The results of numerical simulation of the effects of H₂O and O₂ impurities on the Trichel pulses characteristics in the negative point-plane corona discharge in SF₆ gas at 0.4 MPa is presented in this paper. The H₂O and O₂ contents varied from 200 ppm to 10,000 ppm. The continuity equations for three charged species along with Poisson’s equation were solved simultaneously to obtain the Trichel pulses characteristics in SF₆/H₂O mixtures and SF₆/O₂ mixtures. The reduced ionization coefficient, the reduced attachment coefficient, the electron mobility and the electron diffusion coefficient for SF₆/H₂O and SF₆/O₂ mixtures were determined by solving the two-term Boltzmann equation. The effects of H₂O and O₂ on the current pulses, the distributions of the charged species and the reduced electric field at the instants of the first and second peak pulse, the time-dependent total number of the three charged species in the gap and the reduced electric field at the discharge tip were investigated to determine the sensitivities of the Trichel pulses characteristics of the SF₆ to the H₂O and O₂ impurities.

给出了H ₂ O和O ₂杂质对0.4 MPa SF ₆气体负点平面电晕放电中Trichel脉冲特性影响的数值模拟结果。H ₂ O和O _2的含量在200ppm至10,000ppm之间变化。同时求解三种带电物质的连续性方程和泊松方程，以获得SF ₆ / H ₂ O混合物和SF ₆ / O ₂混合物中的Trichel脉冲特性。SF的降低的电离系数，降低的附着系数，电子迁移率和电子扩散系数通过求解二项玻尔兹曼方程确定₆ / H ₂ O和SF ₆ / O ₂混合物。H ₂ O和O ₂对电流脉冲的影响，第一和第二峰值脉冲瞬间的带电物质分布和减小的电场，间隙中三种带电物质的时间相关总数研究了放电尖端处的减小的电场，并确定了SF ₆的Trichel脉冲特性对H ₂ O和O ₂杂质的敏感性。