直流接地极线路招弧角间电弧的运动模型  

Motion Model of Arc between Arcing Horns in DC Grounding Electrode Line

作　　者：王涛 郑连清[1] 范松海 官瑞杨 孙鹏宇 Wang Tao;Zheng Lianqing;Fan Songhai;Guan Ruiyang;Sun Pengyu(State Key Laboratory of Power Transmission Equipment&System Security and New Technology,Chongqing University,Chongqing 400044,China;State Grid Sichuan Electric Power Research Institute,Chengdu 610041,Sichuan,China;State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment,Department of Electrical Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆400044 [2]国网四川省电力公司电力科学研究院,四川成都610041 [3]电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系),北京100084

出　　处：《四川电力技术》2019年第4期11-16,共6页Sichuan Electric Power Technology

摘　　要：针对直流接地极线路在遭受雷击和操作过电压时容易在绝缘子串间建立起电弧的问题,采用链式电弧模型,考虑电流元受磁场力、热浮力和空气阻力的作用以及电流元在不同运动速度下空气阻力系数与雷诺数之间的关系,分析电流元的受力,得出电弧的运动模型。通过仿真分析直流电弧在羊角型电极间的运动过程,发现直流电弧的熄弧时间与电流大小、电极张角之间存在相关关系,电弧电流和电极张角越大,直流电弧的熄弧时间越短。仿真研究结果为后续进行直流电弧试验提供理论依据。Aiming at the problem that DC grounding electrode line is easy to build arc between insulator strings when subjected to lightning stroke and operating overvoltage,the chain arc model is adopted to consider the effect of magnetic field force,ther-mal buoyancy and air resistance on current element,and the relationship between air resistance coefficient and Reynolds num-ber under different moving speeds of current element.The force of current element is analyzed and the motion model of arc is obtained.Through simulation and analysis of the movement of DC arc between sheep-horn electrodes,it is found that there is a correlation between the extinguishing time of DC arc and the magnitude of current and electrode opening angles.The bigger the arc current and the electrode opening angle,the shorter the extinguishing time of DC arc.The simulation research provides a theoretical basis for the subsequent DC arc test.

关 键 词：直流电弧 招弧角 电弧电流 电极张角 运动模型 

分 类 号：TM86[电气工程—高电压与绝缘技术]