电工技术学报  2016, Vol. 31 Issue (19): 199-207    DOI:
高电压与绝缘技术 |
频变电应力下高频电力变压器绝缘沿面放电形态及发展过程
刘涛1,韩帅2,李庆民1,鲁旭3,黄旭炜4
1.新能源电力系统国家重点实验室华北电力大学 北京 102206;
2.中国电力科学研究院 北京 100192;
3.国网北京市电力公司石景山供电公司 北京 100043;
4.北京市高电压与电磁兼容重点实验室华北电力大学 北京 102206
Patterns and Development of the Surface Discharge of High Frequency Power Transformer Insulation Under Frequency-Dependent Electric Stress
Liu Tao1, Han Shuai2, Li Qingmin1, Lu Xu3, Huang Xuwei4
1.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China;
2.China Electric Power Research Institute Beijing 100192 China;
3.State Grid Beijing Shijingshan Electric Power Supply Company Beijing 100043 China;
4.Beijing Key Laboratory of High Voltage and EMC North China Electric Power University Beijing 102206 China
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摘要 沿面放电是导致绝缘失效的主要原因之一。为研究高频电力变压器绝缘在频变电应力下的沿面放电形态及发展过程,搭建了高频沿面放电实验平台。首先在10~40 kHz正弦电压下,测试了不同频率下的沿面放电起始、闪络电压及沿面寿命,然后采用恒压法开展沿面放电实验,记录了放电起始、发展至闪络的整个过程,获得了不同阶段的放电特征参量和放电相位谱图,并结合二次电子发射雪崩模型和陷阱理论,对沿面放电的发展演化过程进行了分析。实验及分析结果表明,电压频率的升高会导致沿面闪络电压的降低和沿面寿命的缩短;高频下聚酰亚胺的沿面放电形态为直线型,在放电的不同阶段,放电幅值、次数、相位谱图及其统计量均呈现出特定的变化规律,可作为沿面放电发展程度的评估指标;绝缘表面电荷分布和陷阱参数对沿面放电特性有重要影响,是进一步揭示沿面闪络机理的关键。
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刘涛
韩帅
李庆民
鲁旭
黄旭炜
关键词 高频电力变压器高频正弦电压频变电应力沿面放电放电形态    
Abstract:Surface discharge is one of the main causes of insulation failures.In order to investigate the patterns of surface discharge and its evolution process in high frequency power transformers,an experimental platform with high frequency voltage source was built.First,the surface discharge inception voltage,the flashover voltage,and the insulation life were tested under sinusoidal voltage of different frequencies from 10 kHz to 40 kHz.Then,with the constant sinusoidal voltage value,surface discharge tests were conducted to observe the entire evolution process of the surface discharge including its initiation,development,and the ultimate flashover,along with the characteristic parameters and phase resolved spectra at different discharging stages. At last,the evolution process was analyzed based on the secondary electron emission avalanche model and the trap theory.Experimental results and analyses indicate that:the surface flashover voltage and the insulation life will be decreased with the increase of the voltage frequency;the surface discharge of polyimide film approximately develops in a straight line under high frequency;the discharge amplitude,discharge number,phase resolved spectrum,and corresponding statistical parameters show specific variation trend at different evolutionary stages,which can utilized as the evaluation index of the development degree for surface discharge; the charge distribution and the trap parameters on the insulation surface are the key issues to reveal the inherent mechanism of surface flashover,since they have important effects on surface discharge characteristics.
Key wordsHigh frequency power transformer    high frequency sinusoidal voltage    frequency-dependent electric stress    surface discharge    discharge pattern   
收稿日期: 2015-07-12      出版日期: 2016-11-02
PACS: TM215  
基金资助:国家自然科学基金(51477051,51628701)和中央高校基本科研业务费专项资金(2016XS08)资助项目。
作者简介: 刘 涛 男,1990年生,博士研究生,研究方向为高频绝缘及放电物理。E-mail:ltxingyu@126.com李庆民 男,1968年生,教授,博士生导师,研究方向为高电压与绝缘技术、放电物理等。E-mail:lqmeee@ncepu.edu.cn(通信作者)
引用本文:   
刘涛,韩帅,李庆民,鲁旭,黄旭炜. 频变电应力下高频电力变压器绝缘沿面放电形态及发展过程[J]. 电工技术学报, 2016, 31(19): 199-207. Liu Tao, Han Shuai, Li Qingmin, Lu Xu, Huang Xuwei. Patterns and Development of the Surface Discharge of High Frequency Power Transformer Insulation Under Frequency-Dependent Electric Stress. Transactions of China Electrotechnical Society, 2016, 31(19): 199-207.
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