6.
Apply input signal(s), for START of CCSRBRF. The value of current could
be low.
7.
Arrange disconnection of CB closed signal(s) well before set back-up trip
time
t2
.
8.
Verify that back-up trip is not achieved.
9.
Disconnect injected AC and START input signals.
10.4.7.7
Verifying the function mode
Curr&Cont Check
SEMOD128582-207 v3
To be made only when
FunctionMode
=
Current&Contact
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
SEMOD128582-211 v6
The operation shall be as in
FunctionMode
=
Current
.
Set
RetripMode
=
CB Pos Check
.
Procedure
1.
Set
FunctionMode
=
Current/Contact
.
2.
Leave the input for CB close inactivated. This signal should not influence.
Leave the inputs for CB close inactivated. These signals should not influence.
3.
Apply the fault condition, including START of CCSRBRF, with 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.
Checking the case with fault current below set value
SEMOD128582-227 v6
The case shall simulate a case where the fault current is very low and operation
will depend on CB position signal from CB auxiliary contact. It is suggested that
re-trip without current check is used; setting
RetripMode
=
No CBPos Check
.
Procedure
1.
Set
FunctionMode
=
Current/Contact
.
2.
Apply input signal for CB closed to relevant input CBCLD.Apply input
signal for CB closed to relevant input or inputs CBCLD.
3.
Apply the fault condition with input signal(s) for START of CCSRBRF. The
value of current should be below the set value
I>BlkCont
4.
Verify that re-trip (if selected) and back-up trip are achieved after set times.
Failure to trip is simulated by keeping the signal CB closed activated.Failure
to trip is simulated by keeping the signals CB closed activated.
5.
Disconnect the AC and the START signals. Keep the CB closed
signal.Disconnect the AC and the START signals. Keep the CB closed
signals.
Section 10
1MRK 505 372-UEN A
Testing functionality by secondary injection
104
Busbar protection REB670 2.2 IEC
Commissioning manual
