Scheme communication logic for distance or overcurrent
protection ZCPSCH........................................................................ 433
Identification.............................................................................. 433
Functionality.............................................................................. 433
Function block........................................................................... 433
Signals.......................................................................................434
Settings......................................................................................435
Operation principle.................................................................... 435
Blocking scheme.................................................................. 436
Delta blocking scheme......................................................... 436
Permissive underreaching scheme...................................... 437
Permissive overreaching scheme........................................ 438
Unblocking scheme.............................................................. 438
Intertrip scheme....................................................................439
Simplified logic diagram....................................................... 440
Technical data........................................................................... 441
Current reversal and Weak-end infeed logic for distance
protection 3-phase ZCRWPSCH ................................................... 441
Identification.............................................................................. 441
Functionality.............................................................................. 441
Function block........................................................................... 442
Signals.......................................................................................442
Settings......................................................................................443
Operation principle.................................................................... 443
Current reversal logic........................................................... 443
Weak-end infeed logic..........................................................444
Technical data........................................................................... 446
Local acceleration logic ZCLCPSCH..............................................446
Identification.............................................................................. 446
Functionality.............................................................................. 446
Function block........................................................................... 446
Signals.......................................................................................447
Settings......................................................................................447
Operation principle.................................................................... 448
Zone extension.....................................................................448
Loss-of-Load acceleration.................................................... 448
Scheme communication logic for residual overcurrent
protection ECPSCH .......................................................................449
Identification.............................................................................. 449
Functionality.............................................................................. 449
Function block........................................................................... 450
Signals.......................................................................................450
Settings......................................................................................451
Operation principle.................................................................... 451
Table of contents
12 Line distance protection REL650 2.2 IEC
Technical manual
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