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Thanks to all for their valuable reply

Thanks to all for their valuable reply

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,

I dont think any problem in using Low impedance protection for busbar protection, For multiple bus configuration we must go for LI protection, if we use HI protection, we have to switch the CT circuit, which may lead to mal operation of protection if there is any failure in swtching, IF we use...

Normally large capacity motors will have star winding to have a differential protcection for its windings to minimize the effect of fault. Mr,Mnewman already explained that delta conneted winding of same motor will produce more torque than star connected winding. A six lead motor can be...

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...