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Within three-phase power grid transformers, which failure results from repeated breaker operation?

A)Reduced transformer winding insulation life
B)Increased core hysteresis energy losses
C)Decreased transformer oil's dielectric strength
D)Elevated circulating eddy current magnitudes

💡 Explanation

Transient voltage stress reduces transformer insulation life because repeated breaker operations induce voltage surges and harmonics. This is Dielectric Degradation, therefore insulation degrades, rather than core losses increasing due or oil's dielectric properties being changed under normal conditions.

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