不对称振荡波电压下绝缘内部气隙缺陷放电过程  

An Analysis of the Discharge Process of Internal Void Defects of Insulators under Asymmetric Oscillating Wave Voltage

作　　者：田敏 曹雯[1] 陈长江 刘泽 张家瑞 杜燕 申巍 TIAN Min;CAO Wen;CHEN Changjiang;LIU Ze;ZHANG Jiarui;DU Yan;SHEN Wei(School of Electronic Information,Xi’an Polytechnic University,Xi’an 710048,Shaanxi,China;State Grid Shaanxi Electric Power Research Institute,Xi’an 710054,Shaanxi,China)

机构地区：[1]西安工程大学电子信息学院,陕西西安710048 [2]国网陕西省电力有限公司电力科学研究院,陕西西安710054

出　　处：《电网与清洁能源》2024年第12期36-44,53,共10页Power System and Clean Energy

基　　金：陕西省科技厅重点研发计划一般工业项目(2024GX-YBXM-519)。

摘　　要：目前已有利用振荡波进行局部放电检测的研究,但对于振荡波电压下局部放电发展过程的研究还有待继续完善。制作了含内部气隙缺陷的交联聚乙烯(cross-linked polyethyene,XLPE)试样,搭建了工频交流和不对称振荡波电压下的局部放电实验平台;在等效频率相同的2种电压下对试样进行局部放电实验;采集和分析2种电压下的局部放电数据,提取局部放电特征参量并绘制(phase resolved partial discharge,PRPD)谱图。实验结果表明:在等效频率与外施电压幅值都相同的条件下,相同时长下不对称振荡波电压下的局部放电次数相较于工频交流电压下更少,放电幅值却更大;可以将单个周期不对称振荡波电压下的放电过程分为初始电子积累阶段、局部放电产生和维持阶段以及放电熄灭阶段;不对称振荡波中的低幅值振荡阶段增加了气隙缺陷积累电荷的概率,有利于缩短下一次振荡时的放电时延,从而激发出更高的放电量。There have been many studies on the partial discharge(PD)detection under oscillating waves voltage,but the development process of discharge under oscillating wave voltage still needs to be studied.In this study,we made cross-linked polyethylene(XLPE)insulation samples with internal void defects and built the PD experimental platform under power frequency AC voltage and asymmetric oscillating wave voltage;then we performed PD experiments on samples of the same equivalent frequency under the two voltages and collected and analyzed the PD data,so that the PD characteristic parameters could be extracted to make the phase resolved partial discharge(PRPD)patterns.The experiments show that under the same equivalent frequency and applied voltage amplitude,the number of discharges at the asymmetric oscillation wave voltage is less and the amplitude of the discharges is greater than those under the AC voltage for the same time duration.The discharge process under a single period of asymmetric oscillating wave voltage can be divided into three stages-the initial electron accumulation stage,the PD generation and maintenance stage,and the discharge extinction stage.The low-amplitude oscillation phase of asymmetric oscillation waves increases the probability of charge accumulation in internal void defect,which is conductive to shorten the discharge time delay at the next oscillation wave and excite a higher amount of discharge.

关 键 词：交联聚乙烯 不对称振荡波电压 气隙缺陷 局部放电 放电过程 

分 类 号：TM855[电气工程—高电压与绝缘技术]