Automatic switch onto fault logic ZCVPSOF................................76
Power swing detection ZMRPSB
(78)..........................................77
Power swing logic ZMRPSL.........................................................77
Current protection..............................................................................77
Breaker failure protection CCRBRF (50BF).................................77
Broken conductor check BRCPTOC (46).....................................77
Directional over-power protection GOPPDOP (32)......................77
Directional under-power protection GUPPDUP (37)....................78
Instantaneous phase overcurrent protection PHPIOC (50)..........78
Instantaneous residual overcurrent protection EFPIOC
(50N).............................................................................................78
Four step phase overcurrent protection OC4PTOC(51_67).........78
Pole discordance protection CCRPLD (52PD).............................78
Four step residual overcurrent protection EF4PTOC
(51N_67N)....................................................................................78
Sensitive directional residual over current and power
protection SDEPSDE (67N)..........................................................79
Stub protection STBPTOC (50STB).............................................79
Thermal overload protection, one time constant LPTTR
(26)...............................................................................................79
Voltage protection..............................................................................79
Loss of voltage check LOVPTUV (27)..........................................79
Overexcitation protection OEXPVPH (24)....................................79
Two step overvoltage protection OV2PTOV (59).........................80
Two step residual overvoltage protection ROV2PTOV
(59N).............................................................................................80
Two step undervoltage protection UV2PTUV (27).......................80
Voltage differential protection VDCPTOV (60).............................80
Frequency protection.........................................................................80
Overfrequency protection SAPTOF (81)......................................80
Rate-of-change frequency protection SAPFRC (81)....................81
Underfrequency protection SAPTUF (81).....................................81
Multipurpose protection.....................................................................81
General current and voltage protection CVGAPC........................81
Scheme communication....................................................................82
Scheme communication logic for distance or overcurrent
protection ZCPSCH (85)...............................................................82
Phase segregated Scheme communication logic for
distance protection ZC1PPSCH (85)............................................82
Current reversal and weak-end infeed logic for distance
protection ZCRWPSCH (85).........................................................82
Table of contents
8
Operator's manual
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