ABB RED650 Applications Manual

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RELION® 650 SERIES
—
Line differential protection RED650
Version 2.2
Application manual
Document ID: 1MRK 505 393-UEN
Issued: March 2018
Revision: B
Product version: 2.2
© Copyright 2017 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.....................................................................17
This manual...................................................................................... 17
Presumptions for Technical Data................................................ 17
Intended audience............................................................................ 18
Product documentation.....................................................................18
Product documentation set..........................................................18
Document revision history........................................................... 20
Related documents......................................................................20
Document symbols and conventions................................................21
Symbols.......................................................................................21
Document conventions................................................................ 22
IEC 61850 edition 1 / edition 2 mapping...........................................22
Section 2 Application......................................................................27
General IED application....................................................................27
Main protection functions..................................................................28
Back-up protection functions............................................................ 29
Control and monitoring functions......................................................30
Communication.................................................................................33
Basic IED functions.......................................................................... 35
Section 3 Configuration..................................................................37
Description of configuration RED650............................................... 37
Introduction..................................................................................37
Description of A11.................................................................. 37
Section 4 Analog inputs..................................................................39
Introduction.......................................................................................39
Setting guidelines............................................................................. 39
Setting of the phase reference channel.......................................40
Example................................................................................. 40
Setting of current channels..........................................................40
Example 1.............................................................................. 40
Example 2.............................................................................. 41
Example 3.............................................................................. 42
Examples on how to connect, configure and set CT
inputs for most commonly used CT connections....................45
Example on how to connect a star connected three-
phase CT set to the IED......................................................... 46
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Application manual
Example how to connect delta connected three-phase
CT set to the IED....................................................................50
Example how to connect single-phase CT to the IED............ 53
Relationships between setting parameter Base Current, CT
rated primary current and minimum pickup of a protection IED.. 55
Setting of voltage channels......................................................... 55
Example................................................................................. 55
Examples how to connect, configure and set VT inputs
for most commonly used VT connections.............................. 56
Examples on how to connect a three phase-to-earth
connected VT to the IED........................................................ 57
Example on how to connect a phase-to-phase
connected VT to the IED........................................................ 59
Example on how to connect an open delta VT to the IED
for high impedance earthed or unearthed networks...............61
Example how to connect the open delta VT to the IED
for low impedance earthed or solidly earthed
power systems....................................................................... 64
Section 5 Local HMI....................................................................... 67
Display..............................................................................................68
LEDs.................................................................................................70
Keypad............................................................................................. 71
Local HMI functionality..................................................................... 73
Protection and alarm indication................................................... 73
Parameter management .............................................................74
Front communication................................................................... 75
Section 6 Differential protection..................................................... 77
Line differential protection................................................................ 77
Identification................................................................................ 77
Application................................................................................... 77
Power transformers in the protected zone............................. 78
Small power transformers in a tap..........................................79
Charging current compensation............................................. 80
Time synchronization............................................................. 82
Communication channels for line differential protection.........82
Configuration of analog signals.............................................. 84
Configuration of output signals...............................................85
Open CT detection................................................................. 85
Setting guidelines........................................................................ 86
General settings..................................................................... 86
Percentage restrained differential operation.......................... 87
The 2nd and 5th harmonic analysis....................................... 91
Internal/external fault discriminator........................................ 92
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Power transformers in the protected zone............................. 93
Settings examples.................................................................. 97
Section 7 Impedance protection...................................................107
Distance protection ZMFPDIS........................................................ 107
Identification.............................................................................. 107
Application................................................................................. 107
System earthing................................................................... 107
Fault infeed from remote end............................................... 111
Load encroachment..............................................................112
Short line application............................................................ 113
Long transmission line application....................................... 113
Parallel line application with mutual coupling....................... 114
Tapped line application........................................................ 120
Setting guidelines...................................................................... 122
General.................................................................................122
Setting of zone 1.................................................................. 123
Setting of overreaching zone................................................123
Setting of reverse zone........................................................ 124
Setting of zones for parallel line application......................... 124
Setting the reach with respect to load.................................. 126
