空气间隙击穿后电弧通道的特性分析  

Characteristics of the Arc Channel During the Post-discharge Stage in Air Gap

作　　者：刘晓鹏 赵贤根 马御棠 杜亚平[2] 何俊佳[1] LIU Xiaopeng;ZHAO Xiangen;MA Yutang;DU Yaping;HE Junjia(State Key Laboratory of Advanced Electromagnetic Engineering and Technology(School of Electrical and Electronic Engineering,Huazhong University of Science and Technology),Wuhan 430074,Hubei Province,China;Department of Building Environment and Energy Engineering,Hong Kong Polytechnic University,Hong Kong SAR 999077,China;Electric Power Research Institute of Yunnan Power Grid Co.,Ltd.,China Southern Power Grid,Kunming 650217,Yunnan Province,China)

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学电气与电子工程学院),湖北省武汉市430074 [2]香港理工大学建筑环境及能源工程学系,中国香港特别行政区999077 [3]南方电网云南电网有限责任公司电力科学研究院,云南省昆明市650217

出　　处：《中国电机工程学报》2023年第13期5302-5310,共9页Proceedings of the CSEE

摘　　要：空气间隙击穿是输电线路故障的一种常见原因,间隙击穿后电弧通道的发展决定着间隙的绝缘恢复过程。该文搭建包含电学、光学、热学测量的放电试验综合观测平台,对30~50cm空气间隙击穿后电弧通道的演化过程进行研究。光学图像表明,放电通道的发展路径呈现弯弯曲曲的形态,通道的二维长度与间隙距离的比值范围为1.1~1.6,平均值为1.3;基于电压电流波形,计算得到空气间隙击穿后电弧通道的单位长度电阻在Ω/cm量级。根据纹影图像定义了通道的恢复程度,发现通道的恢复时间与放电通道单位长度注入能量正相关。综合该文试验结果,推测空气电弧通道结构为“核–鞘”结构,指出制约弧后恢复的主要是热学恢复过程。相关试验结果可以为间隙击穿后放电通道的恢复过程研究提供一定的借鉴。The breakdown of the air gap is a common cause of transmission line faults.The development of the arc channel after the breakdown determines the insulation recovery process of the gap.A comprehensive test platform including electrical,optical,and thermal measurements is built in this paper to study the evolution process of the arc channel after 30~50cm air gap breakdown.The direct images show that the discharge propagation path presents a curved structure,and the ratio of the two-dimensional length of the channel to the gap distance ranges from 1.1 to 1.6,with an average value of 1.3;the resistance of the arc channel per unit length after air gap breakdown is calculated to be in the magnitude ofW/cm based on the voltage and current waveforms;the recovery degree of the channel is defined according to the schlieren image.It is found that the recovery time of the channel is positively correlated with the energy injected per unit length of the discharge channel.Based on the experimental results in this paper,it is inferred that the structure of the arc channel is like a"core-sheath"structure,and it is pointed out that the thermal recovery process has a decisive influence on the arc recovery process.The relevant test results in this paper can provide some ideas for the research on the recovery process of the discharge channel after the air gap breakdown.

关 键 词：电弧通道 放电路径 通道电阻 恢复时间 纹影技术 空气间隙 

分 类 号：TM75[电气工程—电力系统及自动化]