Overcurrent protection for transformers requires special consideration due to the magnetizing inrush current on which winding?

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Multiple Choice

Overcurrent protection for transformers requires special consideration due to the magnetizing inrush current on which winding?

Explanation:
When a transformer is energized, the magnetizing inrush current flows to establish the core flux, and this surge is seen primarily in the primary winding. It is a temporary, very large current that can exceed the normal load by several times, even with no load on the secondary. Because protection schemes must avoid tripping on this harmless inrush while still responding to actual faults, the primary winding behavior during energization is the key factor. The secondary current relates to load or faults reflected from the secondary, not to the inrush that occurs when energizing the transformer.

When a transformer is energized, the magnetizing inrush current flows to establish the core flux, and this surge is seen primarily in the primary winding. It is a temporary, very large current that can exceed the normal load by several times, even with no load on the secondary. Because protection schemes must avoid tripping on this harmless inrush while still responding to actual faults, the primary winding behavior during energization is the key factor. The secondary current relates to load or faults reflected from the secondary, not to the inrush that occurs when energizing the transformer.

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