交直流电压下油纸绝缘典型缺陷的局部放电特征  

Partial discharge characteristics of typical defects in oil paper insulation under AC and DC voltage

作　　者：田天 周秀 丁培 李秀广 罗艳 何宁辉 马飞越 杨鑫[2] TIAN Tian;ZHOU Xiu;DING Pei;LI Xiuguang;LUO Yan;HE Ninghui;MA Feiyue;YANG Xin(Electric Power Science Research Institute,State Grid Ningxia Electric Power Co.,Ltd.,Yinchuan 750002,China;School of Electrical&Information Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]国网宁夏电力有限公司电力科学研究院,宁夏银川750002 [2]长沙理工大学电气与信息工程学院,湖南长沙410114

出　　处：《电力科学与技术学报》2021年第6期40-46,共7页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金青年科学基金(51407013)。

摘　　要：油纸绝缘局部放电问题受到业内普遍关注,为探究在交直流复合电压下的局部放电特征,该文搭建测量平台,并设计气隙、悬浮、柱板沿面和针板放电4种油纸绝缘典型缺陷的放电模型。结合这4种局部放电的实验结果,分析发现:在不同的复合电压比例下,4种典型缺陷局部放电会发生不同的变化,前3种缺陷平均放电量在起始阶段与直流分量呈现负向变化的特征,与局放起始电压的关系呈正向变化特征。在交直流混合电压下,悬浮绝缘放电模型与其他3种典型缺陷的放电模型相比较,局部放电的起始电压明显增加,交流电压下的平均放电量降低。所得结果为利用局部放电试验判别换流变缺陷类型和电压形式对局放的影响提供基础数据。The problem of oil-paper insulation partial discharge has attracted widespread attention in the industry.In order to explore the characteristics of partial discharge under AC-DC composite voltage,this paper builds a measurement platform and designs four typical types of discharge model for oil-paper insulation defects:air gap discharge,suspension discharge,and cylindrical surface discharge models.The experimental results of these four kinds of partial discharges indicate that,the partial discharges of the four typical defects will change differently under different composite voltage ratios.The variation characteristic of average discharge for the first three defect types are opposite to which of DC component and positive to which of initial voltage at the initial period.Compared with the other three typical defects,the initial voltage of partial discharge in the suspended insulation discharge model under AC and DC mixed voltage is obviously increased,and the average discharge under AC voltage is reduced.The results obtained provide basic data for the application of partial discharge tests to determine the effect of the type of commutation transformer defect and the voltage form on the partial discharge.

关 键 词：换流变压器 油纸绝缘 交直流复合电压 局部放电特征 

分 类 号：TM863[电气工程—高电压与绝缘技术]