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

Checking of protection disengaging timeThis time delay is activated on the falling edge of each fault signal. It processesvery brief transient faults which, when repetitive, allow T to be reached.The relay linked with the protection must not be a latching relay in order for thischeck to be performed.c parameter settingv set Tdis to the desired valuec testv set up the chronometer wiring so that it will start up when injection stops and thedropping out of the protective relay will stop the counting operationv create a fault by injecting current and voltagev reset the chronometer to zerov stop current or voltage injection and start up the chronometerv when the Sepam relay drops out, read the Tdis value on the chronometerChecking of the protection activation zone (sector)c parameter settingv set T to 0.05 sv select the sectorc testv inject voltage which corresponds to Vo > Vso (see section on N Vol Disp)v preset current Io to twice Iso, with a phase shift of 90° and then 270° with respectto Vov vary the phase shift angle a of the injection unit so as to determine the anglelimits of the activation zonesector normal zone inverse zone83° 97°…180°…263° 277°…0°…83°86° 94°…180°…266° 274°…0°…86°v reset to zero when leaving the zone each time the output relay is activated.Sepam 2000 - Testing1/17