显微结构对瓷绝缘子钢脚力学性能及运行可靠性的影响  

Effects of Microstructures on Mechanical Properties and Service Reliability of the Steel Pin Balls of Disc Type Suspension Insulators

作　　者：王万里 缪春辉 王若民 陈国宏 李坚林 汤文明[1] WANG Wanli;MIAO Chunhui;WANG Ruomin;CHEN Guohong;LI Jianlin;TANG Wenming(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China;Electric Power Research Institute,Anhui Electric Power Co.,Ltd.,State Grid,Hefei 230601,China;Anhui Electric Power Co.,Ltd.,State Grid,Hefei 230022,China)

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009 [2]国网安徽省电力有限公司电力科学研究院,合肥230601 [3]国网安徽省电力有限公司,合肥230022

出　　处：《电瓷避雷器》2022年第2期175-182,共8页Insulators and Surge Arresters

基　　金：国网安徽省电力有限公司科技项目(编号:52120518001Z)。

摘　　要：输电线路线盘形悬式绝缘子掉串事故大多源于钢脚球头部位的断裂。在对国内两个厂家的4种盘形悬式绝缘子用钢脚开展成分、显微组织结构及力学性能测试分析的基础上,采用有限元分析软件对相应钢脚进行静力学分析及疲劳寿命计算。研究表明,这4种钢脚均含有氧化物、硫化物夹杂物及大块的铁素体,力学性能达不到相关国家标准的要求。有限元模拟证实在绝缘子服役条件下,钢脚球头部位存在应力集中,导致钢脚疲劳寿命降低。钢脚材料冶金质量不佳,不合理热处理工艺下显微组织不良,加之在导线覆冰、舞动等恶劣条件下,钢脚球头部位承受大的循环应力,最终导致钢脚疲劳断裂。Most of the dropping accidents of the disk-type suspension porcelain insulators in the transmission line usually is attributed to the fracture of the steel pins of the insulators. After testing and analyzing on compositions, microstructures and mechanical properties of four kinds of steel pins of disk suspension porcelain insulators fabricated by two domestic manufacturers, static analysis and fatigue life calculation of the steel pins were carried out using a finite element software. The results show that these four kinds of steel pins contain oxide, sulfide inclusions and large ferrites, resulting in their mechanical properties cannot meet the requirements of the relevant national standards. According to the finite element simulation, it was determined that under the service condition of the insulators, the stress concentration exists in the balls of the steel pins, leading to decline of the fatigue life of the steel pins. Under the adverse conditions of conductor icing, galloping, etc., the balls of the steel pins undertake large cyclic stresses, which likely induce the fatigue fracture of the steel pins with poor metallurgical qualities and microstructures due to unreasonable heat treatment processes.

关 键 词：盘形悬式绝缘子钢脚 显微组织 力学性能 疲劳寿命 有限元模拟 

分 类 号：TM216[一般工业技术—材料科学与工程]