Research on formation and influence factors of weak insulation area of roof insulator
LIU Wenzheng
TIAN Jia
CHEN Xiuyang
CUI Weisheng
MA Chuanlong
Abstract：With effect of air humidity and solid pollution,partial surface discharge on roof insulator is a serious threat to the safety of electric multiple units(EMUs).According to theory of finite element analysis,three dimensional(3D) fluid field and electric field models of 25 kV roof insulator are set up.The effect of high speed air flow,droplets and contamination on weak insulation area of roof insulator is explored.Results show that discharge along insulator surface is more possible to occur on side surface and leeward area of insulator with higher flow velocity and lower air pressure at the high speed of EMUs.The electric field is distorted and partial electric field intensity around droplets rises after droplets and solid contamination are attached on the surface of insulator,making the bonded area of droplets,contamination,air and silicon rubber the new insulation weak area.
Keywords：roof insulatorelectric field distributionfluid field distributionfinite element analysisweak insulation area
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 100-105 )