6. Check that the START signal resets.
7. Supply the IED with three-phase voltages at their rated values and frequency
20 mHz over the set value StartFr
equency.
8. Decrease the frequency with a 40 mHz step, applying it for a time that is at
least 10% longer than (tDelay+100ms).
9. Measure the time delay of the TRIP signal, and compare it with the set value
tDelay. Note that the measured time consists of the set value of the time delay
plus the minimum operate time of the start function (80 - 90 ms).
Extended testing
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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
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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.
11.7.1.2 Completing the test
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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.
11.7.2 Overfrequency protection SAPTOF
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Prepare the IED for verification of settings outlined in Section
"Preparing the IED
to verify settings".
11.7.2.1 Verifying the settings
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Verification of START value and time delay to operate
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1MRK 505 378-UEN A Section 11
Testing functionality by secondary injection
Line differential protection RED670 2.2 IEC 209
Commissioning manual
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