Specific Position and Influence of Moisture in Newly-Installed Composite Insulators  

作　　者：Sida Zhang Li Cheng Ruijin Liao Yunfan Liu 

机构地区：[1]School of Electrical Engineering,Chongqing University,Chongqing,400044,China

出　　处：《CSEE Journal of Power and Energy Systems》2025年第1期440-446,共7页中国电机工程学会电力与能源系统学报(英文)

基　　金：supported in part by the National Natural Science Foundation of China(No.52077013);Science and Technology Project of Electric Power Research Institute of China Southern Power Grid Co.(No.066600KK52190015 and 1500002020030101JC00074).

摘　　要：Abnormal heating of composite insulators is a hidden threat to safe operation of transmission lines.Although moisture is considered the key factor leading to temperature rise in high humidity areas,specific position and diffusion path of moisture are unclear for newly-installed composite insulators.In this paper,microstructure analysis and moisture absorption tests are first conducted to find the specific position of the moisture.Also,an accelerated water penetration test is used to demonstrate influence of moisture on the temperature rise.Former experiments find that moisture is concentrated at voids near the interface and surface of the Aluminum hydroxide(ATH)particles in housing material.For newly-installed composite insulators,moisture could spread to voids through failed fitting sealing and interface bonding,however,permeation through the housing is invalid.Later tests find that moisture at the surface of ATH could increase temperature at the high-voltage end and moisture in the void could lead to an additional heating area outside the high-voltage end.Temperature rise of additional heating area is dependent on length of the unbonded interface next to fitting.According to results of finite element simulation,the additional heating area is caused by increase of electric field strength at both ends of the moisture area.The additional heating area outside the high-voltage end could be used as a feature of sealing and the bonding defect of newly-installed composite insulators.

关 键 词：Composite insulation dielectric heating failure analysis inference mechanisms 

分 类 号：TM215[一般工业技术—材料科学与工程] TM726[电气工程—电工理论与新技术]