自能式空气炮保护间隙快速熄弧装置  

Rapid Arc-Extinguishing Device for Self-Charging Air Cannon with Protective Clearance

作　　者：罗屹豪 杨廷方[1] 汪新秀 宋华伟 周西杰 刘云辉 LUO Yihao;YANG Tingfang;WANG Xinxiu;SONG Huawei;ZHOU Xijie;LIU Yunhui(School of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410114,China;Electric Power Research Institute of State Grid Hunan Electric Power Company,Changsha 410007,China;Maintenance Company of Hunan Electrical Power Corporation,Changsha 410004,China)

机构地区：[1]长沙理工大学电气与信息工程学院,长沙410114 [2]国网湖南省电力科学研究院,长沙410007 [3]国网湖南检修公司,长沙410004

出　　处：《南方电网技术》2022年第5期71-78,共8页Southern Power System Technology

基　　金：国家自然科学基金资助项目(51777015)。

摘　　要：保护间隙结构简单,但其空气间隙无法快速熄弧,使得线路的跳闸率上升。针对此问题,提出了在保护间隙旁加装一个空气炮的方法,通过喷射出高速气流,带走电弧的热量并拉细电弧,从而加快电弧的熄灭。该空气炮能在灭弧后自动充气,为下一次动作做准备。基于磁流体力学(magnetohydrodynamics,MHD)理论,利用COMSOL软件建立了该新型保护间隙模型以及电弧的仿真模型。经仿真计算,加装自能式空气炮的保护间隙能将电弧拉细到原来粗细程度的25%,更易熄灭。由于气流带走热量,使电弧的弧心温度仅为传统保护间隙的1/3,也使电弧更易熄灭。现场实验证明,加装自能式空气炮的保护间隙的电弧均能够在13.3 ms内被熄灭,远小于传统保护间隙熄弧时间,熄弧时间最多只有传统保护间隙的31.8%。The structure of the protective gap is simple,but the air gap can not quickly extinguish the arc,so the trip rate of the line is high.In order to solve this problem,this paper puts forward a method of installing an air cannon beside the protection gap,which can take away the heat of the arc and make the arc be drawn thin by ejecting high-speed air,so as to speed up the extinction of the arc.And the air gun can automatically inflate after arc-extinguishing for the next action.Based on magnetohydrodynamics(MHD)theory,the new protection gap model and arc simulation model are established by COMSOL software.According to the simulation calculation,the arc can be pulled down to 25%of the original thickness by the protection gap of self-charging air gun,which is easier to extinguish.Because the air flow takes away the heat,the temperature at the arc center is only 1/3 of the traditional protection gap,and the arc is easier to be extinguished.Field experiments show that the arc in the protection gap with self-charging air cannon can be extinguished in 13.3 ms,which is much less than the arc extinguishing time of the traditional protection gap,and the arc extinguishing time is only 31.8%of the traditional protection gap at most.

关 键 词：保护间隙 自能式 磁流体力学 电弧仿真 空气炮 

分 类 号：TM863[电气工程—高电压与绝缘技术]