双端电磁气吹分段灭弧装置快速熄弧研究  

Rapid arc extinguishing of a double-ended electromagnetic air-blast segmented arc-extinguishing device

作　　者：李雄 杨廷方[1] 周慧康 杨文超 冯明浩 卓超[1] LI Xiong;YANG Tingfang;ZHOU Huikang;YANG Wenchao;FENG Minghao;ZHUO Chao(School of Electrical&Information Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学电气与信息工程学院,湖南长沙410114

出　　处：《电力工程技术》2025年第2期229-238,共10页Electric Power Engineering Technology

基　　金：湖南省自然科学基金资助项目“城市轨道交通引起变压器直流偏磁机理及抑制方法研究”(2022JJ30043)。

摘　　要：针对现有的并联保护间隙不能主动熄灭电弧,导致输电线路供电可靠性下降的问题,提出一种利用工频续流流过线圈产生磁场,通过电磁力带动活塞压缩空气,喷射出高速气流灭弧的方法,设计双端电磁气吹分段灭弧装置。根据磁流体动力学理论建立有限元仿真模型,并对该装置灭弧过程进行仿真分析。结果表明:该装置产生的灭弧气流最大速度可达330 m/s,从上下两端快速作用于电弧,在高速气流作用下,电弧逐渐变细进而打破动态平衡,电弧弧柱温度在3 ms内下降到2000 K,将电弧通道掐断,从而实现“建弧无通道”的灭弧效果,使电弧在3 ms内快速熄灭,灭弧时间仅为未安装该装置前的9%。因此,该装置可大大缩短灭弧时间,提高电力系统的供电可靠性。To address the issue of decreased reliability in power transmission caused by the incapability of existing parallel protection gaps to actively extinguish arcs,a method utilizing the power-flow current flowing through coil to generate a magnetic field,and employing electromagnetic force to drive a piston to compress air and jet high-speed airflow for arc extinction is proposed.Consequently,a double-ended electromagnetic air-blast segmented arc-extinguishing device is designed.Based on the theory of magnetohydrodynamic,the theoretical model is built by using finite element simulation software,and the arc-extinction process of the device is simulated and analyzed.The results show that the arc-extinguishing airflow maximum speed is up to 330 m/s.Arc-extinguishing airflow rapidly act on the arc from the upper and lower ends,under the action of high-speed airflow,the arc gradually thinned out to break the dynamic equilibrium.The arc column temperature decreases to 2000 K within 3 ms,and the arc channel pinch off,so as to realize the″no arc channel″.The arc-extinguishing time is only 9%of the time before the installation of the device.The device can greatly shorten the arc-extinguishing time,and improve the reliability of the power supply system.

关 键 词：雷电 并联保护间隙 多物理仿真平台 磁流体动力学理论 工频续流 电磁气吹 

分 类 号：TM854[电气工程—高电压与绝缘技术]