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Section 11
Testing functionality by secondary injection
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 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.
11.6.1.2
Completing the test
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.
11.6.2
Overfrequency protection SAPTOF (81)
Prepare the IED for verification of settings outlined in Section
11.6.2.1
Verifying the settings
Verification of PICKUP value and time delay to trip
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.
7.
Set the frequency to 20 mHz under the trip value.
8.
Increase the frequency with a 40 mHz step, applying it for a period that is 10% longer than tDelay.
9.
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 trip time of the pickup 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
122
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1MRK 511 409-UUS Rev. K
"Preparing the IED to verify
Phasor measurement unit RES670
Commissioning manual
M16289-31 v6
M16289-39 v7
M16289-57 v5
M16290-2 v7
settings".
M16290-12 v2
M16290-14 v6
M16290-28 v4
M16290-34 v6
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