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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 2015 ABB. All rights reserved
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
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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Line distance protection REL670 2.1 IEC 1
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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Line distance protection REL670 2.1 IEC 3
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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Line distance protection REL670 2.1 IEC 5
Commissioning manual
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
Table of contents
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
Table of contents
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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