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Section 12
Testing functionality by secondary injection
12.7.2.2
12.7.3
12.7.3.1
190
Verification of the low voltage magnitude blocking
1.
Check that the settings in the IED are appropriate, for example the
StartFrequency, UMin, 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, UMin.
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
section
"Preparing for test"
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
in this chapter.
1MRK502053-UEN B
"Requirements"
Generator protection REG670 2.0 IEC
Commissioning manual
and
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Table of Contents
Troubleshooting
