ABB REG670 Commissioning Manual page 225

1MRK 502 073-UEN A
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Commissioning manual
Testing functionality by secondary injection
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.
Verification of the ACCALARM 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 for the default settings,
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. Continuously change the frequency of the applied voltage, so that for a certain
time the frequency is outside the set band limit and falls gradually within the
band limit.
6. Count only the time when the frequency lies within the set frequency band
limit. Wait for a time corresponding to tAccLimit and ensure that the
ACCALARM signal appears.
7. Measure the time delay for the ACCALARM signal and compare it to the set
value.
Extended testing
1. To check the value of TRIPACC, repeat the above test case in such a way that
the frequency of the applied voltage is within the set frequency band when
time approaches the tAccLimit setting value.
Verification of generator start and stop logic
1. Ensure that the settings in the IED are appropriate to the default settings,
especially the CurrStartLevel, FreqHighLimit, FreqLowLimit, UHighLimit and
ULowLimit.
2. Ensure that the setting CBCheck is enabled.
3. Supply the IED with three-phase currents and voltages at their rated values.
4. Slowly decrease the frequency of the applied voltage until the START signal
appears.
Section 13
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