ABB RET670 Commissioning Manual page 15

Transformer protection RET670 2.2 IEC
Commissioning manual
Completing the test.............................................................. 250
Phase segregated scheme communication logic for
distance or overcurrent protection ZC1PPSCH ........................250
Testing permissive underreaching....................................... 250
Testing permissive overreaching..........................................251
Testing blocking scheme......................................................251
Completing the test.............................................................. 251
Current reversal and Weak-end infeed logic for distance
protection 3-phase ZCRWPSCH .............................................. 252
Current reversal logic........................................................... 252
Weak end infeed logic.......................................................... 253
Completing the test.............................................................. 253
Scheme communication logic for residual overcurrent
protection ECPSCH ..................................................................254
Testing the directional comparison logic function.................254
Completing the test.............................................................. 255
Current reversal and weak-end infeed logic for residual
overcurrent protection ECRWPSCH .........................................255
Testing the current reversal logic......................................... 256
Testing the weak-end infeed logic........................................256
Completing the test.............................................................. 258
Logic............................................................................................... 258
Tripping logic, common 3-phase output SMPPTRC .................258
3 phase operating mode.......................................................258
1ph/3ph operating mode...................................................... 259
1ph/2ph/3ph operating mode............................................... 260
Circuit breaker lockout..........................................................261
Completing the test.............................................................. 261
Monitoring.......................................................................................262
Gas medium supervision SSIMG.............................................. 262
Testing the gas medium supervision for pressure alarm
and pressure lockout conditions...........................................262
Testing the gas medium supervision for temperature
alarm and temperature lock out conditions.......................... 263
Completing the test.............................................................. 263
Liquid medium supervision SSIML............................................ 263
Testing the liquid medium supervision for level alarm
and level lockout conditions................................................. 263
Testing the liquid medium supervision for temperature
alarm and temperature lock out conditions.......................... 264
Completing the test.............................................................. 264
Breaker monitoring SSCBR.......................................................264
Verifying the settings............................................................ 265
Completing the test.............................................................. 266
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