电极覆盖短间隙大气压下N_2放电动力学特性  

Dynamic characteristics of the N_2 discharge in short-gap with dielectric-covered electrodes

作　　者：郑殿春[1] 张仲麟[1] 赵大伟[1] 张连星[1] 朱士华[1] 

机构地区：[1]哈尔滨理工大学电气与电子工程学院,黑龙江哈尔滨150080

出　　处：《电机与控制学报》2011年第12期50-55,共6页Electric Machines and Control

基　　金：国家自然科学基金(51077032)

摘　　要：为降低混合SF6/N2气体绝缘中SF6的含量,及对绝缘中空气气隙进行局部放电在线监测,以其主要成分氮气作为研究对象,建立一维自洽流体力学的气体放电模型,其中包括电子和离子的连续性方程和动量方程,且耦合了泊松方程,研究了短间隙氮气放电过程及其动力学特性。通过求解气隙放电的非线性方程组,得到了不同电压下氮气气隙放电的时间演化过程,并以二维和三维相图表现了内部放电参量的关系,仿真获得了电场、电子密度和正离子密度的时空分布,由计算结果可知,放电空间在电场强度超过临界值时会形成放电电流脉冲,使其经过短时傅里叶变换获得时频值图像可以较好地描述短间隙气体放电的特征。To reduce the purity of SF6 in mixed gas SF6 /N2 insulation and also in order to better go on online monitoring between insulating partial discharge of air gap,nitrogen as the main ingredients was focused on,meanwhile establishing one-dimensional and self-consistent fluid model of the gas discharge and concluding the electron and ion continuity and momentum transfer equations coupled to Poisson＇s equation,then the discharge process of the N2 gas in the short gap and its dynamics characteristic were researched.The time evolution process of N2 gas discharge at different voltages is obtained by solving nonlinear gas discharge equations,and the relation of internal discharge parameter is expressed by two and three dimensional phase diagram.The spatial and temporal distribution of electric field and the density of electron and ion were simulated,the result shows that discharge current pulse will be formed in discharge space when electric field outnumber critical value,and time-frequency image describes short gap discharge characteristic through short-time Fourier transform.

关 键 词：气体绝缘 流体模型 电场 

分 类 号：TM85[电气工程—高电压与绝缘技术]