Discussion
Over currents in a transformer affect:
Answer: D
Over currents affect All of the above.
Copper loss rises with the square of the current, so an over current raises the temperature of the windings and oil. Sustained high temperature degrades the paper and oil insulation and shortens insulation life. Large fault currents also produce electromagnetic forces between the windings, proportional to the square of the current, which cause mechanical stress and can deform them.
Each single option names a real effect, so none alone is complete.
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