With being higher the voltage and varying of transmission line structure, the calculation method of lighting trip-out rates should be improved continually.

随着电压等级的提高及线路结构的变化，输电线路雷击跳闸率计算法也不断地改进。

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Higher-voltage transmission lines that have become more common in recent years are intrinsically more susceptible to upset, and those lines are largely concentrated in the manufacturing centers of the Midwest.

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