5-26 G650 Generator Protection & Control System GEK-113285A
5.4 PROTECTION ELEMENTS 5 SETTINGS
5.4PROTECTION ELEMENTS 5.4.1 CHANGE OF SETTING TABLES IN G650 ELEMENTS
G650 relays incorporate the following protection elements:
CURRENT ELEMENTS
Instantaneous overcurrent:
3 x PHASE IOC HIGH (50PH)
3 x NEUTRAL IOC (50N)
3 x GROUND IOC (50G)
3 x SENSITIVE GROUND IOC (50SG) (Enhanced models only)
Time delayed overcurrent:
3 x PHASE TOC HIGH (51PH)
3 x PHASE TOC LOW (51PL)
3 x NEUTRAL TOC (51N)
3 x GROUND TOC (51G)
3 x SENSITIVE GROUND TOC (51SG) (Enhanced models only)
3 x RESTRICTED GROUND FAULT (87G) (Enhanced models only)
Negative sequence overcurrent:
3 x NEGATIVE SEQUENCE TOC (51-2)
3 x NEGATIVE SEQUENCE IOC (50-2)
3 x GENERATOR UNBALANCE (46)
Thermal image:
3 x THERMAL MODEL (49S)
DIRECTIONAL ELEMENTS
3 x NEUTRAL DIR (67N)
3 x GROUND DIR (67G)
VOLTAGE ELEMENTS
Phase under/overvoltage
3 x PHASE UV (27P)
3 x PHASE OV (59P)
Zero sequence overvoltage
3 x NEUTRAL OV HIGH (59NH)
Additional Ground overvoltage (For Vg selection in Auxiliary Voltage)
3 x GROUND OV (59G)
Additional auxiliary under/overvoltage (for VX selection in auxiliary voltage)
3 x AUXILIARY OV (59X)
3 x AUXILIARY UV (27X)
Negative sequence overvoltage:
3 x NEGATIVE SEQUENCE OV (47)
Volts per Hertz:
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