基于多重雷击防护的爆轰气流灭弧机理研究  

Research on explosion airflow arc-extinguish mechanism based on multiple lightning strike protection

作　　者：王国锋 Wang Guofeng(School of Electrical Engineering,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学电气工程学院,南宁530004

出　　处：《电测与仪表》2021年第1期84-90,共7页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(51467002)。

摘　　要：当多重雷击连续向输电线路放电时,将会对电网安全稳定运行造成严重打击,雷击跳闸事故会造成重大的安全隐患与经济损失。由于目前对多重雷击的防护存在空白,故提出了一种通过雷电诱导爆轰气流的灭弧防雷装置,实现对多重雷击重复建弧防护的全覆盖。先对灭弧原理进行了简单分析论证;建立了数学模型,对爆轰气流在灭弧筒内的作用效果进行分析计算;提出了多重雷击模型,并用fluent仿真软件对气流与电弧的耦合过程进行模拟;最后通过实验验证装置对多重雷击防护的可靠性。结果表明:爆轰气流能在0.5L的刚性空间内维持5.65 MPa的强气压2.64 ms;电弧能在气流正压作用时间内可靠熄灭,且未发生重燃,有效抑制了多重雷击下的重复建弧。When the multiple lightning strikes continuously discharge to the transmission line,it will cause serious damage to the safe and stable operation of the power grid.The lightning trip accident will cause serious safety hazards and economic losses.Since there is a blank for the protection of multiple lightning strikes,an arc-extinguishing lightning protection gap device for inducing solid-phase airflow by lightning is proposed to achieve full coverage of repeated lightning strikes protection.Firstly,the arc-extinguishing principle is briefly analyzed through the general objective law.Then,a mathematical model is established,the effectiveness of the explosion airflow in the arc extinguishing cylinder is expounded by analysis and calculation.A multiple lightning strike model is proposed,and the simulation software named FLUENT is adopted to simulate the coupling process of the airflow and arc.Finally,the reliability of the device for multiple lightning strike protection is verified by experiments.The experimental results show that the explosion airflow can be maintained for more than 2.64 ms in the rigid space of 0.5L.Arc can be reliably extinguished during the positive pressure of the airflow and no reignition occurs,which explains that the device effectively suppresses the repeated arcing under multiple lightning strikes.

关 键 词：多重雷击 爆轰气流 电弧 重复建弧 灭弧筒 

分 类 号：TM8[电气工程—高电压与绝缘技术]