Which harmonic distortion effect increases due to core saturation in distribution transformers under light loading conditions?

💡 Explanation

When a transformer operates under light load, the core flux density increases due to reduced demagnetizing effect of the secondary current, causing saturation and nonlinear magnetizing current. This creates especially elevated third harmonic current because it is a primary component during saturation. Therefore excess third harmonic current results, rather than increased fifth harmonic voltages or harmonic reduction which require different imbalances.

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