Completing The Test; Frequency Time Accumulation Protection Function Ftaqfvr; Verifying The Settings - ABB REG670 Commissioning Manual

Section 13
Testing functionality by secondary injection
13.7.3.2
13.7.4
13.7.4.1
218
1. Check that the settings in the IED are appropriate, especially the START
value and the definite time delay. Set StartFreqGrad, to a rather small
negative 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 that
the 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 about
20% lower than the nominal value.
8. Measure the time delay for the TRIP signal, and compare it with the set value.
Extended testing
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.
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
1MRK 502 073-UEN A
M16256-29 v4
M16256-39 v4
GUID-F7BD8E10-EF88-4698-87F4-0D4365004705 v2
GUID-864636E0-6399-44E1-BD2C-C2113FB78C61 v3
Commissioning manual