Discussion
Assertion (A): A current transformer's secondary must not be open circuited.
Reason (R): Without secondary ampere-turns the core saturates and a high voltage appears.
Select the correct option.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the mechanism. The primary current of a current transformer is set by the line, not by the transformer, so it continues regardless. With the secondary open there are no opposing ampere-turns, the whole primary magnetomotive force drives the core deep into saturation, and the flux changes so abruptly at each zero crossing that a dangerous voltage appears at the open terminals.
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