Which outcome is most probable when a three-phase power transformer system experiences sustained unbalanced loading?

💡 Explanation

When unbalanced loading persists, uneven current distribution generates localized hotspots and stray flux because currents do not fully cancel, leading to core saturation and overheating. Therefore, increased thermal stress arises because core heats, rather than resonance, oil breakdown or voltage sag which would require specific external factors or different mechanisms.

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