ABB RED650 Applications Manual

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

This document and parts thereof must not be reproduced or copied without written

permission from ABB, and the contents thereof must not be imparted to a third

party, nor used for any unauthorized purpose.

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

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

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

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

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

([email protected]).

Trademarks

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

product names mentioned in this document may be trademarks or registered

trademarks of their respective holders.

Warranty

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

Disclaimer

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

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

properties. All persons responsible for applying the equipment addressed in this

manual must satisfy themselves that each intended application is suitable and

acceptable, including that any applicable safety or other operational requirements

are complied with. In particular, any risks in applications where a system failure

and/or product failure would create a risk for harm to property or persons

(including but not limited to personal injuries or death) shall be the sole

responsibility of the person or entity applying the equipment, and those so

responsible are hereby requested to ensure that all measures are taken to exclude or

mitigate such risks.

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

completely ruled out. In case any errors are detected, the reader is kindly requested

to notify the manufacturer. Other than under explicit contractual commitments, in

no event shall ABB be responsible or liable for any loss or damage resulting from

the use of this manual or the application of the equipment.

Conformity

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

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

electromagnetic compatibility (EMC Directive 2004/108/EC) and concerning

electrical equipment for use within specified voltage limits (Low-voltage directive

2006/95/EC). This conformity is the result of tests conducted by ABB in

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

with the product standards EN 60255-1 and EN 60255-27 for the low voltage

directive. The product is designed in accordance with the international standards of

the IEC 60255 series.

Table of contents

Section 1 Introduction.....................................................................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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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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Line differential protection RED650 2.2 IEC 11

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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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12 Line differential protection RED650 2.2 IEC

Application manual

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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Line differential protection RED650 2.2 IEC 13

Application manual

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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14 Line differential protection RED650 2.2 IEC

Application manual

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