110~1900μm水雾对棒-板长间隙雷电冲击放电特性的影响  

Influence of Water Spray with a Diameter of 110~1900μm on Lighting Impulse Discharge Characteristics of Long Rod-plate Gap

作　　者：陈宝辉 邓捷 吴传平 刘毓 方针 CHEN Baohui;DENG Jie;WU Chuanping;LIU Yu;FANG Zhen(State Key Laboratory of Disaster Prevention&Reduction for Power Grid Transmission and Distribution Equipment,Disaster Prevention and Reduction Center,State Grid Hunan Electric Power Company Limited,Changsha 410007,China;College of Electrical and Information Engineering,Changsha University of Science&Technology,Changsha 410114,China)

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

出　　处：《高电压技术》2021年第8期2964-2970,共7页High Voltage Engineering

基　　金：湖南省自然科学基金(2018JJ3004);国家电网公司科技项目(5216A019000M)。

摘　　要：水雾–空气两相体放电涉及到水雾带电灭火、云中闪电及其发展、雨雾降低放电电压等研究领域。为此利用雾滴直径为110~1900μm的消防水雾以及1.0~2.5 m的棒–板间隙,研究水雾对棒–板长间隙雷电冲击50%放电电压U50的影响。试验表明,当水雾雾滴直径<300μm时,水雾对间隙U50的影响不明显;当水雾雾滴直径>300μm时,水雾间隙U50明显低于空气间隙U50。且水雾对棒–板长间隙U50的影响存在极性效应:在所试验的条件范围内,水雾正极性U50较空气间隙正极性U50最大降幅为2.3%,而水雾负极性U50较空气间隙负极性U50最大降幅达16.7%。对棒–板空气间隙中存在水雾的静电场仿真表明,水雾雾滴直径越大,空气间隙的电场畸变越严重,促进间隙放电的发生。The research on water droplets-air two-phase mixture discharge involves the field of suppressing fires of electrical equipment using mists,initiation and growth of lighting in clouds,and decrease of surface flashover voltage caused by rain.Consequently,the influence of mist on the U50 of long rod-plate gap was studied using the mist with a diameter of 110~1900μm and a gap length of 1.0~2.5 m.When the droplets diameter of mist was less than 300μm,the influence of mist on the U50 of air gap was not distinct.When the droplets diameter of mist was greater than 300μm,the mist decreased the U50 of air gap clearly.Besides,the influence of mist on the U50 of air showed a polarity effect.The maximum decrease of positive polarity U50 of mist was 2.3%,compared with the positive polarity U50 of air;however,the maximum decrease of negative polarity U50 of mist was 16.7%,compared with the negative polarity U50 of air.The electrostatic field simulation of water droplets in the rod-plate air gap showed that,the greater the droplet diameter of mist was,the more serious the electric field distortion of the air gap was,which promoted the discharge.

关 键 词：水雾 雷电冲击 放电特性 雾滴直径 极性效应 灭火 

分 类 号：TM85[电气工程—高电压与绝缘技术]