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Simulation Research of Axial Magnetic Field Vacuum Arc Plasma

Author: ZuoRongNi
Tutor: SunPeng
School: Shenyang University of Technology
Course: Motor and electrical
Keywords: Longitudinal magnetic field Vacuum arc Plasma MHD Simulation
CLC: TM561.5
Type: Master's thesis
Year: 2011
Downloads: 127
Quote: 0
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Abstract


The vacuum circuit breakers are widely used in the intermediate pressure transmission and distribution systems, and presents to the trend in the field of high voltage penetration. Therefore, more and more attention on the vacuum circuit breaker and its related technologies. Characteristics and control measures of the vacuum arc breaking vacuum circuit breakers designed and developed reasonable modeling and the correct simulation studies are an effective means of in-depth study of vacuum arc. This article will focus consider the longitudinal magnetic field in the vacuum arc plasma modeling and simulation studies, which provide a theoretical basis for the design of vacuum circuit breakers. The model on the basis of the analysis of the existing vacuum arc, considering the average number of ion charge, ion kinetic energy of the vacuum arc derived MHD model of the longitudinal magnetic field vacuum arc. Vacuum arc plasma is not in local thermodynamic equilibrium states, and collide with each other between the ion and electron energy exchange, modeling must be the ions and electrons are considered separately, the ion energy conservation equation and the electron energy conservation equation respectively, to solve the ion temperature and the electron temperature. In addition, taking into account the plasma as a conductive fluid in motion will generate a magnetic field, the magnetic field will in turn affect the flow of the plasma acting on the vacuum arc. Therefore, the calculation of the self-generated magnetic field is essential. In this paper, the magnetic vector potential method to solve the self-generated magnetic field. Longitudinal magnetic field vacuum arc magnetic fluid, the model is coupled to each other by a group of non-linear partial differential equations constitute the traditional analytical method can not solve this kind of problem, must be solved by numerical methods. In this paper, computational fluid dynamics software FLUENT arc model for solving platform application VC and custom macro function to its secondary development to achieve a numerical simulation study of the longitudinal magnetic field vacuum arc magnetic fluid, model, vacuum arc on the proliferation of small current state simulation analysis based on a longitudinal magnetic field to study the impact of important parameters of the vacuum arc plasma. Simulation results show that the influence of the longitudinal magnetic field on the plasma parameters of the small current vacuum arc with a large current vacuum arc situation is different in the case of a small current, as the longitudinal magnetic field increases, the diffusion of the vacuum arc-shaped suppressed, axis on the current density, electron temperature, ion temperature and plasma pressure are increased, thereby breaking a small current should not be too strong longitudinal magnetic field is applied for the longitudinal magnetic field type vacuum interrupter.

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CLC: > Industrial Technology > Electrotechnical > Electrical > Electrical switches,circuit breakers > Breaker > Interrupter circuit breakers, interrupter
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