Question

what are the advantage and disadvantage of Transformer feeder protection and its application​

Answer 1

Answer:

As the length of electrical power transmission line is generally long enough and it runs through open atmosphere, the probability of occurring fault in electrical power transmission line is much higher than that of electrical power transformers and alternators. That is why a transmission line requires much more protective schemes than a transformer and an alternator.

Protection of line should have some special features, such as-

During fault, the only circuit breaker closest to the fault point should be tripped.

If the circuit breaker closest to the faulty point, fails to trip, the circuit breaker just next to this breaker will trip as back up.

The operating time of relay associated with protection of line should be as minimum as possible in order to prevent unnecessary tripping of circuit breakers associated with other healthy parts of power system.

Explanation: