覆冰状态下架空输电线路模型参数变化分析

架空输电线路的覆冰灾害一直都是困扰输电线路的重要问题，线路覆冰后，其等效的模型参数将发生变化。根据导线覆冰的种类和导线外层覆冰的时空特点，通过电磁场的相关计算，对覆冰架空输电线路的单位阻抗和导纳参数进行了修正。根据架空线路模型的建立方法，分析了考虑分布参数时不同电压等级和长度的架空输电线路的等效模型，在理论上得出了覆冰后架空输电线路更加精确的模型参数。

Model Parameter Variation of Iced Overhead Transmission Line

The icing disasters on overhead transmission line have always been a puzzle to the transmission line. The equivalent model parameters of iced transmission line will change. According to the type of wire and the spatial and temporal characteristics of the outer layer of icing, this paper made modification to unit impedance and admittance parameters of iced overhead transmission lines through the calculation of electromagnetic fields. According to the establishment of overhead line model, this paper analyzed the equivalent model of overhead transmission lines in different voltage levels and length with considering the distribution parameters. In theory, more accurate model parameters of iced overhead transmission lines were obtained.