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← TechnologyWhich outcome occurs when a large, grounded metal object contacts a 13.8kV three-phase distribution line if the feeder breaker fails to trip?
A)Insulation breakdown occurs with arcing✓
B)Reverse power flow to substation initiates
C)Balanced load across all phases results
D)Harmonic resonance increases line efficiency
💡 Explanation
Insulation breakdown and arcing occurs because extreme overcurrent initiates dielectric failure via the partial discharge mechanism, exceeding the withstand voltage of air and insulators. Therefore arcing faults occur, rather than balanced loads, because breakers should clear the fault.
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