40 100 40 40 220t ms ms ms ms msD ³ + + + =EQUATION1266 V1 EN-US (Equation 25)where it is considered that:the operate time of overcurrent protection B1 is 40 msthe breaker open time is 100 msthe resetting time of protection A1 is 40 ms andthe additional margin is 40 ms7.3 Instantaneous residual overcurrent protectionEFPIOC IP14508-1 v37.3.1 IdentificationM14887-1 v4Function description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberInstantaneous residual overcurrentprotectionEFPIOCIN>>IEF V1 EN-US50N7.3.2 Application M12699-3 v5In many applications, when fault current is limited to a defined value by the objectimpedance, an instantaneous earth-fault protection can provide fast and selectivetripping.The Instantaneous residual overcurrent EFPIOC, which can operate in 15 ms (50Hz nominal system frequency) for faults characterized by very high currents, isincluded in the IED.7.3.3 Setting guidelines IP14985-1 v1M12762-44 v2M12762-4 v4The parameters for the Instantaneous residual overcurrent protection EFPIOC areset via the local HMI or PCM600.Some guidelines for the choice of setting parameter for EFPIOC is given.M12762-6 v8Common base IED values for primary current (IBase), primary voltage (UBase)and primary power (SBase) are set in the global base values for settings functionGBASVAL.1MRK 504 169-UEN A Section 7Current protectionTransformer protection RET650 2.2 IEC 117Application manual
