ABB REC670 Applications Manual page 18

Table of contents
12
Section 15 Scheme communication.................................................... 465
Scheme communication logic for distance or overcurrent
protection ZCPSCH(85)........................................................................465
Identification.................................................................................... 465
Application....................................................................................... 465
Blocking schemes.......................................................................466
Delta blocking scheme............................................................... 467
Permissive schemes...................................................................468
Intertrip scheme..........................................................................472
Setting guidelines............................................................................ 472
Blocking scheme........................................................................ 472
Delta blocking scheme............................................................... 473
Permissive underreaching scheme............................................ 473
Permissive overreaching scheme...............................................473
Unblocking scheme.................................................................... 473
Intertrip scheme..........................................................................474
Current reversal and Weak-end infeed logic for distance protection
3-phase ZCRWPSCH (85)....................................................................474
Identification.................................................................................... 474
Application....................................................................................... 474
Current reversal logic................................................................. 474
Weak-end infeed logic................................................................ 475
Setting guidelines............................................................................ 476
Current reversal logic................................................................. 476
Weak-end infeed logic................................................................ 477
Local acceleration logic ZCLCPSCH.................................................... 477
Identification.................................................................................... 477
Application....................................................................................... 477
Setting guidelines............................................................................ 478
Scheme communication logic for residual overcurrent protection
ECPSCH (85)....................................................................................... 479
Identification.................................................................................... 479
Application....................................................................................... 479
Setting guidelines............................................................................ 480
Current reversal and weak-end infeed logic for residual
overcurrent protection ECRWPSCH (85)............................................. 481
Identification.................................................................................... 481
Application....................................................................................... 481
Fault current reversal logic......................................................... 481
Weak-end infeed logic................................................................ 482
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