摘要
输电线路跨越寒区,寒区海拔高,气压低的特殊环境对于输电设备短空气间隙放电的影响不能忽略.利用气体放电理论,结合伽略金(Galerkin)有限元法和微分方程弱形式,建立棒一板电极放电模型,模拟标准及较低气压下空气间隙流注放电过程,分析了低气压下棒一板短空气间隙放电过程及特性.仿真结果显示,随着气压的降低,流注发展激烈程度下降,初始放电区域缩小,流注通道中电子浓度减小,发展速度加快.
Tile transmission lines pass by the cold regions of high altitude and low air pressure.The influence made by the special circumstances on the breakdown of short air gap can not be ignored in cold regions. In this paper, a rod - plane electrode model which was established according to the gas discharge theory combined with Galerkin finite element method and weak form of finite element method （FEM）,was adopted to simulate the streamer discharge of short air gap under different pressures. The influence of low air pressure on the discharge of short air gap was analyzed systematically. The results showed that with the decrease of air pressure, electron density of the streamer channel decreased, the intensity of the streamer was declined and the initial area of the streamey was reduced and the propagation velocity increased.
出处
《数学的实践与认识》
北大核心
2015年第7期156-162,共7页
Mathematics in Practice and Theory
关键词
低气压
短空气间隙
流注放电
low air pressure
short air gap
streamer discharge
