考虑电晕损耗的特高压直流输电线路雷击特性分析

摘要

某特高压直流线路冲击电晕是雷击导线时产生的一种现场,对特高压直流线路的雷击电晕问题还未见报道.以雷击故障为契机,开展了考虑电晕损耗的特高压直流线路雷击特性分析.基于导线伏库特性计算得到了冲击电晕作用下特高压直流线路的动态电容;同时基于电磁暂态分析软件ATP-EMTP建立了考虑冲击电晕损耗的线路模型,对考虑电晕损耗前后特高压直流线路雷电波传播特性进行了对比,且对特高压直流线路雷击电晕损耗的影响因素进行了分析.所得结论对开展特高压直流线路防雷工作具有重要参考意义.%The impulse corona happens when lightning strikes a conductor, but the corona caused by lightning strikes of UHVDC transmission lines has not been reported.Taking a lightning failure of one UHVDC line as the opportunity, the analysis on lightning performance of UHVDC transmission line considering corona loss is carried out.The dynamic capacity of UHVDC transmission line obtained under impluse corona is caculated based on the V-Q characteristics, and the line model considering impulse corona losses is established by the electromagnetic transient analysis software ATP-EMTP.The lightning wave propagation characteristics of UHVDC transmission line are compared by the line models with and without corona losses.The influencing factors of corona losses caused by lightning strikes in UHVDC transmission line are analyzed.The conclusion is of an important significance for UHVDC line protection against lightning.