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1MRK502053-UEN B
12.7.3.2
12.7.4
12.7.4.1
Generator protection REG670 2.0 IEC
Commissioning manual
Testing functionality by secondary injection
1.
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 the frequency
recovers from a low value.
Completing the test
Continue to test another function or end the test by changing the TestMode setting to
Off. Restore connections and settings to their original values, if they were changed for
testing purposes.
Frequency time accumulation protection function FTAQFVR
Prepare the IED for verification of settings as outlined in section "Overview" and
section "Preparing for test" in this chapter.
Verifying the settings
Time measurement and the injection of current and voltage can be done using a
common test equipment.
Verification of the START value and time delay to operation
1.
Connect the test set for the injection of three-phase currents and three-phase
voltages to the appropriate current and voltage terminals of the IED.
2.
Ensure that the settings in the IED are appropriate, especially the CurrStartLevel,
FreqHighLimit, FreqLowLimit, UHighLimit and ULowLimit setting.
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 the
frequency high limit and the START signal appears.
5.
Check that the FREQOK signal appears.
6.
Compare the operate value to the set frequency high limit value.
7.
Decrease the frequency of the applied voltage until it crosses the frequency low
limit and the START signal disappears.
8.
Check that the FREQOK signal disappears.
9.
Compare the reset value to the set frequency low limit value.
10. Readjust the frequency of the applied voltage (with steps of 0.001 Hz/s) to a value
within the set frequency band limit.
11. Ensure that the START signal reappears.
12. Wait for a time corresponding to tCont and ensure that the TRIP and TRIPCONT
signals are generated.
13. Measure the time delay for the TRIP signal and compare it to the set value.
Section 12
191
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Troubleshooting
