Table 26: Test points for phase-to-phase loops A-BTest point Value Comments1 X X1R 02 X 0R RLdFwd3 X 0.85·X1 R=0.491·X1+0.5 RFLdFwdPPR 0.85·X1·1/tan(60°)+0.5RFLdFwdPP4 X 0.85·X1R -0.85·X1·tan (AngNegRes-90°)5 X 0.5·RFLdFwdPP·tan (ArgLd)R 0.5·RFLdFwdPP6 X -0.5·RLdFwd·tan (ArgDir)R 0.5·RLdFwdThe table showing test points for phase-to-phase loops is used together with figure 23.10.4.6.1 Measuring the operating limit of set values GUID-B1B7DEB6-7BC3-4A90-8D8F-E4E69B434AFA v3Procedure:1. Supply the IED with healthy conditions for at least two seconds.2. Apply the fault condition and slowly decrease the measured impedance to find the operatevalue for of the phase-to-ground loop ECG, test point 1, according to figure 22. Compare theresult of the measurement with the expected value according to table 25.The corresponding binary signals that inform about the operation of the phase selectionmeasuring elements are available in the local HMI underMain menu/Test/Function status/Impedance Protection/PhaseSelection(PDIS, 21)/FRPSPDIS:x .3. Repeat steps 1 to 2 to find the operate values for the remaining test points according tofigure 22 and table 25.When the load encroachment characteristic is deliberately set very high inorder not to have an influence, then the test points 2 and 5 can be replaced bytest point 7.4. Repeat steps 1 to 3 to find the operate value for the phase-to-phase fault in A - C accordingto figure 23 and table 26.10.4.6.2 Completing the test M13906-301 v5Continue to test another function or end the test by changing theTestMode setting toDisabled.Restore connections and settings to their original values, if they were changed for testingpurposes.1MRK 504 154-UUS B Section 10Testing functionality by secondary injection99Commissioning manual
