12.6.6.3
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.
12.7
Frequency protection
12.7.1
Underfrequency protection SAPTUF
Prepare the IED for verification of settings outlined in section
section
in this chapter.
12.7.1.1
Verifying the settings
Verification of START value and time delay to operate
1.
Check that the IED settings 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 decrease the frequency of the applied voltage, until the START signal
appears.
4.
Note the operate value and compare it with the set value.
5.
Increase the frequency until rated operating levels are reached.
6.
Check that the START signal resets.
7.
Instantaneously decrease 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 of 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
1.
The test above can be repeated to check the time to reset.
2.
The tests above can be repeated to test the frequency dependent inverse time
characteristic.
Verification of the low voltage magnitude blocking
Section 12
1MRK502053-UEN B
Testing functionality by secondary injection
188
Generator protection REG670 2.0 IEC
Commissioning manual
Содержание REG670 2.0 IEC
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