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Section 10
Testing functionality by secondary injection
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.
Procedure
1.
Set FunctionMode = Current or CB Pos.
2.
Apply input signal for CB closed to the input CBCLD.
3.
Apply the fault condition with START input signal for start of CCSRBRF. The value of current
should be below the set value I>BlkCBPos.
4.
Verify that retrip (if selected) and backup trip are achieved after set times. Failure to trip is
simulated by keeping the signal CB closed activated.
5.
Disconnect the input signal and the START signal. Keep the CB closed signal.
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 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.
10.4.7.9
Verifying the external start signal has timed out
1.
Set StartMode = FollowStart.
2.
Set FunctionMode = Current.
3.
Use default value for tStartTimeout = 1.0 s.
4.
Use default value for time delay backup trip t2 = 0.150 s.
5.
Leave the inputs for CB close inactivated. These signals should not influence.
6.
Apply START signal, and after 1.5 s apply the current above the set IPh> value.
7.
Check that STALARM signal is set after 1.0 s and backup trip is blocked.
10.4.7.10
Verifying that backup signal is released when STALARM is reset
1.
Set StartMode = FollowStart.
2.
Set FunctionMode = Current.
3.
Use default value for tStartTimeout = 1.0 s.
4.
Use default value for time delay backup trip t2 = 0.150 s.
5.
Leave the inputs for CB close inactivated. These signals should not influence.
6.
Apply START signal at t=0s, and after 1.5 s apply the current above the set IPh> value.
7.
Check that STALARM signal is set after 1.0s and backup trip is blocked.
8.
Reset START signal after 3.5s, ensure that STALARM reset immediately.
9.
Set START after 3.6s, ensure that backup trip is set after t2 backup trip delay has expired
(3.750 s).
10.4.7.11
Test of FollowStart&Mode behaviour
1.
Set StartMode = FollowStart&Mode.
2.
Set FunctionMode = Current.
3.
Set RetripMode = UseFunctionMode.
4.
Use default value for tStartTimeout = 1.0 s.
5.
Use default value for time delay backup trip t2 = 0.150 s.
6.
Use default value for time delay re-trip t1 = 0.000 s.
92
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1MRK 505 372-UEN Rev. K
GUID-2CB55012-14AE-4243-B5ED-0959FA3CB39E v1
GUID-754108D4-E440-4F8F-917B-04579EC1C2C7 v1
GUID-49CA34B6-5AE9-4E45-9F4E-33DA5F626209 v1
GUID-D68675FC-2533-4D6F-A26B-E1611FB7B32A v1
Busbar protection REB670
Commissioning manual
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