高频电老化过程中油纸绝缘表面电荷积聚消散特性  

Accumulation and Decay Characteristics of Charges on Oil-Paper Insulated Surface Under High Frequency Electrical Aging Process

作　　者：吴楠 李晓楠 李赫 蒋鹏 李奕萱 WU Nan;LI Xiaonan;LI He;JIANG Peng;LI Yixuan(CRRC Changchun Railway Vehicles Co.,Ltd.,Changchun 130062,China;School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中车长春轨道客车股份有限公司,长春130062 [2]西南交通大学电气工程学院,成都610031

出　　处：《南方电网技术》2022年第7期40-45,75,共7页Southern Power System Technology

基　　金：国家自然科学基金资助项目(52007158;51907167)。

摘　　要：随着电力电子器件朝着高频率、大功率、轻量化发展,高频成为导致高频变压器绝缘失效的重要原因之一。搭建了高频电老化实验系统,采用表面电位衰减法测量了不同电老化程度油纸绝缘表面电荷积聚与消散特性。结果表明,随着施加频率的增加,绝缘纸表面积聚电荷量下降,电荷衰减率呈先上升后下降的趋势。高频老化后,油纸绝缘表面电荷积聚与衰减率随老化程度的增加而下降。频率小于5 kHz时,绝缘纸表面高频致热效应起主导作用,频率大于5 kHz时,高频导致的电荷耗散时间起主导作用,导致表面电荷衰减率呈先上升后下降趋势。随着高频电老化程度的增加,油纸绝缘初始电子产生概率下降。探明表面电荷积聚与消散特性为揭示高频下油纸绝缘电老化机制提供了理论基础。With the development of power electronic devices towards high frequency, large power and lightweight, high frequency becomes one of the important reasons of the high frequency transformers failures. In this paper, a high-frequency electrical aging experiment system is built, and the surface potential attenuation method is used to measure the surface charge accumulation and attenuation characteristics of oil paper insulation with different aging degrees. The results show that as the applied frequency increases, the amount of charge accumulated on the surface of the insulating paper decreases, and the charge attenuation rate increases first and then decreases. After high-frequency aging, the surface charge accumulation and attenuation rate of oil-paper insulation decreases with the increase of aging degree. When the frequency is lower than 5 kHz, the high-frequency heating effect on the surface of the insulating paper plays a leading role, and when the frequency is higher than 5 kHz, the charge dissipation time caused by the high frequency plays a leading role, causing the surface charge attenuation rate to increase first and then decrease. As the degree of high-frequency electrical aging increases, the probability of initial electron generation of oil-paper insulation decreases. Understanding the characteristics of surface charge accumulation and dissipation provides a theoretical basis for revealing the electrical aging mechanism of oil-paper insulation under high frequency.

关 键 词：高频方波 油纸绝缘 NOMEX纸 电老化 电荷积聚 电荷衰减 

分 类 号：TM411[电气工程—电器]