直流冰面局部电弧运动特性  

Motion Characteristics of DC Local Arc on Ice Surface

作　　者：朱梅林 蒋兴良[1] 刘延庆 王茂政 ZHU Meilin;JIANG Xingliang;LIU Yanqing;WANG Maozheng(Xuefeng Mountain Energy Equipment Safety National Observation and Research Station,Chongqing University,Chongqing 400044,China;State Grid Qingdao Power Supply Company,Qingdao 266002,China)

机构地区：[1]重庆大学雪峰山能源装备安全国家野外科学观测研究站,重庆400044 [2]国网青岛供电公司,青岛266002

出　　处：《高电压技术》2023年第5期1939-1948,共10页High Voltage Engineering

摘　　要：随着我国特高压输电线路的不断建设,覆冰地区绝缘子冰闪问题日益突出。然而目前针对冰面电弧运动特性的研究较少,导致覆冰绝缘子长串闪络机理不明确。为了弥补现有研究的不足,在多功能人工气候室利用冰柱进行局部电弧试验,采用超高速摄像机拍摄了直流冰面电弧产生、发展过程。结果发现,相比于负极性局部电弧,正极性局部电弧产生所需电压较低、时间长;冰面电弧弧足与冰面间存在多条长度、直径各不相同的放电分支,由弧足中心向周围扩散;直流冰面电弧发展过程中存在弧柱-弧柱放电和弧柱-冰面放电两种放电形式,二者的放电方向相反。With the continuous construction of UHV transmission lines in China,the problem of long insulator string ice flashover in icing area is becoming more and more prominent.However,the research on the motion characteristics of ice arc is rarely available in the literature,thus the flashover mechanism of long string of iced insulators is unclear.In order to solve the shortcomings of the existing research,local arc tests were carried out with ice column in the multi-functional artificial climate chamber,and the generation and development processes of DC local arc were captured using the ultra-high speed camera in this paper.The results show that,compared with the negative local arc,the generation of positive local arc requires lower voltage and longer time.It is found that there are many discharge branches with different lengths and diameters between the arc foot and the ice surface,which diffuse from the center of the arc foot to the surrounding.During the development of DC ice surface arc,there are two kinds of discharge forms,namely,arc column to arc column discharge,and arc column to ice surface discharge,and their discharge directions are opposite.

关 键 词：覆冰绝缘子 直流 局部电弧 运动特性 闪络 

分 类 号：TM216[一般工业技术—材料科学与工程] TM501.2[电气工程—电工理论与新技术]