小间隙大电流真空电弧数值仿真(英文)  

Numerical Simulation of High-current Vacuum Arc in Short Gap

作　　者：向川 廖敏夫 董华军 黄智慧 邹积岩 

机构地区：[1]School of Electrical Engineering,Dalian University of Technology [2]School of Mechanical Engineering,Dalian Jiaotong University

出　　处：《高电压技术》2011年第11期2693-2699,共7页High Voltage Engineering

基　　金：Supported by National Natural Science Foundation of China(50537010,50977004)

摘　　要：The plasma status of vacuum arc before arc current zero,has a great influence on the interruption performance of the vacuum circuit breakers.In this paper,a vacuum arc model in a short gap was established based on the magnet hydrodynamic(MHD) and a common computational fluid dynamics(CFD) software was utilized to specially investigate the properties of this arc.The spatial distributions of plasma pressure,plasma density,ion axial velocity, and axial current density in front of the anode surface of vacuum arc in this case were obtained.Simulation results indicate that:from the cathode to the anode,both of the plasma pressure and the plasma density increase gradually,and the plasma axial velocity decreases gradually;the axial current density in front of anode has a large radial gradient, and the maximum value is still smaller than the threshold current density for the anode-spot formation,thus,the anode is still passive.The comparison between the plasma density of simulation and the CMOS images taken by the high-speed camera indicates that they are in reasonable agreement with each other and demonstrates the feasibility of the vacuum arc model.The plasma status of vacuum arc before arc current zero, has a great influence on the interruption perform- ance of the vacuum circuit breakers. In this paper, a vacuum arc model in a short gap was established based on the magnet hydrodynamic （MHD） and a common computational fluid dynamics （CFD） software was utilized to specially investigate the properties of this arc. The spatial distributions of plasma pressure, plasma density, ion axial velocity, and axial current density in front of the anode surface of vacuum arc in this case were obtained. Simulation results in- dicate that： from the cathode to the anode, both of the plasma pressure and the plasma density increase gradually, and the plasma axial velocity decreases gradually; the axial current density in front of anode has a large radial gradient, and the maximum value is still smaller than the threshold current density for the anode-spot formation, thus, the anode is still passive. The comparison between the plasma density of simulation and the CMOS images taken by the high-speed camera indicates that they are in reasonable agreement with each other and demonstrates the feasibility of the vacuum arc model.

关 键 词：CMOS image computational fluid dynamics(CFD) magnet hydrodynamic(MHD) model numerical simulation short gap vacuum arc 

分 类 号：TM501.2[电气工程—电器]