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1MRK 505 372-UEN Rev. K
1.
Apply the fault condition, including start of CCRBRF, well above the set current value. Measure
the time from START of CCRBRF.
2.
Check the re-trip t1 and back-up trip times t2 and t3.
In applicable cases, the back-up trip for multi-phase start t2MPh and back-up trip 2, t2 and t3
can also be checked. To check t2MPh, a two-phase or three-phase start shall be applied.
10.4.6.5
Verifying the re-trip mode
Choose the mode below, which corresponds to the actual case.
In the cases below it is assumed that FunctionMode = Current is selected.
Checking the case without re-trip, RetripMode = Off
1.
Set RetripMode = Off.
2.
Apply the fault condition, including start of CCRBRF, well above the set current value.
3.
Verify that no re-trip, but back-up trip is achieved after set time.
Checking the re-trip with current check, RetripMode = UseFunctionMode
1.
Set RetripMode = UseFunctionMode.
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 the start of CCRBRF, with the current below the set current
value.
5.
Verify that no re-trip, and no back-up trip is obtained.
Checking re-trip without current check
1.
Set RetripMode = Always.
2.
Apply the fault condition, including start of CCRBRF, well above the set current value.
3.
Verify that re-trip is achieved after the set time t1, and the 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.
10.4.6.6
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.
Interrupt the current, 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 is obtained.
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>.
Busbar protection REB670
Commissioning manual
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Section 10
Testing functionality by secondary injection
M12104-36 v6
M12104-107 v8
M12104-48 v8
M12104-58 v10
M12104-146 v5
M12104-150 v8
M12104-165 v6
85
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