Table 152:VDCPTOV Group settings (advanced)Name Values (Range) Unit Step Default DescriptionRFL1 0.000 - 3.000 - 0.001 1.000 Ratio compensation factor phase L1U2L1*RFL1=U1L1RFL2 0.000 - 3.000 - 0.001 1.000 Ratio compensation factor phase L2U2L2*RFL2=U1L2RFL3 0.000 - 3.000 - 0.001 1.000 Ratio compensation factor phase L3U2L3*RFL3=U1L37.4.6 Technical dataTable 153:VDCPTOV technical dataFunction Range or value AccuracyVoltage difference for alarm andtrip(0.0–100.0) % ofUBase ± 0.5 % of UrUnder voltage level (0.0–100.0) % ofUBase ± 0.5% of UrTimers (0.000–60.000)s ± 0.5% ± 10 ms7.5 Loss of voltage check LOVPTUVFunction description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberLoss of voltage check LOVPTUV - 277.5.1 IntroductionLoss of voltage check (LOVPTUV) is suitable for use in networks with anautomatic system restoration function. LOVPTUV issues a three-pole tripcommand to the circuit breaker, if all three phase voltages fall below the set valuefor a time longer than the set time and the circuit breaker remains closed.7.5.2 Principle of operationThe operation of Loss of voltage check LOVPTUV is based on line voltagemeasurement. LOVPTUV is provided with a logic, which automatically recognisesif the line was restored for at least tRestore before starting the tTrip timer. All threephases are required to be low before the output TRIP is activated. The STARToutput signal indicates start.Additionally, LOVPTUV is automatically blocked if only one or two phasevoltages have been detected low for more than tBlock.Section 7 1MRK 505 208-UEN BVoltage protection252Technical reference manual
