Why do we require additional REF on star connected windings of transfo
Why do we require additional REF on star connected windings of transfo
(OP)
Transformer differential protection will operate for LL and LG faults within transfomer, then y we need a additional REF protection for star connected winding, in addition there is another neutral overcurrent relay,






RE: Why do we require additional REF on star connected windings of transfo
RE: Why do we require additional REF on star connected windings of transfo
In additional, if your grounding is resistance or compensated, REF is storngly recommended function.
Best Regards.
Slava
RE: Why do we require additional REF on star connected windings of transfo
87T doesn't cover 100% of the star winding, this is why we add REF to cover 100% of the star winding in case of L-G faults.
thanx
SMB
RE: Why do we require additional REF on star connected windings of transfo