基于不均匀系数的气体冲击击穿电压计算方法研究  

Calculation Method Research of Gas Breakdown Voltage Based on Un-uniform Factor

作　　者：马爱清[1] 肖兴恩 李峰[1] 

机构地区：[1]上海电力学院电气工程学院,上海200090

出　　处：《高压电器》2015年第4期36-39,共4页High Voltage Apparatus

基　　金：国家自然科学基金项目(51007055);上海市教育委员会科研创新项目(12YZ141);上海绿色能源并网工程技术研究中心项目资助(13DZ2251900)~~

摘　　要：针对高压电气设备气体绝缘,间隙的伏秒特性虽能全面反映冲击击穿特性,但求取繁琐,工程实际中常用50%冲击电压UBD,50%来表示间隙的冲击击穿特性。文中利用电场不均匀系数ζ本身的特性,提出一种基于ζ的气体冲击击穿电压值UBD,50%计算方法,并以0.4 MPa干燥空气和0.5 MPa氮气为例,结合数值仿真和有限次试验值,得到电场不均匀系数ζ与Emax,50%的函数关系,从而可以得到不均匀系数ζ不同时对应的UBD,50%,并对其计算结果进行了误差分析,误差在7%以内,从而验证了计算方法的有效性。For gas insulation of high voltage electrical equipment, U-t characteristic is able to fully reflect impulse breakdown characteristic of gap. Owing to take it complexly UBD,50%will be commonly used to describe the characteristic in engineering practice. In this paper, a computational method of gas impulse breakdown voltage UBD,50%has been proposed based on un-uniform factor of electric field. Considering dry-air with 0.4 MPa and N2 with 0.5 MPa as examples, a function relationship between electric field un-uniform factor ζ and a small amount of Emax,50%experimental values can be obtained by combining numerical simulation with experiment. UBD,50%can be calculated by the formula with the change of ζ. Finally the error of calculation results is analyzed. The error is less than 7% which verifies validity of the computational method.

关 键 词：不均匀系数 50%冲击电压 冲击击穿特性 数值计算 

分 类 号：TM744[电气工程—电力系统及自动化]