Frequency and Impedance Response Calculation Method for Equivalent Circuit of Transmission Tower Grounding Electrode

本研究针对输电杆塔接地体等值电路在宽频域下的频率与阻抗响应计算问题，提出基于二端口网络理论的建模与分析方法。通过将接地体分布参数模型分解为多段二端口网络单元，利用级联传输矩阵法构建系统整体传输矩阵，建立接地体的等值电路的频率响应与阻抗响应特性曲线计算公式，并采用Multisim电路仿真平台对所述方法的计算结果进行验证。研究表明，理论计算与仿真结果的频率响应曲线相关系数达0.999以上，能够准确计算接地体等值电路的频率响应与阻抗特性。本文研究可为防雷接地系统的频率特性与阻抗响应计算提供理论依据。The issue of calculating the frequency and impedance responses of the equivalent circuit of transmission tower grounding bodies over a wide frequency range is addressed in this study. A modeling and analysis method based on the two-port network theory is proposed. By decomposing the distributed parameter model of the grounding body into multiple two-port network units, the overall transmission T-matrix of the system is constructed using the cascaded transmission matrix method. This establishes the calculation formulas for the frequency response and impedance response characteristics of the equivalent circuit of the grounding body. The Multisim circuit simulation platform is employed to validate the computational results of the proposed method. The research demonstrates that the correlation coefficient between the theoretical calculations and the simulation results of the frequency response curve exceeds 0.999, indicating accurate calculation of the frequency response and impedance characteristics of the equivalent circuit of the grounding body. A theoretical basis for the calculation of frequency characteristics and impedance responses in lightning protection grounding systems is provided through this investigation.