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← TechnologyWhich outcome occurs when overcurrent causes excessive *I²R* heating in power transformer's winding circuit?
A)Polymer impregnation breakdown accelerates✓
B)Hysteresis losses greatly diminish
C)Eddy current loops start oscillating
D)Core saturation point significantly drops
💡 Explanation
Polymer impregnation failure accelerates because *I²R* heating increases temperature, which lowers the dielectric strength through thermal runaway; therefore the polymer degrades rapidly rather than the magnetic core properties being immediately affected. Its breakdown then leads to shorts.
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