4–168 889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUALPROTECTION CHAPTER 4: SETPOINTSFigure 4-59: Phase Instantaneous Overcurrent logic diagram894034A2.cdrSETPOINTSPhase A current (Ia)RUNSETPOINTSFUNCTION:Disabled = 0TripPICKUP:DROPOUT DELAY:ANDPhase B current(Ib)Phase C current (Ic)RUNRUNOperate Output Relay 1 (TRIP)LED: PICKUPAlarmORORFrom Cold Load PickupFrom Autoreclose(per shot settings)Phase CurrentsANDLatched AlarmANDSETPOINTSBLOCKOff = 0ORIb > PICKUPIa > PICKUPIc > PICKUPSETPOINTSt PKPt PKPt PKPORORLED: ALARMRESETCommandANDSRLATCHConfigurablePhase IOC 1 OPPhase IOC 1 OP APhase IOC 1 OP BPhase IOC 1 OP CFlexLogic OperandsPhase IOC 1 PKPPhase IOC 1 PKP APhase IOC 1 PKP BPhase IOC 1 PKP CFlexLogic OperandsSETPOINTSOUTPUT RELAYSDo Not Operate, Operatet RSTt RSTt RSTPICKUP DELAY:LED: TRIPSetDominantPh A Reverse (from PhaseDirectional OC element)From Manual CloseBlockingSETPOINTSINPUT:Phasor, RMSSETPOINTSDIRECTION:DisabledForwardReverseORAND ANDPh B Reverse (from PhaseDirectional OC element)Ph C Reverse (from PhaseDirectional OC element)AND ANDSame Logic as for Phase ASame Logic as for Phase ACONFIGURABLE IN 845SETPOINTSSIGNAL INPUT:CT Bank 1 - J1USED ONLY IN 845/ 889USED ONLY IN 850
