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← TechnologyWhich outcome results when ground fault occurs in a distribution transformer's tertiary winding compensation circuit?
A)Inaccurate harmonic current mitigation
B)Transformer core saturation increases✓
C)Main breaker incorrectly trips offline
D)Increased capacitive excitation current
💡 Explanation
The DC magnetizing current increases because of the half-cycle asymmetry during ground fault, using the tertiary winding impedance. This leads to higher flux circulating within the core, therefore the transformer quickly saturates rather than mitigates harmonics due to insufficient impedance.
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