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电网技术  2011 

铁塔横担侧向避雷针的绕击保护效果分析

, PP. 169-177

Keywords: 侧向避雷针,绕击,横担,杆塔,保护范围,电气几何模型,防雷

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Abstract:

为评估在杆塔横担上安装侧向避雷针的防雷电绕击效果,提出建立三维的电气几何模型,计算侧向避雷针对导线的绕击保护距离,并总结了其安装和使用的规律。针对110~500kV典型杆塔线路的计算表明侧向避雷针能较好地保护杆塔附近的重点绕击危险区域,从而可以有效地降低线路的绕击跳闸率。研究还表明,侧向避雷针对导线的保护效果会受到针杆长度和安装位置的影响,针杆的长度应大于2m,并且尽量架设在避雷线保护角较大的导线横担上。实际工程的运行经验表明,侧向避雷针确实可以在输电线路上起到较好的防雷效果,其有效性已得到证明。因此,对于雷害严重的高杆塔、山区输电线路,在杆塔的横担上安装侧向避雷针是线路防绕击治理的有效途径。

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