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← TechnologyWhich outcome occurs when excessively high voltage impulses strike an ungrounded electrical power transformer's windings?
A)Core saturation decreases rapidly
B)Magnetostriction induced acoustic resonance
C)Insufficient inductive reactance occurs
D)Dielectric breakdown inside oil insulation✓
💡 Explanation
Dielectric breakdown occurs because exceeding the oil's insulation strength causes ionization and arc formation that punctures the insulation structure, therefore leading to internal flashover rather than lower impedance since the excess transient exceeds design tolerances.
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