基于气吹原理的一体化防雷间隙快速灭弧方法  

Rapid Arc-Extinguishing Method of Integrated Lightning Protection Gap Based on the Principle of Air-Blowing

作　　者：周慧康 杨廷方[1] 罗屹豪 易维 谢泽龙 王润璞 单淞译 ZHOU Huikang;YANG Tingfang;LUO Yihao;YI Wei;XIE Zelong;WANG Runpu;SHAN Songyi(College of Electrical and Information Engineering,Changsha University of Science&Technology,Changsha 410114,China;State Grid Hunan Electric Power Co.,Ltd.,Changsha 410118,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]国网湖南省电力有限公司,长沙410118

出　　处：《南方电网技术》2023年第12期119-126,151,共9页Southern Power System Technology

基　　金：国家自然科学基金资助项目(51777015)。

摘　　要：并联间隙结构简单,但雷击过后,由工频续流导致的电弧无法快速熄灭,故使得线路的跳闸率上升。提出了一种新型一体化防雷间隙,利用磁能气吹装置喷射高能气流作用于间隙电弧致使其快速熄弧的方法,加快电弧能量消散,同时使间隙电弧能迅速变细,截断工频续流,从而达到快速熄弧的目的。基于磁流体力学(magnetohydrodynamic,MHD)理论,利用有限元仿真分析软件搭建了该理论模型,并进行了交流电弧灭弧实验。研究结果表明:该基于气吹原理的一体化防雷间隙能使电弧的弧柱温度在短时间降低至原来的1/5,电弧吹细至原来的30%,使电弧熄灭时间最长不超过5 ms,只有传统保护间隙熄弧时间的6%~8%。所提方法极大地缩短了间隙工频续流电弧的熄灭时间,保证了电力系统的供电可靠性。The structure of the parallel gap is simple.However,after the lightning strike,the arc caused by the power frequency continuous flow cannot be extinguished quickly,so the tripping rate of the line rises.A new integrated lightning protection gap is proposed,which uses magnetic energy air blowing device to spray high-energy air flow acts on the gap arc,causing it to quickly extinguish the arc,and accelerate the dissipation of arc energy,while quickly thinning the gap arc,cutting off the power frequency cur⁃rent,and achieving the goal of rapid arc extinguishment.Based on the theory of magnetohydrodynamics(MHD),a finite element simulation analysis software is used to construct the theoretical model,and AC arc extinguishing experiments are conducted.The research results show that the integrated lightning protection gap based on the principle of air blowing can reduce the arc column temperature of the arc to 1/5 of the original in a short time,blow the arc to 30%of the original,and make the arc extinguishing time no more than 5 ms,which is only 6%~8%of the traditional protection gap extinguishing time.The proposed method greatly shortens the extinguishing time of gap power frequency continuous current arc,and ensures the power supply reliability of the power system.

关 键 词：保护间隙 一体化防雷间隙 有限元分析 磁流体动力学 灭弧 

分 类 号：TM863[电气工程—高电压与绝缘技术]