GE Multilin F60 Feeder Protection System 5-2275 SETTINGS 5.7 CONTROL ELEMENTS5Figure 5–116: BREAKER RESTRIKE SCHEME LOGICf) INCIPIENT FAULT DETECTORPATH: SETTINGS CONTROL ELEMENTS MONITORING ELEMENTS INCIPIENT FAULT 1(2)There are two incipient cable fault detection elements in the relay.Before a permanent cable fault occurs, there are usually signs of degrading insulation manifesting itself as a short, mostlyhalf-cycle spikes asserting at the phase voltage peak. Due to shortness of such spikes, they are not usually detected by theinstantaneous protection of the feeder, which operates on the RMS or fundamental component of the phase current with arelatively high pickup. INCIPIENT FAULT 1INCIPIENT FAULT 1FUNCTION: DisabledRange: Disabled, EnabledMESSAGE INCIPNT FLT 1 BLOCK:OffRange: FlexLogic™ operandMESSAGE INCIPIENT FAULT 1SOURCE: SRC 1Range: SRC 1, SRC 2, SRC 3, SRC 4MESSAGE INCIPIENT FAULT 1PICKUP: 0.50 puRange: 0.10 to 10.00 pu in steps of 0.01MESSAGE INCIPNT FLT 1 MODE:Number of countsRange: Number of counts, Counts per windowMESSAGE INCIPIENT FLT 1 TRIPCOUNTS NUMBER: 2Range: 1 to 10 in steps of 1MESSAGE INCIPNT FLT 1 DETECTWINDOW: 10.00 sRange: 0.00 to 1000.00 s in steps of 0.01MESSAGE INCIPIENT FAULT 1RESET DELAY: 0.100 sRange: 0.000 to 65.535 s in steps of 0.001MESSAGE INCIPIENT FAULT 1TARGET: Self-resetRange: Self-reset, Latched, DisabledMESSAGE INCIPIENT FAULT 1EVENTS: DisabledRange: Disabled, EnabledRUNCurrent interruptiondetection logic< 0.05 pufor > ¼ cycleItmagARMEDRESETSETTING= EnabledBREAKER RESTRIKE 1FUNCTIONSETTING= OffBKR RSTR 1 BLKANDSETTING= IABREAKER RESTRIKE 1SOURCE= IB= ICSETTING= OffBKR RSTR 1 BKR OPENSETTING= OffBKR RSTR 1 OPEN CMDSETTING= OffBKR RSTR 1 CLS CMDANDORSETTINGBREAKER RESTRIKE 1 PICKUPRUNRestrike detection logic0T RSTSETTINGBREAKER RESTRIKE 1RESET DELAY0T RST0T RSTFLEXLOGIC OPERANDSBKR RESTRIKE 1 OP ABKR RESTRIKE 1 OP BBKR RESTRIKE 1 OP CBKR RESTRIKE 1 OPFLEXLOGIC OPERANDOR834012A1.CDR
