Which operational risk increases with prolonged operation of a power transformer under highly reactive loads?

💡 Explanation

When transformers operate with highly reactive loads, increased current harmonics circulate because non-sinusoidal waveforms induce additional eddy currents in the winding conductors, increasing heat. Therefore, excessive eddy currents and heat increase winding losses, rather than lamination degradation, tap changer wear, or oil breakdown, which involve different operational stressors.

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