ABB Relion 670 Series REL670 Commissioning Manual

Relion

®

670 series

Line distance protection REL670 2.1 IEC

Commissioning manual

Document ID: 1MRK 506 355-UEN

Issued: February 2016

Revision: A

Product version: 2.1

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 and hardware described in this document is furnished under a license and

may be used or disclosed only in accordance with the terms of such license.

This product includes software developed by the OpenSSL Project for use in the

OpenSSL Toolkit. (http://www.openssl.org/) This product includes cryptographic

software written/developed by: Eric Young ([email protected]) and Tim Hudson

([email protected]).

Trademarks

ABB and Relion are registered trademarks of the ABB Group. All other brand or

product names mentioned in this document may be trademarks or registered

trademarks of their respective holders.

Warranty

Please inquire about the terms of warranty from your nearest ABB representative.

Disclaimer

The data, examples and diagrams in this manual are included solely for the concept or

product description and are not to be deemed as a statement of guaranteed properties.

All persons responsible for applying the equipment addressed in this manual must

satisfy themselves that each intended application is suitable and acceptable, including

that any applicable safety or other operational requirements are complied with. In

particular, any risks in applications where a system failure and/or product failure

would create a risk for harm to property or persons (including but not limited to

personal injuries or death) shall be the sole responsibility of the person or entity

applying the equipment, and those so responsible are hereby requested to ensure that

all measures are taken to exclude or mitigate such risks.

This document has been carefully checked by ABB but deviations cannot be

completely ruled out. 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.

Conformity

This product complies with the directive of the Council of the European Communities

on the approximation of the laws of the Member States relating to electromagnetic

compatibility (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

standard EN 60255-26 for the EMC directive, and with the product standards EN

60255-1 and EN 60255-27 for the low voltage directive. The product is designed in

accordance with the international standards of the IEC 60255 series.

Table of contents

Section 1 Introduction.....................................................................11

This manual...................................................................................... 11

Intended audience............................................................................ 11

Product documentation.....................................................................12

Product documentation set..........................................................12

Document revision history........................................................... 13

Related documents......................................................................14

Document symbols and conventions................................................14

Symbols.......................................................................................14

Document conventions................................................................ 15

IEC61850 edition 1 / edition 2 mapping............................................16

Section 2 Safety information.......................................................... 25

Symbols on the product....................................................................25

Warnings.......................................................................................... 25

Caution signs....................................................................................27

Note signs.........................................................................................27

Section 3 Available functions......................................................... 29

Main protection functions..................................................................29

Back-up protection functions............................................................ 31

Control and monitoring functions......................................................32

Communication.................................................................................38

Basic IED functions.......................................................................... 41

Section 4 Starting up......................................................................43

Factory and site acceptance testing................................................. 43

Commissioning checklist.................................................................. 43

Checking the power supply.............................................................. 44

Energizing the IED............................................................................44

Checking the IED operation.........................................................44

IED start-up sequence.................................................................45

Setting up communication between PCM600 and the IED...............45

Writing an application configuration to the IED.................................50

Checking CT circuits.........................................................................51

Checking VT circuits.........................................................................52

Using the RTXP test switch.............................................................. 52

Checking the binary I/O circuits........................................................53

Binary input circuits..................................................................... 53

Binary output circuits................................................................... 53

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Commissioning manual

Checking optical connections........................................................... 53

Section 5 Configuring the IED and changing settings....................55

Overview...........................................................................................55

Configuring analog CT inputs........................................................... 56

Reconfiguring the IED...................................................................... 56

Section 6 Establishing connection and verifying the SPA/IEC

communication............................................................... 59

Entering settings...............................................................................59

Entering SPA settings..................................................................59

Entering IEC settings...................................................................59

Verifying the communication............................................................ 60

Verifying SPA communication..................................................... 60

Verifying IEC communication...................................................... 60

Fibre optic loop................................................................................. 61

Optical budget calculation for serial communication with SPA/IEC .61

Section 7 Establishing connection and verifying the LON

communication............................................................... 63

Communication via the rear ports ....................................................63

LON communication.................................................................... 63

The LON Protocol........................................................................64

