CHAPTER 4: SETPOINTS PROTECTION889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–265Figure 4-105: Overfrequency Protection logic diagramLED: PICKUPSETPOINTSBLOCK :Off=0ANDSETPOINTSOVERFREQ 1FUNCTION :DisabledAlarmLatched AlarmConfigurableORVoltage InputsNoneSETPOINTSOVERFREQ 1PICKUP :f ≥ PICKUPRUNSETPOINTSOVERFREQ 1PICKUP DELAY :t PKPt DPOOVERFREQ 1DROPOUT DELAY :Overfreq1 OPFlexLogic OperandsOverfreq1 PKPAND ANDCommandRESETORLED: ALARMSETPOINTSOVERFREQ 1MINIMUM OPERATINGVOLTAGE :V ≥ MINIMUMFREQUENCY fRUNSETPOINTSRELAYSDo Not Operate , OperateSLATCHSet-DominantRTripANDLED: TRIPOperate Output Relay 1 (TRIP)WYE DELTAVA VABVB VBCVC VCAVxSETPOINTSOVERFREQ 1SIGNAL INPUT :Positive -sequenceComposite894055A2.cdr
