1.
Set
FunctionMode
=
Contact
2.
Apply input signal for CB closed to input CBCLDL1, CBCLD2 or CBCDL3.
3.
Apply input signal, for start of CCRBRF.
4.
Verify that phase selection re-trip and back-up trip are achieved after set times.
5.
Disconnect the start signal. Keep the CB closed signal.
6.
Apply input signal, for start of CCRBRF.
7.
Arrange disconnection of CB closed signal 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.
6.5.5.7
Verifying the function mode
Current&Contact
To be made only when
FunctionMode
=
Current&Contact
is selected.
Checking the case with fault current above set value
IP>
The operation shall be as in
FunctionMode
=
Current
.
1.
Set
FunctionMode
=
Current&Contact
.
2.
Leave the inputs for CB close inactivated. These signals should not influence.
3.
Apply the fault condition, including start of CCRBRF, 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
I>BlkCont
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
.
1.
Set
FunctionMode
=
Current&Contact
.
2.
Apply input signal for CB closed to relevant input or inputs CBCLDL1 (2 or 3)
3.
Apply the fault condition with input signal(s) for start of CCRBRF. The value of
current should be below the set value
I>BlkCont
4.
Verify that phase selection re-trip (if selected) and back-up trip are achieved
after set times. Failure to trip is simulated by keeping the signal(s) CB closed
activated.
5.
Disconnect the AC and the START signal(s). Keep the CB closed signal(s).
6.
Apply the fault and the start again. The value of current should be below the set
value
I>BlkCont
.
7.
Arrange disconnection of BC closed signal(s) well before set back-up trip time
t2
. It simulates a correct CB tripping.
8.
Verify that back-up trip is not achieved. Re-trip can appear for example, due to
selection “Re-trip without current check”.
9.
Disconnect injected AC and START input signals.
Section 6
1MRK 502 049-UEN A
Testing functionality
72
Commissioning manual