Hardware and software modules.................................................64

Optical budget calculation for serial communication with LON ........66

Section 8 Establishing connection and verifying the IEC 61850

communication............................................................... 67

Overview...........................................................................................67

Setting the station communication....................................................67

Verifying the communication............................................................ 68

Section 9 Testing IED operation.....................................................69

Preparing for test.............................................................................. 69

Requirements.............................................................................. 69

Preparing the IED to verify settings............................................. 71

Activating the test mode................................................................... 72

Preparing the connection to the test equipment............................... 72

Connecting the test equipment to the IED........................................73

Releasing the function to be tested.................................................. 74

Verifying analog primary and secondary measurement................... 75

Testing the protection functionality................................................... 76

Forcing of binary I/O signals for testing............................................ 77

Forcing concept........................................................................... 77

How to enable forcing..................................................................77

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2 Line distance protection REL670 2.1 IEC

Commissioning manual

Enable forcing by using LHMI................................................ 77

Enable forcing using TESTMODE function block...................78

How to change binary input/output signals using forcing............ 78

Forcing by using LHMI........................................................... 78

Forcing by using PCM600...................................................... 80

How to undo forcing changes and return the IED to normal

operation......................................................................................82

Undo forcing by using TestMode component.........................82

Undo forcing by using LHMI................................................... 82

Undo forcing by using PCM600..............................................82

Section 10 Testing functionality by secondary injection...................85

Testing disturbance report................................................................85

Introduction..................................................................................85

Disturbance report settings..........................................................85

Disturbance recorder (DR).......................................................... 85

Event recorder (ER) and Event list (EL)...................................... 86

Identifying the function to test in the technical reference manual ....87

Differential protection........................................................................87

High impedance differential protection HZPDIF ......................... 87

Verifying the settings.............................................................. 87

Completing the test................................................................ 88

Additional security logic for differential protection LDRGFC .......88

Verifying the settings.............................................................. 88

Completing the test................................................................ 90

Impedance protection....................................................................... 90

Distance protection zones, quadrilateral characteristic

ZMQPDIS.................................................................................... 90

Measuring the operating limit of set values............................ 93

Measuring the operating time of distance protection zones... 94

Completing the test................................................................ 94

Phase selection with load encroachment, quadrilateral

characteristic FDPSPDIS ........................................................... 94

Measuring the operating limit of set values............................ 97

Completing the test................................................................ 97

Full scheme distance protection, mho characteristic ZMHPDIS..97

Phase-to-phase faults............................................................ 98

Phase-to-earth faults.............................................................. 99

Faulty phase identification with load encroachment

FMPSPDIS ............................................................................... 100

Distance protection zones, quadrilateral characteristic,

separate settings ZMRPDIS...................................................... 100

Measuring the operating limit of set values.......................... 103

Measuring the operating time of distance protection zones. 104

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Commissioning manual

Phase selection, quadrilateral characteristic with settable

angle FRPSPDIS.......................................................................104

Measuring the operating limit of set values.......................... 106

Completing the test.............................................................. 107

High speed distance protection zones, quadrilateral and mho

characteristic ZMFPDIS.............................................................107

Measuring the operating limit of set values.......................... 111

Measuring the operating time of distance protection zones. 111

Completing the test.............................................................. 112

High Speed distance for series compensated line zones,

quadrilateral and mho characteristic ZMFCPDIS...................... 112

Measuring the operating limit of set values.......................... 115

Measuring the operating time of distance protection zones. 116

Completing the test.............................................................. 116

Power swing detection ZMRPSB ..............................................116

Verifying the settings............................................................ 118

Testing the power swing detection function ZMRPSB ........ 118

Testing the

tR1

timer............................................................ 118

Testing the block input, interaction between FDPSPDIS

or FRPSPDIS and ZMRPSB ............................................... 119

Completing the test.............................................................. 119

Power swing logic PSLPSCH.................................................... 119

Testing the carrier send and trip signals.............................. 120

Testing the influence of the residual overcurrent protection.120

Checking the underreaching zone........................................121

Completing the test.............................................................. 121

Pole slip protection PSPPPAM..................................................121

Verifying the settings............................................................ 122

Completing the test.............................................................. 124

Out-of-step protection OOSPPAM.............................................124

Verifying the settings............................................................ 125

