变电站局部放电的定向天线多方位检测定位方法  

Partial Discharge Localization Method by Multi-direction Measurement Using Directional Antenna in Substation

作　　者：周文俊[1] 李鹏飞[1] 杨帅[1] 刘宇舜[1] 田妍 王勇 

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]广州供电局有限公司,广州510620

出　　处：《高电压技术》2017年第5期1476-1484,共9页High Voltage Engineering

基　　金：广州供电局有限公司科技项目(GZHKJ00000008)~~

摘　　要：为提高变电站中高压设备局部放电(PD)的3维定位精度,开展了采用定向天线多方位检测的PD定位方法研究。研究了基于2支定向天线旋转检测的PD定位原理,分析了在单点旋转检测定位时的局限性,提出了多方位检测的定位方法。利用特高频信号首波互相关算法进行时延估计,结合网格搜索法和粒子群寻优算法求解非线性方程组实现精准定位。并在220 kV变电站模拟了PD源的定位试验。结果表明:与全向天线定位方法相比,定向天线提升了微弱信号的检测能力,抑制了信号传播多路径效应,多方位检测的定位方法有效提高了变电站内PD的3维定位精度。研究结果对变电站内PD的精准定位具有工程实用价值。In order to obtain a more precise result of the partial discharge （PD） localization in the substation, we proposed a localization method based on directional antennas and multi-direction measurement. Moreover, we studied the principle of the directional antenna used in PD localization, and analyzed its limitation in the practical application. The time differ- ence was calculated by the cross-correlation algol＂ithm based on the wave head of the ultrahigh frequency （UHF） signal. The localization reset was calculated by the stepped-net search method and particle swarm optimization. A localization experiment by a simulated PD source was carried out in a 220 kV substation. The results shows that, compared with om- nidirectional antenna, the detection ability of weak signals is improved by the directional antenna, and the multipath effect is suppressed. The accuracy of the localization result is improved effectively compared with the existing localization method. The research has a practical value for locating the PD source accurately in substation.

关 键 词：局部放电定位 变电站 定向天线 多方位检测 首波互相关算法 

分 类 号：TM63[电气工程—电力系统及自动化] TM855