基于瞬时能量特征排列熵的局部放电位置辨识  

Partial Discharge Location Identification Based on Permutation Entropy of Instantaneous Energy Features

作　　者：王喆 杨聪 沈润夏 李淑倩 屈炳建 WANG Zhe;YANG Cong;SHEN Runxia;LI Shuqian;QU Bingjian(State Grid Sichuan Electric Power Company Liangshan Power Supply Company,Liangshan 615000,China)

机构地区：[1]国网四川省电力公司凉山供电公司,四川凉山615000

出　　处：《微型电脑应用》2025年第2期234-239,共6页Microcomputer Applications

摘　　要：局部放电(PD)定位是一种能早期预测变压器绕组即将发生的可靠和必要的技术。不同的PD源会受到绝缘的影响,在不同位置测量的PD表现出独特的能量特征。提出一种基于能量特征的绕组内部PD定位方法,为了揭示PD信号的多尺度本征特征,使用集成经验模式分解(EEMD)提取本征模函数(IMF),计算排列在前几个IMF的瞬时能量分布值以捕获PD能量,采用快速主成分(F-PCA)进行特征降维,提出一种基于自适应密度的空间聚类-最近邻图(ADBSCAN-NNG)算法识别局部高密度能量分量,并采用高频电流传感器(HFCT)对真空铸造的变压器绕组验证所提算法的可行性。定位结果表明,算法能够实现对变压器绕组PD信号的定位,且算法的复杂度大大降低,有效提高定位的精度和速度,具有一定的工程实践指导意义。Partial discharge(PD)positioning is a reliable and necessary technique that can predict the upcoming occurrence of transformer windings early.PD sources are affected by insulation,and PD measured at different locations exhibits different energy characteristics.In this paper,a method for locating PD inside windings based on energy characteristics is proposed.In order to reveal the multi-scale eigen characteristics of the PD signal,the intrinsic mode function(IMF)is extracted using integrated ensemble empirical mode decomposition(EEMD).The instantaneous energy distribution values of the first few IMF are calculated to capture PD energy,and a fast principal component analysis(F-PCA)based on a fixed-point algorithm is used for characteristic dimensionality reduction.An adaptive density based spatial clustering of applications with nearest neighbor graph(ADBSCAN-NNG)algorithm is proposed to identify local high-density energy components,and use a high-frequency current sensor(HFCT)to verify the feasibility of the proposed algorithm on the vacuum-cast transformer winding.After verification,the positioning results show that the algorithm can realize the positioning of the PD signal of the transformer winding,and the complexity of the algorithm is greatly reduced,which effectively improves the positioning accuracy and speed,and has certain engineering practice guiding significance.

关 键 词：变压器 局部放电 瞬时能量特征 排列熵 最近邻图算法 

分 类 号：TM85[电气工程—高电压与绝缘技术]