Sepam - HV/MV Protection and control units (ENG) - Trinet

Directional earth fault protectionANSI code 67Nfunction n° F50X 1 ≤ X ≤ 2In order to use this function, it is necessary to befamiliar with the overcurrent and residual voltageprotection function procedures and settings(refer to appropriate sections).Equipmentc single-phase current and voltage generatorsc phase shifter with angle indicatorc ammetersc voltmeterc chronometerc calculatorc adapter for ECA modulec documentationWiringc B5 or B6 or B7 diagramc protective relays:F501/1, F501/2 for normal zone of set point 1F501/3, F501/4 for inverse zone of set point 1F502/1, F502/2 for normal zone of set point 2 (2)F502/3, F502/4 for inverse zone of set point 2 (2)Testc read the section entitled measurement and testingmethodc status parameter settingv select Fn network frequencyv set Unp phase-to-phase voltagev set Uns VT secondary circuit phase-to-phasevoltagev select Vo measurement methodv select CT primary valuev select Io measurement methodv check microswitches on the 3U/Vo, ECM orECA modules.Procedurec protection parameter setting: Dir. E/Fv set Iso to the desired valuev set T to the desired valuev select angle θo (characteristic angle)v disable the following protections (3) :- related to Vo if measurement is by the sum of the 3 VTs: U O/V; U O/V X; U U/V;U U/V X- related to Io if measurement is by the sum of the 3 CTs: all O/C, E/F andUnbalance set pointsv inject voltage which corresponds to Vo > 2.6 % of UnpChecking of set point with θo = 0°c parameter settingv set T to 0.05 sv select θo = 0°c test (see figure 1)v gradually inject current i with a phase shift of 180° with respect to Vo until theoutput relay linked with the normal protection zone in program logic picks upv read the current value on the ammeterv stop current injectionv press reset (1) on Sepam 2000 to erase the messages and reset the output relay.Checking of time delay Tc parameter settingv set T to the desired valuec test (see figure 1)v preset the current injection to 1.2 times the Iso value and the 180° phase shiftwith respect to Vov set the chronometer to zerov start up injection and the chronometer at the same timev Sepam's 2000 output relay stops the chronometerv read the value measured by the chronometerChecking of the protection range using a phase shifterc parameter settingv set T to the minimum (0.05 s)v set Isoc test (see figures 2, 3 and 4)v set the injection current i to a value that is clearly greater than Iso so that itsprojection Ipo will be greater than Isov the angle limits of the normal and inverse ranges will be:- normal zone[ϕo] = 180° + θo ±ω- inverse zone[ϕo] = 360° + θo ±ωwith cosω = Iso/iθo = angle of the line formed by the projection of i with respect to Vo(set via the pocket terminal).(1)this function may only be activated if your program logichas been customized(2)only one relay is used in standard applications(3)remember to reactivate the protections at the end of the test.X = number of the protective relay.1/14 Sepam 2000 - Testing