Which limitation arises when a delta-wye transformer bank supplying a balanced three-phase load experiences a single-phase transformer failure?

💡 Explanation

When a single transformer fails, the remaining transformers operate in an open-delta configuration, because of reduced redundancy which causes load imbalance, and reduces the overall kVA capacity to roughly 57.7% of the original. Therefore a derated capacity with load imbalance results, rather than only voltage drop, harmonic increase, or shutdown, which all demand different imbalances or major faults.

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