Function Range or value AccuracyMinimum operatetime(0.000-60.000) s ± 0.2% or ± 45 ms whichever isgreaterOperate time, startat 0 to 2 x UsetMin. = 15 msMax. = 30 ms-Reset time, start at2 to 0 x UsetMin. = 15 msMax. = 30 ms-Operate time, startat 0 to 1.2 x UsetMin. = 20 msMax. = 35 ms-Reset time, start at1.2 to 0 x UsetMin. = 5 msMax. = 25 ms-Critical impulsetime10 ms typically at 0 to 2 x Uset -Impulse margintime15 ms typically -9.4 Overexcitation protection OEXPVPH9.4.1 IdentificationFunction description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberOverexcitation protection OEXPVPHU/f >SYMBOL-Q V1 EN249.4.2 FunctionalityWhen the laminated core of a power transformer or generator is subjected to amagnetic flux density beyond its design limits, stray flux will flow into non-laminatedcomponents that are not designed to carry flux. This will cause eddy currents to flow.These eddy currents can cause excessive heating and severe damage to insulation andadjacent parts in a relatively short time. The function has settable inverse operatingcurves and independent alarm stages.9.4.3 Function blockIEC05000329-2-en.vsdOEXPVPHI3P*U3P*BLOCKRESETTRIPSTARTALARMIEC05000329 V3 ENFigure 249: OEXPVPH function blockSection 9 1MRK502052-UEN BVoltage protection516Technical manual
