高压输电线路复合绝缘子发热机理的研究  

Research on Abnormal Heat of Composite Insulator in High Voltage Transmission Power Line

作　　者：魏远航[1] 陈润华[1] 

机构地区：[1]广东电网公司佛山供电局,佛山528000

出　　处：《高电压技术》2007年第5期25-28,共4页High Voltage Engineering

摘　　要：为了检测复合绝缘子的绝缘缺陷,有效防范复合绝缘子的贯穿性击穿事故和脆断事故的发生,在分析复合绝缘子发热机理的基础上,通过在实验室拍摄有模拟缺陷和来自现场的有真实缺陷的复合绝缘子的热像图,研究了复合绝缘子内部局部放电、渗入缺陷的水分的介质损耗、护套严重老化绝缘电阻下降的电阻损耗等引起的发热现象及其规律。研究表明,这3种发热现象具有代表性,输电线路中复合绝缘子的发热机理以第3种为主。The insulation breakdown fault and brittle fracture of composite insulators can be avoided efficiently by online inspecting defects. The insulation breakdown fault of composite insulators in service was introduced, and probable reasons of insulator heating were analyzed. Through taking the thermograph of two kinds of defect composite insulators in the laboratory, one from the site and another by simulating, three kinds of abnormal heating principle and phenomena were studied, such as the heat caused by partially internal discharge, the heat caused by medium loss with infiltration of humidity and the heat caused by insulation resistance decrease with severely aged insulator ring. Based on the infrared images of the composite insulators containing simulated defects and those containing real defects, these images with both electric field distribution curves and dissection results were compared and analyzed. The research results show that the three heating phenomena are ordinary and representative, and the third one is the main heating mechanism of the composite insulators used in transmission lines. The general reason that the composite insulators produce heat is explained. The investigation result is help for inspecting the electrified composite insulator.

关 键 词：复合绝缘子 红外热像图 绝缘缺陷 在线检测 击穿 发热机理 

分 类 号：TM216[一般工业技术—材料科学与工程] TM85[电气工程—电工理论与新技术]