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.

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。

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Finally, based on calculating the protective range of lightning rod, the importance of using early streamer emission lightning rod in important project was explained.

最后通过避雷针保护范围的计算，说明了在重要工程中采用提前放电式避雷针的重要意义。

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Finally, based on calculating the protective range of lightning rod, the importance of using early streamer emission lightning rod in important project was explained.

最后通过避雷针保护范围的计算，说明了在重要工程中采用提前放电式避雷针的重要意义。

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