Which outcome occurs in a three-phase power distribution circuit subjected to an underbalanced fault?

A)Circulating zero-sequence current appears✓

B)Transformer core saturation decreases

C)Feeder voltage remains perfectly balanced

D)System frequency instantaneously collapses

💡 Explanation

When an underbalanced fault occurs, an imbalance of currents induces a zero-sequence current due to asymmetrical loading and grounding, flowing back to the source along the neutral path. Therefore zero-sequence current appears, rather than decreased saturation, balanced voltage, or frequency collapse, which need specific over-voltage and overload scenarios.

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Which outcome occurs in a three-phase power distribution circuit subjected to an underbalanced fault?

💡 Explanation

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