6. Check that the START signal resets.
7. Instantaneously increase the frequency of the applied voltage to a value about
1% lower than the operate value (a step change more than 2% will increase the
time delay).
8. 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 operate time of the start 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
StartFrequency, UMin, 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, UMin.
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.
10.7.2.2 Completing the test
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.
10.7.3 Rate-of-change frequency protection SAPFRC
Prepare the IED for verification of settings outlined in section
"Preparing the IED to
verify settings".
10.7.3.1 Verifying the settings
Verification of START value and time delay to operate
Section 10 1MRK 506 355-UEN A
Testing functionality by secondary injection
184 Line distance protection REL670 2.1 IEC
Commissioning manual
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