Zone reach setting lower than minimum load impedance.... 127
Zone reach setting higher than minimum load impedance...129
Other settings....................................................................... 130
ZMMMXU settings................................................................133
Power swing detection ZMRPSB ...................................................134
Identification.............................................................................. 134
Application................................................................................. 134
General.................................................................................134
Basic characteristics.............................................................135
Setting guidelines...................................................................... 135
Automatic switch onto fault logic ZCVPSOF ................................. 143
Identification.............................................................................. 143
Application................................................................................. 143
Setting guidelines...................................................................... 144
Section 8 Current protection.........................................................147
Instantaneous phase overcurrent protection PHPIOC .................. 147
Identification.............................................................................. 147
Application................................................................................. 147
Setting guidelines...................................................................... 148
Meshed network without parallel line................................... 148
Meshed network with parallel line........................................ 150
Directional phase overcurrent protection, four steps OC4PTOC....152
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Identification.............................................................................. 152
Application................................................................................. 152
Setting guidelines...................................................................... 153
Settings for each step...........................................................155
Setting example....................................................................158
Instantaneous residual overcurrent protection EFPIOC ................ 163
Identification.............................................................................. 163
Application................................................................................. 163
Setting guidelines...................................................................... 163
Directional residual overcurrent protection, four steps EF4PTOC .166
Identification.............................................................................. 166
Application................................................................................. 166
Setting guidelines...................................................................... 168
Common settings for all steps.............................................. 169
2nd harmonic restrain...........................................................170
Parallel transformer inrush current logic...............................171
Switch onto fault logic...........................................................172
Settings for each step (x = 1, 2, 3 and 4)............................. 173
Line application example......................................................175
Thermal overload protection, one time constant, Celsius/
Fahrenheit LCPTTR/LFPTTR.........................................................180
Identification.............................................................................. 180
Application................................................................................. 180
Setting guideline........................................................................ 181
Breaker failure protection CCRBRF............................................... 182
Identification.............................................................................. 182
Application................................................................................. 182
Setting guidelines...................................................................... 183
Pole discordance protection CCPDSC........................................... 186
Identification.............................................................................. 187
Application................................................................................. 187
Setting guidelines...................................................................... 187
Section 9 Voltage protection........................................................ 189
Two step undervoltage protection UV2PTUV ................................189
Identification.............................................................................. 189
Application................................................................................. 189
Setting guidelines...................................................................... 190
Equipment protection, such as for motors and generators...190
Disconnected equipment detection...................................... 190
Power supply quality ........................................................... 190
Voltage instability mitigation................................................. 190
Backup protection for power system faults...........................190
Settings for two step undervoltage protection...................... 191
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Two step overvoltage protection OV2PTOV ..................................192
Identification.............................................................................. 192
Application................................................................................. 193
Setting guidelines...................................................................... 193
Equipment protection, such as for motors, generators,
reactors and transformers.................................................... 194
Equipment protection, capacitors......................................... 194
Power supply quality............................................................ 194
High impedance earthed systems........................................ 194
The following settings can be done for the two step
overvoltage protection.......................................................... 194
Two step residual overvoltage protection ROV2PTOV ................. 197
Identification.............................................................................. 197
Application................................................................................. 197
Setting guidelines...................................................................... 197
Equipment protection, such as for motors, generators,
reactors and transformersEquipment protection for
transformers......................................................................... 198
Equipment protection, capacitors......................................... 198
Power supply quality............................................................ 198
High impedance earthed systems........................................ 198
Direct earthed system.......................................................... 199
Settings for two step residual overvoltage protection...........200
Section 10 Frequency protection....................................................203
Underfrequency protection SAPTUF ............................................. 203
Identification.............................................................................. 203
Application................................................................................. 203
Setting guidelines...................................................................... 203
Overfrequency protection SAPTOF ...............................................204
Identification.............................................................................. 204
Application................................................................................. 205
Setting guidelines...................................................................... 205
Rate-of-change of frequency protection SAPFRC .........................206
Identification.............................................................................. 206
Application.................................................................................206
Setting guidelines...................................................................... 206
