Siemens SIPROTEC 7SJ61

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Functions

2.7 Thermal Overload Protection 49

SIPROTEC, 7SJ61, Manual

C53000-G1140-C210-1, Release date 02.2008

127

Figure 2-40 Logic diagram of the overload protection

Main Page

Table of Contents9
Introduction17
Overall Operation18
Application Scope21
Characteristics23
Functions27
General28
Functions Overview28
Description28
Setting Notes29
Settings30
Device, General Settings32
Description32
Setting Notes32
Settings33
Information List33
Power System Data 135
Description35
Setting Notes35
Settings40
Information List41
Oscillographic Fault Records41
Description41
Setting Notes42
Settings43
Information List43
Settings Groups43
Description43
Setting Notes44
Settings44
Information List44
Power System Data 245
Description45
Setting Notes45
Settings46
Information List46
EN100-Module47
Functional Description47
Setting Notes47
Information List47
Overcurrent Protection 50, 51, 50N, 51N48
General48
Definite Time, High-Set Elements 50-3, 50-2, 50N-3, 50N-249
Definite Time Overcurrent Elements 50-1, 50N-152
Inverse Time Overcurrent Elements 51, 51N55
Dynamic Cold Load Pickup Function58
Inrush Restraint58
Pickup Logic and Tripping Logic61
Two-Phase Time Overcurrent Protection62
Fast Busbar Protection Using Reverse Interlocking62
Setting Notes63
Settings72
Information List75
Dynamic Cold Load Pickup77
Description77
Setting Notes80
Settings81
Information List82
Single-Phase Overcurrent Protection83
Functional Description83
High-Impedance Ground Fault Unit Protection85
Tank Leakage Protection87
Setting Notes88
Settings93
Information List93
Negative Sequence Protection 4694
Definite Time Characteristic94
Inverse Time Characteristic 46-TOC95
Setting Notes98
Settings101
Information List101
Motor Protection102
Motor Starting Protection 48102
Description102
Setting Notes105
Motor Restart Inhibit 66107
Description107
Setting Notes113
Load Jam Protection117
Mode of Operation117
Setting Notes120
Motorprotection (Motor Starting Protection 48, Motor Restart Inhibit 66, Loadjam)122
Settings122
Information List123
Thermal Overload Protection 49124
Description124
Setting Notes128
Settings133
Information List133
Monitoring Functions134
Measurement Supervision134
General134
Hardware Monitoring134
Software Monitoring136
Monitoring of the External Transformer Circuits137
Setting Notes138
Settings139
Information List139
Trip Circuit Supervision 74TC140
Description140
Setting Notes143
Settings144
Information List144
Malfunction Responses of the Monitoring Functions144
Description144
Ground Fault Protection 50N(S), 51N(S)147
Current Elements 50Ns, 51Ns147
Logic148
Setting Notes150
Settings154
Information List155
Intermittent Ground Fault Protection156
Description156
Setting Notes160
Settings161
Information List161
Automatic Reclosing System 79162
Program Execution162
Blocking167
Status Recognition and Monitoring of the Circuit Breaker168
Controlling Protection Elements170
Zone Sequencing (Not Available for Models 7SJ6***-**A**-)172
Setting Notes173
Settings180
Information List183
Breaker Failure Protection 50BF185
Description185
Setting Notes189
Settings190
Information List190
Flexible Protection Functions191
Function Description191
Setting Notes195
Settings198
Information List199
Temperature Detection Via RTD Boxes200
Description200
Setting Notes201
Settings203
Information List208
Phase Rotation209
Description209
Setting Notes210
Function Logic211
Pickup Logic of the Entire Device211
Tripping Logic of the Entire Device212
Setting Notes212
Auxiliary Functions213
Message Processing213
LED Displays and Binary Outputs (Output Relays)213
Information on the Integrated Display (LCD) or Personal Computer214
Information to a Substation Control Center215
Statistics216
Description216
Circuit Breaker Maintenance217
Motor Statistics223
Setting Notes224
Information List226
