基于PIC法SF_6/N_2混合气体中绝缘子沿面放电特性研究

摘要

The plasma kinematical equation is used in study of the mechanism of partial discharge through the particle-in-cell method（PIC） simulation of the gas discharge along the insulator surface in SF6/N2 gas mixtures.Through the 2-D poisson equation,the finite element（FEM） method is used to solve the electric field,and leap-frog method is adopted to track the movement of particles and the Monte Carlo model（MCM） is applied to simulate the process of particle collision.The simulation of dynamic discharge process in the environment of two-dimensional SF6/N2 mixed-gas is achieved,which includes ionization,attachment,recombination and photoionization.In this paper,through computer simulation of charged particles by the force build-up to the insulator surface,the development process is demonstrated.It＇s great significance to study the mechanism of surface charge accumulation and its impact on the gas discharge along the insulator surface in SF6/N2 gas mixtures.%利用等离子体运动学方程,通过粒子网格法（PIC）对SF6/N2混合气体中绝缘子沿面放电过程进行仿真,研究其局部放电机理。通过二维泊松方程,应用有限元（FEM）方法求解电场,采用蛙跳格式（leap-frog）跟踪粒子的运动。采用蒙特卡罗碰撞模型模拟粒子的碰撞过程,实现二维环境下SF6/N2混合气体放电过程动态仿真。模拟过程中考虑了电子与SF6、N2中性粒子的电离、吸附、复合以及光电离等过程。通过模拟展现了带电粒子受力积聚到绝缘子表面发展过程,对研究绝缘子表面电荷的积聚机理及其对SF6/N2混合气体中绝缘子沿面放电发展的影响具有重要意义。