Section 11 Secondary system supervision.....................................209
Current circuit supervision CCSSPVC............................................209
Identification.............................................................................. 209
Application.................................................................................209
Setting guidelines...................................................................... 209
Fuse failure supervision FUFSPVC................................................210
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Identification.............................................................................. 210
Application................................................................................. 210
Setting guidelines...................................................................... 211
General.................................................................................211
Setting of common parameters............................................ 211
Negative sequence based....................................................212
Zero sequence based...........................................................213
Delta U and delta I ...............................................................213
Dead line detection...............................................................214
Section 12 Control..........................................................................215
Synchrocheck, energizing check, and synchronizing SESRSYN...215
Identification.............................................................................. 215
Application................................................................................. 215
Synchronizing.......................................................................215
Synchrocheck.......................................................................217
Energizing check.................................................................. 218
Voltage selection.................................................................. 219
External fuse failure..............................................................220
Application examples.................................................................221
Single circuit breaker with single busbar.............................. 222
Single circuit breaker with double busbar, external
voltage selection...................................................................223
Single circuit breaker with double busbar, internal
voltage selection...................................................................223
Setting guidelines...................................................................... 224
Autorecloser for 1 phase, 2 phase and/or 3 phase operation
SMBRREC .....................................................................................229
Identification.............................................................................. 229
Application................................................................................. 229
Auto reclosing operation Off and On.................................... 233
Start auto reclosing and conditions for start of a
reclosing cycle......................................................................233
Start auto reclosing from circuit breaker open information...234
Blocking of the auto recloser................................................ 234
Control of the auto reclosing dead time for shot 1................234
Long trip signal..................................................................... 235
Maximum number of reclosing shots....................................235
ARMode
=
3ph,
(normal setting for a three-phase shot)...... 235
ARMode
=
1/2/3ph
............................................................... 235
ARMode
=
1/2ph
, 1-phase or 2-phase reclosing in the
first shot................................................................................236
ARMode
= 1ph+1*2ph, 1-phase or 2-phase reclosing in
the first shot..........................................................................236
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ARMode = 1/2ph + 1*3ph, 1-phase, 2-phase or 3-phase
reclosing in the first shot.......................................................237
ARMode
= 1ph + 1*2/3ph, 1-phase, 2-phase or 3-phase
reclosing in the first shot.......................................................237
External selection of auto reclosing mode............................238
Auto reclosing reclaim timer................................................. 238
Pulsing of the circuit breaker closing command and
counter................................................................................. 238
Transient fault.......................................................................238
Permanent fault and reclosing unsuccessful signal............. 239
Lock-out initiation................................................................. 239
Evolving fault........................................................................ 240
Automatic continuation of the auto reclosing sequence....... 241
Thermal overload protection holding the auto recloser back241
Setting guidelines...................................................................... 241
Configuration........................................................................ 241
Auto recloser settings...........................................................247
Apparatus control........................................................................... 251
Application................................................................................. 251
Bay control QCBAY................................................................... 256
Switch controller SCSWI........................................................... 257
Switches SXCBR.......................................................................258
Proxy for signals from switching device via GOOSE
XLNPROXY............................................................................... 259
Interaction between modules.....................................................262
Setting guidelines...................................................................... 264
Bay control (QCBAY)........................................................... 265
Switch controller (SCSWI)....................................................265
Switch (SXCBR)................................................................... 266
Proxy for signals from switching device via GOOSE
XLNPROXY..........................................................................267
Logic rotating switch for function selection and LHMI
presentation SLGAPC.................................................................... 267
Identification.............................................................................. 267
Application................................................................................. 268
Setting guidelines...................................................................... 268
Selector mini switch VSGAPC........................................................269
Identification.............................................................................. 269
Application................................................................................. 269
Setting guidelines...................................................................... 269
Generic communication function for Double Point indication
DPGAPC........................................................................................ 270
Identification.............................................................................. 270
Application.................................................................................270
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Setting guidelines...................................................................... 271
Single point generic control 8 signals SPC8GAPC........................ 271
Identification.............................................................................. 271
Application................................................................................. 271
Setting guidelines...................................................................... 271
AutomationBits, command function for DNP3.0 AUTOBITS.......... 272
Identification.............................................................................. 272
Application................................................................................. 272
Setting guidelines...................................................................... 272
