摘要
以某风电场集电线路雷电绕击杆塔为研究对象,采用 ATP-EMTP 软件建立集电线路雷击电磁暂态分析模型,对杆塔遭受雷击下集电线路耐雷水平进行分析,分别对未安装避雷器及杆塔底部安装避雷器的两种情况进行分析.结果表明,对于未安装避雷器的杆塔,其绕击耐雷水平较低,大幅值雷电流易引起三相同跳问题;对于安装有避雷器的杆塔,避雷器在一定程度上能提高导线绕击耐雷水平,同时给出相应的防护措施建议,为雷电发多地带风电场防雷保护提供技术参考.
Abstract
This paper conducted analyses on tolerance against shielding failure of an actual wind farm's collecting line pole without arrester and with arrester installed at the bottom,through the transient analytic model established using ATP-EMTP software.It is can be concluded that the pole without arrester has relatively low tolerance to shielding failure,as the lightning current with large amplitude easily causes three-phase simultaneous trip.And the installation of arrester can enhance to a certain extent the wires'resistance to lightning twining strike.The paper also gave advices on protective measures which may be helpful for wind farms located in frequent-lightning areas.
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