真空中绝缘子闪络前表面电荷分布的二维仿真

于开坤 1; 张冠军 1; 郑楠 1; 赵文彬 1; 秋实 2

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真空中绝缘子闪络前表面电荷分布的二维仿真

专题研究 | 更新时间：2025-12-08

- 真空中绝缘子闪络前表面电荷分布的二维仿真
- 2-Dimensional Simulation of Surface Charge Distribution on Insulator Prior to Flashover in Vacuum
- 西安交通大学学报 2008年42卷第4期页码：476-480
- 作者机构：
  
  西安交通大学电力设备电气绝缘国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
  
  : 2007-07-12. 作者简介: 于开坤(1981-),男,博士生;张冠军(联系人),男,教授,博士生导师. 基金项目: 国家自然科学基金资助项目(50577054)
- DOI：
  中图分类号： TP301
- 网络首发：2008-04-10，
  
  纸质出版：2008
- 稿件说明：
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于开坤 1, 张冠军 1, 郑楠 1, 等. 真空中绝缘子闪络前表面电荷分布的二维仿真[J]. 西安交通大学学报, 2008,42(4):476-480.

于开坤 1, 张冠军 1, 郑楠 1, et al. 2-Dimensional Simulation of Surface Charge Distribution on Insulator Prior to Flashover in Vacuum[J]. 2008, 42(4): 476-480.
于开坤 1, 张冠军 1, 郑楠 1, 等. 真空中绝缘子闪络前表面电荷分布的二维仿真[J]. 西安交通大学学报, 2008,42(4):476-480. DOI：

于开坤 1, 张冠军 1, 郑楠 1, et al. 2-Dimensional Simulation of Surface Charge Distribution on Insulator Prior to Flashover in Vacuum[J]. 2008, 42(4): 476-480. DOI：

摘要

基于真空闪络的二次电子发射雪崩(SEEA)模型

针对片式有机玻璃PMMA和氧化铝陶瓷两种典型绝缘材料

利用蒙特卡罗法仿真研究了平面圆形及矩形对称电极系统中绝缘子表面电荷的二维分布.仿真结果表明:在靠近阴极处的绝缘子表面存在小范围的负电荷区

而后变为较大范围的正电荷区; 随外施电压的提高

绝缘子表面的正电荷区域及密度增大

而负电荷区域及密度减小; 二次电子发射系数较小的PMMA绝缘子表面正电荷密度较低; 由于圆形电极表面电场分布较矩形电极系统不均匀

其电荷密度分布更不均匀.将仿真结果与他人的实验结果进行了分析对比

发现两者比较接近.

Abstract

Based on the secondary electron emission avalanchemodel the Monte Carlo method is chosen to simulate the 2-dimensional surface charge distributions on PMMA and alumina wafers with planar circular and rectangle symmetrical electrodes

respectively. The results indicate that negative charges exist in a small surface region near the cathode and then turn to positive charges in a big surface region away from cathode

and the density and area of negative charges decrease with the increasing applied voltage

while the density and area of positive charges increase. For PMMA insulator with smaller secondary electric emission rate

its positive charge density gets lower. Compared with planar rectangle electrode

the surface electric field of insulator with circular electrode is more nonuniform

and the surface charge density distributes much more nonuniformly. The simulation results approximately agree with other researchers' experimental results.

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references

HAWLEY R.Solid insulators in vacuum: a review [J]. Vacuum,1968,18:383-389.

MILLER H C.Flashover of insulators in vacuum:review of the phenomena and techniques to improve hold off voltage [J].IEEE Transactions on Electrical Insulation, 1993,28:512-527.

NEUBER A,BUTCHER M,HATFIELD L L,et al.Electric current in dc surface flashover in vacuum [J].Journal of Applied Physics, 1999,85(6):3084-3091.

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丁立健,李成榕,王景春,等.真空中绝缘子沿面预闪络现象的研究 [J].中国电机工程学报,2001,21(9):27-32.

DING Lijian,LI Chengrong,WANG Jingchun,et al.Study on pre-flashover of alumina insulator in vacuum [J]. Proceedings of the CSEE,2001,21(9):27-32.

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Von SEGGERN H. Charging dynamics of dielectrics irradiated by low energy electrons [J]. IEEE Transactions on Nuclear Science, 1985,NS-32(4):1503-1511.

姚宗熙,郑德修,封学民.物理电子学 [M].西安:西安交通大学出版社,1991.

SUDARSHAN T S, CROSS J D, SRIVASTAVA K D. Prebreakdown processes associated with surface flashover of solid insulators in vacuum [J]. IEEE Transactions on Electrical Insulation, 1977,EI-12(3):200-208.

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