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.
13.7.2.2 Completing the test
M16290-52 v5
Continue to test another function or end the test by changing the TESTMODE setting to
Disabled. Restore connections and settings to their original values, if they were
changed for testing purposes.
13.7.3 Rate-of-change frequency protection SAPFRC (81)
M16256-2 v6
Prepare the IED for verification of settings outlined in Section "Preparing the IED to
verify settings".
13.7.3.1 Verifying the settings
M16256-8 v1
PICKUP value and time delay to trip
M16256-10 v5
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
M16256-29 v4
1. The test above can be repeated to check a positive setting of PickupFreqGrad.
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.
Section 13 1MRK 502 073-UUS A
Testing functionality by secondary injection
234 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Commissioning manual
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