Simulation of GIS Epoxy Insulator Surface Discharge Channel Based on Fractal Theory

2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO) Pub Date : 2021-10-15 DOI:10.1109/AEERO52475.2021.9708378

K. Gao, Tengfei Li, Min Lin, Gangjie Zhou, Yong Ma, Lijun Jin

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Abstract

Metal particles in gas insulated switchgear (GIS) can cause partial discharge or even flashover on the surface of basin insulator. Based on the fractal theory and streamer breakdown theory, a simulation model of discharge channel on the surface of epoxy insulator is established. By assuming that the defect is metal particles, the discharge channels with different defect locations and different defect degrees are simulated. The fractal dimension of discharge channel is calculated by box width counting method, and its characteristics are analyzed. The results show that the extending velocity of the discharge channel increases exponentially with the development of discharge. With the metal particles close to the high voltage electrode, the critical voltage of flashover decreases, and the fractal dimension of discharge channel increases. The research results can provide theoretical support for exploring the flashover characteristics of metal particles on GIS insulators.

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基于分形理论的GIS环氧绝缘子表面放电通道仿真

气体绝缘开关设备中的金属颗粒会引起盆形绝缘子表面局部放电甚至闪络。基于分形理论和流线击穿理论，建立了环氧绝缘子表面放电通道的仿真模型。假设缺陷为金属颗粒，模拟了不同缺陷位置和不同缺陷程度的放电通道。采用箱宽计数法计算了放电通道的分形维数，并对其特征进行了分析。结果表明，随着流量的发展，泄流通道的扩展速度呈指数增长。随着金属颗粒靠近高压电极，闪络临界电压降低，放电通道分形维数增大。研究结果可为研究GIS绝缘子上金属颗粒的闪络特性提供理论支持。

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2021 International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO)

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