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

A)Dielectric breakdown of winding insulation✓

B)Core saturation due to excessive magnetizing current

C)Mechanical resonance amplifying vibrations

D)Harmonic distortion affecting power quality

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

💡 Explanation

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