摘要
针对某蓄能电站500 k V出线场防雷接地系统存在的具体问题,进行分析。通过现场测量土壤电阻率随极间距离变化的曲线,得到土壤的分层结构。并基于MATLAB软件平台,利用非线性优化方法,推导出视在土壤电阻率的解析表达式,建立精确的非均匀土壤结构模型。现场测试结果表明,该模型能精确的计算多层土壤电阻率的接地电阻,具有一定的工程应用价值。经最终检测,本次的改造优化设计,有效的降低了出线场的接地电阻。
In this paper, some problems of the lightning protection system are analyzed for a 500 kV outgoing line yard of one pumped storage power station. Through the field measurement of the curve of soil resistivity with the variation of space between elec- trodes, the structure of layered soil is found out. A precise heterogeneous earth structural model is built up by the analytic expression of soil resistivity using nonlinear optimization method based on MATLAB software platform. Field test results show that this model can accurately calculate the grounding resistance of multi-layer soil and has practical application value. And the final detec- tion also indicates the grounding resistance of outgoing line yard is reduced effectively by this ground grid retrofit.
出处
《云南电力技术》
2015年第4期89-93,共5页
Yunnan Electric Power
关键词
精确
土壤结构模型
外延接地网
优化
earth structural model
external grounding grid
optimal
