Which risk increases when an electrical power transformer continually operates significantly below its rated load?

💡 Explanation

When a transformer operates lightly loaded, core magnetization current becomes a larger portion of the total current, thereby increasing harmonic distortion because the core operates over a non-linear range of its B-H curve. Therefore, harmonic distortion increases, rather than saturation, insulation degradation, or reduced compensation each requiring specific overload or fault types.

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