小波包分析在振动法监测变压器铁芯及绕组状况中的应用.PDF

第 2 1 卷 第 12 期 中　国　电　机 　工 　程 　学 　报 Vol . 2 1 No . 12 Dec . 200 1 200 1 年 12 月 　　　　　　　　 Proceedings of t he CSEE 　　　　　　　　 200 1 Chin . Soc . for Elec . Eng. 文章编号 :025880 13 (200 1) 小波包分析在振动法监测 变压器铁芯及绕组状况中的应用 汲胜昌, 刘味果 , 单 　平 , 李彦明 (西安交通大学 ,陕西 西安 7 10049) THE APPL ICATION OF THE WAVEL ET PACKET TO THE MONITORING OF THE CORE AND WIND ING COND ITION OF TRANSFORMER J I Shengchang , L IU Weiguo , SHAN Ping , L I Yanming (Xi ’an J iaotong U niver sity , Xi ’an 7 10049 , China) ABSTRACT : In t his p ap er , via analyzing t he characteristic of 大的威胁 ,其中绕组及铁芯的故障是重要故障之一 。 WP T , a met hod of gaining t he energy eigenvector of trans 已有的检测 电力变压器绕组故障的方法有 FRA 、 former tank vibration based on t he wavelet p acket is brought L V I 法以及短路电抗法 ,但这些方法均不能在线地 forward ,t he eigenvector can be used for monitoring t he trans 反映变压器的运行状况 。 former core condition . At t he lab ,t he vibration signals oftrans former ’core at noload condition were tested . Comp ared to t he 据文献[ 1 、2 ] 所述 ,在美国、俄罗斯及加拿大等 normal condition ,when t he core has been at defect t here were 国对通过在线监测变压器的器身振动来反映变压器 exiguous changes at t he timedomain ,t hus an affirmatory crite 绕组及铁芯状况的方法进行了一定的研究 。与其它 rion can not been gained to assess t he degree of t he transformer ’ 方法相比,该方法的最大优点是通过贴在变压器器 defect . The vibration signals were analyzed using WP Tarit h 身上的振动传感器来监测变压器绕组及铁芯状况 , metic and t he energy eigenvectors were gained . From t he result of exp eriment ,we can see t his met hod is very useful to estimate 与整个电力系统没有电气连接 ,对系统正常运行无 t he condition of t he transformer ’core . 任何影响 ,能够安全 、可靠地达到在线监测的