13.5.8.4 Verifying the re-trip mode
M12104-36 v6
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
=
Retrip Off
M12104-107 v7
1. Set RetripMode = Retrip Off.
2. Apply the fault condition, including initiation of CCRBRF (50BF), well above
the set current value.
3. Verify that no re-trip, but back-up trip is achieved after set time.
4. Disconnect AC and BFI_3P input signals.
Checking the re-trip with current check,
RetripMode
=
CB Pos Check
M12104-48 v7
1. Set RetripMode = CB Pos Check.
2. Apply the fault condition, including initiation of CCRBRF (50BF), 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 initiation of CCRBRF (50BF), with current
below set current value.
5. Verify that no re-trip and no back-up trip are obtained.
6. Disconnect AC and BFI_3P input signals.
Checking re-trip without current check
M12104-58 v9
1. Set RetripMode = No CBPos Check.
2. Apply the fault condition, including initiation of CCRBRF (50BF), 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 initiation of CCRBRF (50BF), 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 BFI_3P input signals.
13.5.8.5 Verifying the back-up trip mode
M12104-146 v5
In the cases below it is assumed that FunctionMode = Current is selected.
Checking that back-up tripping is not achieved at normal CB tripping
M12104-150 v8
Use the actual tripping modes. The case below applies to re-trip with current check.
1MRK 502 073-UUS A Section 13
Testing functionality by secondary injection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 203
Commissioning manual
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