Which risk increases when excessively frequent energization of a power transformer at slightly below 50°C ambient occurs?

💡 Explanation

Frequent energization, especially with temperature variation, induces mechanical stress on the transformer winding due to magnetostriction, thus causing cumulative fatigue. This leads to potential winding insulation cracking, because the mechanical vibrations weaken the insulation over time, therefore creating failure points, rather than alternatives like arc flash which relate to other overvoltage causes.

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