4.2.2 Discharge Process in Non-uniform Electric Field

    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......查看详细>>

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References

    [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......查看详细>>

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5.1.1 Introduction of General Monte Carlo Simulation

    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......查看详细>>

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5.1.2 Monte Carlo Simulation of Electron Avalanche Development

    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......查看详细>>

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5.1.3 Electron Swarm Parameters from Monte Carlo Simulation

    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......查看详细>>

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5.2.1 Introduction to Boltzmann Equation Method

    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......查看详细>>

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5.2.2 Electron Swarm Parameters Calculated by Boltzmann Equation Method

    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......查看详细>>

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References

    [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 ......查看详细>>

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6.1.1 Breakdown Characteristics Under Continuous Voltages

    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......查看详细>>

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6.1.2 Breakdown Characteristics Under Lightning Impulse Voltages

    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......查看详细>>

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