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Section 12
Testing functionality by secondary injection
12.5.4.2
12.5.4.3
12.5.5
152
7.
Connect a trip output contact to a timer.
8.
Set the injected current to 200% of the operate level of the tested step, switch on
the current and check the time delay.
For inverse time curves, check the operate time at a current equal to 110% of the
operate current for txMin.
9.
Check that all trip and start contacts operate according to the configuration
(signal matrixes)
10. Reverse the direction of the injected current and check that the step does not
operate.
11. Check that the protection does not operate when the polarizing voltage is zero.
12. Repeat the above described tests for the higher set steps.
13. Finally, check that start and trip information is stored in the event menu.
Four step non-directional earth fault protection
1.
Do as described in
applying any polarizing voltage.
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.
Four step negative sequence overcurrent protection
NS4PTOC
Prepare the IED for verification of settings as outlined in section
in this chapter.
When inverse time overcurrent characteristic is selected, the operate
time of the stage will be the sum of the inverse time delay and the set
definite time delay. Thus, if only the inverse time delay is required, it
is of utmost importance to set the definite time delay for that stage to
zero.
In version 2.0, a typical starting time delay of 24ms is subtracted from
the set trip time delay, so that the resulting trip time will take the
internal IED start time into consideration.
Procedure
"Four step directional earth fault
1MRK502053-UEN B
protection", but without
"Preparing for test"
Generator protection REG670 2.0 IEC
Commissioning manual
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Table of Contents
Troubleshooting
