If the VRPVOC function is used as an overcurrent protectionwith undervoltage seal-in, it is necessary to first injectsufficient current to activate the STOC signal before theunder-voltage step is allowed to operate. In order to achievethat, apply symmetric three-phase voltages at their rated valueand then inject a current IL1 that is 200% higher than the setoperation level. Then slowly decrease the voltage in twophases simultaneously, until the STUV and START signalsappear.15. Increase slowly the applied voltages of the previous two phases and note thereset value.16. Check that the trip output of the relay is connected to the input channel of thetest in order to stop the injection and measure the trip time.17. Inject symmetric three-phase voltages at their rated value and check that theSTUV and START signals reset as well as the trip signals of the functionblock (TRIP and TRUV).18. Instantaneously decrease the voltage in two phases simultaneously to a value20% lower than the set operate value (take into account the previous note ifVRPVOC is configured in ACT with the undervoltage seal-in feature).19. Measure the definite time delay for the TRUV and TRIP signals and compareit with the set value tDef_UV.20. Check that start and operate information is stored in the event menu.13.5.14.2 Completing the test GUID-8A33AACE-7B89-4981-A872-78044BB1FD0D v2Continue 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.13.5.15 Generator stator overload protection GSPTTRGUID-A0B3EA43-7EEC-4FCC-A5BF-44BB8A8055E0 v113.5.15.1 Verifying the settings GUID-6B85A379-E977-48CC-B15C-4AF3EAB78478 v2Explained testing method is given for default value for the k1 parameter.The function has heating content memory features. Thus if testing shots are doneconsecutively, operate time will be shorten accordingly, compared to the givenoperate characteristic. Therefore either wait until set tReset time has elapsed,between two shots, or reset this memory by setting the RESET input into thefunction to value TRUE1MRK 502 073-UEN A Section 13Testing functionality by secondary injectionGenerator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 201Commissioning manual
