班革革;袁涛;司马文霞;杨鸣;姚欣愚;李小川;

• 1:输配电装备及系统安全与新技术国家重点实验室(重庆大学)
• 2:重庆电力公司

摘要(Abstract)：

已有研究表明雷电冲击电流作用下,接地装置冲击散流性能受接地极近区土壤的影响显著,主要表现为土壤出现显著的火花放电现象,而目前对不同类型土壤的冲击散流性能评估还缺乏有效的方法。实际工程中主要是采用经验公式将土壤火花放电效应折算到接地装置的冲击系数中,但该系数是冲击电流作用下接地导体自身电感效应和近区土壤火花放电效应的综合反映结果,并不能准确反映土壤的冲击散流性能。因此,针对该问题采用X射线透视成像技术,开展了接地导体近区土壤冲击散流性能评估方法研究,提出了结合土壤试品冲击放电区域与冲击电流幅值的量化评估指标,即单位电流下土壤放电体积等效值V_I,并对该方法的合理性与有效性进行了验证,分析了不同性质土壤试品中接地装置散流能力的变化规律。结果表明,结合土壤冲击放电影像观测的V_I能够直观地分析土壤试品参数变化对接地装置冲击散流能力的影响规律,并为增强近区土壤冲击散流能力,降低接地装置冲击接地阻抗提供了新的思路。

关键词(KeyWords)： 高土壤电阻率;土壤放电;X射线成像;高分子吸水树脂;土壤散流能力

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51777020);; 国家电网公司科技项目(SGSDDZ00FCJS1700216)~~

作者(Author): 班革革;袁涛;司马文霞;杨鸣;姚欣愚;李小川;

Email:

DOI: 10.13335/j.1000-3673.pst.2019.1375

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