正极性电压下空间电荷对空气间隙放电击中点的影响  

Effect of Space Charge on Striking Points of Air Gap Discharge Under Positive Voltages

作　　者：詹花茂[1,2] 邓丽红[1,2] 郝丽霞 颜廷利[1,2] 

机构地区：[1]华北电力大学高电压与电磁兼容北京市重点实验室,北京102206 [2]华北电力大学新能源电力系统国家重点实验室,北京102206 [3]安康供电公司,安康725000

出　　处：《高电压技术》2011年第9期2211-2217,共7页High Voltage Engineering

基　　金：国家电网公司科技项目(SGKJ[2010]151)~~

摘　　要：人们对空间电荷对放电过程的影响研究较少,但很多试验现象体现了空间电荷的作用。为了研究空间电荷对放电击中点的影响,建立了试验平台,并用高速摄像机观测了放电现象。正极性直流与雷电冲击联合加压试验与正雷电冲击电压试验,体现了预加直流电压产生的空间电荷对放电击中点的影响;正极性操作冲击电压试验,研究了不同电压幅值下放电击中点的变化。试验结果表明:正极性雷电冲击电压下,预加直流在针电极附近产生的空间电荷对空间电场的畸变作用不显著;在正极性操作冲击电压下,随着电压幅值的增加,空间电荷对针电极头部电场的屏蔽作用有所提高,放电点远离针电极头部的距离加大。Although there was little research about the effect of space charge on discharge process,the influence of space charge was shown in many experimental phenomena.In order to study the effect of space charge on discharge striking points,the testing platform was set up and the discharge phenomena were observed by means of high-speed video camera.The effect of space charge generated by pre-adding DC voltage on discharge striking points was reflected by the combined voltage of positive DC voltage and lightning impulse voltage experiment.The positive switching impulse voltage test studied the change of discharge striking points at different voltage amplitudes.The test results demonstrate that there is no evident distortion effect of space charge around the needle electrode generated by pre-adding DC voltage on the space electric field under positive lightning impulse voltage.Influenced by the positive switching impulse voltage,with the increasing voltage amplitude,the shielding effect of space charge on the electric field of needle electrode head becomes stronger,and the distance between discharge striking points and needle electrode head becomes longer.

关 键 词：空间电荷 高速摄像机 联合加压 雷电冲击 操作冲击 放电击中点 

分 类 号：TM863[电气工程—高电压与绝缘技术]