Table of contents
3WA1 air circuit breaker
6 Equipment Manual, 02/2023, 92310000002-06
2.9.2.1 Circuit breaker operating principle ..............................................................................................176
2.9.2.2 Test functions ..................................................................................................................................177
2.9.2.3 SENTRON powerconfig configuration software .......................................................................181
2.9.3 Display of errors and alarms ........................................................................................................181
2.9.4 Trip log ..............................................................................................................................................185
2.10 Zone-selective interlocking ZSI ...................................................................................................187
2.10.1 Advantage .........................................................................................................................................187
2.10.2 Structure and principle of operation of the ZSI system ..........................................................187
2.10.3 Monitoring and ZSI test function .................................................................................................189
2.10.4 Parameterization .............................................................................................................................189
2.10.5 Compatibility ....................................................................................................................................190
2.10.6 Application examples .....................................................................................................................191
2.10.6.1 Example: radial system with three grading levels ....................................................................191
2.10.6.2 Example of multiple infeed with coupler circuit breaker ........................................................194
2.10.6.3 Example of branch circuit with fuse............................................................................................195
2.10.6.4 Example of integrating the medium-voltage protection relay ...............................................198
3 Applications ...................................................................................................................................... 199
3.1 Use in systems with isolated transformer neutral point (IT systems).................................199
3.1.1 General ..............................................................................................................................................199
3.1.2 Selection criteria .............................................................................................................................200
3.1.3 Fault situation..................................................................................................................................201
3.2 Using the 3WA circuit breaker for motor protection................................................................202
3.3 Transfer control ...............................................................................................................................206
3.3.1 General ..............................................................................................................................................206
3.3.2 Transfer control with two 3WA circuit breakers .......................................................................
207
3.3.3 Transfer control with three 3WA circuit breakers ....................................................................207
3.3.4 Further information ........................................................................................................................207
3.4 Applications with closing coil and shunt trip ............................................................................208
3.4.1 Overview ...........................................................................................................................................208
3.4.2 Connecting the closing coil ...........................................................................................................210
3.4.3 Connection of the first shunt trip ................................................................................................211
3.4.4 Connection of the second shunt trip ..........................................................................................212
3.4.5 Electrical interlocks for switching via communication ............................................................212
3.4.6 Electrical closing interlock ............................................................................................................215
3.5 DSP800 display ...............................................................................................................................216
3.6 powermanager .................................................................................................................................219
3.6.1 Energy management in accordance with ISO 50001 ...............................................................219
3.6.2 Features ............................................................................................................................................220
3.6.3 Functions ..........................................................................................................................................221
3.6.4 TÜV certificate of conformity for energy management...........................................................221
3.7 7KN Powercenter 3000 ..................................................................................................................222
3.7.1 IoT gateway for the intelligent power distribution equipment ..............................................222
3.7.2 IoT data platform ............................................................................................................................223
3.7.3 Parameterization and settings .....................................................................................................224
3.8 SENTRON powermind....................................................................................................................225
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