冲击电晕对输电线路中雷电波传播的影响研究  

Study on the Influence of Impulse Corona on the Propagation of Lightning Wave

作　　者：陈则煌[1,2] 王荣珠[1,2] 周中山[1,2] 张云峰[1,2] 

机构地区：[1]南京信息工程大学气象灾害预报预警与评估协同创新中心,南京210044 [2]南京信息工程大学大气物理学院,南京210044

出　　处：《电瓷避雷器》2015年第2期94-98,104,共6页Insulators and Surge Arresters

基　　金：雷电发展传输的物理过程及成灾机理研究(编号:2014CB441405)

摘　　要：针对直击雷击中架空线容易产生冲击电晕的问题,本文以冲击电晕的数学模型为基础,利用暂态分析软件ATP-EMTP建立了输电线路模型和冲击电晕动态模型。通过仿真计算发现,由于电晕的存在,雷电波波头时间被拉长而且幅值减小,即波形发生了衰减和畸变。雷击点距测量点的距离越远,波头时间越长,畸变现象越严重。计及电晕影响比不计电晕影响时,幅值分别小了26%、33%和39%;受电晕影响,波头时间则分别增长了74%、143%、271%。波尾部分仅仅是前面波形波尾的平移,并没有发生畸变和时间变长的现象。这是由于电晕的形成可以等效为传输线半径的增大,从而输电线对地的电容变大,最终导致考察的节点处电压值u按不同的波速向前传播了。模型的仿真结果与实验结果相似,对于指导输电线路终端设备安装电涌保护器具有十分重要的现实意义。According to the problem that impulse corona is easy to happened on HV transmission line, based on the mathematic model, the transmission line model and impulse corona dynamic model are established by the transient analysis software ATP-EMTP. According to the simulation, due to the existence of the corona, the front of lightning wave become longer and the crest is decreased, i.e. the wave is attenuated and distorted. And this phenomenon is graver when the measured point is far from the stroke point. Compared with situation when the corona is or is not under consideration, the peak values of the voltage were reduced by 26%, 33% and 39% respectively and the front time increased by 74%, 143% and 271%. The wave tail part is just translation of the front wave tail without the distortion and time variable-length phenomenon. This is due to the formation of the corona can be equivalent to the increase of the radius of a transmission line, thus the Capacitance to the ground of the transmission line is increase, eventually lead to the value of the node voltage u propagation forward with different wave speed. The model simulation results are similar with the experimental results, which has very important practical significance to the guidance for surge protector devices installation on Transmission line terminal equipment.

关 键 词：雷电波 高压输电线路 冲击电晕 ATP—EMTP 

分 类 号：TM863[电气工程—高电压与绝缘技术]