The delay characteristics are described inTechnical manual. There are some restrictions regardingthe choice of the reset delay.For the definite time delay characteristics, the possible delay time setting instantaneous (1) andIEC (2 = set constant time reset).For ANSI inverse time characteristics, all three types of reset time characteristics are available:instantaneous (1), IEC (2 = set constant time reset) and ANSI (3 = current dependent reset time).For IEC inverse time characteristics, the possible delay time settings are instantaneous (1) and IEC(2 = set constant time reset).For the customer tailor-made inverse time delay characteristics (type 17), all three types of resettime characteristics are available: instantaneous (1), IEC (2 = set constant time reset) and ANSI (3 =current dependent reset time). If the current-dependent type is used, settingspr,tr andcr mustbe given.tResetx: Constant reset time delay in seconds for step x.tPCrvx,tACrvx,tBCrvx,tCCrvx: These parameters are used by the customer to create the inversetime characteristic curve. See equation 36 for the time characteristic equation. For moreinformation, refer toTechnical manual.[ ]>pAt s B MultPUxi Cin= + ×-æ öç ÷ç ÷ç ÷æ öç ÷ç ÷è øè øANSI-EQUATION1261 V1 EN-US (Equation 36)tPRCrvx,tTRCrvx,tCRCrvx: These parameters are used by the customer to create the inverse resettime characteristic curve. For more information, refer toTechnical manual.HarmRestrainx: Enables the block of stepx from the harmonic restrain function (2nd harmonic).This function should be used when there is a risk of an unwanted trip caused by powertransformer inrush currents. It can be set toDisabled/Enabled.8.2 Four step residual overcurrent protection, (Zerosequence or negative sequence directionality) EF4PTOC(51N/67N) IP14509-1 v68.2.1 IdentificationM14881-1 v5Function description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberFour step residual overcurrentprotectionEF4PTOC 4(IN>)4 alt4TEF-REVA V2 EN-US51N_67NSection 8 1MRK 511 364-UUS ACurrent protection114Application manual
