Space Charge Characteristics of Oil-paper Insulation in the Electro-thermal Aging Process  

作　　者：Yuanxiang Zhou Chao Dai Meng Huang 

机构地区：[1]Department of Electrical Engineering,Tsinghua University,Beijing 10084,China [2]Electrical Engineering Department,Beijing Jiaotong University,Beijing 100044,China

出　　处：《CSEE Journal of Power and Energy Systems》2016年第2期40-46,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 by National Basic Research Program of China(973 Program)under Grant 2011CB209400。

摘　　要：High electric field and temperatures can result in electrical property degradation of oil-paper insulation and accelerate its aging process.This paper describes the regulation of space charge in the process of electro-thermal aging.Electric field distortion and differences in characteristic parameters during electro-thermal aging are analyzed,along with the effects of electro-thermal aging on space charge from the perspective of trap energy.High temperature and an electric field are used to accelerate the aging of oil-paper,and space charge characteristics are measured using the pulsed electro-acoustic(PEA)method throughout the electro-thermal aging.Based on results obtained,it can be concluded that homo-charge injection occurs at the anode and the type of the charge injection at the cathode varies throughout the electro-thermal aging;the decrease of permittivity during aging allows for space charge injection to take place;growth of trap depth makes the space charge accumulate in the middle of the sample;and space charge accumulation after electro-thermal aging results in inner electric field distortion,which leads to large current and decreased breakdown in voltages.

关 键 词：Electric field distortion electro-thermal aging homogeneous charge oil-paper insulation pulsed electro-acoustic(PEA)method space charge 

分 类 号：TG1[金属学及工艺—金属学]