湿度对雷云电场作用下特高压地线表面电晕放电过程的影响  

Humidity Influence on Discharging Process of Ground Wire Corona Under Thundercloud Background Electric Field

作　　者：林奕彤 安韵竹[1] 姜志鹏 胡元潮[1] 李海涛[1] 陈小月 LIN Yitong;AN Yunzhu;JIANG Zhipeng;HU Yuanchao;LI Haitao;CHEN Xiaoyue(School of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255000,Shandong Province,China;E Zhou Power Supply Company,State Grid Hubei Electric Power Co.,Ltd.,E Zhou 436000,Hubei Province,China;College of Electrical and Automation,Wuhan University,Wuhan 430072,Hubei Province,China)

机构地区：[1]山东理工大学电气与电子工程学院,山东省淄博市255000 [2]国网湖北省电力有限公司鄂州供电公司,湖北省鄂州市436000 [3]武汉大学电气与自动化学院,湖北省武汉市430072

出　　处：《电网技术》2022年第6期2429-2437,共9页Power System Technology

基　　金：国家自然科学基金项目(51807113,51907145);山东省自然科学基金项目(ZR202103040796)。

摘　　要：雷云电场下空气湿度对地线表面电晕放电过程的作用,会影响特高压交流输电线路的雷电屏蔽性能。为此,建立雷云电场下特高压输电线路双地线表面电晕放电模型并试验验证,模拟不同绝对湿度条件下地线表面正离子、气溶胶离子和中性粒子的漂移扩散过程,探究湿度对地线表面电晕放电过程的影响机制,分析湿度对地线接闪性能的影响规律。仿真结果表明:随着雷云电场的增大,空间正离子浓度不断增大并呈对称椭圆分布,地线表面电流增大,最大值为7.47μA·m^(-1);随着空气湿度增大,空间正离子浓度减小,浓度最大值仅相差4%,地线表面电晕电流减小,地线表面电晕放电起始时间延迟,且在雷云电场下参与定向排列水分子数量增多,地线周围电场强度增强,有利于地线表面上行先导起始,提高地线接闪性能。The effect of air humidity on the corona discharging process of the ground wires under the lightning cloud electric field affects the lightning shielding performance of the UHV AC transmission lines.To this end,this paper establishes and verifies the corona discharge model of the UHV transmission line double ground wire surface under the thundercloud electric field and experimentally verifies it.The drift and diffusion process of the positive ions,the aerosol ions and the neutral particles on the ground wire surface under different absolute humidity conditions are simulated.The influence mechanism of the humidity on the corona discharging process of the ground wire surface is explored.The influence law of the humidity on the ground wire lightning performance is analyzed.The simulation results show that with the increase of thundercloud electric field,the spatial positive ion concentration increases and presents symmetrical ellipse distribution,and the surface current of the ground wire increases with the maximum value of 7.47μA·m^(-1).On the other hand,with the increase of air humidity,the concentration of space positive ions decreases with the maximum concentration difference only 4%,and the corona current on the ground wire surface decreases with the starting time of the corona discharging on the ground wire surface delayed.The number of water molecules participating in the directional arrangement increases under the thunderstorm electric field,and the electric field strength around the ground wire also increases,which is beneficial to the upward leader initiation of the ground wire surface and improves the lightning performance of the ground wires.

关 键 词：雷云电场 电晕放电 正离子浓度 湿度 电晕电流 

分 类 号：TM721[电气工程—电力系统及自动化]