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Which risk significantly escalates when three-phase power transformer breakers are tripped sequentially in a multi-transformer distribution network?

A)Overvoltages from the Ferranti effect
B)Increased eddy current losses
C)Higher skin effect resistance
D)Reduced dielectric breakdown margin

💡 Explanation

Overvoltages from the Ferranti effect become significant because sequential breaker operation interrupts inductive current unevenly, exciting resonant frequencies in transmission lines; therefore, voltage will increase, rather than alternative behaviors within the transformer itself due to the delayed disconnection.

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