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Which outcome occurs in a three-phase electrical transmission circuit experiencing a single line-to-ground fault?

A)Overvoltage on the unfaulted phases
B)Balanced current flow in all conductors
C)Harmonic resonance within the core
D)Reduced transformer core saturation

💡 Explanation

When a line-to-ground fault occurs, the voltage on the unfaulted phases rises due to the changing impedance caused by fault current flow, resulting in an overvoltage condition because of voltage imbalance. Therefore overvoltage results, rather than balanced current, resonance or reduced saturation which require symmetrical conditions.

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