Test of point RE (R

FwdR

, X

FwdX

)........................................... 129

Test of the boundary between zone 1 and zone 2, which is

defined by the parameter

ReachZ1

......................................133

Test of the point SE (R

RvsR

, X

RvsX

)...................................... 137

Automatic switch onto fault logic ZCVPSOF............................. 142

Activating ZCVPSOF externally........................................... 142

Initiating ZCVPSOF automatically and setting mode to

impedance............................................................................143

Initiating ZCVPSOF automatically and setting mode to

UILevel ................................................................................ 143

Completing the test.............................................................. 143

Phase preference logic PPLPHIZ .............................................143

Completing the test.............................................................. 144

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4 Line distance protection REL670 2.1 IEC

Commissioning manual

Current protection...........................................................................145

Instantaneous phase overcurrent protection 3-phase output

PHPIOC ....................................................................................145

Measuring the operate limit of set values.............................145

Completing the test.............................................................. 145

Four step phase overcurrent protection 3-phase output

OC4PTOC................................................................................. 145

Verifying the settings............................................................ 146

Completing the test.............................................................. 147

Instantaneous residual overcurrent protection EFPIOC ........... 147

Measuring the operate limit of set values.............................147

Completing the test.............................................................. 147

Four step residual overcurrent protection, (Zero sequence or

negative sequence directionality) EF4PTOC ............................148

Four step directional earth fault protection........................... 148

Four step non-directional earth fault protection....................148

Completing the test.............................................................. 149

Four step negative sequence overcurrent protection

NS4PTOC .................................................................................149

Completing the test.............................................................. 150

Sensitive directional residual overcurrent and power

protection SDEPSDE ................................................................150

Measuring the operate and time limit for set values.............150

Completing the test.............................................................. 156

Thermal overload protection, one time constant, Celsius/

Fahrenheit LCPTTR/LFPTTR....................................................156

Measuring the operate and time limit of set values.............. 156

Completing the test.............................................................. 157

Breaker failure protection, phase segregated activation and

output CCRBRF.........................................................................157

Checking the phase current operate value,

IP>

................... 157

Checking the residual (earth fault) current operate value

IN>

set below

IP>

................................................................. 158

Checking the re-trip and back-up times................................158

Verifying the re-trip mode..................................................... 158

Verifying the back-up trip mode............................................159

Verifying instantaneous back-up trip at CB faulty condition. 160

Verifying the case

RetripMode

=

Contact

.............................160

Verifying the function mode

Current&Contact

...................... 161

Completing the test.............................................................. 161

Stub protection STBPTOC........................................................ 161

Measuring the operate limit of set values.............................162

Completing the test.............................................................. 162

Pole discordance protection CCPDSC...................................... 162

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Verifying the settings............................................................ 162

Completing the test.............................................................. 163

Directional underpower protection GUPPDUP ......................... 163

Verifying the settings............................................................ 164

Completing the test.............................................................. 165

Directional overpower protection GOPPDOP ...........................165

Verifying the settings............................................................ 165

Completing the test.............................................................. 166

Broken conductor check BRCPTOC ........................................ 166

Measuring the operate and time limit of set values.............. 166

Completing the test.............................................................. 167

Voltage-restrained time overcurrent protection VRPVOC......... 167

Verifying the settings............................................................ 167

Completing the test.............................................................. 170

Voltage protection...........................................................................171

Two step undervoltage protection UV2PTUV ...........................171

Verifying the settings............................................................ 171

Completing the test.............................................................. 172

Two step overvoltage protection OV2PTOV .............................172

Verifying the settings............................................................ 172

Extended testing...................................................................173

Completing the test.............................................................. 173

Two step residual overvoltage protection ROV2PTOV ............ 173

Verifying the settings............................................................ 173

Completing the test.............................................................. 174

Overexcitation protection OEXPVPH ....................................... 174

Verifying the settings............................................................ 174

Completing the test.............................................................. 175

Voltage differential protection VDCPTOV .................................175

Check of undervoltage levels............................................... 175

Check of voltage differential trip and alarm levels................177

Check of trip and trip reset timers........................................ 178

Final adjustment of compensation for VT ratio differences . 179

Completing the test.............................................................. 179

