Which outcome occurs when a three-phase transformer's primary winding develops an open-circuit fault on one phase?

💡 Explanation

When one phase of a delta- or wye-connected primary winding opens, the resulting current imbalance and voltage distortion causes output unbalance and harmonic distortion because the symmetrical three-phase currents are no longer maintained. Therefore output unbalance and harmonic distortion results, rather than core saturation, reactive power increase or breaker trips which require different triggers.

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