Verifying The Back-Up Trip Mode - ABB Relion 670 Series Installation And Commissioning Manual
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Section 15
Verifying settings by secondary injection
15.6.8.5
182
Checking the re-trip with current check,
1.
Set RetripMode = CB Pos Check.
2.
Apply the fault condition, including start of CCRBRF, well above the set
current value.
3.
Verify that re-trip is achieved after set time t1 and back-up trip after time t2
4.
Apply the fault condition, including start of CCRBRF, with current below set
current value.
5.
Verify that no re-trip, and no back-up trip is obtained.
6.
Disconnect AC and START input signals.
Checking re-trip without current check,
1.
Set RetripMode = No CBPos Check.
2.
Apply the fault condition, including start of CCRBRF, well above the set
current value.
3.
Verify that re-trip is achieved after set time t1, and back-up trip after time t2.
4.
Apply the fault condition, including start of CCRBRF, with current below set
current value.
5.
Verify that re-trip is achieved after set time t1, but no back-up trip is obtained.
6.
Disconnect AC and START input signals.
Verifying the back-up trip mode
In the cases below it is assumed that FunctionMode = Current is selected.
Checking that back-up tripping is not achieved at normal CB tripping
Use the actual tripping modes. The case below applies to re-trip with current check.
1.
Apply the fault condition, including start of CCRBRF, with phase current
well above set value IP.
2.
Arrange switching the current off, with a margin before back-up trip time, t2.
It may be made at issue of re-trip command.
3.
Check that re-trip is achieved, if selected, but no back-up trip.
4.
Disconnect AC and START input signals.
The normal mode BuTripMode = 1 out of 3 should have been verified in the tests
above. In applicable cases the modes 1 out of 4 and 2 out of 4 can be checked.
Choose the mode below, which corresponds to the actual case.
BuTripMode = 1 out of 4
Checking the case
It is assumed that the earth-fault current setting IN> is below phase current setting
IP>.
1MRK 502 029-UEN A
RetripMode = CB Pos Check
RetripMode = No CBPos Check
Installation and commissioning manual
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