摘要
为克服接地体传输线模型在进行雷电暂态响应计算时存在的分段导体尺寸难以确定,及分段元件间互耦参数计算困难的2个技术瓶颈,采用电磁散射理论与矩阵分析方法对传统时域传输线模型进行了优化。改进后模型考虑了土壤火花放电效应,给出了等效差分元件尺寸选取方法及分段导体间互耦参数递归的计算方法,可有效计算接地体雷电流作用下的冲击有效长度及冲击接地电阻。经与试验结果对比,证明了优化后模型的计算结果误差较小,能够满足工程应用要求。
In order to overcome the problems existed in lightning behavior calculation of transmission line modeling, which are difficulties in determination of the different segment sizes of grounding conductors and in calculation of the mutual coupling parameters between the segments, an improved time-domain transmission line model was presented based on the electromagnetic scattering theory and the matrix analytical method with the soil ionization effects taken into consideration; and a method was proposed to calculate the size and mutual coupling parameters of grounding conductor segments. The improved model is capable of predicting the effective length and impulse resistance of ground electrode under lightning strike. The experiment conducted with EDF （Electricite de France） verified that it can be applied in engineering calculation.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2011年第13期142-146,共5页
Proceedings of the CSEE
关键词
接地体
传输线模型
冲击特性
火花放电
grounding electrode
transmission line model
impulse characteristic
soil ionization
