Which risk disproportionately increases during prolonged single-phasing in a three-phase distribution transformer bank?

💡 Explanation

When single-phasing occurs, the remaining transformers supply the load, causing unbalanced currents and flux asymmetry, leading to localized core saturation and increased hysteresis losses. Therefore, core overheating results, rather than elevated harmonics, dielectric stress, or noise reduction, which derive from different power system faults.

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