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.
2. Supply the IED with three-phase voltages at their rated values.
3. Slowly increase the frequency of the applied voltage, until the START signal
appears.
4. Note the operate value and compare it with the set value.
5. Decrease the frequency to rated operating conditions.
6. Check that the START signal resets.
7. Instantaneously increase the frequency of the applied voltage to a value about
20% higher than the operate 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 the time to reset.
Verification of the low voltage magnitude blocking
1. Check that the settings in the IED are appropriate, especially the
StartFrequency, IntBlocklevel, and the TimeDlyOperate.
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,
IntBlocklevel.
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 TimeDlyOperate, and make sure that the
TRIP signal does not appear.
13.8.2.2 Completing the test
Continue to test another function or end the test by changing the Test mode setting
to Off. Restore connections and settings to their original values, if they were
changed for testing purposes.
13.8.3 Rate-of-change frequency protection SAPFRC
Prepare the IED for verification of settings as outlined in section
"Overview" and
section "Preparing for test" in this chapter.
13.8.3.1 Verifying the settings
Section 13 1MRK 504 088-UEN C
Verifying settings by secondary injection
166
Installation and commissioning manual
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