12.4.15 Under impedance protection for Generator ZGVPDISGUID-F882501B-6A03-4409-BF70-DE1CF09E5541 v3Prepare the IED for verification of settings.Values of the logical signals for ZGVPDIS are available on the local HMI under Main menu/Tests/Function status/Impedance/ZGVPDIS (21G, Z<)/1:ZGVPDIS:ZGVPDIS. The SignalMonitoring in PCM600 shows the same signals that are available on the local HMI.12.4.15.1 Verifying the settings GUID-202C5606-5F12-4C00-A12F-02A33EB571D9 v1GUID-69610335-7C97-4134-8A47-05501AB5C620 v3Distance protection zonesWhile measuring operating characteristics, keep the current constant. Keep the current asclose as possible to its rated value or lower, however make sure it is higher than 30% of therated current.If the measurement of the operating characteristics runs under constant voltage conditions,ensure that the maximum continuous current in an IED does not exceed four times its ratedvalue.To verify the zone 1 mho characteristic, at least two points must be tested.P1P3P4XRLineAngleZ1FwdZ1RevP2IEC11000312-2-en.vsdIEC11000312 V2 EN-USFigure 53: Proposed four test points for phase-to-phase faultWhere,Z1Fwd is the forward positive sequence impedance setting for zone 1Z1Rev is the reverse positive sequence impedance setting for zone 1LineAngle is the Impedance angle for phase-to-phase fault in degreesSection 12 1MRK 502 067-UEN BTesting functionality by secondary injection150Commissioning manual
