摘要
现有研究表明,国内外学者对覆冰绝缘子闪络特性及放电机理的研究大多基于人工气候室内的覆冰试验完成。人工气候室模拟的环境条件和自然环境有较大区别,绝缘子的工况也有所不同。以不同型式和结构的4种绝缘子长串为研究对象,在雪峰山覆冰试验站对其开展了自然覆冰环境下的交流闪络试验,得到了绝缘子长串在不同污秽度和覆冰程度下的交流闪络电压,并拍摄了其放电过程及电弧发展现象。研究结果表明:覆冰绝缘子长串的闪络电压随冰重、盐密呈负幂指数的下降;盐密对玻璃绝缘子冰闪电压的影响指数为0.212~0.294,对于瓷绝缘子为0.184~0.322。在绝缘子长串自然覆冰的放电过程中,电弧熄灭重燃现象明显,飘弧现象严重。
Existing research shows that most scholars at home and abroad have studied the flashover characteristics and discharge mechanism of ice-coated insulators based on the indoor ice-coating tests in artificial climate.The environmental conditions simulated in the artificial climate chamber are quite different from the natural environment,and the working conditions of the insulators are also different.In addition,most of the ice discharge models of insulators established at home and abroad have not been verified in the test of long strings of insulators.In this paper,four types of long strings of insulators of different types and structures are taken as the research objects.The AC flashover test under the natural ice environment is carried out at the Xuefeng Mountain ice coating test station,and the AC flashover voltages of the long strings of insulators with different pollution degrees and ice coatings are obtained,and the discharge process and arc development phenomenon are photographed.The results show that the flashover voltage of the long string of ice-covered insulators decreases with ice weight and salt density in a negative power exponent;the influence index of the salt density on the ice flash voltage of glass insulators is 0.212~0.294,and of porcelain insulators 0.184~0.322.During the discharge process of a long strings of insulators naturally covered with ice,the phenomenon of arc extinction and reignition is obvious,and the phenomenon of arc drift is serious.
作者
何昱燊
张志劲
傅海涛
武剑
郑凯
蒋兴良
HE Yushen;ZHANG Zhijin;FU Haitao;WU Jian;ZHENG Kai;JIANG Xingliang(Maintenance Company of State Grid Chongqing Electric Power Company,Gaoxin District,Chongqing 400039,China;State Key Laboratory of Power Transmission Equipment&System Security and New Technology,(Chongqing University),Shapingba District,Chongqing 400044,China)
出处
《电网技术》
EI
CSCD
北大核心
2021年第7期2904-2912,共9页
Power System Technology
基金
国家自然科学基金项目(51677013)
国家电网有限公司科技项目(SGCQJX00YJJS1900591)。
关键词
自然环境
绝缘子长串
交流
闪络电压
闪络过程
电弧现象
natural environment
long insulators strings
AC
flashover voltage
flashover process
arc phenomenon
