基于统计特征的变压器超高频局部放电信号识别与分析  

Identification and Analysis of UHF Partial Discharge Signal of Transformer Based on Statistical Characteristics

作　　者：苏群 周求宽 刘明军 唐志国[4] 张达[4] SU Qun;ZHOU Qiukuan;LIU Mingjun;TANG Zhiguo;ZHANG Da(State Grid Jiangxi Electric Power Limited Company Training Center,Jiangxi,Nanchang 330043,China;Electric Science Research Institute State Grid Jiangxi Electric Power Limited Company,Jiangxi Nanchang 330029,China;State Grid Jiangxi Electric Power Limited Company,Nanchang 330077,China;State Key Laboratory of Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China)

机构地区：[1]国网江西省电力有限公司培训中心,江西南昌330043 [2]国网江西省电力有限公司电力科学研究院,江西南昌330096 [3]国网江西省电力有限公司,江西南昌330077 [4]华北电力大学新能源电力系统国家重点实验室,北京102206

出　　处：《电子器件》2019年第6期1394-1398,共5页Chinese Journal of Electron Devices

基　　金：国家电网公司科技项目(52182018000K)

摘　　要：变压器中局部放电由于随机性强且易受外界干扰所以难以检测。基于120 MVA变压器进行长期超高频局部放电信号监测,通过放电信号绝对数量和相对分数两个特征量,从统计行为的角度分析了不同局部放电信号的统计行为特征。结果表明变压器中存在3种主要局部放电信号源,其中一种相对分数达48%的信号具有放电绝对数量多、幅值高、放电数量随时间变化稳定的特点,由此得出其主导了变压器中的局部放电活动。该分析方法能有效识别局部放电模式和放电行为特征。Partial discharge in transformer is difficult to detect because of its strong randomness and susceptibility to external interference.Based on 120 MVA transformer for long-term monitoring of UHF partial discharge signals,the statistical behavior characteristics of different partial discharge signals are analyzed from the point of view of statistical behavior by using absolute number and relative fraction of discharge signals.The results show that there are three main partial discharge signal sources in transformer,one of which has a relative fraction of 48%has the characteristics of large absolute quantity of discharge,high amplitude and stable variation of discharge quantity with time.It is concluded that it dominates the partial discharge activities in transformer.The analysis method can effectively identify the partial discharge mode and discharge behavior characteristics.

关 键 词：变压器局部放电 超高频局部放电监测 局部放电相位模式识别 统计行为 

分 类 号：TM855[电气工程—高电压与绝缘技术]