ABB Relion 670 series, Installation And Commissioning Manual

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5. Slowly decrease the frequency of the applied voltage, to a value below
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 not appears.
15.8.1.2 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.
15.8.2 Overfrequency protection SAPTOF
Prepare the IED for verification of settings outlined in section "Overview" and
section "Preparing for test" in this chapter.
15.8.2.1 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.
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.
Section 15
1MRK 502 029-UEN A
Verifying settings by secondary injection
202
Installation and commissioning manual