection Functions

    Section 3 1MRS756785 G REM630 variants GUID-02640926-724F-4CFA-B189-F643DA17300B V1 EN Figure 9: Apparatus control 3.2.6 Protection functions 3.2.6.1 Thermal overload protection MPTTR The three-phase thermal overload protection function is designed to be used for protecting electric motors from overheating. The function calculates the thermal level on the basis of the measured motor load current, rated motor current, and calculated negative sequence current.

  • Page 38: Emergency Start Esmgapc

    Section 3 1MRS756785 G REM630 variants The thermal overload alarm and trip provide an LED indication on the LHMI. The thermal overload alarm, thermal overload trip and restart inhibit signals are connected to the disturbance recorders. 3.2.6.2 Emergency start ESMGAPC Emergency start function is used in an emergency where motor needs to be started even with a knowledge that it may result into damage to the motor.

  • Page 39: Loss Of Load Protection Loflptuc

    Section 3 1MRS756785 G REM630 variants GUID-658AB3F3-DFE0-4896-BA9B-BFDDCFC4905B V2 EN Figure 10: Motor load jam protection 3.2.6.5 Loss of load protection LOFLPTUC The loss of load protection is used for detecting sudden load loss which is considered as a fault condition. The set of three phase currents, I3P, is connected to the inputs and the function operates when all the phase currents fall below the set level but stay above the set de- energization level.

  • Page 40: Motor Negative-Sequence Overcurrent Protection Mnsptoc

    Section 3 1MRS756785 G REM630 variants operates when the negative-sequence current exceeds the corresponding set limits. Phase reversal protection is blocked when current circuit supervision detects a failure. Operate signal is used to trigger the disturbance recorder. 3.2.6.7 Motor negative-sequence overcurrent protection MNSPTOC Two instances of negative-sequence overcurrent detection are provided for protection against single-phasing, unbalance load or unsymmetrical voltage.

  • Page 41: Non-Directional Overcurrent Protection Phxptoc

    Section 3 1MRS756785 G REM630 variants 3.2.6.8 Non-directional overcurrent protection PHxPTOC The three-phase non-directional overcurrent functions are used for non-directional one-phase, two-phase and three-phase overcurrent and short-circuit protection with definite time or various inverse definite minimum time (IDMT) characteristic. The operation of a stage is based on three measuring principles: DFT, RMS or peak-to- peak values.

  • Page 42: Positive-Sequence Undervoltage Protection Psptuv

    Section 3 1MRS756785 G REM630 variants 3.2.6.11 Positive-sequence undervoltage protection PSPTUV The positive-sequence undervoltage function blocks are used for positive-sequence undervoltage protection with definite-time characteristic. The set of three phase voltages, U3P, is connected to the inputs. The operate and start signals from the positive-sequence overvoltage function is used to trigger the disturbance recorder.

  • Page 43: Circuit-Breaker Failure Protection Ccbrbrf

    Section 3 1MRS756785 G REM630 variants 3.2.6.13 Circuit-breaker failure protection CCBRBRF The function is activated by the common operate command from the protection functions. The breaker failure function issues a backup trip command to adjacent circuit breakers in case the main circuit breaker fails to trip for the protected component.

  • Page 44: Combined Operate And Start Alarm Signal

    Section 3 1MRS756785 G REM630 variants 3.2.6.15 Combined operate and start alarm signal The operate outputs of all protection functions are combined in an OR-gate to get a common Operate output. This common operate signal is connected to a tripping logic. It is also available as an alarm binary output, PSM SO1, with a settable minimum alarm delay of 80 ms.

