8.2.1 IdentificationFunction description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberFour step phase overcurrent protection3-phase outputOC4PTOCTOC-REVA V2 EN51/678.2.2 FunctionalityThe four step three-phase overcurrent protection function OC4PTOC has an inverseor definite time delay independent for step 1 to 4 separately.All IEC and ANSI inverse time characteristics are available together with an optionaluser defined time characteristic.The directional function needs voltage as it is voltage polarized with memory. Thefunction can be set to be directional or non-directional independently for each of thesteps.Second harmonic blocking level can be set for the function and can be used to blockeach step individuallySection 8 1MRK502052-UEN BCurrent protection336Technical manual
