Rate-Of-Change Frequency Protection Sapfrc; Verifying The Settings; Completing The Test; Frequency Time Accumulation Protection Function Ftaqfvr - ABB RELION REG670 Commissioning Manual

1MRK 502 067-UEN B
12.7.3

Rate-of-change frequency protection SAPFRC

Prepare the IED for verification of settings as outlined in section
section
12.7.3.1

Verifying the settings

Verification of START value and time delay to operate
1. Check that the settings in the IED are appropriate, especially the START value and the
definite time delay. Set
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
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
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
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
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.
Commissioning manual
"Preparing for test" in this chapter.
StartFreqGrad , to a rather small negative value.
StartFreqGrad , and check that the START signal
Testing functionality by secondary injection
"Requirements" and
StartFreqGrad .
TestMode setting to Off .
GUID-F7BD8E10-EF88-4698-87F4-0D4365004705 v2
GUID-864636E0-6399-44E1-BD2C-C2113FB78C61 v3
CurrStartLevel ,
Section 12
M16256-2 v6
M16256-8 v1
M16256-10 v5
M16256-29 v4
M16256-39 v4
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