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

Underpower protectionANSI codefunction n°37PF551Equipmentc single-phase current and voltage generatorsc phase shifter with angle indicatorc ammetersc voltmeterc chronometerc calculatorc adapter for ECA modulec documentationWiringProcedurec protection parameter setting: Under/Pv set Ps set point to the desired valuev set T to the desired value (see curves in metering and protection functiondocumentation)v disable the following protections (1) :O/C; Unbalance; E/F (if sum of 3 CTs is used); Reverse Q; U U/V; U/current;N Vol Disp (if sum of 3 VTs is used)Qc diagram B5c protective relays:F551/1, F551/2 for real underpowerF551/3, F551/4 for reverse real power-Psreverseunderpowerunderpower+PsTestPc read the section entitled measurement and testingmethodThe real underpower protection may be tested byinjecting single-phase voltage and current,in accordance with diagram B5, into U21 and I1respectively.c status parameter settingEnter all data items:v Fn network frequencyv Unp network phase-to-phase voltagev Uns phase-to-phase voltage of the VT secondarycircuitsv number of VTs connected(set 1U for a single-phase testing)v select In CT primary valuev check and set the microswitches on the 3U/Vo,ECM and ECA modulesv choose the direction of power flow:feeder or incomerFeederreverseunderpowerunderpowerIncomerreverseunderpowerunderpower(1)remember to reactivate the protections at the end of testing.1/42Sepam 2000 - Testing