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.
12.7.3.2
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.
12.7.4
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.
12.7.4.1
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.
1MRK502053-UEN B
Section 12
Testing functionality by secondary injection
Generator protection REG670 2.0 IEC
191
Commissioning manual
Summary of Contents for REG670 2.0 IEC
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