  • Page 45: Circuit-Breaker Condition Monitoring Sscbr

    Section 3 1MRS756785 G REM630 variants An alarm is available on failure of the secondary circuits. Alarms are recorded by a disturbance recorder. 3.2.7.3 Circuit-breaker condition monitoring SSCBR The circuit-breaker condition monitoring function checks for the health of the circuit breaker.
  • Page 46 Section 3 1MRS756785 G REM630 variants • Current • Current sequence component • Residual current • Voltage • Power • Energy The measured quantities can be viewed in the measurement menu on the LHMI. All analog input channels are connected to the analog disturbance recorder. When any of these analog values violate the upper or lower threshold limits, the recorder unit is triggered which in turn will record all the signals connected to the recorder.

  • Page 47: Binary Recording And Led Configuration

    Section 3 1MRS756785 G REM630 variants GUID-0702CD3B-BCC8-47AC-8610-983D014FBFE0 V1 EN Figure 15: Measurement and analog recording functions 3.2.9 Binary recording and LED configuration All of the start and operate outputs from the respective protection functions, various alarms from supervision functions, and important signals from control and protective functions are connected to a binary recorder.
  • Page 48 Section 3 1MRS756785 G REM630 variants Channel ID Description Channel 13 Start of high stage earth-fault protection Channel 14 Operate of high stage earth- fault protection operate Channel 15 Operate of phase reversal protection Channel 16 Operate of loss of load protection Channel 17 Start of positive-sequence overvoltage protection Channel 18...

  • Page 49: Preconfiguration B For Asynchronous Motor Including Differential Protection

    Section 3 1MRS756785 G REM630 variants The LEDs are configured for alarm indications. Table 11: LEDs configured on LHMI alarm page 1 LED No LED color Description LED 1 Yellow Start from OC LED 1 Operate from OC LED 2 Yellow Combined start from EF LED 2...
  • Page 50 Section 3 1MRS756785 G REM630 variants The preconfiguration includes: • Control functions • Current protection functions including stabilized differential protection • Voltage protection functions • Supervision functions • Disturbance recorders • LEDs' configuration • Measurement functions REM630 Application Manual...

  • Page 51: Functions

    Section 3 1MRS756785 G REM630 variants 3.3.2 Functions REM630 MOTOR PROTECTION AND CONTROL IED PRE- Preconfiguration B for asynchronous motor including differential protection CONFIGURATION PROTECTION LOCAL HMI * ALSO AVAILABLE - 5 × prog. push buttons on LHMI 1× 1× - Disturbance and fault recorders I→O - IED self-supervision...
  • Page 52 Section 3 1MRS756785 G REM630 variants Table 12: Interface of binary inputs Hardware module instance Hardware channel Description Circuit breaker closed Circuit breaker open Circuit breaker truck in Circuit breaker truck out Earth switch closed Earth switch open External restart inhibit Speed switch External trip BI10...

  • Page 53: Preprocessing Blocks And Fixed Signals

    Section 3 1MRS756785 G REM630 variants Table 14: Interface of analog inputs Hardware module instance Hardware channel Description AIM_2 Line-side phase current, IL1 AIM_2 Line-side phase current, IL2 AIM_2 Line-side phase current, IL3 AIM_2 Neutral current, Io AIM_2 Neutral-side phase current, IL1_N AIM_2 Neutral-side phase current, IL2_N AIM_2...
  • Page 54 Section 3 1MRS756785 G REM630 variants Circuit-breaker control function The circuit breaker is controlled by a combination of switch interlocking (SCILO), switch controller (GNRLCSWI) and circuit breaker controller (DAXCBR) functions. The position information of the circuit breaker and the truck are connected to DAXCBR.

  • Page 55: Protection Functions

    Section 3 1MRS756785 G REM630 variants GUID-02640926-724F-4CFA-B189-F643DA17300B V1 EN Figure 17: Apparatus control 3.3.6 Protection functions 3.3.6.1 Stabilized three-phase differential protection MPDIF Stabilized three-phase differential protection with low stage (biased stage) and high stage (instantaneous stage) is used for protecting motor against winding failure. Two sets of three phase currents from the line side, 3I, and neutral side, 3I_N, are connected to the inputs I3P and I3P_N of MPDIF.

