40 100 40 40 220t ms ms ms ms msD ³ + + + =EQUATION1266 V1 EN-US (Equation 35)where it is considered that:the operation 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 Directional residual overcurrent protection, four stepsEF4PTOC (51N/67N) IP14509-1 v87.3.1 IdentificationM14881-1 v6Function description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberDirectional residual overcurrentprotection, four stepsEF4PTOC 4(IN>)4 alt4TEF-REVA V2 EN-US51N_67N7.3.2 Setting guidelines IP14988-1 v1M15282-3 v11When inverse time overcurrent characteristic is selected, the trip timeof the stage will be the sum of the inverse time delay and the setdefinite time delay. Thus, if only the inverse time delay is required, it isimportant to set the definite time delay for that stage to zero.The parameters for the four step residual overcurrent protection are set via the localHMI or PCM600. The following settings can be done for the function.Common base IED values for primary current (IBase), primary voltage (UBase) andprimary power (SBase) are set in the global base values for settings functionGBASVAL.GlobalBaseSel: This is used to select GBASVAL function for reference of base values.1MRK 505 370-UUS A Section 7Current protectionBusbar protection REB670 2.2 ANSI 197Application manual
