基于辐射电磁波检测的电力变压器局部放电定位研究  

Study of Partial Discharge Location in Power Transformer Based on the Detection of Electromagnetic Waves

作　　者：唐志国[1] 李成榕[1] 黄兴泉[2] 王伟[1] 程序[1] 李君[1] 

机构地区：[1]高电压与电磁兼容北京市重点实验室(华北电力大学),北京市昌平区102206 [2]河南电力试验研究所,河南省郑州市450052

出　　处：《中国电机工程学报》2006年第3期96-101,共6页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50477040)~~

摘　　要：在局部放电特高频检测技术基础上，提出一种基于天线阵列技术和时间差算法的电力变压器局放定位新方法。研究了电磁波法的定位精度与检测频率的关系，提出1-5GHz的局放定位检测频带；对铁心、线圈模型对电磁波传播的影响进行了试验探讨；提出基于4阵元天线阵列检测的方式；设计了基于多样本互相关-移位-叠加-互相关的时延测量算法；最后开发了融合遗传算法的时间差法定位技术，试验验证了该技术的定位效果。结果表明，提出的检测频带、传感器阵列技术及时延算法有效地解决了铁心对定位的不利影响。实现了时延的自动测量并将时延测量精度提高到数十皮秒；通过把遗传算法与时间差算法有机结合成功实现了对单一局放源的定位，实验中定位精度可达数厘米。A new partial discharge （PD） location method in power transformer is presented based on time delay measurement of electromagnetic （EM） wave signals using antenna array. Firstly, the relationship between location resolution of EM wave method and the detecting frequency is discussed, and a new frequency band of 1 -5GHz is proposed for accurate PD location; Then, the effect of iron core model and transformer winding to the propagating time delay of EM wave is studied experimentally; At last, a 4-element antenna array and time difference algorithm for PD location are developed, the practical effect is tested through experiment. The results indicate that the method effectively avoid the adverse effect of the iron core to the time delay and realize accurate location to single PD source successfully, with the minimum error of only several centimeters.

关 键 词：电力变压器 局部放电 故障定位 传感器阵列 电磁波 

分 类 号：TM835[电气工程—高电压与绝缘技术]