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,
Can u pls explain the basics for selection of DC voltage for substation used for control and protection applications, i came across 30V, 110V, 125V and 220 volts level, breaker manufacturer will supply closing and tripping coils according to our request, and most of the numerical protection...
