10.6.2.1 Verifying the settingsVerification of START value and time delay to operate1. Check that the settings in the IED are appropriate, for example the START valueand the time delay.2. Supply the IED with three-phase voltages at their rated values.3. Slowly increase the frequency of the applied voltage, until the START signalappears.4. Note the operate value and compare it with the set value.5. Decrease the frequency to rated operating conditions.6. Check that the START signal resets.7. Instantaneously increase the frequency of the applied voltage to a value about1% lower than the operate value (a step change more than 2% will increase thetime delay).8. Measure the time delay for the TRIP signal, and compare it with the set value.Note that the measured time consists of the set value for time delay plusminimum operate time of the start function (80 - 90 ms).Extended testing1. The test above can be repeated to check the time to reset.Verification of the low voltage magnitude blocking1. Check that the settings in the IED are appropriate, for example theStartFrequency, UMin, and the tDelay.2. Supply the IED with three-phase voltages at their rated values.3. Slowly decrease the magnitude of the applied voltage, until the BLKDMAGNsignal appears.4. Note the voltage magnitude value and compare it with the set value, UMin.5. Slowly increase the frequency of the applied voltage, to a value aboveStartFrequency.6. Check that the START signal does not appear.7. Wait for a time corresponding to tDelay, make sure that the TRIP signal does notappear.10.6.2.2 Completing the testContinue to test another function or end the test by changing the TestMode setting toOff. Restore connections and settings to their original values, if they were changed fortesting purposes.Section 10 1MRK 511 360-UEN ATesting functionality by secondary injection128 Bay control REC670 2.1 IECCommissioning manual