Loss of voltage check LOVPTUV ............................................. 179

Measuring the operate limit of set values.............................179

Completing the test.............................................................. 180

Radial feeder protection PAPGAPC.......................................... 180

Verifying the settings............................................................ 180

Completing the test.............................................................. 182

Frequency protection......................................................................182

Underfrequency protection SAPTUF ........................................ 182

Verifying the settings............................................................ 182

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6 Line distance protection REL670 2.1 IEC

Commissioning manual

Completing the test.............................................................. 183

Overfrequency protection SAPTOF ..........................................183

Verifying the settings............................................................ 183

Completing the test.............................................................. 184

Rate-of-change frequency protection SAPFRC ........................184

Verifying the settings............................................................ 184

Completing the test.............................................................. 185

Multipurpose protection.................................................................. 185

General current and voltage protection CVGAPC..................... 185

Built-in overcurrent feature (non-directional)........................ 186

Overcurrent feature with current restraint.............................186

Overcurrent feature with voltage restraint............................ 187

Overcurrent feature with directionality..................................187

Over/Undervoltage feature................................................... 188

Completing the test.............................................................. 188

Secondary system supervision.......................................................188

Current circuit supervision CCSSPVC.......................................188

Verifying the settings............................................................ 188

Completing the test.............................................................. 189

Fuse failure supervision FUFSPVC...........................................189

Checking that the binary inputs and outputs operate as

expected ..............................................................................189

Measuring the operate value for the negative sequence

function ................................................................................190

Measuring the operate value for the zero-sequence

function ................................................................................191

Measuring the operate value for the dead line detection

function.................................................................................192

Checking the operation of the du/dt and di/dt based function 192

Completing the test.............................................................. 193

Fuse failure supervision VDSPVC.............................................193

Completing the test.............................................................. 194

Control............................................................................................ 194

Synchrocheck, energizing check, and synchronizing

SESRSYN................................................................................. 194

Testing the synchronizing function....................................... 196

Testing the synchrocheck check.......................................... 197

Testing the energizing check................................................199

Testing the voltage selection................................................201

Completing the test.............................................................. 203

Autorecloser for 1/2/3-phase operation SMBRREC ................. 203

Preparation of the verification ..............................................205

Switching the autorecloser for 1/2/3-phase operation

function to

On

and

Off

.......................................................... 206

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Line distance protection REL670 2.1 IEC 7

Commissioning manual

Verifying the autorecloser function SMBRREC ................... 206

Checking the reclosing conditions .......................................207

Completing the test.............................................................. 209

Apparatus control APC.............................................................. 209

Single command, 16 signals SINGLECMD............................... 209

Interlocking................................................................................ 210

Scheme communication................................................................. 210

Scheme communication logic for distance or overcurrent

protection ZCPSCH .................................................................. 210

Testing permissive underreaching....................................... 210

Testing permissive overreaching..........................................211

Testing blocking scheme......................................................211

Testing delta blocking scheme............................................. 212

Checking of unblocking logic................................................212

Completing the test.............................................................. 212

Phase segregated scheme communication logic for distance

or overcurrent protection ZC1PPSCH ...................................... 213

Testing permissive underreaching....................................... 213

Testing permissive overreaching..........................................213

Testing blocking scheme......................................................214

Completing the test.............................................................. 214

Current reversal and Weak-end infeed logic for distance

protection 3-phase ZCRWPSCH .............................................. 214

Current reversal logic........................................................... 215

Weak end infeed logic.......................................................... 215

Completing the test.............................................................. 216

Local acceleration logic ZCLCPSCH.........................................216

Verifying the settings............................................................ 216

Completing the test.............................................................. 217

Scheme communication logic for residual overcurrent

protection ECPSCH ..................................................................217

Testing the directional comparison logic function.................217

Completing the test.............................................................. 219

Current reversal and weak-end infeed logic for residual

overcurrent protection ECRWPSCH .........................................219

Testing the current reversal logic......................................... 219

Testing the weak-end infeed logic........................................219

Completing the test.............................................................. 221

Direct transfer trip logic..............................................................221

Low active power and power factor local criteria

LAPPGAPC.......................................................................... 221

Compensated over- and undervoltage protection

COUVGAPC.........................................................................222

Sudden change in current variation SCCVPTOC.................223

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8 Line distance protection REL670 2.1 IEC

