ABB Relion 670 series, Installation And Commissioning Manual

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Checking the re-trip with current check,
RetripMode = CB Pos 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,
RetripMode = No CBPos 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.
15.6.8.5 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.
Checking the case
BuTripMode = 1 out of 4
It is assumed that the earth-fault current setting IN> is below phase current setting
IP> .
Section 15
1MRK 502 029-UEN A
Verifying settings by secondary injection
182
Installation and commissioning manual