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1MRK 505 372-UEN Rev. K
1.
Apply the fault condition, including START of CCSRBRF, with phase current well above set
value IP>.
2.
Arrange switching the current off, with a margin before back-up trip time, t2. It may be made at
issue of re-trip command.
3.
Check that re-trip is achieved, if selected, but no back-up trip.
4.
Disconnect AC and start input signals.
10.4.7.6
Verifying instantaneous back-up trip at CB faulty condition
Applies in a case where a signal from CB supervision function regarding CB being faulty and unable
to trip is connected to input CBFLT.
Procedure
1.
Repeat the check of back-up trip time. Disconnect current and START input signals.
2.
Activate the input CBFLT. The output CBALARM (CB faulty alarm) should appear after set time
tCBAlarm. Keep the input activated.
3.
Apply the fault condition, including START of CCSRBRF, with current above set current value.
4.
Verify that back-up trip is obtained without intentional delay, for example, within 20ms from
application of START.
5.
Disconnect injected AC and input signals.
10.4.7.7
Verifying the case FunctionMode = CB Pos
It is assumed that re-trip without current check is selected, RetripMode = UseFunctionMode.
1.
Set FunctionMode = CB Pos
2.
Apply input signal for CB closed to relevant input CBCLD.
3.
Apply the START input signal for the start of CCSRBRF. The value of current can be low.
4.
Verify that phase selection re-trip and backup trip are achieved after set times.
5.
Disconnect the START signal. Keep the CB closed signal.
6.
Apply START input signal, for start of CCSRBRF. The value of current can be low.
7.
Arrange disconnection of CB closed signal before set backup trip time t2.
8.
Verify that backup trip is not achieved.
9.
Disconnect injected AC and START signal.
10.4.7.8
Verifying the case FunctionMode = Current or CB Pos
To be made only whenFunctionMode = Current or CB Pos is selected. It is suggested to make the
tests in one phase only, or at three-phase trip applications for just three-phase tripping.
Checking the case with fault current above set value IP>
The operation shall be as in RetripMode = UseFunctionMode.
Procedure
1.
Set FunctionMode = Current or CB Pos.
2.
Leave the inputs for CB close inactivated. That signal should not influence.
3.
Apply the fault condition, including the start of CCSRBRF, with the current above the set IP>
value.
4.
Check that the re-trip, if selected, and back-up trip commands are achieved.
5.
Disconnect injected AC and START input signals.
Busbar protection REB670
Commissioning manual
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Section 10
Testing functionality by secondary injection
SEMOD128582-167 v5
GUID-B7B9D78C-B660-4E1D-A27E-EF45B542C5E2 v1
GUID-E9854053-8E90-430A-B788-993E1706CE33 v1
GUID-91453035-A2A6-42EF-B580-D2AA1C4A8810 v1
91
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