Aging Characteristics on.Epoxy Resin Surface Under Repetitive Microsecond Pulses in Air at Atmospheric Pressure  

作　　者：谢庆 刘熊 章程 王瑞雪 饶章权 邵涛 

机构地区：[1]North China Electric Power University,Baoding 071003,China [2]Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100190,China [3]Electric Power Research Institute of Guangdong Power Grid Co.Ltd.,Guangzhou 510080,China

出　　处：《Plasma Science and Technology》2016年第3期325-330,共6页等离子体科学和技术（英文版）

基　　金：supported by the Natural Science Foundation of Hebei Province(No.E2015502081);National Natural Science Foundation of China(Nos.51222701,51307060);the National Basic Research Program of China(No.2014CB239505-3)

摘　　要：Research on aging characteristics of epoxy resin （EP） under repetitive microsecond pulses is important for the design of insulating materials in high power apparatus. It is because that very fast transient overvoltage always occurs in a power system, which causes flashover and is one of the main factors causing aging effects of EP materials. Therefore, it is essential to obtain a better understanding of the aging effect on an EP surface resulting from flashover. In this work, aging effects on an EP surface were investigated by surface flashover discharge under repetitive microsecond pulses in atmospheric pressure. The investigations of parameters such as the surface micro-morphology and chemical composition of the insulation material under different degrees of aging were conducted with the aid of measurement methods such as atomic force microscopy （AFM）, scanning electron microscopy （SEM）, and X-ray photoelectron spectroscopy （XPS）. Results showed that with the accumulation of aging energy on the material surface, the particles formed on the material surface increased both in number and size, leading to the growth of surface roughness and a reduction in the water contact angle; the surface also became more absorbent. Furthermore, in the aging process, the molecular chains of EP on the surface were broken, resulting in oxidation and carbonisation.Research on aging characteristics of epoxy resin （EP） under repetitive microsecond pulses is important for the design of insulating materials in high power apparatus. It is because that very fast transient overvoltage always occurs in a power system, which causes flashover and is one of the main factors causing aging effects of EP materials. Therefore, it is essential to obtain a better understanding of the aging effect on an EP surface resulting from flashover. In this work, aging effects on an EP surface were investigated by surface flashover discharge under repetitive microsecond pulses in atmospheric pressure. The investigations of parameters such as the surface micro-morphology and chemical composition of the insulation material under different degrees of aging were conducted with the aid of measurement methods such as atomic force microscopy （AFM）, scanning electron microscopy （SEM）, and X-ray photoelectron spectroscopy （XPS）. Results showed that with the accumulation of aging energy on the material surface, the particles formed on the material surface increased both in number and size, leading to the growth of surface roughness and a reduction in the water contact angle; the surface also became more absorbent. Furthermore, in the aging process, the molecular chains of EP on the surface were broken, resulting in oxidation and carbonisation.

关 键 词：microsecond pulses surface flashover epoxy resin aging characteristics 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业]