An ATP-EMTP simulation model is proposed for calculating lightning transient effects on transmission lines. Both frequency dependent of transmission line and impulse corona effect are considered in this model. The frequency dependent characteristic is analyzed by Marti line model and a user defined corona mod- el is applied to simulate the effect of impulse corona. The expression of geometric capacitance is derived by means of image theory and the dynamic capacitance for line with corona is computed on this base. The simula- tion results show that the effect of corona plays a more important role than that of frequency dependent charac- teristic on lightning overvohage, while it accords more with the facts to take both the effect of frequency dependent characteristic and that of impulse corona. The model presented in this paper can calculate the possible overvohages on transmission line to provide reliable guidelines for insulating and lightning protection design of transmission line.%为了研究架空输电线路在雷击情况下的暂态特性,提出了一种ATP-EMTP的仿真模型.该模型同时考虑了输电线路参数的频变特性和冲击电晕效应,利用Marti线路模型分析输电线路的频变特性,通过自定义的电晕模块模拟冲击电晕效应.运用镜像法推导了线路几何电容的表达式,并在此基础上计算了发生电晕时线路的动态电容.仿真结果表明,冲击电晕效应对雷电过电压波的衰减和变形作用较参数频变特性严重,而同时考虑输电线路参数的频变特性和冲击电晕效应更符合实际情况.所提出的模型可精确地计算输电线路上可能出现的过电压水平,为线路的绝缘设计和防雷保护等提供可靠的依据.
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