李景丽;蒋建东;李丽丽;

• 1:郑州大学电气工程学院
• 2:上海协东电力科技有限公司

摘要(Abstract)：

改善高土壤电阻率地区输电线路杆塔接地装置的冲击散流效率、降低其暂态接地阻抗是提高输电线路耐雷性能的有效措施。采用考虑土壤电离动态过程的接地装置冲击特性有限元模型分别对水平星型接地装置及添加针刺的水平星型接地装置建立有限元分析模型,通过对比加针前后接地装置在冲击电流作用下产生的地表电位分布、地电位升及其周围土壤中的电场分布等参数,分析了针刺式接地装置的降阻机制,认为在土壤结构、电阻率和注入冲击电流一定的条件下,改变接地装置的局部结构,能够使冲击电流入地时土壤中局部电场畸变加强,扩大火花放电区域,从而减小冲击接地电阻。另外基于相似性准则对加针前后的星型水平接地极进行模拟试验测量其冲击接地阻抗,试验结果与数值计算结果的对比分析证实了针刺式接地装置的降阻效果。

关键词(KeyWords)： 针刺式接地装置;降阻;模拟试验;端部效应;火花放电;电场分布

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 李景丽;蒋建东;李丽丽;

Email:

DOI: 10.13335/j.1000-3673.pst.2013.01.037

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