a slightly higher operating value is no problem as the sensitivity
is not influenced much.
2. Increase the voltage and make note of the operate value U>Trip. This is done by
manual testing and without trip of the test set.
3. Connect the trip contact to the test set to stop the test set for measurement of trip
times below.
4. Reduce the voltage slowly and make note of the reset value. The reset value must
be high for this function.
5. Check the operating time by injecting a voltage corresponding to 1.2 ˣ U>Trip
level. Make note of the measured trip time.
6. If required, verify the trip time at another voltage. Normally 2 ˣ U>Trip is
selected.
7. If used, measure the alarm level operating value. Increase the voltage and make
note of the operate value U>Alarm. This is done with manual test and without
trip of the test set.
8. Measure the operating time on the alarm output by connecting the stop of the test
set to an output from tAlarm. Inject a voltage 1.2 ˣ U>Alarm and measure the
alarm time.
9. Check that trip and alarm outputs operate according to the configuration logic.
10. Finally check that start and alarm information is stored in the event menu and if
a serial connection to the SA is available verify that the correct and only the
required signals are presented on the local HMI and on the SCADA system.
Information on how to use the event menu is found in the operator's
manual.
12.3.2.2 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.
12.3.3 Generator differential protection GENPDIF
Prepare the IED for verification of settings outlined in section
"Requirements" and
section "Preparing for test" in this chapter.
12.3.3.1 Verifying the settings
1. Go to Main menu/Test/Function test modes/Differential protection and
make sure all other functions, configured to the same current transformer inputs
1MRK502053-UEN B Section 12
Testing functionality by secondary injection
Generator protection REG670 2.0 IEC 107
Commissioning manual
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