500kV高压直流穿墙套管端部机械连接故障检测与分析  

Detection and Analysis of Mechanical Connection Fault at the Terminal of 500 kV HVDC Wall Bushing

作　　者：韦晓星[1] 张晋寅[1] 夏谷林[2] 刘青松[1] 孙勇[1] 阳少军[2] 

机构地区：[1]中国南方电网超高压输电公司检修试验中心,广州510663 [2]中国南方电网超高压输电公司,广州510663

出　　处：《电瓷避雷器》2017年第4期171-177,共7页Insulators and Surge Arresters

摘　　要：对一支500 k V直流穿墙套管进行年度预试,发现SO2含量和直流回路电阻超标,解体后发现套管端部存在机械连接故障。提出了采用工业内窥镜检测方法,并成功应用于同类型套管故障的排查工作;通过检测和分析运输前和运输后一备用套管端部机械连接结构状态,得出运输过程中的振动冲击是造成套管发生机械连接故障的主要原因。It is found that excessive levels of SO2 and DC loop resistance during the annual preventive tests of a 500 kV wall bushing. After disassembling, a mechanical connection fault is found at both terminals of the bushing. A method for detecting the mechanical connection failure at the end terminal of bushing by using industrial endoscope is proposed. Meanwhile this new method has been successfully used in detecting the similar failure in the other wall bushings of same type. Finally, by the eontrastive analysis of splanchnoseopy results of a spare wall bushing before and after transportation, the vibration and impact during the transportation of the wall bushings is the main reason of the mechanical connection failure.

关 键 词：穿墙套管 机械连接故障 故障检测方法 工业内窥镜检测 振动冲击 

分 类 号：TM216.5[一般工业技术—材料科学与工程] TM721.1[电气工程—电工理论与新技术]