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← TechnologyWhich risk increases when thermal runaway occurs within distribution transformer's oil bath?
A)Catastrophic magnetic core saturation occurs
B)Accelerated dielectric breakdown appears✓
C)Impaired tap changer functionality results
D)Increased winding skin effect develops
💡 Explanation
Accelerated dielectric breakdown appears because thermal runaway intensely heats the insulating oil, initiating pyrolysis and bubble formation via dissolved gases; these vapor bubbles quickly decrease the oil's original insulating strength, therefore a dielectric breakdown is more probable, rather than impacting core saturation directly.
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