Single command, 16 signals SINGLECMD.................................... 273
Identification.............................................................................. 273
Application................................................................................. 273
Setting guidelines...................................................................... 275
Section 13 Scheme communication...............................................277
Scheme communication logic for distance or overcurrent
protection ZCPSCH........................................................................ 277
Identification.............................................................................. 277
Application................................................................................. 277
Blocking schemes................................................................ 278
Delta blocking scheme......................................................... 279
Permissive schemes............................................................ 280
Intertrip scheme....................................................................282
Setting guidelines...................................................................... 283
Blocking scheme.................................................................. 283
Delta blocking scheme......................................................... 283
Permissive underreaching scheme...................................... 284
Permissive overreaching scheme........................................ 284
Unblocking scheme.............................................................. 284
Intertrip scheme....................................................................284
Current reversal and Weak-end infeed logic for distance
protection 3-phase ZCRWPSCH ................................................... 285
Identification.............................................................................. 285
Application................................................................................. 285
Current reversal logic........................................................... 285
Weak-end infeed logic..........................................................286
Setting guidelines...................................................................... 287
Current reversal logic........................................................... 287
Weak-end infeed logic..........................................................287
Local acceleration logic ZCLCPSCH..............................................288
Identification.............................................................................. 288
Application................................................................................. 288
Setting guidelines...................................................................... 288
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Scheme communication logic for residual overcurrent
protection ECPSCH .......................................................................289
Identification.............................................................................. 289
Application................................................................................. 290
Setting guidelines...................................................................... 290
Current reversal and weak-end infeed logic for residual
overcurrent protection ECRWPSCH...............................................291
Identification.............................................................................. 291
Application................................................................................. 291
Fault current reversal logic................................................... 291
Weak-end infeed logic..........................................................292
Setting guidelines...................................................................... 293
Current reversal....................................................................293
Weak-end infeed.................................................................. 294
Section 14 Logic.............................................................................295
Tripping logic SMPPTRC ...............................................................295
Identification.............................................................................. 295
Application................................................................................. 295
Three-phase tripping............................................................ 296
Single- and/or three-phase tripping...................................... 296
Single-, two- or three-phase tripping.................................... 298
Lock-out................................................................................298
Example of directional data.................................................. 299
Blocking of the function block...............................................301
Setting guidelines...................................................................... 301
Trip matrix logic TMAGAPC........................................................... 301
Identification.............................................................................. 301
Application................................................................................. 302
Setting guidelines...................................................................... 302
Logic for group alarm ALMCALH....................................................302
Identification.............................................................................. 302
Application.................................................................................302
Setting guidelines...................................................................... 303
Logic for group alarm WRNCALH.................................................. 303
Identification.............................................................................. 303
Application............................................................................303
Setting guidelines................................................................. 303
Logic for group indication INDCALH...............................................303
Identification.............................................................................. 303
Application............................................................................303
Setting guidelines................................................................. 304
Configurable logic blocks................................................................304
Application.................................................................................304
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Application manual
Setting guidelines...................................................................... 304
Configuration........................................................................ 304
Fixed signal function block FXDSIGN............................................ 305
Identification.............................................................................. 305
Application................................................................................. 305
Boolean 16 to Integer conversion B16I.......................................... 306
Identification.............................................................................. 306
Application................................................................................. 307
Boolean to integer conversion with logical node
representation, 16 bit BTIGAPC..................................................... 308
Identification.............................................................................. 308
Application................................................................................. 308
Integer to Boolean 16 conversion IB16.......................................... 309
Identification.............................................................................. 309
Application................................................................................. 309
Integer to Boolean 16 conversion with logic node
representation ITBGAPC................................................................310
Identification.............................................................................. 310
Application................................................................................. 310
Elapsed time integrator with limit transgression and overflow
supervision TEIGAPC.....................................................................311
Identification.............................................................................. 311
