Completing The Test; Rate-Of-Change Frequency Protection Sapfrc; Verifying The Settings - ABB RET670 Commissioning Manual
Relion 670 series, transformer protection
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- Applications manual (1016 pages) ,
- Commissioning manual (328 pages) ,
- Installation and commissioning manual (240 pages)
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1MRK 504 165-UEN A
11.7.2.2
11.7.3
11.7.3.1
Transformer protection RET670 2.2 IEC
Commissioning manual
Testing functionality by secondary injection
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.
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.
Rate-of-change frequency protection SAPFRC
Prepare the IED for verification of settings outlined in Section
to verify
settings".
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.
Section 11
M16290-52 v5
M16256-2 v6
"Preparing the IED
M16256-8 v1
M16256-10 v5
M16256-29 v4
217
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