Verifying The Back-Up Trip Mode - ABB rec670 Commissioning Manual
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1MRK 511 360-UEN A
10.4.9.5
Bay control REC670 2.1 IEC
Commissioning manual
Testing functionality by secondary injection
1.
Set RetripMode = Retrip 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,
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 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 = 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 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.
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.
BuTripMode = 1 out of 4
Checking the case
It is assumed that the earth-fault current setting IN> is below phase current setting
IP>.
Section 10
RetripMode = CB Pos Check
101
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