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1MRK 504 165-UEN Rev. K
Verification of the low voltage magnitude blocking
1.
Check that the settings in the IED are appropriate, for example the StartFrequency 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.
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.
11.8.2.2
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
11.8.3
Rate-of-change frequency protection SAPFRC
Prepare the IED for verification of settings as outlined in section
section
11.8.3.1
Verifying the settings
Verification of START value and time delay to operate
1.
Check that the settings in the IED are appropriate, especially the START value and the definite
time delay. Set StartFreqGrad, to a rather small negative value.
2.
Supply the IED with three-phase voltages at their rated values.
3.
Slowly decrease the frequency of the applied voltage, with an increasing rate-of-change that
finally exceeds the setting of StartFreqGrad, and check that the START signal appears.
4.
Note the operate value and compare it with the set value.
5.
Increase the frequency to rated operating conditions, and zero rate-of-change.
6.
Check that the START signal resets.
7.
Instantaneously decrease the frequency of the applied voltage to a value about 20% lower than
the nominal value.
8.
Measure the time delay for the TRIP signal, and compare it with the set value.
Extended testing
1.
The test above can be repeated to check a positive setting of StartFreqGrad.
2.
The tests above can be repeated to check the time to reset.
3.
The tests above can be repeated to test the RESTORE signal, when the frequency recovers
from a low value.
11.8.3.2
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
Transformer protection RET670
Commissioning manual
"Preparing for test"
in this chapter.
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Testing functionality by secondary injection
"Requirements"
and
Section 11
M16290-34 v6
M16290-52 v5
M16256-2 v6
M16256-8 v1
M16256-10 v5
M16256-29 v4
M16256-39 v4
219
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