冲击电流下土壤复视在参数特性研究

Characterization of Complex Soil Parameters Under Impulse Current

在500 kV及以上的高电压等级输电线路雷电防护设计与检修中,准确获取附近环境的土壤视在参数特性是保障其安全可靠运行的基础。为有效获取冲击电流下土壤复视在参数特性,通过联合离散复镜像法与差分进化方法来研究。首先利用离散复镜像法计算了土壤的理论复视在参数,然后通过不同频率下的核函数计算对比验证了计算精度,最后通过差分进化方法对非均质土壤复视在参数进行反演,并计算了不同电极跨度下的土壤复视在电阻率实部与虚部参数值。

Accurate acquisition of soil apparent parameter characteristics of nearby environment in design and maintenance of lightning protection is the basis for ensuring safe and reliable operation of 500 kV and higher voltage transmission lines.By combining methods of discrete complex mirror with differential evolution,this paper studied how to effectively obtain characteristics of soil complex apparent parameters under impulse current.First the theoretical complex apparent parameters of soil were calculated by means of discrete complex mirror.Then the calculation accuracy was verified by comparing the kernel function calculation at different frequencies.Finally the inversion of complex apparent parameters of non-homogeneous soil was performed using differential evolution method,and values of real and imaginary resistivity of soil complex apparent parameters were calculated at different electrode spans.