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

Phase-to-phase overvoltage protectionANSI code 59function n° F28X for U32 overvoltage protection 1≤ X ≤ 2F30X for U21 overvoltage protectionEquipmentc single-phase or three-phase voltage generatorc voltmetersc chronometerc calculatorc documentationWiringc diagram B3 or B4c protective relays:F281/1, F281/2, F282/1, F282/2 (2) for U32 voltageF301/1, F301/2, F302/1, F302/2 for U21 voltageTestc read the section entitled measurement and testingmethodc status parameter settingv select Fn network frequency (50 or 60 Hz)v set Unp network phase-to-phase voltagev set Uns VT secondary circuit phase-to-phasevoltagev select the number of connected VTsProcedurec protection parameters:U 21 O/V, U21 O/V X, U32 O/V, U32 O/V X (2)v set Us to the desired valuev set T to the desired valuev disable the lowest protection set point (3)Testing of set pointc protection parameters settings:v set T to 0.05 s to obtain the shortest output relay response timec testv inject voltage Uns into U21v gradually increase U21 voltage until the output relay picks upv read the voltage value on the voltmeter and on the Sepam 2000 display unitv stop injectionv press reset (1) on Sepam 2000 to erase the messages and reset the output relayTesting of time delay Tc protection parameter settings:v set T to the desired valuec testv prepare the injection with 1.2 times the value of Usv set the chronometer to zerov start injection and the chronometer at the same timev Sepam's 2000 output relay stops the chronometerv read the value measured by the chronometer(1)this function may only be activated if your program logichas been customized.(2)this function is not used in standard applications (checkingof U21 is sufficient).(3)remember to reactivate the protections at the end of testing.X = number of the protective relay.Sepam 2000 - Testing 1/35