盘型悬式绝缘子串自然覆冰直流放电发展路径特点及影响因素分析  

Analysis on the DC Discharge Path of Ice-Covered Disc Type Suspension Insulators under Natural Conditions

作　　者：舒立春[1] 刘延庆[1] 蒋兴良[1] 胡琴[1] 周龙武 Shu Lichun;Liu Yanqing;Jiang Xingliang;Hu Qin;Zhou Longwu(State Key Laboratory of Power Transmission Equipment&System Security and New Technology,Chongqing University,Chongqing 400044,China;Electric Power Research Institute of State Grid Jiangxi Electric Power Co.Ltd,Nanchang 330096,China)

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆400044 [2]国网江西省电力有限公司电力科学研究院,南昌330096

出　　处：《电工技术学报》2021年第8期1726-1733,共8页Transactions of China Electrotechnical Society

基　　金：国家电网公司项目(52182017000X);国家自然科学基金项目(51637002)资助。

摘　　要：绝缘子覆冰严重影响输电线路的安全运行,研究覆冰绝缘子放电发展路径有助于完善绝缘子覆冰放电理论。鉴于现有研究缺乏对盘型悬式绝缘子自然覆冰放电路径的系统分析,该文在现场进行绝缘子覆冰直流闪络试验,得到盘型悬式绝缘子雨凇覆冰和混合凇覆冰直流放电过程及放电路径的特点。研究结果表明:盘型悬式绝缘子雨凇覆冰闪络时,电弧总体从两端向中部发展;而混合凇覆冰放电过程中会出现多次电弧变暗或“熄弧”现象,且闪络路径分散性较大,电弧总是分段存在的,电弧的位置和数量具有随机性。此外,覆冰形态和自然风对盘型悬式绝缘子闪络放电路径有很大的影响,对于雨凇覆冰,覆冰程度越重,冰棱长度越长,电弧越易桥接;电弧会在风力的作用下产生漂移和变形而集中在覆冰绝缘子的背风面。Ice-covered insulator flashover seriously affects the safe operation of transmission lines.Studying the discharge path is helpful to improve the discharge theory of ice-covered insulators.However,existing researches lack a systematic analysis on the discharge path.For this reason,this paper carried out DC flashover tests of ice-covered disc type suspension insulators under natural conditions.The whole discharge process and the discharge characteristics were obtained.The results show that the arc generally develops from both ends to the middle during the glaze flashover process,while arc darkening or extinguishing may occur many times for mixed-phase ice.The flashover paths have great dispersion.The arc exists in segments with a random arc length and arc location.Moreover,the ice pattern and wind have a great influence on the discharge path.For glaze icing,the heavier the icing degree,the longer the icicle length is,and the easier the arc is bridged.The arc will drift and deform under the action of wind force,leading to the arc gathering on the leeward side.

关 键 词：盘型悬式绝缘子 自然覆冰 直流放电 发展路径特点 

分 类 号：TM85[电气工程—高电压与绝缘技术]