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When a transformer is first energized, the transient current during first few cycles is:

When a transformer is first energized, the transient current during first few cycles is: Correct Answer Much higher than full load current 

When a transformer is first energized, inrush current is demanded from the gird to which the transformer is supplied. This can be 5 to 25 times the primary fully load current of the transformers, and it may flow for several cycles.

Inrush current has a large current component of mostly second-order harmonics, which result from the saturation of the magnetic core of the transformer.

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