Answer / k.prakashchandra

I think DB is the marshalling box.If there is earth fault
or short circuit in CT secondaries of REFR core ,as the
balancing of currents is lost, there will be tripping.You
are advised to test the Tr for internal earth fault before
re-charging.The coneections of CT leads in the MB TB may be
firmly done with brass/copper bolts and nuts to avoid loose
connections.

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