1. Subject the IED to healthy normal load conditions for at least two seconds.2. Apply the fault condition to find the operating time for the phase-to-phasefault according to test point 12 in figure 23 and table 20 for zone 1. Comparethe result of the measurement with the setting t1PP.3. Repeat steps 1 to 2 to find the operating time for the phase-to-earth faultaccording to test point 12 in figure 24 and table 21. Compare the result of themeasurement with the setting t1PE.4. Repeat steps 1 to 3 to find the operating time for all other used measuringzones.Observe that the zones that are not tested have to be blocked and the zone thatis tested has to be released.11.4.1.3 Completing the test M14944-167 v3Continue to test another function or end the test by changing the TESTMODEsetting to Off. Restore connections and settings to their original values, if they werechanged for testing purposes.11.4.2 Phase selection, quad, fixed angle, load encroachmentFDPSPDIS M13906-3 v10Prepare the IED for verification of settings outlined in Section "Preparing the IEDto verify settings".The phase selectors operate on the same measuring principles as the impedancemeasuring zones. So it is necessary to follow the same principles as for distanceprotection, when performing the secondary injection tests.Measure operating characteristics during constant current conditions. Keep themeasured current as close as possible to the rated value of its associated inputtransformer, or lower. But ensure that it is higher than the set minimum operatingcurrent.Ensure that the maximum continuous current to the IED does not exceed four timesits rated value, if the measurement of the operating characteristics runs underconstant voltage conditions.To verify the settings the operating points according to figures 25 and 26 should betested. See also tables 22 and 23 for information.Section 11 1MRK 505 378-UEN ATesting functionality by secondary injection118 Line differential protection RED670 2.2 IECCommissioning manual
