Checking The Re-Trip And Back-Up Times; Verifying The Re-Trip Mode - ABB ret650 Commissioning Manual

1MRK 504 126-UEN -
6.4.6.3
6.4.6.4
Commissioning Manual

Checking the re-trip and back-up times

The check of the set times can be made in connection with the check of operate
values above.
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)/1:CCRBRF.
1. Apply the fault condition, including start of CCRBRF, well above the set
current value. Measure time from START of CCRBRF.
2. Check the re-trip t1 and back-up trip times t2.
3. Disconnect AC and START input signals.

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)/1:CCRBRF.
Checking the case without re-trip,
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.
4. Disconnect AC and START input signals.
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 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,
1. Set RetripMode = No CBPos Check.
2. Apply the fault condition, including start of CCRBRF, without any current.
3. Verify that re-trip is achieved after set time t1, and back-up trip after time t2.
Testing functionality
RetripMode = Retrip Off
RetripMode = CB Pos Check
RetripMode = No CBPos Check
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