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← ScienceWhich 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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