10.6.3
Rate-of-change frequency protection SAPFRC
Prepare the IED for verification of settings outlined in section
.
10.6.3.1
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.
10.6.3.2
Completing the test
Continue to test another function or end the test by changing the
TestMode
setting to
Off
. Restore connections and settings to their original values, if they were changed for
testing purposes.
10.6.4
Frequency time accumulation protection function FTAQFVR
Prepare the IED for verification of settings as outlined in section “Overview” and
section “Preparing for test” in this chapter.
10.6.4.1
Verifying the settings
Time measurement and the injection of current and voltage can be done using a
common test equipment.
1MRK 511 360-UEN A
Section 10
Testing functionality by secondary injection
Bay control REC670 2.1 IEC
129
Commissioning manual
