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1MRK 505 372-UEN Rev. K
The value of the incoming current for phase L1 shall correspond to the injected primary current.
The value of the differential current for phase L1 shall be negligible.
4.
Check that the current is present only in the phase being tested.
5.
Switch the current off.
6.
Check the function in phases L2 and L3 by injecting current in the same way.
In busbar arrangements where a disconnector replica is used, it provides the information to the
busbar protection about which of the measured CT currents shall be included within different
differential zones. It is necessary to verify the auxiliary contacts from each busbar disconnector.
Proper operation of this scheme have to be checked during commissioning, by manual operation of
the primary busbar disconnectors and/or circuit breakers and verification that the associated switch
status function block properly operates. Proper timing of the disconnector auxiliary contacts have to
be checked as well.
The protection scheme can be put in service after all these tests have been conducted.
Busbar protection REB670
Commissioning manual
For more information please refer to the REB670 application manual.
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Section 11
Primary injection testing
SEMOD65855-5 v3
145
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