Dianci bileiqi为了研究高压单芯电缆金属护套冲击电压的影响因素，本研究用PSCAD/EMTDC建立220 kV架空线-高压单芯电缆线路模型并仿真雷电绕击架空线后沿线入侵电缆的波过程，在工频运行条件下，通过改变电缆接地方式、电缆参数以及雷电流参数，研究对金属护套雷电冲击电压幅值的降低作用。结果表明：其他条件相同时，采用首端接地方式的不接地点金属护套雷电冲击电压幅值比末端接地方式和交叉互联接地方式降低约90 %；由于金属护套在交叉互联点发生换位，导致金属护套雷电冲击电压幅值最大相在第二个互联点处由侵入相变为非侵入相 ...
孙铭, 张周胜, 谢书凝, 张磊
doaj
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Dianci bileiqi多腔室并联间隙具有响应速度快、灭弧性能良好、能有效抑制雷电冲击对电网设备的影响等优点，可作为配网线路防雷措施的补充。多腔室并联间隙不同于普通并联间隙，其雷电冲击闪络路径复杂，装置整体放电特性掌握不全面，难以对放电间隙进行合理设置，而放电间隙设置不当会造成雷电冲击闪络定位失败，导致电弧灼烧绝缘子。为研究多腔室并联间隙的雷电冲击闪络定位条件，本文仿真分析了多腔室灭弧结构的电场非均匀性，根据仿真结果提出将多腔室灭弧结构等效为棒-棒空气间隙；并进一步开展了多腔室灭弧结构的雷电冲击闪络试验 ...
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