考虑土壤的非线性特性对接地系统冲击特性的影响，基于场路结合思想提出一种新的接地网冲击特性频域分析方法，并进行了接地网的冲击特性模拟试验。推导了考虑土壤非线性特性时接地极的等值半径后经过合理假设建立了更符合实际散流情况的接地系统分析计算模型。该模型待求变量少，计算时间短，兼顾了计算效率和计算精度，适用于分析接地网的冲击暂态特性。计算结果与软件包CDEGS的计算结果及冲击试验结果吻合得较好，进一步验证了该方法的准确性。

Considering the non-linear characteristics of soil, an effective method based on the idea of field-circuit combination was proposed in this paper for analyzing the impulse characteristics of the grounding grid in frequency domain, in which the equivalent radius was deduced. In this method there were fewer unknown variables, less calculation time required and with more reasonable models than other methods, with the consideration of both efficiency and precision involved. Meanwhile, the simulation impulse experiments were carried out on a real small grounding system. The calculation results obtained by this paper were compared with the results using CDEGS and the experimental data, which confirms the validity of the presented method.