  • Page 56: Thermal Overload Protection Mpttr

    Section 3 1MRS756785 G REM630 variants disturbance recorder. An internal blocking signal available from the function INT_BLKD is connected to the disturbance recorder. GUID-CC6EA594-91F9-46CA-9E59-434E2680A9B0 V2 EN Figure 18: Motor load jam and differential protection 3.3.6.2 Thermal overload protection MPTTR The three-phase thermal overload protection function is designed to be used for protecting electric motors from overheating.

  • Page 57: Emergency Start Esmgapc

    Section 3 1MRS756785 G REM630 variants The thermal overload alarm and trip provide an LED indication on the LHMI. The thermal overload alarm, thermal overload trip and restart inhibit signals are connected to the disturbance recorders. 3.3.6.3 Emergency start ESMGAPC Emergency start function is used in an emergency where motor needs to be started even with a knowledge that it may result into damage to the motor.

  • Page 58: Loss Of Load Protection Loflptuc

    Section 3 1MRS756785 G REM630 variants 3.3.6.6 Loss of load protection LOFLPTUC The loss of load protection is used for detecting sudden load loss which is considered as a fault condition. The set of three phase currents, I3P, is connected to the inputs and the function operates when all the phase currents fall below the set level but stay above the set de- energization level.

  • Page 59: Non-Directional Overcurrent Protection Phxptoc

    Section 3 1MRS756785 G REM630 variants GUID-1769FB0F-68DC-47F1-BE9C-AD7D84B6115A V1 EN Figure 19: Motor negative-sequence overcurrent protection 3.3.6.9 Non-directional overcurrent protection PHxPTOC The three-phase non-directional overcurrent functions are used for non-directional one-phase, two-phase and three-phase overcurrent and short-circuit protection with definite time or various inverse definite minimum time (IDMT) characteristic. The operation of a stage is based on three measuring principles: DFT, RMS or peak-to- peak values.

  • Page 60: Non-Directional Earth-Fault Protection Efxptoc

    Section 3 1MRS756785 G REM630 variants 3.3.6.10 Non-directional earth-fault protection EFxPTOC The non-directional earth-fault protection functions are used for protection under earth-fault conditions with definite-time (DT) or with inverse definite minimum time (IDMT) characteristic when appropriate. The operation of the stage can be based on three measuring principles: DFT, RMS or peak-to-peak values.

  • Page 61: Circuit-Breaker Failure Protection Ccbrbrf

    Section 3 1MRS756785 G REM630 variants GUID-63612F53-F1C1-48E1-B940-DA878C64479A V1 EN Figure 20: Negative-sequence overvoltage protection 3.3.6.14 Circuit-breaker failure protection CCBRBRF The function is activated by the common operate command from the protection functions. The breaker failure function issues a backup trip command to adjacent circuit breakers in case the main circuit breaker fails to trip for the protected component.

  • Page 62: Combined Operate And Start Alarm Signal

    Section 3 1MRS756785 G REM630 variants Two master tripping signals are available at binary output PSM PO1 and PSM PO3. The lockout reset binary input available at COM BI10 is connected to the tripping circuit to reset the circuit-breaker lockout function. GUID-BAA37AD1-1B9D-4E4C-8A07-A77A737C0D84 V1 EN Figure 21: Tripping logic...

  • Page 63: Supervision Functions

    Section 3 1MRS756785 G REM630 variants 3.3.7 Supervision functions 3.3.7.1 Trip circuit supervision TCSSCBR Two instances of the trip circuit supervision function are used for supervising Master trip 1 and Master trip 2. Function continuously supervises trip circuit and alarms in case of a failure of a trip circuit.

  • Page 64: Measurement And Analog Recording Functions

    Section 3 1MRS756785 G REM630 variants GUID-AE19D082-7DE0-4F91-B634-388E154F13F9 V2 EN Figure 22: Circuit-breaker condition monitoring 3.3.8 Measurement and analog recording functions The measured quantities in this configuration are: • Current • Current sequence component • Residual current • Voltage • Power •...

