海拔2200 m地区正极性操作冲击下大直径球-板间隙放电统计时延特性  

Statistical Time Delay Characteristics of Large Diameter Sphere-plane Gap Discharge Under Positive Switching Impulse Voltage at Altitude of 2200 m

作　　者：耿江海[1] 李天骄 王平[1] 丁玉剑 丁杨 俞华 GENG Jianghai;LI Tianjiao;WANG Ping;DING Yujian;DING Yang;YU Hua(Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense,North China Electric Power University,Baoding 071003,China;China Electric Power Research Institute,Beijing 100192,China;State Grid Xinjiang Electric Power Company Research Institute,Urumchi 830000,China;State Grid Shanxi Electric Power Company Research Institute,Taiyuan 030001,China)

机构地区：[1]华北电力大学河北省输变电设备安全防御重点实验室,保定071003 [2]中国电力科学研究院有限公司,北京100192 [3]国网新疆电力有限公司电力科学研究院,乌鲁木齐830000 [4]国网山西省电力公司电力科学研究院,太原030001

出　　处：《高电压技术》2022年第10期3910-3918,共9页High Voltage Engineering

基　　金：河北省自然科学基金(E2021502025)。

摘　　要：随我国“西电东送”电力发展战略不断推进,特高压直流输电工程所经地区海拔持续升高,研究高海拔下大直径球–板间隙放电特性对输电线路与设备的绝缘设计具有重要意义。为此搭建光电联合观测系统,在海拔为2200 m青海特高压试验基地开展0.6、1.3、1.6 m不同直径下球–板间隙正极性操作冲击放电试验。试验结果表明,在同一电极尺寸下,流注起始场强跃升与注入电荷量随统计时延变长而增大,流注持续时间变短;随球电极直径增大,流注逐渐成为放电过程中的主导,流注起始、升压及统计时延增大,起始时延分散性也随之增大,0.6 m直径球–板间隙起始、升压与统计时延分别为98.4、65.8、32.6μs,起始时延标准差为32.1μs,均小于直径为1.3 m及1.6 m的球–板间隙的值。结合临界体积模型分析可得,0.6、1.3、1.6 m直径下球–板间隙临界体积增长速率分别为0.627、2.909、3.494 dm3/μs,临界体积内平均场强在临界体积初始时刻分别为1955、1889.6、1796.9 kV/m。随球电极直径的增大,临界体积增长速率增大,临界体积内场强减小,其中,临界体积内平均场强是影响高海拔下初始流注统计时延的主要因素。With the continuous advancement of China’s“West-East Electricity Transmission Project”,the altitude of the area where the UHVDC transmission project passes continues to rise.It is of great significance to study the discharge characteristics of large-diameter sphere-plane long gap at high altitudes for the insulation design of transmission lines and equipment.In order to study the statistical time delay characteristics of the initial stage of sphere-plane gap discharge streamer,a photoelectric detecting system is established in this paper.The positive switching impulse voltage discharge tests of sphere-plane gap under different diameters of 0.6 m,1.3 m and 1.6 m were carried out in Qinghai UHV test base at an altitude of 2200 m,and the characteristic parameters such as instantaneous optical power,space electric field and high potential current during discharge development were obtained.The experimental results show that,at the same electrode size,the initial field intensity of streamer jump and the injected charge increase with the increase of statistical delay,and the duration of the streamer becomes shorter;With the increase of the diameter of the sphere electrode,the streamer gradually becomes the dominant in the discharge process.The streamer initiation,boost and statistical delay increase,and the dispersion of the initial delay also increases.The start,boost and statistical delay of 0.6 m diameter ball plate gap are 98.4,65.8 and 32.6μs,respectively,and the standard deviation of start delay is 32.1,which are all smaller than the ball plate gap of 1.3 m and 1.6 m diameter.Combined with the critical volume model,the critical volume growth rates of the ball plate gap under the diameters of 0.6 m,1.3 m and 1.6 m are 0.627 dm3/μs,2.909 dm3/μs and 3.494 dm3/μs,respectively.The average field strength in the critical volume at the initial time of the critical volume is 1955 kV/m,1889.6 kV/m and 1796.9 kV/m,respectively.The growth rate of the initial critical volume of the streamer increases significantly wi

关 键 词：高海拔 大直径球–板电极 流注 统计时延 临界体积 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM855