1. Check that the settings in the IED are appropriate, especially the STARTvalue and the definite time delay. Set StartFreqGrad, to a rather smallnegative value.2. Supply the IED with three-phase voltages at their rated values.3. Slowly decrease the frequency of the applied voltage, with an increasing rate-of-change that finally exceeds the setting of StartFreqGrad, and check thatthe START signal appears.4. Note the operate value and compare it with the set value.5. Increase the frequency to rated operating conditions, and zero rate-of-change.6. Check that the START signal resets.7. Instantaneously decrease the frequency of the applied voltage to a value about20% lower than the nominal value.8. Measure the time delay for the TRIP signal, and compare it with the set value.Extended testing M16256-29 v41. The test above can be repeated to check a positive setting of StartFreqGrad.2. The tests above can be repeated to check the time to reset.3. The tests above can be repeated to test the RESTORE signal, when thefrequency recovers from a low value.13.7.3.2 Completing the test M16256-39 v4Continue 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.13.7.4 Frequency time accumulation protection functionFTAQFVR GUID-F7BD8E10-EF88-4698-87F4-0D4365004705 v2Prepare the IED for verification of settings as outlined in section “Overview” andsection “Preparing for test” in this chapter.13.7.4.1 Verifying the settings GUID-864636E0-6399-44E1-BD2C-C2113FB78C61 v3Time measurement and the injection of current and voltage can be done using acommon test equipment.Verification of the START value and time delay to operation1. Connect the test set for the injection of three-phase currents and three-phasevoltages to the appropriate current and voltage terminals of the IED.2. Ensure that the settings in the IED are appropriate, especially theCurrStartLevel, FreqHighLimit, FreqLowLimit, UHighLimit and ULowLimitsetting.3. Supply the IED with three-phase currents and voltages at their rated value.4. Slowly decrease the frequency of the applied voltage until it crosses thefrequency high limit and the START signal appears.Section 13 1MRK 502 073-UEN ATesting functionality by secondary injection218 Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062Commissioning manual
