Setting guidelines............................................................................ 460
Scheme communication and tripping for faults occurring
during power swinging over the protected line
...........................
460
Blocking and tripping logic for evolving power swings................465
Pole slip protection PSPPPAM (78)......................................................466
Identification.................................................................................... 466
Application....................................................................................... 467
Setting guidelines............................................................................ 469
Setting example for line application............................................471
Setting example for generator application.................................. 476
Out-of-step protection OOSPPAM (78)................................................ 481
Identification.................................................................................... 481
Application....................................................................................... 481
Setting guidelines............................................................................ 484
Automatic switch onto fault logic ZCVPSOF ........................................488
Identification.................................................................................... 488
Application....................................................................................... 488
Setting guidelines............................................................................ 489
Phase preference logic PPLPHIZ......................................................... 490
Identification.................................................................................... 490
Application....................................................................................... 491
Setting guidelines............................................................................ 494
Phase preference logic PPL2PHIZ....................................................... 495
Identification.................................................................................... 495
Application....................................................................................... 496
Setting guidelines............................................................................ 499
Under impedance protection for generators and transformers
ZGVPDIS.............................................................................................. 501
Identification.................................................................................... 501
Application....................................................................................... 501
Operating zones......................................................................... 503
Zone 1 operation........................................................................ 504
Zone 2 operation........................................................................ 504
Zone 3 operation........................................................................ 505
CT and VT positions................................................................... 506
Undervoltage seal-in function..................................................... 506
Load encroachment for zone 2 and zone 3................................ 506
External block signals.................................................................507
Setting Guidelines........................................................................... 508
General.......................................................................................508
Table of contents
10 Transformer protection RET670 2.2 ANSI
Application manual
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