The ratio of voltage warp(RVW) for the varistor is defined to simulate a polynomial of every diameter and suspended heights of the grading ring.
定义了阀片电压偏差率并以此为目标函数，建立该目标函数与各均压环环直径和悬挂高度的拟合多项式关系。
The voltage distribution of several position combinations of the two grading rings is calculated and compared, and the best position combination is selected.
计算并对比两个屏蔽环多个位置组合的电压分布，选取最优的位置组合。
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