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← TechnologyWhich consequence results when rapid de-energization occurs in a large power transformer?
A)Harmonic resonance forms across circuits
B)Inrush current stresses other units
C)Ferranti effect causes voltage rise✓
D)Dielectric breakdown damages insulation
💡 Explanation
The *Ferranti effect* causes voltage rise as a result of the distributed capacitance charging because the far end of long unloaded or lightly loaded lines see high voltage. Therefore a high-voltage condition results rather than voltage sag on the line or damage to the transformer.
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