针对某蓄能电站500 kV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 expres-sion 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.
展开▼
