11.11.5.7 Single transformer............................................................................................................258
11.11.5.8 Parallel voltage regulation................................................................................................259
11.11.5.9 Completing the test.......................................................................................................... 262
11.11.6 Single command, 16 signals SINGLECMD...........................................................................262
11.11.7 Interlocking............................................................................................................................262
11.12 Scheme communication.......................................................................................................... 262
11.12.1 Scheme communication logic for distance or overcurrent protection ZCPSCH (85) ............262
11.12.1.1 Function revision history...................................................................................................263
11.12.1.2 Testing permissive underreaching....................................................................................263
11.12.1.3 Testing permissive overreaching......................................................................................263
11.12.1.4 Testing blocking scheme.................................................................................................. 264
11.12.1.5 Testing delta blocking scheme......................................................................................... 264
11.12.1.6 Checking of unblocking logic............................................................................................264
11.12.1.7 Completing the test.......................................................................................................... 265
11.12.2 Phase segregated scheme communication logic for distance or overcurrent protection
ZPCPSCH (85) .....................................................................................................................265
11.12.2.1 Function revision history...................................................................................................265
11.12.2.2 Testing permissive underreaching....................................................................................265
11.12.2.3 Testing permissive overreaching......................................................................................266
11.12.2.4 Testing blocking scheme.................................................................................................. 266
11.12.2.5 Completing the test.......................................................................................................... 266
11.12.3 Current reversal and Weak-end infeed logic for distance protection 3-phase
ZCRWPSCH (85).................................................................................................................. 266
11.12.3.1 Function revision history...................................................................................................267
11.12.3.2 Current reversal logic....................................................................................................... 267
11.12.3.3 Weak end infeed logic......................................................................................................268
11.12.3.4 Completing the test.......................................................................................................... 269
11.12.4 Scheme communication logic for residual overcurrent protection ECPSCH (85)................. 269
11.12.4.1 Function revision history...................................................................................................269
11.12.4.2 Testing the directional comparison logic function.............................................................269
11.12.4.3 Completing the test.......................................................................................................... 270
11.12.5 Current reversal and weak-end infeed logic for residual overcurrent protection
ECRWPSCH (85)..................................................................................................................271
11.12.5.1 Testing the current reversal logic......................................................................................271
11.12.5.2 Testing the weak-end infeed logic.................................................................................... 271
11.12.5.3 Completing the test.......................................................................................................... 272
11.13 Logic........................................................................................................................................273
11.13.1 Tripping logic, common 3-phase output SMPPTRC (94)...................................................... 273
11.13.1.1 Function revision history...................................................................................................273
11.13.1.2 3 phase operating mode...................................................................................................273
11.13.1.3 1p/3p operating mode ..................................................................................................... 273
11.13.1.4 1p/2p/3p operating mode ................................................................................................ 274
11.13.1.5 Circuit breaker lockout......................................................................................................275
Table of contents 1MRK 504 165-UUS Rev. J
10 Transformer protection RET670
Commissioning manual
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