Which consequence results when a three-phase autotransformer's tertiary winding breaker trips carrying unbalanced fault current?

💡 Explanation

Tripping of the tertiary winding breaker during unbalanced fault conditions causes increased circulating harmonic currents because the tertiary winding, acting as a delta connection, is no longer able to suppress zero-sequence currents. Therefore, harmonic current distortions rise rather than core saturation lessening.

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