5.
Slowly decrease the frequency of the applied voltage, to a value below
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.
12.7.1.2
Completing the test
M16289-57 v5
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.
12.7.2
Overfrequency protection SAPTOF
M16290-2 v6
Prepare the IED for verification of settings as outlined in section
and
in this chapter.
12.7.2.1
Verifying the settings
M16290-12 v2
Verification of START value and time delay to operate
M16290-14 v5
1.
Check that the settings in the IED are appropriate, for example the START value and the
time delay.
2.
Supply the IED with three-phase voltages at their rated values.
3.
Slowly increase the frequency of the applied voltage, until the START signal appears.
4.
Note the operate value and compare it with the set value.
5.
Decrease the frequency to rated operating conditions.
6.
Check that the START signal resets.
7.
Instantaneously increase the frequency of the applied voltage to a value about 1% lower
than the operate value (a step change more than 2% will increase the time delay).
8.
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 operate time of
the start function (80 - 90 ms).
Extended testing
M16290-28 v4
1.
The test above can be repeated to check the time to reset.
Verification of the low voltage magnitude blocking
M16290-34 v5
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.
12.7.2.2
Completing the test
M16290-52 v5
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.
Section 12
1MRK 502 067-UEN B
Testing functionality by secondary injection
194
Commissioning manual
