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输电线路导线覆冰模拟计算与试验研究

DOI: 10.13334/j.0258-8013.pcsee.2014.S.036, PP. 246-255

Keywords: 输电线路,导线,覆冰,影响因素,覆冰强度,局部碰撞率,模拟计算

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Abstract:

输电线路覆冰后,将引发断线倒塔事故,严重威胁电网的安全运行。其覆冰受气温、风速、水滴直径和导线结构的影响,为研究这些因素影响导线覆冰的规律,在导线覆冰理论计算研究的基础上,利用有限元软件二次开发功能,编制了导线覆冰过程中过冷却水滴碰撞导线的数值模型,该模型将反馈的两随机水滴位置插值到网格节点上,最终获得过冷却水滴局部碰撞位置,实现对导线覆冰过程的模拟。通过对不同覆冰影响因素的计算,总结了覆冰强度、局部碰撞率与气温、风速、水滴直径之间的相互关系。最后进行了导线覆冰模拟试验,试验结果与数值计算结果吻合较好,表明模型正确有效,可用于导线覆冰的预测。

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