ABB RET670 - Page 15

Check the overcurrent block function......................................... 251
Single transformer...................................................................... 252
Parallel voltage regulation.......................................................... 253
Completing the test.....................................................................258
Single command, 16 signals SINGLECMD..................................... 258
Interlocking...................................................................................... 258
Scheme communication....................................................................... 258
Scheme communication logic for distance or overcurrent
protection ZCPSCH (85)..................................................................258
Testing permissive underreaching..............................................259
Testing permissive overreaching................................................259
Testing blocking scheme............................................................ 259
Testing delta blocking scheme................................................... 260
Checking of unblocking logic...................................................... 261
Completing the test.....................................................................261
Phase segregated scheme communication logic for distance or
overcurrent protection ZC1PPSCH (85).......................................... 261
Testing permissive underreaching..............................................261
Testing permissive overreaching................................................262
Testing blocking scheme............................................................ 262
Completing the test.....................................................................263
Current reversal and Weak-end infeed logic for distance
protection 3-phase ZCRWPSCH (85)..............................................263
Current reversal logic................................................................. 263
Weak end infeed logic................................................................ 264
Completing the test.....................................................................265
Scheme communication logic for residual overcurrent protection
ECPSCH (85).................................................................................. 265
Testing the directional comparison logic function.......................265
Completing the test.....................................................................267
Current reversal and weak-end infeed logic for residual
overcurrent protection ECRWPSCH (85)........................................ 267
Testing the current reversal logic............................................... 267
Testing the weak-end infeed logic.............................................. 268
Completing the test.....................................................................270
Logic..................................................................................................... 270
Tripping logic, common 3-phase output SMPPTRC (94)................ 270
3 phase operating mode.............................................................270
1p/3p operating mode.................................................................271
1p/2p/3p operating mode............................................................271
Circuit breaker lockout................................................................272
Table of contents
Transformer protection RET670 2.2 ANSI 9
Commissioning manual