10.5.7.5 Verifying instantaneous back-up trip at CB faulty condition
M12104-197 v7
Applies in a case where a signal from CB supervision function regarding CB being
faulty and unable to trip is connected to input CBFLT.
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 the START of CCRWRBRF, with the
current above the set current value.
4. Verify that back-up trip is obtained without intentional delay (i.e. independent
of set time delay of t2).
10.5.7.6 Verifying the case
FunctionMode
=
Contact
M12104-213 v10
It is assumed that re-trip without current check is selected, FunctionMode =
Contact.
1. Set FunctionMode = Contact
2. Apply the input signal for CB closed to the relevant input or inputs
CBCLDL1 or CBCLD2.
3. Apply the input signal START of CCRWRBRF.
4. Verify that the re-trip and back-up trip are achieved after set times.
5. Disconnect the start signal. Keep the CB closed signal(s).
6. Apply the input signal START of CCRWRBRF.
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.
10.5.7.7 Verifying the function mode
Current/Contact
M12104-237 v6
To be made only when FunctionMode = Current/Contact is selected.
Checking the case with fault current above set value
IP>
M12104-241 v7
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 the START of CCRWRBRF, with the
current above the set IP> value.
4. Check that the re-trip, if selected, and back-up trip commands are achieved.
1MRK 506 377-UEN C Section 10
Testing functionality by secondary injection
Railway application RER670 2.2 IEC 117
Commissioning manual
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