Only in each column over-voltage protector installed on each phase can get good protection effect.
只有在每柱每相上安装过电压保护器才能得到好的保护效果。
Over-voltage protector can be greatly reduced near lightning flashover rates caused by induction voltage.
过电压保护器可以大大降低附近雷击感应电压导致的闪络率。
Calculation results show that the density of over-voltage protector increase, reduce the induced over-voltage.
计算结果表明，过电压保护器的密度增加，感应过电压降低。
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