1. Connect voltages to the IED according to valid connection diagram and figure65.2. Set Ur (rated voltage) to the U1 inputs and increase U2 voltage untildifferential voltage is 1.5 · operating level (UDTrip).3. Switch on the test set. Measure the time from activation of the START signaluntil TRIP signal is activated.4. Check the measured time by comparing it to the set trip time tTrip.5. Increase the voltage until START signal resets. Measure the time from resetof START signal to reset of TRIP signal.6. Check the measured time by comparing it to the set trip reset time tReset.13.7.5.4 Final adjustment of compensation for VT ratio differencesProcedure1. With the protection in test mode, view the differential voltage service valuesin each phase on the local HMI under Main menu/Test/Function status/Voltage protection/VoltageDiff(PTOV,60)/VDCx.The IED voltage inputs should be connected to the VTsaccording to valid connection diagram.2. Record the differential voltages.3. Calculate the compensation factor RFLx for each phase.For information about calculation of the compensation factor, see theapplication manual.4. Set the compensation factors on the local HMI under Main menu/Settings/Settings group N/Voltage protection/VoltageDiff(PTOV,60)/VDCx5. Check that the differential voltages are close to zero.13.7.5.5 Completing the testContinue to test another function or end the test by changing the Test mode settingto Off. Restore connections and settings to their original values, if they werechanged for testing purposes.13.7.6 Loss of voltage check LOVPTUVPrepare the IED for verification of settings as outlined in section "Overview" andsection "Preparing for test" in this chapter.13.7.6.1 Measuring the operate limit of set values1MRK 504 088-UEN C Section 13Verifying settings by secondary injection163Installation and commissioning manual
