Effects of dynamic deformation of pendant water drops on the electric field between hollow porcelain insulator sheds under extreme rainfall  

作　　者：Yijie Sun Lin Yang Gaofeng Shang Zhiqiang Kuang Yifan Liao Yanpeng Hao Licheng Li 

机构地区：[1]School of Electric Power,South China University of Technology,Guangzhou,China [2]College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha,China

出　　处：《High Voltage》2022年第1期86-97,共12页高电压（英文）

基　　金：supported by the National Natural Science Foundation of China under Grant No.52077084.

摘　　要：Hollow porcelain insulators in substations are frequently confronted with rain flashovers under extreme rainfall.This study aims to investigate the spatial and temporal variation of electric fields between hollow porcelain insulator sheds affected by dynamic deformation of pendant water drops and effects of the dimensionless number of fluids,the Weber number(We)and the electric Bond number(BoE),on it for influencing factors'analysis.Flow‐electric field coupling simulations were carried out to compute the magnitude and the position of AC electric fields between the sheds.The results show that the maximum electric field at a point in time(Etmax)increases significantly after the breakup of the pendant water drop,and its position alters accordingly.For low We and BoE,the global maximum electric field(Egmax)increases with increasing We and BoE,respectively.It is much closer to the adjacent sheds and occurs later than Etmax at the breakup of the pendant water drop(Ebmax).By contrast,Egmax decreases in different degrees at high We and BoE,respectively.There is little difference between Egmax and Ebmax in the position and the occurring time.The influence mechanism on the maximum electric field and discharges and the relationship between discharges induced by the pendant water drop and rain flashover are discussed.

关 键 词：dynamic deformation electric field hollow porcelain insulators pendant water drop rain flashover 

分 类 号：TM216[一般工业技术—材料科学与工程]