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Which outcome occurs when the primary insulation in oil-filled transformer fails?

A)Increased eddy current losses occur
B)Capacitance between windings declines
C)Dielectric breakdown propagation begins
D)Thermal convection within oil ceases

💡 Explanation

Dielectric breakdown propagation occurs because reduced insulation causes increased electric field strength, leading to ionization and cascading failure; therefore, breakdown develops, rather than eddy currents or reduced capacitance at the windings.

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