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← TechnologyWhich hazard increases in a three-phase AC power distribution circuit due to sustained harmonic distortion?
A)Resonant oscillations in transmission lines
B)Overheating of neutral conductor✓
C)Increased corona discharge on insulators
D)Failure of transformer core lamination
💡 Explanation
When harmonic distortion is sustained in three-phase AC power, the tripled odd harmonics (3rd, 9th, 15th) currents are produced, flowing additively in the neutral conductor because of their phase relationship which raises ampacity demand. Overheating of the neutral conductor therefore results, instead of oscillations, discharge, or core failure which arise from other electrical anomalies.
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