6. Block lower set steps when testing higher set steps according to the instructions
that follow.
7. Connect a trip output contact to a timer.
8. Set the injected current to 200% of the trip level of the tested step, switch on the
current and check the time delay.
For inverse time curves, check the trip time at a current equal to 110% of the trip
current for txMin.
9. Check that all trip and pickup contacts trip according to the configuration (signal
matrixes)
10. Reverse the direction of the injected current and check that the step does not trip.
11. Check that the protection does not trip when the polarizing voltage is zero.
12. Repeat the above described tests for the higher set steps.
13. Finally, check that pickup and trip information is stored in the event menu.
13.5.4.2 Four step non-directional ground fault protection
SEMOD53296-202 v4
1. Do as described in
"Four step directional ground fault protection", but without
applying any polarizing voltage.
13.5.4.3 Completing the test
SEMOD53296-122 v4
Continue to test another function or end the test by changing the TESTMODE setting to
Disabled. Restore connections and settings to their original values, if they were
changed for testing purposes.
13.5.5 Four step negative sequence overcurrent protection
NS4PTOC (46I2)
GUID-EB1A8DFD-5BAC-4024-ADA2-D9BE7A2B50A0 v2
Prepare the IED for verification of settings as outlined in section
"Preparing for test" in
this chapter.
GUID-F7AA2194-4D1C-4475-8853-C7D064912614 v4
When inverse time overcurrent characteristic is selected, the trip 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
important to set the definite time delay for that stage to zero.
GUID-F973601F-BC67-4E4F-A4CA-BE6253E2FB92 v3
Procedure
Section 13 1MRK 502 073-UUS A
Testing functionality by secondary injection
192 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Commissioning manual
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