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
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.
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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2021, Vol. 36 
