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接地系统地面高阻层的特性

DOI: 10.13336/j.1003-6520.hve.2015.05.022, PP. 1582-1588

Keywords: 变电站,接地系统,地表高阻层,跨步电位差,接触电位差,接地电阻

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Abstract:

为了获得地表高阻层的电阻率、厚度等对接地网各项参数的影响,以某50m×50m接地网为例,基于电磁场数值计算手段,搭建高阻层计算模型,开展仿真研究工作,进一步总结高阻层使用时需要注意的问题,提出高阻层的使用方法,以便指导工程实际。研究表明由于高阻层的电阻率和厚度对接地电阻、地表电位分布、接触电势差、跨步电势差等影响很小,但高阻层可以明显提高人体的耐受限值,因此高阻层是提高接地网安全性能的非常有效的措施。由于人体的耐受限值随高阻层厚度的增加存在饱和趋势,建议高阻层厚度在0.1~0.2m即可。为了保证高阻层的使用效果,在实际工程中,最好将接地网埋设在原土壤下0.8m处,再在土壤表面增设高阻层。

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