quantity from the three-phase group, difference between maximum and minimumquantities (unbalance) can be derived and then used in the function.Due to the versatile possibilities of CVGAPC itself, but also the possibilities oflogic combinations in the application configuration of outputs from more than oneCVGAPC function block, it is hardly possible to define a fully covering generalcommissioning test.11.8.1.1 Built-in overcurrent feature (non-directional) SEMOD56488-9 v5Procedure1. Go to Main menu/Test/Function test modes/Multipurpose protection/GeneralCurrentVoltage(GAPC)/CVGAPC:x and make sure that CVGAPCto be tested is unblocked and other functions that might disturb the evaluationof the test are blocked.2. Connect the test set for injection of three-phase currents to the appropriatecurrent terminals of the IED.3. Inject current(s) in a way that relevant measured current (according to settingparameter CurrentInput) is created from the test set. Increase the current(s)until the low set stage operates and check against the set operate value.4. Decrease the current slowly and check the reset value.5. Block high set stage if the injection current will activate the high set stagewhen testing the low set stage according to below.6. Connect a TRIP output contact to the timer.7. Set the current to 200% of the operate value of low set stage, switch on thecurrent and check the time delay.For inverse time curves, check the operate time at a current equal to 110% ofthe operate current at tMin.8. Check that TRIP and START contacts operate according to the configurationlogic.9. Release the blocking of the high set stage and check the operate and resetvalue and the time delay for the high set stage in the same way as for the lowset stage.10. Finally check that START and TRIP information is stored in the event menu.Information on how to use the event menu is found in theoperator's manual.11.8.1.2 Overcurrent feature with current restraint SEMOD56488-35 v3The current restraining value has also to be measured or calculated and theinfluence on the operation has to be calculated when the testing of the operatevalue is done.ProcedureSection 11 1MRK 505 378-UEN ATesting functionality by secondary injection212 Line differential protection RED670 2.2 IECCommissioning manual