Application................................................................................. 312
Setting guidelines...................................................................... 312
Comparator for integer inputs - INTCOMP..................................... 312
Identification.............................................................................. 312
Application................................................................................. 313
Setting guidelines...................................................................... 313
Setting example.........................................................................313
Comparator for real inputs - REALCOMP...................................... 314
Identification.............................................................................. 314
Application................................................................................. 314
Setting guidelines...................................................................... 314
Setting example.........................................................................315
Section 15 Monitoring.....................................................................317
Measurement..................................................................................317
Identification.............................................................................. 317
Application................................................................................. 317
Zero clamping............................................................................319
Setting guidelines...................................................................... 320
Setting examples..................................................................323
Gas medium supervision SSIMG................................................... 327
Identification.............................................................................. 327
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Application................................................................................. 327
Setting guidelines...................................................................... 328
Liquid medium supervision SSIML................................................. 329
Identification.............................................................................. 329
Application................................................................................. 329
Setting guidelines...................................................................... 329
Breaker monitoring SSCBR............................................................330
Identification.............................................................................. 330
Application................................................................................. 330
Setting guidelines...................................................................... 333
Setting procedure on the IED............................................... 333
Event function EVENT....................................................................334
Identification.............................................................................. 334
Application................................................................................. 335
Setting guidelines...................................................................... 335
Disturbance report DRPRDRE....................................................... 336
Identification.............................................................................. 336
Application................................................................................. 336
Setting guidelines...................................................................... 337
Recording times................................................................... 339
Binary input signals.............................................................. 340
Analog input signals............................................................. 341
Sub-function parameters...................................................... 341
Consideration....................................................................... 342
Logical signal status report BINSTATREP..................................... 343
Identification.............................................................................. 343
Application................................................................................. 343
Setting guidelines...................................................................... 344
Fault locator LMBRFLO..................................................................344
Identification.............................................................................. 344
Application.................................................................................344
Setting guidelines...................................................................... 345
Connection of analog currents............................................. 346
Limit counter L4UFCNT..................................................................347
Identification.............................................................................. 347
Application.................................................................................347
Setting guidelines...................................................................... 348
Running hour-meter TEILGAPC.....................................................348
Identification.............................................................................. 348
Application.................................................................................348
Setting guidelines...................................................................... 348
Section 16 Metering....................................................................... 351
Pulse-counter logic PCFCNT......................................................... 351
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Identification.............................................................................. 351
Application................................................................................. 351
Setting guidelines...................................................................... 351
Function for energy calculation and demand handling ETPMMTR 352
Identification.............................................................................. 352
Application................................................................................. 352
Setting guidelines...................................................................... 353
Section 17 Ethernet-based communication....................................355
Access point................................................................................... 355
Application................................................................................. 355
Setting guidelines...................................................................... 355
Redundant communication.............................................................356
Identification.............................................................................. 356
Application................................................................................. 357
Setting guidelines...................................................................... 358
Merging unit....................................................................................359
Application................................................................................. 359
Setting guidelines...................................................................... 360
Routes............................................................................................ 360
Application................................................................................. 360
Setting guidelines...................................................................... 360
Section 18 Station communication.................................................361
Communication protocols............................................................... 361
IEC 61850-8-1 communication protocol......................................... 361
Application IEC 61850-8-1.........................................................361
Setting guidelines...................................................................... 363
Horizontal communication via GOOSE..................................... 363
Sending data........................................................................ 363
Receiving data......................................................................364
