Simulation Analysis of Tree Contact Incipient Fault in the Distribution Network Based on Magnetohydrodynamic
Cong Zihan1, Liu Yadong1, Yan Yingjie1, Fang Jian2, Jiang Xiuchen1
1. School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai 200240 China; 2. Guangzhou Power Supply Bureau Co. Ltd Guangzhou 510620 China
Abstract In order to study the development characteristics of the tree contact incipient fault in the distribution network, based on the theory of magnetohydrodynamics, an arc simulation model is established, and the influence of separation speed and wind speed on the development process of arc is studied. The results show that the increase of the separation speed reduces the maximum temperature of the arc from 14 315.1K to 13 591.6K at the same moment. In addition, the peak value of the arcing peak and the extinguishing peak of the voltage waveform increase, the moment when the arcing peak appears is delayed and the extinguishing peak appears earlier. Wind will lengthen the arc and drive the arc root to move on the surface of the wire and branches. The moving distance of the arc root on the surface of the branches keeps increasing, while the moving distance on the surface of the wire shows a trend of first increasing and then decreasing. As the wind speed increases, the temperature of the arc drops rapidly, and its duration is shortened, and it cannot even last for a power frequency cycle at a wind speed of 20m/s.
Cong Zihan,Liu Yadong,Yan Yingjie等. Simulation Analysis of Tree Contact Incipient Fault in the Distribution Network Based on Magnetohydrodynamic[J]. Transactions of China Electrotechnical Society, 2020, 35(zk2): 562-568.
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2020, Vol. 35 
