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The current pulses characteristics of the negative corona discharge in SF_(6)/CF_(4)mixtures

Plasma Science and Technology 2023年第2期25卷 119-130页

作者：高青青王小华 Kazimierz ADAMIAK 杨爱军刘定新纽春萍张嘉伟 School of Electrical Engineering Xi'an University of TechnologyXi'an 710048People's Republic of China State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'an 710049People's Republic of China Department of Electrical and Computer Engineering Western UniversityOntario N6A5B9Canada

This paper presents the results of numerical investigation of the current pulses characteristics in SF_(6)/CF_(4)mixtures for the negative point-plane corona *** pressure and the temperature of gas mixtures are 0.4 MPa and 300 K,*** CF_(4)content varies from20%to 80%.The 2D axisymmetric geometry with point-plane electrodes is investigated,and the three drift-diffusion equations are solved to predict the characteristics of the negative corona *** addition,Poisson’s equation is coupled with the above three continuity equations to calculate the electric *** order to calculate the electron impact coefficients,including the Townsend ionization and attachment coefficients,as well as the mobilities and diffusion coefficients for electrons,the two-term Boltzmann equation is *** characteristics of three ionic species at five stages of the first current pulse in 60%SF_(6)-40%CF_(4)and20%SF_(6)-80%CF_(4)mixtures are selected to discuss the development mechanism of current ***,the reduced electric field strengths at the corresponding time instants are presented to help understand the discharge *** current waveform and the total number of three species are compared in all the cases to analyze the effects of the CF_(4)content on the *** reduced electric field strength is also helpful in understanding the effects of CF_(4)*** the CF_(4)content increases to 80%,the discharge is more intensive and the pulse frequency also increases.

关键词： SF_(6)/CF_(4)mixtures negative corona discharge current pulses

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Effects of temperature and discharge parameters on ozone concentration of negative corona discharge

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Journal of Environmental Sciences 2003年第6期15卷 796-799页

作者： WANG Hai-jun SHENG Lian-xi XU De-xuan Department of Environmental Science and Engineering College of Urban and Environmental ScienceNortheast Normal UniversityChangchun 130024China.

The relationship of the ozone generation and the heating power, corona wire surface temperature, discharge electrode and netting electrode was studied during the negative corona discharge. The experimental results showed that the ozone concentration reduced with applied voltage decrease. With heating power increase, the ozone concentration of unit current decreased at exponential rate and it almost change no longer over 0.40 W. Under given temperature, the lower the applied voltage was, the smaller the ozone concentration was; while under given applied voltages, only over 11 kV could decrease with the surface temperature increase. The ozone concentration decreased with the lengthening of corona wire, and could reduced to 10 ppb under experimental condition of 14.2 kV; it also decreased with the shortening of wire diameter, and could decrease 67% at best in the given condition. Moreover, it decreased with the increasing size of netting electrode mesh. At the anion current of 1.65 μΑ, the ozone concentration of 5.0×5.0 cm 2 is only 41% of that of 3.3×3.3 cm 2.

关键词： ozone negative corona discharge anion current

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Review on ionization and quenching mechanisms of Trichel pulse

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Chinese Physics B 2021年第5期30卷 120-127页

作者： Anbang Sun† Xing Zhang Yulin Guo Yanliang He Guanjun Zhang State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical EngineeringXi'an Jiaotong UniversityXi'an 710049China

Trichel pulse is a kind of pulsed mode in negative DC corona discharge,which has attracted significant attention because of its considerable applications in *** eighty years,plenty of effort including simulations and experiments has been spent to reveal the ionization and quenching mechanisms of Trichel *** revisiting and summarizing the basic characteristics and well-accepted ionization and quenching mechanisms,this review provides a basic understanding and the current status of Trichel pulse.

关键词： Trichel pulse negative corona discharge DC discharge

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