Which outcome occurs when a three-phase distribution transformer lacks appropriately sized secondary circuit breakers during a single-phase fault?

💡 Explanation

When a single-phase fault occurs without adequate secondary breakers, voltage imbalance results because only one phase current increases dramatically, causing a flux imbalance and overfluxing of the transformer core. Therefore over-fluxing arises, rather than harmonic distortion, bearing damage or total collapse, which require symmetrical overload behavior within the distribution grid.

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