ABB RET 670 - Page 10

Voltage communication...............................................................58
Frequency protection...................................................................58
Multipurpose protection...............................................................58
Secondary system protection......................................................58
Control.........................................................................................58
Logic............................................................................................58
Function status.................................................................................59
Overview......................................................................................59
View differential protection values...............................................59
Transformer differential protection, two winding (PDIF,
87T) .......................................................................................59
Transformer differential protection, three winding (PDIF,
87T) .......................................................................................59
Restricted earth fault protection (PDIF, 87N).........................59
High impedance differential protection (PDIF, 87X)...............60
Distance protection .....................................................................60
Phase selection with load encroachment (PDIS, 21).............60
Distance protection zones (PDIS, 21)....................................60
Power swing detection (RPSB, 78)........................................60
Automatic switch onto fault logic (PSOF)...............................60
Current protection........................................................................60
Instantaneous phase overcurrent protection (PIOC, 50)........61
Four step phase overcurrent protection (POCM, 51/67)........61
Four step single phase overcurrent protection (POCM,
51)..........................................................................................61
Instantaneous residual overcurrent protection (PIOC,
50N)........................................................................................61
Four step residual overcurrent protection (PEFM, 51N/
67N)........................................................................................61
Thermal overload protection, two time constants (PTTR,
49) .........................................................................................61
Breaker failure protection (RBRF, 50BF)...............................61
Breaker failure protection, single phase version (RBRF,
50BF) .....................................................................................62
Pole discordance protection (RPLD, 52PD)...........................62
Voltage protection........................................................................62
Two step undervoltage protection (PUVM, 27)......................62
Two step overvoltage protection (POVM, 59)........................62
Two step residual overvoltage protection (POVM, 59N)........62
Overexcitation protection (PVPH, 24)....................................62
View frequency protection values................................................63
Underfrequency protection (PTUF, 81)..................................63
Overfrequency protection (PTOF, 81)....................................63
Rate-of-change frequency protection (PFRC, 81)..................63
Table of contents
6 Operator's manual
1MRK504049-UEN rev. D
RET 670