Observe: Do not exceed the maximum permitted overloading of thecurrent 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 phases and thencheck that no TRLn signal appears.11.5.1.2 Completing the testContinue to test another function or end the test by changing the TESTMODE setting toDisabled. Restore connections and settings to their original values, if they were changedfor testing purposes.11.5.2 Directional phase overcurrent protection, four steps OC4PTOC(51_67)Prepare the IED for verification of settings outlined in Section "Preparing the IED toverify settings".Values of the logical signals for D2PTOC are available on the local HMI under Mainmenu/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 the localHMI.11.5.2.1 Verifying the settingsThe verification of the non-directional phase overcurrent function is doneas instructed below, but without applying any polarizing voltage.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 the fouravailable overcurrent steps, make sure that the step under test is enabled (forexample, end fault protection).If 1 out of 3 currents are chosen for operation: Connect the injection current to phasesA and neutral.If 2 out of 3 currents are chosen for operation: Connect the injection current intophase A and out from phase B.Section 11 1MRK 504 165-UUS -Testing functionality by secondary injection178 Transformer protection RET670 2.2 ANSICommissioning manual
