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福建宁德大烟35kV线路雷击断线事故分析及防雷措施研究

, PP. 47-51

Keywords: kV线路,雷击断线事故,避雷器,改造措施

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Abstract:

对宁德大港水电站大烟35kV线路近几年发生的多起雷击断线事故进行了分析和讨论,并根据线路的实地调查情况以及实验室试验结果,认为避雷器与绝缘子配合不当、线路与变电站绝缘水平不配合、进线段保护措施不完善、中性点接地方式存在问题是该线路多年来频发雷害事故的主要原因。研究表明:对配合不当的线路避雷器进行试验和更换;完善变电站进线段保护;测量系统电容电流,确定合适的中性点接地方式等改造措施可大大降低雷击事故的概率,提高线路运行的安全可靠性,这些措施已在福建许多地区实行,取得很好的防雷效果。

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