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Section 11
Testing functionality by secondary injection
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.
11.5.9.9
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.
11.5.9.10
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.
1.
Set FunctionMode = Current or CB Pos.
2.
Apply input signal for CB closed to the 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>BlkCBPos.
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 input signal 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>BlkCBPos.
7.
Arrange disconnection of CB 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
RetripMode = Always.
174
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1MRK 504 165-UEN Rev. K
M12104-213 v10
M12104-237 v7
M12104-241 v8
M12104-281 v11
Transformer protection RET670
Commissioning manual
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