Choose the applicable function and trip mode, such as FunctionMode = Current and
setting RetripMode = No CBPos. Check as set under Main menu/Settings/IED Settings/
Current/CCRBRF(50BF)/CCRBRF:1.
1. Apply the fault condition, including initiation of CCRBRF (50BF), well above the
set current value. Measure time from INITIATION of CCRBRF (50BF).
2. Check the re-trip t1 and back-up trip times t2.
3. Disconnect AC and INITIATE input signals.
6.3.9.4 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 as set under Main menu/
Settings/IED Settings/Current/CCRBRF(50BF)/CCRBRF:1.
Checking the case without re-trip,
RetripMode
=
Retrip Off
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 INITIATE input signals.
Checking the re-trip with current check,
RetripMode
=
CB Pos Check
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 is obtained.
6. Disconnect AC and INITIATE input signals.
Checking re-trip without current check,
RetripMode
=
No CBPos Check
1. Set RetripMode = No CBPos Check.
2. Apply the fault condition, including initiation of CCRBRF (50BF), without any
current.
3. Verify that re-trip is achieved after set time t1, and back-up trip after time t2.
1MRK 505 293-UUS A Section 6
Testing functionality
61
Commissioning manual
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