How many types of relay are present in a VCB and ACB, what
are the tests we can conduct on both breakers and how to
set the relays values
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Answer Posted / s naidu
in a vcb this are main relay
1-phase unbalance relay -2nos
2-earth leakege trip relay
3-TR common fault relay
in acb this are main relay
1-load balancing relay
2-u/o voltage relay
3-earth fault relay
4-master trip realy
this tests are carried out generally on both CB
i-cb in open & close position test
2-continuity of contacts
3-manual closing,electrical closing, remote closing
4-remote tripping though protection relays
5-check spring charging motors are in working
relays calibrated operating characteristics to electrical
circuits.
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