5. Note the frequency value at which the TRIP signal appears and compare it with the set value
StartFrequency.
6. Increase the frequency until its rated value is reached.
7. Check that the PICKUP signal resets.
8. Supply the IED with three-phase voltages at their rated values and frequency 20 mHz over the set
value StartFrequency.
9. Decrease the frequency with a 40 mHz step, applying it for a time that is at least 10% longer than
(tDelay+100ms).
10. 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 trip time of the pickup
start function (80 - 90 ms).
Extended testing
M16289-31 v6
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
M16289-39 v7
1. Check that the IED settings are appropriate, for example the PUFrequency, VMin, 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 VMin.
5. Slowly decrease the frequency of the applied voltage, to a value below PUFrequency.
6. Check that the PICKUP signal does not appear.
7. Wait for a time corresponding to tDelay, make sure that the TRIP signal does not appear.
11.8.1.2 Completing the test
M16289-57 v5
Continue to test another function or end the test by changing the TESTMODE setting to Disabled.
Restore connections and settings to the original values, if changed for testing purposes.
11.8.2 Overfrequency protection SAPTOF (81)
M16290-2 v7
Prepare the IED for verification of settings outlined in Section
"Preparing the IED to verify settings".
11.8.2.1 Verifying the settings
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Verification of PICKUP value and time delay to trip
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1. Check that the IED settings are appropriate, for example the pickup value and the time delay.
2. Supply the IED with three-phase voltages at their rated values and initial frequency.
3. Slowly increase the frequency of the applied voltage with a 40 mHz step, applying it for a period
that is 10% longer than tDelay.
4. Note the trip value and compare it with the set value.
5. Decrease the frequency to rated operating conditions.
6. Check that the PICKUP signal resets.
1MRK 504 165-UUS Rev. J Section 11
Testing functionality by secondary injection
Transformer protection RET670 229
Commissioning manual
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