12.5.10.1
Checking the phase current operate value IP>
SEMOD128582-25 v6
Procedure
1.
Apply the fault condition, including START of CCSRBRF, with a current below set
IP>.
2.
Repeat the fault condition and increase the current in steps until a trip occurs.
3.
Compare the result with the set
IP>.
4.
Disconnect the AC and start input signals.
Note! If “
No CBPos Check” or “Retrip off” is set, only back-up trip can be
used to check set
IP>.
12.5.10.2
Checking the re-trip and back-up times
SEMOD128582-54 v5
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
FunctMode = Current and RetripMode =
CB Pos Check .
Procedure
1.
Apply the fault condition, including START of CCSRBRF, well above the set current value.
Measure time from “Start of CCSRBRF”.
2.
Check the re-trip
t1 and back-up trip times t2 and t3
3.
Disconnect AC and start input signals.
12.5.10.3
Verifying the re-trip mode
SEMOD128582-67 v2
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
SEMOD128582-71 v5
Procedure
1.
Set
RetripMode = Retrip Off.
2.
Apply the fault condition, including START of CCSRBRF, 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,
RetripMode = CB Pos Check
SEMOD128582-83 v4
Procedure
1.
Set
RetripMode = CB Pos Check .
2.
Apply the fault condition, including START of CCSRBRF, well above the set current value.
3.
Verify that retrip is achieved after set time
t1 and back-up trip after time t2
4.
Apply the fault condition, including START of CCSRBRF, 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,
RetripMode = No CBPos Check
SEMOD128582-99 v5
Procedure
1MRK 502 067-UEN B
Section 12
Testing functionality by secondary injection
169
Commissioning manual
