Completing The Test; Overfrequency Protection Saptof - ABB rec670 Commissioning Manual

1MRK 511 360-UEN A
10.6.1.2
10.6.2
Bay control REC670 2.1 IEC
Commissioning manual
Testing functionality by secondary injection
1. Check that the IED settings are appropriate, for example the START value and
the time delay.
2. Supply the IED with three-phase voltages at their rated values.
3. Slowly decrease the frequency of the applied voltage, until the START signal
appears.
4. Note the operate value and compare it with the set value.
5. Increase the frequency until rated operating levels are reached.
6. Check that the START signal resets.
7. Instantaneously decrease 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 of 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.
2. The tests above can be repeated to test the frequency dependent inverse time
characteristic.
Verification of the low voltage magnitude blocking
1. Check that the IED settings are appropriate, for example the StartFrequency,
UMin , and the tDelay.
2. Supply the IED with three-phase voltages at 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 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 tDelay, make sure that the TRIP signal does not
appear.

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.

Overfrequency protection SAPTOF

Prepare the IED for verification of settings outlined in section
verify settings".
Section 10
"Preparing the IED to
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