航空电磁超材料沿面及组合间隙操作冲击电压放电特性  

Discharge characteristics of impulse voltage along surface and combined gap of aviation electromagnetic metamaterials

作　　者：蔡力[1] 刘伟[1] 周蜜[1] 李泉新[1] 王建国[1] CAI Li;LIU Wei;ZHOU Mi;LI Quan-xin;WANG Jian-guo(School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学电气与自动化学院,湖北武汉430072

出　　处：《电机与控制学报》2022年第5期46-54,共9页Electric Machines and Control

基　　金：国家自然科学基金(51807144)。

摘　　要：针对目前电磁超材料天线罩的雷电防护研究较少问题,设计定制十字交叉型电磁超材料,针对不同接地方式,并结合高速摄像机,开展电磁超材料不同极性沿面及组合间隙操作冲击放电试验。试验表明十字交叉型电磁超材料冲击击穿电压有明显的极性效应,负极性冲击击穿电压是正极性的1.60~1.85倍,并且正极性击穿发生在波前,而负极性击穿发生在波尾。进一步研究了电磁超材料沿面及组合间隙冲击沿面放电特性,结果表明:就放电路径特征而言,正负极性无明显差别,放电路径单次放电拐点一般不超过两处,放电击穿路径只有一条明亮的主通道;就放电强度而言,负极性放电强度明显大于正极性;在流注发展过程中电磁超材料平板表面形成的自放电通路对最终沿面放电路径起决定性作用。There are few studies on lightning protection for metamaterial radomes.A crossed electromagnetic metamaterial was designed and customized.According to different grounding modes and combined with high-speed video,impulse discharge tests of electromagnetic metamaterials with different polarities along the surface and combined gaps were carried out.The results show that the impulse breakdown voltage of cross electromagnetic metamaterials has obvious polarity effect.The impulse discharge voltage of negative polarity is basically 1.60~1.85 times of positive polarity,and the positive polarity breakdown occurs in the wavefront,while the negative discharge occurs in the wavetail.The discharge characteristics of electromagnetic metamaterials along the surface and the combined gap impact along the surface were further studied.The results show that there is no significant difference between positive and negative polarity in terms of discharge path characteristics,the single discharge inflection point of the discharge path is generally no more than two,and there is only one bright main channel in the discharge breakdown path;In terms of discharge intensity,the discharge intensity of negative polarity is significantly greater than that of positive polarity.The self-discharge pathway formed on the surface of the electromagnetic metamaterial plate during the development of the streamer plays a decisive role in the final discharge path along the surface.

关 键 词：电磁超材料 沿面及组合间隙 操作冲击电压 放电形貌 流注发展 极性效应 

分 类 号：TM83[电气工程—高电压与绝缘技术]