Which risk increases when a three-phase power distribution transformer bank experiences an open-delta configuration?

💡 Explanation

When a transformer bank operates in an open-delta configuration instead of a closed delta, it results in reduced kVA capacity (typically 57.7% of the closed-delta configuration) and increased voltage imbalance due to unequal impedance on each phase. Therefore reduced capacity and voltage imbalance results, rather than harmonics, saturation or breakdown which require unique additional stressors.

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