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← TechnologyWhich risk increases when temperature significantly exceeds a power transformer's design limit, and the built-in protection breaker fails?
A)Overcurrent tripping becomes intermittent
B)Insulation breakdown accelerates exponentially✓
C)Core saturation risk reduces sharply
D)Tap changer functionality gets enhanced
💡 Explanation
Insulation degradation accelerates because thermal runaway overwhelms cooling leading to dielectric failure by bond breakage rather than controlled energy dissipation. Therefore risk increases; rather than overcurrent alone, a catastrophic failure could ensue if the protection breaker fails.
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