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

Underfrequency protectionANSI code81Lfunction n° F56X 1 ≤ X ≤ 4Equipmentc single-phase voltage generator with frequencyvariatorc voltmeterc chronometerc documentationWiringc diagram B3c protective relays:F561/1, F561/2, F561/3F562/1, F562/2, F562/3Testc read the section entitled measurement and testingmethodSince the different underfrequency protections aresingle-phase, the tests may be performed by usinga single-phase injection unit on the U21 voltage inputand disabling the other set points(by setting them to 999 kV).c status parameter settingv select Fn network frequency (50 or 60 Hz)v set Unp network phase-to-phase voltagev select the number of connected VTsv select Uns VT secondary circuit phase-to-phasevoltageProcedurec protection parameter setting: UNDER/F X; UNDER/Fv set Fs to the desired valuev disable the other underfrequency protection set points (Fs = 999 Hz)v disable the U U/V or U U/V X set points (2)Testing of set pointc parameter settingv set T to 0.1sc testv inject a voltage of at least 35% Uns and frequency Fn into U21v gradually reduce the frequency injected into U21 until the Sepam 2000 relaylinked to the protection picks upv read the value on the frequency indicatorv increase the frequency to Fn or cut off the voltagev press reset (1) on Sepam 2000 to erase the message and reset the output relay.Testing of time delayc parameter settingv set T to the desired valuec testv preset voltage (Uns) and frequency below the set point Fsv stop injectionv 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 t value measured by the chronometer(1)this function may only be activated if your program logic hasbeen customized.(2)remember to reactivate the protections at the end of testing.X = number of the protective relay.Sepam 2000 - Testing 1/39