Which risk increases when an electrical power distribution transformer operates continuously above its nameplate kVA rating?

💡 Explanation

When a transformer operates above its kVA rating, increased current causes overheating because of I^2R losses in windings which degrades the dielectric properties of the insulation leading to breakdown. Therefore dielectric breakdown risk increases, rather than core saturation, resonance, or harmonic distortion which require different operational conditions or triggering events.

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