Simulation and Ultraviolet Spectral Characteristics of Glow-Like Discharge Along the Surface of Porcelain Insulators Considering the Influences of the Humidity and Atmospheric Pressure
Li Yonglin1,2, Huang Shilong1,2, Liu Yunpeng1,2, Geng Jianghai1,2, Niu Leilei1,2
1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China; 2. Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense North China Electric Power University Baoding 071003 China
Abstract：Changes in environmental factors may exert significant influences on the ultraviolet (UV) imaging detection results of discharge on polluted porcelain insulators and then affect the accuracy of subsequent UV detection results. This makes it necessary to analyze influences of environmental factors on UV discharge detection of polluted porcelain insulators. Studying the surface air discharge process using a numerical simulation model can describe the macroscopic discharge process; It also can explain problems including the formation, diffusion, migration, and disappearance of key particles in the discharge process from a more microscopic perspective. However, existing research using a simulation model for surface discharge seldom focuses on particles that induce light radiation in the solar-blind UV region in the discharge process and chemical reaction of these particles. In view of this, influences of the humidity and atmospheric pressure on the formation process of light radiation in the solar-blind UV region during glow-like discharge along the surface of porcelain insulators were evaluated from macroscopic and microscopic perspectives by combining the tests and a simulation model. A discharge test platform for polluted porcelain insulators was established, then, a spectrograph was used to acquire emission spectra of glow-like discharge in the solar-blind UV region (240 to 280 nm) under different humidifies and atmospheric pressures. Thereafter, a two-dimensional (2D) simulation model for glow-like discharge along the surface of porcelain insulators in the humid air was established using finite element software according to the test parameters and spectral analysis results. Changes in the number density and rate of formation of microscopic particles in the discharge area were obtained through simulation. Finally, the test analysis and simulation results were integrated to reveal the mechanisms causing changes in light radiation intensity in the solar-blind UV region under different humidifies and atmospheric pressures. Analysis of emission spectra of glow-like discharge along the surface of porcelain insulators in the tests indicates that the formation of light radiation in the solar-blind UV region is related to the de-excitation reactions of excited particles N2(A) and NO(A). Meanwhile, excited particles N2(B) and N2(C) are quickly de-excited into N2(A) in the discharge process, which indirectly influences light radiation intensity in the solar-blind UV region by altering the number of particles N2(A). The analysis results are an important basis for establishing the 2D simulation model for glow-like discharge along the surface of porcelain insulators. Through simulation, the radial distribution of the electric field intensity, electric current density, and electron density on the plate surfaces could be determined. This verified that the established discharge simulation model is at the glow-like discharge stage in numerical simulation, which conforms to the discharge stage in the tests. Hence, the simulation model can be used to characterize the glow-like discharge process along the surface of porcelain insulators in the tests. The acquired discharge spectra and simulation results were combined and analyzed. The results show that when the humidity increases, the number density and rate of formation of particles N2(A) and NO(A) in the discharge area tend to grow, enhancing the light radiation intensity in the solar-blind UV region induced by discharge. When the atmospheric pressure decreases, the number density and formation rate of particles N2(A) and NO(A) increase in the discharge area. As a result, the light radiation intensity in the solar-blind UV region induced by discharge increases. In the meantime, changes in the humidity and atmospheric pressure only affect the number, distribution, and rate of reaction of relevant particles in the discharge area while do not influence whether the chemical reactions happen or not. When combining the present research with previous research results arising from the use of transmission models of light radiation in the solar-blind UV region, the UV discharge detection results can be converted from UV spot areas to an objective physical quantity, namely, spectral irradiance. This can avoid influences of the difference in UV imager models on the detection results and further achieve quantitative analysis of the UV detection results in the future.
李泳霖, 黄世龙, 刘云鹏, 耿江海, 牛雷雷. 考虑湿度气压影响的瓷绝缘子沿面类辉光放电仿真及其紫外光谱特性分析[J]. 电工技术学报, 2023, 38(7): 1956-1969.
Li Yonglin, Huang Shilong, Liu Yunpeng, Geng Jianghai, Niu Leilei. Simulation and Ultraviolet Spectral Characteristics of Glow-Like Discharge Along the Surface of Porcelain Insulators Considering the Influences of the Humidity and Atmospheric Pressure. Transactions of China Electrotechnical Society, 2023, 38(7): 1956-1969.
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2023, Vol. 38 
