8.1.9 Technical dataTable 89:OC4PTOC (51/67) technical dataFunction Setting range AccuracyOperate current (5-2500)% oflBase ± 1.0% of In at I ≤ In± 1.0% of I at I > InReset ratio > 95% at (50–2500)% oflBase -Min. operating current (5-10000)% oflBase ± 1.0% of In at I ≤ In±1.0% of I at I > In2nd harmonic blocking (5–100)% of fundamental ± 2.0% of InIndependent time delay (0.000-60.000) s ± 0.5% ±25 msMinimum operate time forinverse characteristics(0.000-60.000) s ± 0.5% ±25 msInverse characteristics, seetable 574, table 575 and table57615 curve types 1) ANSI/IEEE C37.112IEC 60255–151±3% or ±40 ms0.10 ≤ k ≤ 3.001.5 x Iset ≤ I ≤ 20 x IsetOperate time, nondirectionalpickup function25 ms typically at 0 to 2 x Iset -Reset time, pickup function 35 ms typically at 2 to 0 x Iset -Operate time, directional pickupfunction50 ms typically at 0 to 2 x Iset -Reset time, directional pickupfunction35 ms typically at 2 to 0 x Iset -Critical impulse time 10 ms typically at 0 to 2 x Iset -Impulse margin time 15 ms typically -1) Note: Timing accuracy only valid when 2nd harmonic blocking is turned off8.2 Four step residual overcurrent protection, zero,negative sequence direction EF4PTOC (51N/67N)8.2.1 IdentificationFunction description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberFour step residual overcurrentprotection, zero or negative sequencedirectionEF4PTOC2IEC11000263 V1 EN51N/67N1MRK 502 048-UUS A Section 8Current protection203Technical manual
