Function Range or value AccuracyReset time 30 ms typically at 2 to 0 x Iset -Critical impulse time 10 ms typically at 0 to 2 x Iset -Operate time 10 ms typically at 0 to 5 x Iset -Reset time 40 ms typically at 5 to 0 x Iset -Critical impulse time 2 ms typically at 0 to 5 x Iset -Dynamic overreach < 5% at t = 100 ms -6.2 Four step phase overcurrent protection 3-phaseoutput OC4PTOC6.2.1 IdentificationFunction description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberFour step phase overcurrent protection3-phase outputOC4PTOC44 alt3I>TOC-REVA V1 EN51/676.2.2 FunctionalityThe four step phase overcurrent protection function, 3-phase output OC4PTOC has aninverse or definite time delay independent for step 1 and 4 separately. Step 2 and 3 arealways definite time delayed.All IEC and ANSI inverse time characteristics are available.The directional function is voltage polarized with memory. The function can be set tobe directional or non-directional independently for each of the steps.Second harmonic blocking level can be set for the function and can be used to blockeach step individually1MRK 511 287-UEN A Section 6Current protection81Technical manual
