氦气下介质阻挡放电表面电荷分布规律  

Distribution Rule of Surface Charge of Dielectric Barrier Discharge in Helium Environment

作　　者：黄寅 孟永鹏[1] 马鑫哲 吴锴[1] 成永红[1] HUANG Yin;MENG Yongpeng;MA Xinzhe;WU Kai;CHENG Yonghong(State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,西安710049

出　　处：《西安交通大学学报》2022年第10期111-121,共11页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51677143,52130703)。

摘　　要：为探究表面电荷在介质阻挡放电(DBD)放电模式转化中的作用机制,对不同电压参数下的表面电荷分布进行了实验研究。首先,根据Pockels效应搭建了微秒级分辨率的表面电荷测量系统,并使用该系统测量常压氦气环境中平板电极在不同电压参数下的介质表面电荷密度二维分布与放电电流波形,统计表面电荷在各密度区间中的概率分布;然后,根据得到的电流波形、表面电荷密度二维分布与概率分布,对不同电压参数下的放电模式进行了判断;最后,分析不同放电模式的电荷密度二维分布与概率分布,得到外加电压参数变化时介质表面电荷对放电模式转化的作用机制:在下次放电前,介质表面积聚的电荷与气隙中残存的带电粒子会产生反向电场,使得放电更容易在该区域发生,从而促使放电模式从均匀放电向丝状放电演化。实验结果表明:随着电压的增加,表面电荷分布从单个电荷斑逐渐向多个电荷斑转变,放电模式表现为不同形式的丝状放电;随着频率的增大,表面电荷分布由均匀分布转变为电荷斑分布,且电荷斑直径不断增大,电荷总量从0.21nC增加到0.41nC。研究结果可为表面电荷对常压介质阻挡放电中放电模式演化的影响机制提供参考。An experiment research is made on the surface charge distribution under different voltage parameters to explore the mechanism of action of the surface charge in the transformation of the discharge mode featuring dielectric barrier discharge(DBD).Firstly,a surface charge measurement system with a microsecond-level resolution is built according to the Pockels effect.The system is used to measure the two-dimensional distribution of the dielectric surface charge density and discharge current waveform of the flat electrode in atmospheric pressure helium environment under different voltage parameters,and the probability distribution of surface charge in each density interval is counted.The discharge modes under different voltage parameters are judged according to the current waveform,two-dimensional distribution and probability distribution of surface charge density.Finally,the two-dimensional distribution of charge density and probability distribution in different discharge modes are analyzed,and the mechanism of action of the dielectric surface charge on the transformation of discharge mode with the change of the applied voltage parameters is obtained.Before the next discharge,the charges accumulated on the dielectric surface and the remaining charged particles in the air gap will generate a reverse electric field,making the discharge easier occur in this area,thus promoting the evolution of the discharge mode from uniform discharge to filamentous discharge.The experimental results show that with the increase of voltage,the surface charge distribution gradually changes from a single charge spot to multiple charge spots,and the discharge mode shows different forms of filament discharge.With the increase of frequency,the surface charge distribution changes from a uniform distribution to a charge spot distribution.The diameter of the charge spot increases continuously,and the total charge increases from 0.21 nC to 0.41 nC.The results can provide a reference for the mechanism of the influence of surface charges on the ev

关 键 词：介质阻挡放电 表面电荷分布 放电特性 常压氦气 POCKELS效应 

分 类 号：TM85[电气工程—高电压与绝缘技术]