When the voltage is not enough to break down in a non-uniform electric field,theionization phenomenon may be able to develop in the vicinity of the large curvatureelectrodes with the greatest strength electric field. The accumulation of the spacecharge br...[继续阅读]

    [1] Xueji Xu,Dingchang Zhu (1996) Gas discharge physics. Fudan University Press,Shanghai[2] Zhancheng Wu,Xijun Zhang,Youzhi Hu (2012) Gas discharge. National Defence IndustryPress,Beijing[3] Zhang Yan,Deheng Zhu(2002) High voltage insulation,2nd edn. Chin...[继续阅读]

    5.1.1.1 Monte Carlo Simulation Model for Electron Avalanchein a Single GasTo identify the movements of electrons during gas discharge,the following parameters should be recorded:① the initial states of the electrons,② the next collisiontime,③ the collisio...[继续阅读]

    We will introduce the programming process of the simulation. The present simulation code uses C programming language with the advantage of short computingtime [4].5.1.2.1 Initializing of the Simulated ElectronMonte Carlo method can simulate the actual mot...[继续阅读]

    5.1.3.1 Simulation of Avalanche Discharge in SF61. Cross sections of SF6The cross sections of SF6 includes momentum transfer,vibration excitation(threshold energy 0.095 eV),electric excitation (threshold energy 9.8 eV),ionization (threshold energy 15.8 eV...[继续阅读]

    In the case of weakly ionized gas,Boltzmann equation can be described aswhere f is the electron velocity distribution function,a=eE/m is the acceleration ofthe electric field,where e and m are the electron charge and mass,respectively,andE is the electric...[继续阅读]

    In this section,Boltzmann equation method is used to calculate electron swarmparameters of pure SF6 gas and SF6/CO2 gas mixtures by taking reliable collision cross sections of CO2 and SF6. Then,compare the calculated results with theexperimental results b...[继续阅读]

    [1] Itoh T. Musha T(1960) Monte Carlo calculations of motion of electrons in helium [J]. J PhysSoc Jpn 15:1675-1680[2] Skullerud H R(1968)The stochastic computer simulation of ion motion in a gas subjected to aconstant electric field [J]. Br Appl Phys (J ...[继续阅读]

    Actually,only the electric field between two parallel plate electrodes with edgeeffects eliminated can be called uniform. The gap distances of a uniform electricfield are rarely large in engineering. Because of the large gap distances,the requiredsizes of...[继续阅读]

    6.1.2.1 Basic Conceptions of Lightning DischargeAs Fig. 6.3 showed,lightning discharge is one of the discharge phenomena in theatmosphere which is formed by the accumulation of a large amount of electriccharge in thunderclouds. It can be classified into t...[继续阅读]