8.4.8 Technical dataTable 107:TRPTTR technical dataFunction Range or value AccuracyBase current 1 and 2 (30–250)% ofIBase ± 1.0% of IrOperate time:2 22 2prefI It ln I It æ ö-ç ÷= × ç ÷-è øEQUATION1356 V2 EN (Equation 63)I = actual measured currentIp = load current before overloadoccursIref = reference load currentIp = load current before overloadoccursTime constant τ = (1–500)minutesIEC 60255–8, ±5% + 200 msAlarm level 1 and 2 (50–99)% of heat content tripvalue± 2.0% of heat content tripOperate current (50–250)% ofIBase ± 1.0% of IrReset level temperature (10–95)% of heat content trip ± 2.0% of heat content trip8.5 Breaker failure protection 3-phase activation andoutput CCRBRF8.5.1 IdentificationFunction description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberBreaker failure protection, 3-phaseactivation and outputCCRBRF3I>BFSYMBOL-U V1 EN50BF8.5.2 FunctionalityCCRBRF can be current based, contact based, or an adaptive combination of these twoconditions.Breaker failure protection, 3-phase activation and output (CCRBRF) ensures fastback-up tripping of surrounding breakers in case the own breaker fails to open.CCRBRF can be current based, contact based, or an adaptive combination of these twoconditions.Current check with extremely short reset time is used as check criterion to achievehigh security against inadvertent operation.1MRK 502 048-UEN A Section 8Current protection221Technical manual