Commissioning manual

Carrier receive logic LCCRPTRC ........................................224

Negative sequence overvoltage protection LCNSPTOV......225

Zero sequence overvoltage protection LCZSPTOV............. 226

Negative sequence overcurrent protection LCNSPTOC...... 227

Zero sequence overcurrent protection LCZSPTOC............. 228

Three phase overcurrent LCP3PTOC.................................. 228

Three phase undercurrent LCP3PTUC................................ 229

Logic............................................................................................... 230

Tripping logic, common 3-phase output SMPPTRC .................230

Three-phase operating mode............................................... 230

1ph/3ph operating mode...................................................... 230

1ph/2ph/3ph operating mode............................................... 231

Circuit breaker lockout..........................................................232

Completing the test.............................................................. 233

Monitoring.......................................................................................233

Gas medium supervision SSIMG.............................................. 233

Testing the liquid medium supervision for alarm and lock

out conditions....................................................................... 233

Completing the test.............................................................. 234

Liquid medium supervision SSIML............................................ 234

Testing the liquid medium supervision for alarm and lock

out conditions....................................................................... 234

Completing the test.............................................................. 234

Breaker monitoring SSCBR.......................................................235

Verifying the settings............................................................ 235

Completing the test.............................................................. 237

Event function EVENT...............................................................237

Fault locator LMBRFLO.............................................................237

Measuring the operate limit.................................................. 238

Completing the test.............................................................. 239

Limit counter L4UFCNT.............................................................239

Completing the test.............................................................. 239

Metering..........................................................................................239

Pulse-counter logic PCFCNT.................................................... 239

Function for energy calculation and demand handling

ETPMMTR.................................................................................239

Verifying the settings............................................................ 240

Completing the test.............................................................. 241

Station communication................................................................... 241

Multiple command and transmit MULTICMDRCV /

MULTICMDSND........................................................................ 241

Remote communication..................................................................241

Binary signal transfer BinSignReceive, BinSignTransm............241

Basic IED functions........................................................................ 243

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Line distance protection REL670 2.1 IEC 9

Commissioning manual

Parameter setting group handling SETGRPS........................... 243

Verifying the settings............................................................ 243

Completing the test.............................................................. 244

Exit test mode.................................................................................244

Section 11 Checking the directionality........................................... 245

Overview.........................................................................................245

Testing the directionality of the distance protection........................245

Section 12 Commissioning and maintenance of the fault

clearing system............................................................ 249

Commissioning tests...................................................................... 249

Periodic maintenance tests............................................................ 249

Visual inspection........................................................................250

Maintenance tests..................................................................... 250

Preparation...........................................................................250

Recording............................................................................. 251

Secondary injection.............................................................. 251

Alarm test............................................................................. 251

Self supervision check..........................................................251

Trip circuit check.................................................................. 251

Measurement of service currents......................................... 252

Restoring.............................................................................. 253

Section 13 Glossary....................................................................... 255

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10 Line distance protection REL670 2.1 IEC

Commissioning manual

Section 1 Introduction

1.1 This manual

The commissioning manual contains instructions on how to commission the IED. The

manual can also be used by system engineers and maintenance personnel for

assistance during the testing phase. The manual provides procedures for the checking

of external circuitry and energizing the IED, parameter setting and configuration as

well as verifying settings by secondary injection. The manual describes the process of

testing an IED in a substation which is not in service. The chapters are organized in the

chronological order in which the IED should be commissioned. The relevant

procedures may be followed also during the service and maintenance activities.

1.2 Intended audience

This manual addresses the personnel responsible for commissioning, maintenance

and taking the IED in and out of normal service.

The commissioning personnel must have a basic knowledge of handling electronic

equipment. The commissioning and maintenance personnel must be well experienced

in using protection equipment, test equipment, protection functions and the

configured functional logics in the IED.