IEC/UCA 61850-9-2LE communication protocol............................ 365
Introduction................................................................................365
Setting guidelines...................................................................... 367
Specific settings related to the IEC/UCA 61850-9-2LE
communication..................................................................... 368
Loss of communication when used with LDCM....................368
Setting examples for IEC/UCA 61850-9-2LE and time
synchronization.................................................................... 373
IEC 61850 quality expander QUALEXP.................................... 378
LON communication protocol......................................................... 379
Application................................................................................. 379
MULTICMDRCV and MULTICMDSND..................................... 380
Identification......................................................................... 381
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Application............................................................................381
Setting guidelines................................................................. 381
SPA communication protocol......................................................... 381
Application................................................................................. 381
Setting guidelines...................................................................... 382
IEC 60870-5-103 communication protocol..................................... 384
Application................................................................................. 384
Functionality......................................................................... 384
Design.................................................................................. 385
Settings......................................................................................387
Settings for RS485 and optical serial communication.......... 388
Settings from PCM600......................................................... 389
Function and information types................................................. 391
DNP3 Communication protocol...................................................... 392
Application................................................................................. 392
Section 19 Remote communication................................................393
Binary signal transfer......................................................................393
Identification.............................................................................. 393
Application................................................................................. 393
Communication hardware solutions..................................... 394
Setting guidelines...................................................................... 395
Section 20 Security........................................................................ 399
Authority status ATHSTAT............................................................. 399
Application................................................................................. 399
Self supervision with internal event list INTERRSIG...................... 399
Application................................................................................. 399
Change lock CHNGLCK................................................................. 400
Application................................................................................. 400
Denial of service SCHLCCH/RCHLCCH ....................................... 401
Application................................................................................. 401
Setting guidelines...................................................................... 401
Section 21 Basic IED functions...................................................... 403
IED identifiers TERMINALID.......................................................... 403
Application................................................................................. 403
Product information PRODINF....................................................... 403
Application.................................................................................403
Factory defined settings............................................................ 404
Measured value expander block RANGE_XP................................ 404
Identification.............................................................................. 405
Application.................................................................................405
Setting guidelines...................................................................... 405
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Parameter setting groups............................................................... 405
Application................................................................................. 405
Setting guidelines...................................................................... 406
Rated system frequency PRIMVAL................................................ 406
Identification.............................................................................. 406
Application................................................................................. 406
Setting guidelines...................................................................... 406
Summation block 3 phase 3PHSUM.............................................. 406
Application................................................................................. 407
Setting guidelines...................................................................... 407
Global base values GBASVAL....................................................... 407
Identification.............................................................................. 407
Application................................................................................. 407
Setting guidelines...................................................................... 408
Signal matrix for binary inputs SMBI.............................................. 408
Application................................................................................. 408
Setting guidelines...................................................................... 408
Signal matrix for binary outputs SMBO ......................................... 408
Application................................................................................. 409
Setting guidelines...................................................................... 409
Signal matrix for analog inputs SMAI............................................. 409
Application................................................................................. 409
Frequency values...................................................................... 409
Setting guidelines...................................................................... 410
Test mode functionality TESTMODE..............................................415
Application................................................................................. 415
IEC 61850 protocol test mode..............................................415
Setting guidelines...................................................................... 417
Time synchronization TIMESYNCHGEN........................................417
Application................................................................................. 417
Setting guidelines...................................................................... 418
System time..........................................................................418
Synchronization....................................................................418
Process bus IEC/UCA 61850-9-2LE synchronization.......... 421
Time synchronization for differential protection and
IEC/UCA 61850-9-2LE sampled data.................................. 421
Section 22 Requirements...............................................................423
Current transformer requirements.................................................. 423
Current transformer basic classification and requirements....... 423
Conditions..................................................................................425
Fault current.............................................................................. 426
Secondary wire resistance and additional load......................... 426
General current transformer requirements................................ 427
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