电感型避雷针防雷机理研究

来源 :中国电机工程学会高电压专业委员会2015年学术年会 | 被引量 : 0次 | 上传用户:mars8244
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  雷击是导致输电线路跳闸的主要原因,新的防雷机理及防雷措施一直是国内外研究热点和难点。本文针对以降低雷电流陡度和幅值进而降低雷害事故的电感型避雷针开展了有限元分析、电磁暂态分析和滤波特性分析,以探索其防雷机理并评价其防雷效果。基于有限元分析建立了考虑电感型避雷针电感参数及分布电容参数的链式等效电路模型,并探索了等效电感和电容参数的影响因素。基于PSCAD/EMTDC 电磁暂态程序建立了输电线路耐雷性能仿真模型,仿真对比了塔顶是否安装及安装电感型避雷针参数不同时对耐雷水平的影响,并通过改变其等效电路L、C 参数获得了其对反击耐雷水平影响的三维曲面图及等高线图,明确了防雷效果。同时,结合频谱分析和电磁暂态仿真研究了加装电感型避雷针后其等效电路参数L、C 对雷电流频谱特性和绝缘子两端电压的影响,从频谱特性及滤波器角度进一步解释了电感型避雷针的防雷机理。
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