1MRK 506 355-UEN A Section 1

Introduction

Line distance protection REL670 2.1 IEC 11

Commissioning manual

1.3 Product documentation

1.3.1 Product documentation set

IEC07000220-4-en.vsd

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Application manual

Operation manual

Installation manual

Engineering manual

Communication

protocol manual

Cyber security

deployment guideline

Technical manual

Commissioning manual

IEC07000220 V4 EN

Figure 1: The intended use of manuals throughout the product lifecycle

The engineering manual contains instructions on how to engineer the IEDs using the

various tools available within the PCM600 software. The manual provides

instructions on how to set up a PCM600 project and insert IEDs to the project

structure. The manual also recommends a sequence for the engineering of protection

and control functions, LHMI functions as well as communication engineering for IEC

60870-5-103, IEC 61850, DNP3, LON and SPA.

The installation manual contains instructions on how to install the IED. The manual

provides procedures for mechanical and electrical installation. The chapters are

organized in the chronological order in which the IED should be installed.

The commissioning manual contains instructions on how to commission the IED. The

manual can also be used by system engineers and maintenance personnel for

assistance during the testing phase. The manual provides procedures for the checking

of external circuitry and energizing the IED, parameter setting and configuration as

Section 1 1MRK 506 355-UEN A

Introduction

12 Line distance protection REL670 2.1 IEC

Commissioning manual

well as verifying settings by secondary injection. The manual describes the process of

testing an IED in a substation which is not in service. The chapters are organized in the

chronological order in which the IED should be commissioned. The relevant

procedures may be followed also during the service and maintenance activities.

The operation manual contains instructions on how to operate the IED once it has been

commissioned. The manual provides instructions for the monitoring, controlling and

setting of the IED. The manual also describes how to identify disturbances and how to

view calculated and measured power grid data to determine the cause of a fault.

The application manual contains application descriptions and setting guidelines

sorted per function. The manual can be used to find out when and for what purpose a

typical protection function can be used. The manual can also provide assistance for

calculating settings.

The technical manual contains operation principle descriptions, and lists function

blocks, logic diagrams, input and output signals, setting parameters and technical

data, sorted per function. The manual can be used as a technical reference during the

engineering phase, installation and commissioning phase, and during normal service.

The communication protocol manual describes the communication protocols

supported by the IED. The manual concentrates on the vendor-specific

implementations.

The point list manual describes the outlook and properties of the data points specific

to the IED. The manual should be used in conjunction with the corresponding

communication protocol manual.

The cyber security deployment guideline describes the process for handling cyber

security when communicating with the IED. Certification, Authorization with role

based access control, and product engineering for cyber security related events are

described and sorted by function. The guideline can be used as a technical reference

during the engineering phase, installation and commissioning phase, and during

normal service.

1.3.2 Document revision history

Document revision/date

History

December 2015 First release

A/February 2016 Minor updates

1MRK 506 355-UEN A Section 1

Introduction

Line distance protection REL670 2.1 IEC 13

Commissioning manual

1.3.3 Related documents

Documents related to REL670 Document numbers

Application manual 1MRK 506 353-UEN

Commissioning manual 1MRK 506 355-UEN

Product guide 1MRK 506 356-BEN

Technical manual 1MRK 506 354-UEN

Type test certificate 1MRK 506 356-TEN

670 series manuals Document numbers

Operation manual 1MRK 500 123-UEN

Engineering manual 1MRK 511 355-UEN

Installation manual 1MRK 514 024-UEN

Communication protocol manual, DNP3 1MRK 511 348-UUS

Communication protocol manual, IEC

60870-5-103

1MRK 511 351-UEN

Communication protocol manual, IEC 61850

Edition 1

1MRK 511 349-UEN

Communication protocol manual, IEC 61850

Edition 2

1MRK 511 350-UEN

Communication protocol manual, LON 1MRK 511 352-UEN

Communication protocol manual, SPA 1MRK 511 353-UEN

Point list manual, DNP3 1MRK 511 354-UUS

Accessories guide 1MRK 514 012-BEN

Cyber security deployment guideline 1MRK 511 356-UEN

Connection and Installation components 1MRK 513 003-BEN

Test system, COMBITEST 1MRK 512 001-BEN

1.4 Document symbols and conventions

1.4.1 Symbols

The electrical warning icon indicates the presence of a hazard which

could result in electrical shock.

The warning icon indicates the presence of a hazard which could

result in personal injury.

Section 1 1MRK 506 355-UEN A

Introduction

14 Line distance protection REL670 2.1 IEC

Commissioning manual

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