线路避雷器仅能保护安装了线路避雷器的杆塔自身的线路绝缘子（串）不发生雷击闪络，无外延的雷击保护范围。
The line arresters can only protect the line insulators on the tower equipped with the line arresters from lightning flash and they have no extended protective range.
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。
Over-voltage protector can be greatly reduced near lightning flashover rates caused by induction voltage.
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