Measurement227
Display of Measured Values227
Transfer of Measured Values228
Information List229
Average Measurements230
Description230
Setting Notes230
Settings230
Information List231
Min/Max Measurement Setup231
Description231
Setting Notes231
Settings231
Information List232
Set Points for Measured Values232
Description233
Setting Notes233
Information List233
Set Points for Statistic234
Description234
Setting Notes234
Information List234
Commissioning Aids235
Description235
Web Monitor237
General237
Functions238
Operating Modes241
Display Example242
Setting Notes243
Breaker Control244
Control Device244
Description244
Information List245
Types of Commands246
Description246
Command Sequence247
Description247
System Interlocking248
Description248
Command Logging256
Description256
Mounting and Commissioning257
Mounting and Connections258
Configuration Information258
Hardware Modifications262
General262
Disassembly264
Switch Elements on the Pcbs266
Interface Modules276
Reassembly281
Installation282
Panel Flush Mounting282
Rack Mounting and Cubicle Mounting283
Panel Flush Mounting284
Checking Connections285
Checking Data Connections of Serial Interfaces285
Checking System Connections288
Commissioning290
Test Mode and Transmission Block291
Testing the System Interface291
Checking the Status of Binary Inputs and Outputs293
Tests for Circuit Breaker Failure Protection296
Testing User-Defined Functions297
Current and Phase Rotation Testing298
Test for High Impedance Protection298
Testing the Reverse Interlocking Scheme299
Checking the Temperature Measurement Via RTD-Box299
Trip/Close Tests for the Configured Operating Devices301
Creating Oscillographic Recordings for Tests302
Final Preparation of the Device303
Technical Data305
General Device Data306
Analog Inputs306
Auxiliary Voltage306
Binary Inputs and Outputs307
Communication Interfaces309
Electrical Tests313
Mechanical Stress Tests315
Climatic Stress Tests316
Service Conditions316
Certifications317
Design317
Definite-Time Overcurrent Protection 50(N)318
Inverse-Time Overcurrent Protection 51(N)320
Inrush Restraint331
Dynamic Cold Load Pickup332
Single-Phase Overcurrent Protection333
Negative Sequence Protection334
Negative Sequence Protection 46-TOC335
Motor Starting Protection 48341
Motor Restart Inhibit 66342
Load Jam Protection343
Thermal Overload Protection 49344
Ground Fault Protection 50N(S), 51N(S)346
Intermittent Ground Fault Protection350
Automatic Reclosing System 79351
Breaker Failure Protection 50BF352
Flexible Protection Functions353
Temperature Detection Via RTD Boxes355
User-Defined Functions (CFC)356
Additional Functions361
Breaker Control365
Dimensions366
Panel Flush and Cubicle Mounting (Housing Size 1 / 3 )366
Panel Surface Mounting (Housing Size )367
Varistor367
Appendix369
Ordering Information and Accessories370
Ordering Information370
7Sj61 V4.7370
Accessories373
Terminal Assignments376
Housing for Panel Flush and Cubicle Mounting376
Housing for Panel Surface Mounting379
Terminal Assignment on Housing for Panel Surface Mounting382
Assignment of the Female Connectors384
Connection Examples385
Connection Examples for Current Transformers, All Devices385
Connection Examples for RTD-Box, All Devices389
Current Transformer Requirements391
Accuracy Limiting Factors391
Effective and Rated Accuracy Limiting Factor391
Calculation Example According to IEC 60044-1391
Class Conversion392
Cable Core Balance Current Transformer393
General393
Requirements393
Class Accuracy393
Default Settings394
Leds394
Binary Input394
Binary Output395
Function Keys395
Default Display396
Pre-Defined CFC Charts397
Protocol-Dependent Functions399
Functional Scope400
Settings402
Information List415
Group Alarms433
Measured Values434
Literature437
Glossary439
Index451

Siemens SIPROTEC 7SJ61 - Page 127

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