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1MRK 505 378-UEN Rev. K
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 CCRBRF, 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.
11.5.8.8
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 or inputs CBCLDL1, CBCLD2 or CBCDL3.
3.
Apply the input signal, or signals for the start of CCRBRF.
4.
Verify that phase selection re-trip and backup trip are achieved after set times.
5.
Disconnect the start signal(s). Keep the CB closed signal(s).
6.
Apply input signal(s), for start of CCRBRF.
7.
Arrange disconnection of CB closed signal(s) well before set backup trip time t2
8.
Verify that backup trip is not achieved.
11.5.8.9
Verifying the case RetripMode = Contact
It is assumed that re-trip without current check is selected, RetripMode = Contact.
1.
Set FunctionMode = Contact
2.
Apply input signal for CB closed to relevant input or inputs CBCLDL1, CBCLD2 or CBCDL3.
3.
Apply the input signal, or signals for the start of CCRBRF.
4.
Verify that phase selection re-trip and back-up trip are achieved after set times.
5.
Disconnect the start signal(s). Keep the CB closed signal(s).
6.
Apply input signal(s), for start of CCRBRF.
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.
11.5.8.10
Verifying the caseFunctionMode = 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.
1.
Set FunctionMode = Current or CB Pos.
2.
Leave the inputs for CB close inactivated. These signals should not influence.
3.
Apply the fault condition, including the start of CCRBRF, with the current above the set IP>
value.
4.
Check that the re-trip, if selected, and back-up trip commands are achieved.
Checking the case with fault current below set value I>BlkCBPos
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 retrip without current check is used,
setting RetripMode = UseFunctionMode Check.
Line differential protection RED670
Commissioning manual
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Section 11
Testing functionality by secondary injection
GUID-06D1545D-31F7-4B48-821E-151212962A81 v1
M12104-213 v10
M12104-281 v11
M12104-237 v7
M12104-241 v8
167
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