  • Page 65: Binary Recording And Led Configuration

    Section 3 1MRS756785 G REM630 variants Table 15: Signals connected to the analog recorder Channel ID Description Channel 1 Line-side phase A current Channel 2 Line-side phase B current Channel 3 Line-side phase C current Channel 4 Neutral current Channel 5 Neutral-side phase A current Channel 6 Neutral-side phase B current...
  • Page 66 Section 3 1MRS756785 G REM630 variants functions are connected to a binary recorder. In case of a fault, the binary recorder is triggered which in turn will record all the signals connected to the recorder. Table 16: Signals connected to the binary recorder Channel ID Description Channel 1...
  • Page 67 Section 3 1MRS756785 G REM630 variants Channel ID Description Channel 37 Retrip from circuit-breaker failure protection Channel 38 Trip circuit alarm 1 (supervising motor stop circuit trip 1) Channel 39 Trip circuit alarm 2 (supervising motor stop circuit trip 2) Channel 40 Trip circuit alarm 3 (supervising motor start circuit ) Channel 41...
  • Page 68 Section 3 1MRS756785 G REM630 variants LED No LED color Description LED 9 Combine alarm from circuit breaker monitoring and trip circuit supervision function LED 10 Yellow Fuse failure supervision LED 10 Current circuit failure LED 11 Motor startup supervision LED 12 Motor stall at start LED 13...

  • Page 69: Section 4 Requirements For Measurement Transformers

    Section 4 1MRS756785 G Requirements for measurement transformers Section 4 Requirements for measurement transformers Current transformers 4.1.1 Current transformer requirements for overcurrent protection For reliable and correct operation of the overcurrent protection, the CT has to be chosen carefully. The distortion of the secondary current of a saturated CT may endanger the operation, selectivity, and co-ordination of protection.

  • Page 70: Non-Directional Overcurrent Protection

    Section 4 1MRS756785 G Requirements for measurement transformers of the CT is distorted and it might have severe effects on the performance of the protection relay. In practise, the actual accuracy limit factor (F ) differs from the rated accuracy limit factor (F ) and is proportional to the ratio of the rated CT burden and the actual CT burden.

  • Page 71: Example For Non-Directional Overcurrent Protection

    Section 4 1MRS756785 G Requirements for measurement transformers The adequate performance of the CT should be checked when the setting of the high set stage overcurrent protection is defined. The operate time delay caused by the CT saturation is typically small enough when the overcurrent setting is noticeably lower than F When defining the setting values for the low set stages, the saturation of the CT does not need to be taken into account and the start current setting is simply according to the...
  • Page 72 Section 4 1MRS756785 G Requirements for measurement transformers A071142 V1 EN Figure 24: Example of three-stage overcurrent protection The maximum three-phase fault current is 41.7 kA and the minimum three-phase short circuit current is 22.8 kA. The actual accuracy limit factor of the CT is calculated to be 59.

  • Page 73: Section 5 Glossary

    Section 5 1MRS756785 G Glossary Section 5 Glossary 100BASE-FX A physical medium defined in the IEEE 802.3 Ethernet standard for local area networks (LANs) that uses fiber optic cabling ANSI American National Standards Institute BI/O Binary input/output Binary input and output COMTRADE Common format for transient data exchange for power systems.
  • Page 74 Section 5 1MRS756785 G Glossary Local area network Connector type for glass fiber cable, IEC 61754-20 Light-emitting diode LHMI Local human-machine interface PCM600 Protection and Control IED Manager REM630 Motor protection and control IED RJ-45 Galvanic connector type Root-mean-square (value) Resistance temperature detector Software TCP/IP...
  • Page 76 — ABB Distribution Solutions Distribution Automation P.O. Box 699 FI-65101 VAASA, Finland Phone +358 10 22 11 www.abb.com/mediumvoltage www.abb.com/relion © Copyright 2019 ABB. All rights reserved.

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