1. Connect the test set for three-phase current injection to the appropriate IEDterminals.2. Inject a symmetrical three-phase current larger than the set value I<.3. Decrease the injected current in phase L1 and note the operated value (startvalue) of the studied step of the function.4. Increase the current slowly and note the reset value.5. Connect a trip output contact to a timer.6. Decrease the injected current step-wise to 50% of the operate level and checkthe time delay.7. Check that all trip and start contacts operate according to the configuration(signal matrices).8. Finally check that start and trip information is stored in the event memory.9. Repeat steps 2 – 7 for phases L2 and L3.Completing the testContinue 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.11.12 Logic SEMOD53577-1 v111.12.1 Tripping logic, common 3-phase output SMPPTRC SEMOD54375-102 v10Prepare the IED for verification of settings outlined in Section "Preparing the IEDto verify settings".This function is functionality tested together with other protection functions (linedifferential protection, earth-fault overcurrent protection, and so on) within theIED. It is recommended that the function is tested together with the autorecloserfunction, when built into the IED or when a separate external unit is used forreclosing purposes.11.12.1.1 3 phase operating mode SEMOD54375-106 v101. Check that AutoLock and TripLockout are both set to Off.2. Initiate a three-phase fault.An adequate time interval between the faults should be considered, toovercome a reclaim time caused by the possible activation of the autorecloserfunction SMBRREC. The function must issue a three-phase trip in all caseswhen trip is initiated by any protection or some other built-in or externalfunction. The following functional output signals must always appearsimultaneously: TRIP, TRL1, TRL2, TRL3 and TR3P.Section 11 1MRK 505 378-UEN ATesting functionality by secondary injection256 Line differential protection RED670 2.2 IECCommissioning manual
