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Which outcome occurs when a three-phase power transformer in a distribution system experiences single-phase isolation?

A)Harmonic current injection into the grid
B)Increased power factor across all phases
C)Balanced voltage distribution to all users
D)Reduced skin effect in transmission lines

💡 Explanation

When single-phasing occurs due to a blown fuse or line break, unbalanced currents flow, because third-order harmonics are generated, causing harmonic current injection into the grid. Therefore, harmonic distortion increases, rather than improved power factor, balanced voltage, or decreased skin effect which require balanced conditions.

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