架空配电线路雷电感应电压特性及解析算法性能分析

Characteristics of lightning induced voltage on overhead distribution lines and performance analysis of analytical algorithm

中文关键词  架空配电线路  雷电感应电压特性  解析计算方法  性能分析

英文关键词  overhead distribution line  characteristics of lightning induced voltage  analytical calculation method  performance analysis

中文摘要

      为了深入理解架空线雷电感应电压特性为配电网雷电防护提供技术参考, 本文采用时域有限差分法及 Agrawal耦合模型对10 kV架空配电线路雷电感应电压进行了数值计算. 以解析计算方法中导线高度、回击电流幅 值以及落雷距离3个特征参数为考察对象, 分析了三者对架空线雷电感应电压的影响, 实现了对解析计算公式计算 精度的定量化分析. 计算表明, 雷电感应电压脉冲幅值随导线高度和回击电流幅值增大均线性提高, 随落雷距离减 小非线性提高. 受水平电场特性及导线相互作用的影响, 落雷距离减小和导线数增多均会显著加重雷电感应电压波 形的畸变. 以数值计算为标准, 解析算法误差可高达45%50%, 本文研究结果可为配电网运维工作提供理论参考.

英文摘要

      In order to deeply understand the lightning induced voltage characteristics of overhead lines and provide technical reference for lightning protection of distribution network, the lightning induced voltages of 10 kV overhead distribution lines were calculated by using the finite difference time domain method and Agrawal coupling model. Taking the three characteristic parameters of conductor height, return-stroke current amplitude and return-stroke distance in the analytical calculation method as the investigation objects, the effects of the three parameters on lightning induced voltage of overhead lines were analyzed. The quantitative analysis of the calculation accuracy of the analytical calculation formula was realized in this paper. The results show that, the lightning induced voltage pulse amplitude increases with the increase of conductor height and return-stroke current amplitude, and increases nonlinearly with the decrease of return-stroke distance. Affected by the characteristics of horizontal electric field and the interactions of conductors, the reduction of return-stroke distance and the increase of the number of conductors will significantly aggravate the distortion of lightning induced voltage waveforms. Taking the numerical calculation as the standard, the error of the analytical algorithm can be as high as 45%50%. The results of this paper can provide theoretical reference for the operation and maintenance of distribution network.