11.4.14 Phase preference logic PPLPHIZ GUID-BD8EE7A0-710D-49C8-9B56-CB908BAF2C59 v7Prepare the IED for verification of settings outlined in Section "Preparing the IEDto verify settings".The Phase preference logic function PPLPHIZ is tested with a three-phase testingequipment for distance protections. PPLPHIZ is tested in co-operation with theDistance protection zone, quadrilateral characteristic function ZMQPDIS. Thedistance protection and the phase preference logic shall be set to values accordingto the real set values to be used. The test is made by means of injection of voltageand current where the amplitude of both current and voltage and the phase anglebetween the voltage and current can be controlled.During the test the following binary signals (outputs) shall be monitored:• Trip signal from distance protection• Start signal from phase preference logic1. Connect the test set for injection of voltage and current.2. Inject voltages and currents corresponding to a phase-to-phase to earth faultwithin zone 1 of the distance protection function. In the test one of the currentinputs (one of the faulted phases) is disconnected. The remaining current is thefault current out on the protected line. All combinations of two phase-to-earthfaults with one phase current are tested. The result shall be according to table34. It should be checked that the fault will give phase-to-phase voltage, phase-to-earth voltage, zero-sequence voltage and phase current so that theconditions set for the logic are fulfilled.Table 34:Operation at different combinations of faults and operation modeOperMode Fault type/Faulted phase current to the IEDL1L2N/IL1 L1L2N/IL2 L2L3N/IL2 L2L3N/IL3 L3L3N/IL1 L3L1N/IL3No Filter Trip Trip Trip Trip Trip TripNo Pref Trip Trip Trip Trip Trip Trip1231c Trip No Trip Trip No Trip No Trip Trip1321c No Trip Trip No Trip Trip Trip No Trip123a Trip No Trip Trip No Trip Trip No Trip132a Trip No Trip No Trip Trip Trip No Trip213a No Trip Trip Trip No Trip Trip No Trip231a No Trip Trip Trip No Trip No Trip Trip312a Trip No Trip No Trip Trip No Trip Trip321a No Trip Trip No Trip Trip No Trip Trip1MRK 505 378-UEN A Section 11Testing functionality by secondary injectionLine differential protection RED670 2.2 IEC 169Commissioning manual
