电瓷避雷器Issue(3)：114-122,9.DOI:10.16188/j.isa.1003-8337.2024.03.015
500 kV紧凑型输电线路复合绝缘子均压环优化设计
The Optimization of Grading Ring for Composite Insulator in 500 kV Compact Transmission Line
摘要
Abstract
Due to the characteristics of the composite insulator's structure,the electric field distribution along the insulator surface is extremely uneven.When the humidity is high or condensation occurs,it is easy to cause corona discharge,which will accelerate the aging of the sheds and sheath in the composite insulator,and in severe cases,it can even cause flashover accidents.The installation of grading ring can shift local strong E-field,reduce the nonlinearity of potential distribution and uniform the electric field distribution.In this paper,the three-dimensional geometry model of practical tower,conductor and in-sulator is established.The electric field simulation calculation is carried out using finite element method based on a multi-physical field simulation software.The influence of grading ring radius,pipe radius and vertical position of the ring along the insulator on electric field distribution with configuration of using large and small grading ring both is studied using control variable method,and the optimized scheme of large and small grading ring configuration of single V-string in 500 kV compact line is obtained.It is in-dicated by the results that in the configuration of optimized grading rings,the electric field peak value on the surface of the sheds and sheath is limited to less than 4.45 kV/cm,and the electric field on the sur-face of the grading ring and end-fittings are less than 20 kV/cm.The electric field distribution along the surface of the composite insulator is effectively improved.At the same time,the visible corona test of the configuration of optimized grading rings is carried out.The results show that it satisfies the requirements of operation.The whole results provide a reference for the practical engineering project.关键词
500 kV紧凑型线路/复合绝缘子/均压环设计/电场分布/结构参数Key words
500 kV compact transmission line/composite insulator/optimization of grading ring/electric field distribution/structural parameters引用本文复制引用
王敩青,王红星,张瑞晨,李文荣,尹芳辉,王黎明..500 kV紧凑型输电线路复合绝缘子均压环优化设计[J].电瓷避雷器,2024,(3):114-122,9.基金项目
国家自然科学基金面上项目(编号:51977118).Project supported by National Natural Science Foundation of China(NSFC)(No.51977118). （编号:51977118）
