电工技术学报  2021, Vol. 36 Issue (13): 2667-2674    DOI: 10.19595/j.cnki.1000-6753.tces.200779
放电等离子体及其应用专题 |
空气间隙击穿后放电通道内的气体运动特性
刘晓鹏1, 董曼玲2, 邓虎威1,3, 赵贤根1, 何俊佳1
1.华中科技大学电气与电子工程学院强电磁工程与新技术国家重点实验室 武汉 430074;
2.国网河南省电力公司电力科学研究院 郑州 450052;
3.广东电网有限责任公司茂名供电局 茂名 525000
Movement Characteristics of the Gas in Discharge Channel after Air Gap Breakdown
Liu Xiaopeng1, Dong Manling2, Deng Huwei1,3, Zhao Xiangen1, He Junjia1
1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China;
2. State Grid Henan Electric Power Corporation Research Institute Zhengzhou 450052 China;
3. Maoming Power Supply Bureau Guangdong Power Grid Co. Ltd Maoming 525000 China
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摘要 空气间隙击穿后放电通道内气体的运动关系着间隙绝缘强度的恢复,而绝缘强度的恢复程度对输电线路因间隙放电而跳闸后的重合闸成功与否具有决定性的影响。该文采用高速纹影技术,获得棒-板空气间隙击穿后放电通道演化过程的纹影图像,并基于光流法获得了间隙击穿后放电通道内气体速度场的时空分布。观测结果表明:间隙击穿后放电通道内气体运动的平均速度以“双指数”方式衰减;放电通道在边缘处的射流发展成为湍流的概率较小,同时,射流的发展使放电通道先呈现“由弯变直”的趋势,而后逐渐变得不规则;间隙击穿后的初期,靠近棒电极的放电通道内气体的运动方向呈现相反的趋势,这有助于棒电极附近的放电通道先恢复到放电前的状态。
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董曼玲
刘晓鹏
董曼玲
邓虎威
赵贤根
邓虎威
何俊佳
赵贤根
何俊佳
关键词 空气间隙击穿空气间隙击穿放电通道放电通道纹影技术纹影技术光流法速度场光流法速度场    
Abstract:The movement of the gas in the discharge channel after the air gap breakdown is related to the recovery of the gap insulation strength, and the degree of recovery of the insulation strength has a decisive influence on the success of the reclosure after the transmission line is tripped due to the gap discharge. In this paper, high-speed schlieren technology was used to obtain the schlieren images of the discharge channel evolution process after the rod-to-plate air gap breakdown and the space-time distribution of the gas velocity field in the discharge channel after the gap breakdown was obtained based on the optical flow method. The results show that the average velocity of the gas movement in the discharge channel after the gap breakdown decays in a “double exponential” manner; the probability that the jet at the edge of the discharge channel develops into turbulence is small, and at the same time, the development of the jet makes the discharge channel first show the trend of ‘changing from bending to straightening' and then gradually becoming irregular; the gas movement direction in the discharge channel close to the rod electrode shows an opposite trend, which helps the discharge channel in the rod electrode area to recover firstly to the state before discharge.
Key wordsAir gap breakdown    Air gap breakdown    discharge channel    schlieren technology    discharge channel    optical flow method    schlieren technology    velocity field    optical flow method    velocity field   
收稿日期: 2020-07-03     
PACS: TM855  
通讯作者: 刘晓鹏 男,1995年生,硕士研究生,研究方向为长空气间隙放电及绝缘恢复机理。E-mail:lxpeng@hust.edu.cn   
作者简介: 董曼玲 女,1983年生,博士,研究方向为暂态过电计算与绝缘配合。E-mail:31906845@qq.com
引用本文:   
刘晓鹏, 董曼玲, 邓虎威, 赵贤根, 何俊佳. 空气间隙击穿后放电通道内的气体运动特性[J]. 电工技术学报, 2021, 36(13): 2667-2674. Liu Xiaopeng, Dong Manling, Deng Huwei, Zhao Xiangen, He Junjia. Movement Characteristics of the Gas in Discharge Channel after Air Gap Breakdown. Transactions of China Electrotechnical Society, 2021, 36(13): 2667-2674.
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