Which risk increases when an electrical power transformer is subjected to frequent inrush currents due to repetitive energization?

💡 Explanation

When a transformer experiences frequent inrush currents, magnetostriction induces mechanical stresses cause cumulative weakening the insulation, ultimately leading to premature insulation failure. Therefore insulation degradation increases due to mechanical forces, rather than harmonic losses, adhesive breakdown, or fluid breakdown which involve different aging mechanisms.

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