摘要
非合成绝缘子,如瓷质和玻璃绝缘子在输电线路中占有很大比重,提高其污闪电压对电网安全运行具有重要的意义。本文通过在绝缘子铁帽处增加一块金属环片以提高绝缘子串的闪络电压。金属环片能够减小绝缘子铁帽处的高场强,提高起晕电压及减小绝缘子表面场强的切向分量,抑制带电粒子发展,从而提高污闪电压。不同参数的金属环片对绝缘子串污闪电压的影响程度不同,本文利用有限元法(FEM)建立了110kV瓷质绝缘子串场强计算的三维模型,对金属环片的最优参数进行了设计,并通过污闪试验进行验证。试验结果表明,最优参数下绝缘子污闪电压有较大提升,在3级污秽条件下可提高25. 7%。
Non-synthetic insulator like porcelain or glass insulator occupies a large proportion in power transmission lines,therefore improving the flashover voltage of the insulator string is of great importance to the safe operation of the power grid.By adding a metal ring at the cap,the flashover voltage of polluted insulator can be enhanced.Adding the metal ring can not only reduce the high field intensity at the cap,raise the corona inception electric field and reduce the tangential component of the surface field strength of insulators,but also restrain the development of charged particles,thus the flashover voltage can be increased eventually.Since the influence of the metal ring with different parameters on the flashover voltage is different,in this paper,a three-dimensional model of field strength calculation of 110kV porcelain insulator string is established by the finite element method(FEM),and the optimum parameters are designed and proved by pollution flashover test.The test results show that the flashover voltage of insulators is improved greatly under the optimum parameters,and the pollution flashover can be increased by 25.7%under the third pollution condition.
作者
蔡礼
张瑞琪
谭学峰
陈俊武
钟丽梅
CAI Li;ZHANG Ruiqi;TAN Xuefeng;CHEN Junwu;ZHONG Limei(Nanchang Power Company of Jiangxi Grid Company,Nanchang 330000,China;School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;State Grid Jiangxi Electric Power Company,Nanchang 330000,China)
出处
《电瓷避雷器》
CAS
北大核心
2019年第2期231-236,共6页
Insulators and Surge Arresters
关键词
瓷质绝缘子
沿面切向场强
金属环片
有限元法
porcelain insulator
surface tangential electric field intensity
metal ring
finite element method
