5. Slowly increase the frequency of the applied voltage, to a value above
StartFrequency.
6. Check that the START signal does not appear.
7. Wait for a time corresponding to tDelay, make sure that the TRIP signal does
not appear.
9.6.2.2 Completing the test
M16290-52 v5
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.
9.6.3 Rate-of-change frequency protection SAPFRC
M16256-2 v6
Prepare the IED for verification of settings outlined in Section "Preparing the IED
to verify settings".
9.6.3.1 Verifying the settings
M16256-8 v1
Verification of START value and time delay to operate
M16256-10 v5
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
M16256-29 v4
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.
1MRK 506 383-UEN A Section 9
Testing functionality by secondary injection
Line distance protection REL650 2.2 IEC 129
Commissioning manual
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