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电网技术  2015 

基于地中电场分布的针刺式接地装置结构参数优化

DOI: 10.13335/j.1000-3673.pst.2015.10.034, PP. 2907-2914

Keywords: 电场分布,火花区域,短导体,长度,间距

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Abstract:

已有的研究结论表明,在接地极上添加“针刺状”短导体可有效改善接地装置的冲击接地性能。建立了接地极冲击特性有限元模型,分析了端部效应、电流屏蔽效应对地中电场分布的影响规律,系统地研究了所添加的短导体长度及相邻短导体之间的间距对接地极周围土壤火花放电区域与冲击电阻的影响,并对仿真结论进行了试验验证。研究结果表明,短导体长度主要受接地极本体的火花放电及接地极与短导体之间的电流屏蔽效应的影响,所添加短导体的长度宜为0.5’1.0m;相邻短导体之间的合理间距主要受接地极与短导体之间、相邻短导体之间的电流屏蔽效应的影响,短导体长度为0.5m时,其相邻间距宜为0.5~0.8m;短导体长度为1.0m时,其相邻间距宜为1.0’1.6m;综合考虑,短导体布置间距可取为短导体长度的1’1.5倍。

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