1.
Apply the fault condition, including START of CCRBRF, with a current below the set
IP>.
2.
Repeat the fault condition and increase the current in steps until a trip occurs. Note that
the START signal shall be re-applied for each new current value.
3.
Compare the result with the set
IP>.
If
No CBPos Check or Retrip off is set, only back-up trip can be used to check
set
IP>.
9.3.7.2
Checking the residual (earth fault) current operate value
IN> set below
IP>
M12104-80 v10
Check the low set
IN> current where setting FunctionMode = Current and setting BuTripMode
=
1 out of 4
1.
Apply the fault condition, including START of CCRBRF, with a current just below set
IN>.
2.
Repeat the fault condition and increase the current in steps until trip appears. Note that
the START signal shall be re-applied for each new current value.
3.
Compare the result with the set
IN>.
4.
Disconnect AC and START input signals.
9.3.7.3
Checking the re-trip and back-up times
M12104-93 v12
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
RetripMode = UseFunctionMode.
1.
Apply the fault condition, including start of CCRBRF, well above the set current value.
Measure the time from START of CCRBRF.
2.
Check the re-trip
t1 and back-up trip times t2 and t3.
In applicable cases, the back-up trip for multi-phase start
t2MPh and back-up trip 2, t2
and
t3 can also be checked. To check t2MPh, a two-phase or three-phase start shall be
applied.
9.3.7.4
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 v8
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,
RetripMode = CB Pos Check
M12104-48 v8
1MRK 505 385-UEN C
Section 9
Testing functionality by secondary injection
Breaker protection REQ650
67
Commissioning manual
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