Completing The Test; Rate-Of-Change Frequency Protection Sapfrc (81); Verifying The Settings - ABB Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
7. Set the frequency to 20 mHz under the trip value.
8. Increase the frequency with a 40 mHz step, applying it for a period that is 10% longer than tDelay.
9. Measure the time delay for the TRIP signal, and compare it with the set value. Note that the
measured time consists of the set value for time delay plus minimum trip time of the pickup function
(80 - 90 ms).
Extended testing
1. The test above can be repeated to check the time to reset.
Verification of the low voltage magnitude blocking
1. Check that the settings in the IED are appropriate, for example the PUFrequency and the tDelay.
2. Supply the IED with three-phase voltages at their rated values.
3. Slowly decrease the magnitude of the applied voltage, until the BLKDMAGN signal appears.
4. Note the voltage magnitude value and compare it with the set value.
5. Slowly increase the frequency of the applied voltage, to a value above PUFrequency.
6. Check that the PICKUP signal does not appear.
7. Wait for a time corresponding to tDelay, make sure that the TRIP signal does not appear.
11.7.2.2

Completing the test

Continue to test another function or end the test by changing the TESTMODE setting to Disabled.
Restore connections and settings to the original values, if changed for testing purposes.
11.7.3

Rate-of-change frequency protection SAPFRC (81)

Prepare the IED for verification of settings as outlined in section
for test" in this chapter.
11.7.3.1

Verifying the settings

PICKUP value and time delay to trip
1. Check that the settings in the IED are appropriate, especially the PICKUP value and the definite
time delay. Set PickupFreqgrad, 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 PickupFreqgrad, and check that the PICKUP signal appears.
4. Note the trip 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 PICKUP 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
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