电场均匀性对细水雾短空气间隙工频放电特性的影响  

Influence of Electric Field Uniformity on Power Frequency Discharge Characteristics of Short Air Gap in Water Mist Condition

作　　者：陈宝辉 邓捷 孙易成 刘毓 Chen Baohui;Deng Jie;Sun Yicheng;Liu Yu(State Key Laboratory of Disaster Prevention&Reduction for Power Grid Transmission and Distribution Equipment,Hunan Electric Power Corporation Disaster Prevention and Reduction Center,Changsha 410007,China;College of Electrical and Information Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]电网输变电设备防灾减灾国家重点实验室(国网湖南省电力有限公司防灾减灾中心),长沙410007 [2]长沙理工大学电气与信息工程学院,长沙410114

出　　处：《电工技术学报》2021年第8期1734-1742,共9页Transactions of China Electrotechnical Society

基　　金：湖南省重点研发计划项目(2017SK2371);湖南省自然科学基金项目(2018JJ3004);国家电网公司重大项目(5216A0180006,5216A019000M)资助。

摘　　要：细水雾是一种绝缘性能较高的消防技术。利用球-球间隙模拟稍不均匀电场,利用棒-板间隙模拟不均匀电场,开展细水雾在球-球和棒-板短间隙下的工频放电特性及仿真分析研究。研究发现,球-球间隙下,细水雾雾滴产生的电场畸变影响大于细水雾雾滴在电场荷电的影响,细水雾球隙击穿电压总小于空气球隙击穿电压。当间隙距离为2~8cm时,细水雾击穿电压较同条件的空气击穿电压降低37.6%~38.2%。棒-板间隙下,随着电极间隙的增长,细水雾雾滴产生的电场畸变影响程度降低。间隙为3.5~8cm时,电场畸变的影响高于电场荷电的影响,细水雾间隙击穿电压低于空气间隙击穿电压6.0%~8.5%;间隙为12cm时,细水雾雾滴在电场荷电的作用超过了细水雾雾滴对电场畸变的影响,细水雾间隙的击穿电压甚至高于空气间隙击穿电压3.6%~4.4%。研究结果对细水雾在电力设备火灾防治中的应用具有指导作用。Water mist is a fire fighting technology with high insulation ability.The discharge characteristics of water mist under ball-ball gap and rod-plate gap were studied.For the ball-ball gap,the electrostatic field distortion caused by water mist droplets has greater influence than the charging of water mist particles in electrostatic field,and thus the breakdown voltage of water mist is always significantly lower than that of air gap.When the gap length is 2cm to 8cm,the breakdown voltage of water mist is 37.6% to 38.2% lower than that of air gap under ball-ball electrodes.For the rod-plate gap,the influence of electrostatic field distortion decreases with the increase of gap length.When the gap length is 3.5cm to 8cm,the effect of electrostatic field distortion is higher than that of charging of water mist particles in electrostatic field.Moreover,the breakdown voltage of water mist under rod-plate electrodes is 6.0%to 8.5%lower than that of air gap.When the gap length is longer than 12cm,the effect of charging of water mist particles in electrostatic field exceeds the effect of electrostatic field distortion caused by water mist,and the breakdown voltage of water mist under rod-plate electrodes is higher than the breakdown voltage of air gap by 3.6% to 4.4%.The results can provide guidance for the application of water mist in fire prevention of high voltage power equipment.

关 键 词：细水雾 球-球 棒-板 空气间隙 工频 击穿电压 

分 类 号：TM85[电气工程—高电压与绝缘技术]