in % for two- and three-phase faultsx3 Zp 100X0 2 X1×= ×+ ×EQUATION124 V1 EN-US (Equation 109)in % for single-phase-to-earth faultsp 3 Z× xX0 2 X1 XM±×+--------------------------------------------- 100×=EQUATION125 V1 EN-US (Equation 110)in % for single-phase-to-earth faults with mutual zero sequence current.Where:p = the expected value of a distance to fault in percentZx = set test point on the test setX0 = set zero-sequence reactance of a lineX1 = set positive-sequence reactance of a lineXM = set mutual zero-sequence impedance of a line11.13.5.2 Completing the test M14955-84 v6Continue 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.11.13.6 Limit counter L4UFCNT GUID-7EBDC372-3407-4577-8B9A-6AB1758A1F34 v2The Limit counter function L4UFCNT can be tested by connecting a binary inputto the counter and applying pulses to the counter. The speed of the pulses must notexceed the cycle time of the function. Normally the counter will be tested whentesting the function that the counter is connected to, such as the trip function. Whenthe function is configured, test it together with the function that operates it. Triggerthe function and check that the counter result corresponds to the number ofoperations.11.13.6.1 Completing the test GUID-325F040B-BADC-4281-B965-9B7D6BFA3E15 v1Continue to test another function or end the test by changing the Test mode settingto Off. Restore connections and settings to their original values, if they werechanged for testing purposes.Section 11 1MRK 505 378-UEN ATesting functionality by secondary injection266 Line differential protection RED670 2.2 IECCommissioning manual
