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There are great differences between vacuum discharge and common gas discharge. For short gap gas breakdown, the main reason can be explained as followings: electrons from the cathode emission are accelerated by the electric field and impact the anode which will release a lot of metal vapor. The ions produced by the collisions between metal vapor gas molecule and electron impact the cathode and secondary...
Based on the theories of fractal and gas discharge, microscopic morphology of vacuum arc, the process of arc formation and development of discharge channel in the vacuum circuit breaker are simulated. The effects of temperature and electromagnetic field on the arc are also considered. The opening stroke is 10 mm in our work. Voltage is 75 kV, and current is 1 kA. The effects of temperature on the...
Sulfur hexafluoride is a gas with high electronegativity. For its strong adsorption to the electrons, it is widely used in the gas insulation. A microscopic model is established in our work to study the motions of particles in sulfur hexafluoride gas. Particle in cell method is used to trace the motions of the charged particles and the collisions between electrons, ions and atoms are simulated by...
The formation of arc in high voltage equipment is an unbalanced gas disruption and the principles of it are important in apparatus switching. For the complexity of gas disruption principles, the modeling and computer simulations to the beginning of gas disruption are vital in this domain. Particle-in-cell method is adopted in our work to disperse the Boltzmann equation and build a mathematical model...
Gas discharge model of vacuum circuit breaker based on fractal theory is established. For reflecting the influence of the variation of electric field on the discharge development, the gas discharge process was simulated and analyzed. Moreover, the combination effect of the electric field and the random consideration on the discharge was investigated. The whole spatio-temporal evolvement behavior of...
A microscopic model is based in our study which adopted the particle-in-cell and Monte Carlo methods to simulate the behavior of the electrons at the beginning of the discharge. The distance between the plane electrodes in our study is 64 mm. The gas temperature is 300 K and the DC voltage applied to the electrode is 1000 V. We trace the motions of a large amount of the electrons and assembled average...
In order to certify the function of ion to the gas discharge, a model of direct current discharge of argon, which includes the elastic and charge exchange collisions between ions and neutral gases, is examined using the particle-in-cell (PIC)/Monte Carlo collision (MCC) simulation. The structure of our electrode is one dimension and for the velocity of the particles, three dimensions calculation is...
Based on the theories of arc and gas discharge, a novel hybrid arc model in vacuum circuit breaker is proposed, considering the factors influencing on the arc formation from both microcosmic and macroscopic views. The evolution from initial discharge channel forming with breakdown to steady arc state is simulated. The results show that the radii of discharge channels are enlarging and the shapes of...
A flat-plate and pin-plate electrode gas discharge model based on fractal theory has been established in this paper. And to show the influence of the variation of electric field on the discharge routine development, the whole gas discharge process has been simulated and quantificationally analyzed. Moreover, the combination effect of the electric field and the random consideration on the discharge...
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