Observe: Do not exceed the maximum permitted overloadingof the current circuits in the IED.5. Compare the measured operating current with the set value.6. Set the operation mode to 2 out of 3 and inject current into one of the phasesand then check that no TRLn signal appears.11.5.1.2 Completing the test M11754-24 v5Continue 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.11.5.2 Directional phase overcurrent protection, four stepsOC4PTOC SEMOD56287-67 v9Prepare the IED for verification of settings outlined in Section "Preparing the IEDto verify settings".Values of the logical signals for OC4PTOC are available on the local HMI underMain menu/Tests/Function status/Current protection/PhaseOverCurrent4Step(51_67,4(3I>))/OC4PTOC(51_67;4(3I>)):x, where x =instance number.The Signal Monitoring in PCM600 shows the same signals that are available on thelocal HMI.11.5.2.1 Verifying the settings SEMOD56287-72 v10The verification of the non-directional phase overcurrent function isdone as instructed below, but without applying any polarizingvoltage.1. Connect the test set for current injection to the appropriate IED phases.If there is any configuration logic that is used to enable or block any of thefour available overcurrent steps, make sure that the step under test is enabled(for example, end fault protection).If 1 out of 3 currents are chosen for operation: Connect the injection currentto phases L1 and neutral.If 2 out of 3 currents are chosen for operation: Connect the injection currentinto phase L1 and out from phase L2.Section 11 1MRK 505 378-UEN ATesting functionality by secondary injection172 Line differential protection RED670 2.2 IECCommissioning manual
