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← TechnologyWhich condition can cause ferroresonance in a three-phase power transformer connected to unloaded cables?
A)Harmonic distortion within the neutral conductor
B)Single-phase switching during light load✓
C)Overvoltage due to lightning strikes
D)Increased core saturation from DC bias
💡 Explanation
When single-phase switching occurs during lightly loaded conditions, the circuit's non-linear magnetizing inductance resonates with cable capacitance causing ferroresonance. Therefore, single-phase switching can lead to the described condition rather than harmonic distortion, overvoltage, or DC bias, requiring alternative causes.
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