电网支柱瓷绝缘子的温度循环效应和断裂失效影响分析  

Analysis of temperature cycle effect and fracture failure of pillar porcelain insulator in power grid

作　　者：赵洲峰 郭锋 赵峥 鲁旷达 付军[3] ZHAO Zhoufeng;GUO Feng;ZHAO Zheng;LU Kuangda;FU Jun(State Grid Zhejiang Electric Power Co.,Ltd.,Electric Power Research Institute,Hangzhou 310014,China;State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310007,China;State Key Laboratory of Silicate Materials for Architectures&School of Transportation,Wuhan University of Technology,Wuhan 430063,China)

机构地区：[1]国网浙江省电力有限公司电力科学研究院,杭州310014 [2]国网浙江省电力有限公司,杭州310007 [3]武汉理工大学交通学院&硅酸盐建筑材料国家重点实验室,武汉430063

出　　处：《中南民族大学学报（自然科学版）》2022年第4期392-398,共7页Journal of South-Central University for Nationalities：Natural Science Edition

基　　金：国家自然科学基金资助项目(51502219);国网浙江省电力有限公司科技资助项目(SGTYHT/18-JS-208)。

摘　　要：为提高瓷绝缘子服役性能的安全可靠度,降低电网突发性故障风险,对照分析了同批次的6支电瓷支柱绝缘子,分别进行温度循环和机械破坏试验,并进行了有限元仿真验算.试验结果表明:多次冷热循环处理后,电瓷绝缘子防水密封胶发生膨胀并析出,沥青缓冲层脱落缺失,弯曲破坏负荷有明显的下降.有限元模拟分析表明:冬季的温度应力在数值上远大于夏季,‒22℃极限低温作用下应力最大值达54.7 MPa,超过了瓷柱的极限强度(50 MPa).在机械破坏试验等效结构荷载以及沥青缓冲层缺失共同作用下,瓷柱的最大应力可高达53.89 MPa,在法兰口界面容易发生断裂,与试验结果相吻合.To improve the safety and reliability of the service performance of porcelain insulators and reduce the risk of sudden grid failures,temperature cycle and mechanical damage tests of six pillar porcelain insulators in a same batch were carried out successively,and the finite element simulation was carried out.The test results showed that after multiple cooling and heating cycles,the waterproof sealant on the glue-mounted cement swelled and dropped off together with the asphalt buffer layer,and the bending failure load was significantly reduced.The finite element simulation results showed that the temperature induced stress in winter was much larger than that in summer,and the maximum stress under the extreme low temperature of‒22℃ was 54.7 MPa,which exceeded the strength limit of the porcelain column(50 MPa).Under the combination of the equivalent structural load in the mechanical failure and with the absence of the asphalt buffer layer,the maximum stress of the porcelain column could reach as high as 53.89 MPa,and was prone to fracture at the flange interface,which was consistent with the simulation results.

关 键 词：支柱瓷绝缘子 温度循环 有限元仿真 应力分析 

分 类 号：TM203[一般工业技术—材料科学与工程]