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

Directional overcurrent protectionANSI code 67function n° F51X for 2-phase directional overcurrent (I1, I3) 1 ≤ X ≤ 2F52X for 3-phase directional overcurrent (I1, I2, I3)In order to use this function, it is necessary to befamiliar with the overcurrent and overvoltageprotection function procedures and settings(refer to appropriate sections).Equipmentc single-phase and three-phase current and voltagegeneratorsc phase shifter with angle indicatorc ammetersc voltmeterc chronometerc calculatorc adaptater for ECA modulec documentationWiringc diagrams B5 or B6c protective relays:F511/1, F511/2 for normal zone of set point 1F511/3, F511/4 for inverse zone of set point 1F512/1, F512/2 for normal zone of set point 2 (2)F512/3, F512/4 for inverse zone of set point 2 (2)F521/1, F521/2 for normal zone of set point 1F521/3, F521/4 for inverse zone of set point 1F522/1, F522/2 for normal zone of set point 2 (2)F522/3, F522/4 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 the VT secondary circuit phase-to-phasevoltagev set Uns, the VT secondary phase-to-phase voltagev set the number of wired VTs to 3Uv select the value of the CT primary circuitsv check the microswitches on the 3U/Vo, ECM orECA modules.(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 oftesting.(4)input value not taken into account by the F51X functionX = number of the protective relay.ProcedureThis protection checks the direction of currents I1, I2 (4) and I3 in comparison withvoltages U32, U13 (4) and U21 respectively, so that testing can be carried out usingsingle-phase current and voltage, changing only one current and the shift withrespect to its voltage each time.Iϕ1= α1θ°c protection parameter setting:Dir O/C Xv select the curvev set Is to the desired valuev set T to the desired value (see curves in appendix)v select angle θ (characteristic angle)v disable the following protections (3) O/C X; Under/C X; U/V X ; Unbalance;E/F (for sum of CTs) ; N Vol Disp (for sum of VTs)v inject the voltage or voltages and the current or currents in accordance withdiagram B5 or B6v select the appropriate phase shift in accordance with the protection activationzone, given:ϕ1 = α1 or ϕ2 = α2 or ϕ3 = α3 (single phase)ϕ1 = α1 + 90° or ϕ2 = α2 + 90° or ϕ3 = α3 + 90° (three phase) or ϕ1, ϕ2 and ϕ3being the angles read on the pocket terminal(±) α1, α2 et α3 being the phase shift angles of the injection unit.Example of test on U32 and I1 using single-phase current and voltage(see diagram B5)I1Isinverse zoneθinverse zoneV1ϕ1α1 θ°Isϕ1=90°+(α1)CharacteristiclineUnormal zoneCharacteristiclineU32normal zonev connect voltage U32: 0 to input U3 (terminal A3) and V to input U2 (terminal A4)v connect current I1: 0 to input N (terminal B1) and I to input I1 (terminal B4)c testing of Is set point for θ = 30° and definite timev inject phase-to-phase voltage Unsv set T to 0.05 sv inject current so that the phase shift angle ϕ1 can be set to 30° and 210°v check ϕ1 on the pocket terminalv stop current injection and reset Sepam 2000 to zero (1)v gradually increase the current until the protection output relay picks up:F511/1 or F511/2 for ϕ1 = 30°F511/3 or F511/4 for ϕ1 = 210°v read Is on the ammeter.1/12 Sepam 2000 - Testing