Negative sequence relay is used commonly to protect Negative sequence

| Negative sequence relay is used commonly to protect

A. An alternator

B. A transformer

C. A transmission line

D. A bus bar

Right Answer is: A

SOLUTION

Negative sequence currents gives rise to another rotating magnetic field in the generator in opposite direction which leads to excessive copper loss and pulsation in electromagnetic torque, which causes mechanical stress on the shaft of the alternator. So negative sequence relay is commonly used to protect alternator.

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