IEC09000979-4-en.vsdBFP Started L1 tt2ANDORBFP Started L2BFP Started L3From otherphasesOR ORAND tt2MPhCBFLT ANDANDab a>bININ>1 out of 4ANDOR1 out of 3Current High L2Current High L3From otherphases ANDCurrent High L1ORContact Closed L1ORBackup Trip L1tPulseBackup Trip L2ORFrom otherphases Backup Trip L3TRBUORSR SRQANDtt3tPulseTRBU2OR2 out of 4BUTripMode1 ANDORCurrent high L1BFP Started L130msANDBackup Time Out L1IEC09000979 V4 EN-USFigure 97: Simplified logic scheme of the back-up trip logic functionThe internal logical signals Current High L1, Current High L2, Current High L3have logical value 1 when the current in the respective phase has the magnitudelarger than the setting parameter IP>.8.6.8 Technical data IP10269-1 v1M12353-1 v13Table 108:CCRBRF technical dataFunction Range or value AccuracyOperate phase current (5-200)% oflBase ±1.0% of Ir at I £ Ir±1.0% of I at I > IrReset ratio, phase current > 95% -Operate residual current (2-200)% oflBase ±1.0% of Ir at I £ Ir±1.0% of I at I > IrReset ratio, residual current > 95% -Phase current level for blocking of contactfunction(5-200)% oflBase ±1.0% of Ir at I £ Ir±1.0% of I at I > IrReset ratio > 95% -Operate time for current detection 10 ms typically -Reset time for current detection 15 ms maximum -Table continues on next pageSection 8 1MRK 505 394-UEN ACurrent protection218 Line differential protection RED650 2.2 IECTechnical manual
