结合载纤绕组形变测量法的大型变压器绕组多次短路冲击暂态声纹特征  

Transient Acoustics Characteristics of Large Transformer Windings Under Multiple Short-circuit Impulse Combined With Fiber-carrying Winding Deformation Measurement

作　　者：刘云鹏[1] 王博闻[1] 李欢[1] 高树国 田源 范晓舟[1] 周旭东 LIU Yunpeng;WANG Bowen;LI Huan;GAO Shuguo;TIAN Yuan;FAN Xiaozhou;ZHOU Xudong(Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense(North China Electric Power University),Baoding 071003,Hebei Province,China;State Grid Hebei Electric Power Research Institute,Shijiazhuang 050021,Hebei Province,China)

机构地区：[1]河北省输变电设备安全防御重点实验室(华北电力大学),河北省保定市071003 [2]国网河北省电力有限公司电力科学研究院,河北省石家庄市050021

出　　处：《中国电机工程学报》2022年第1期434-446,共13页Proceedings of the CSEE

基　　金：河北省重点研发计划项目(19212110D)。

摘　　要：电力变压器遭受短路冲击的暂态声音信号包含变压器绕组状态信息。为探究短路冲击声信号与变压器绕组形变之间的关系,该文首先对载纤改造后的110kV变压器开展多次短路冲击试验,并采集短路瞬间声纹。然后,构建占比时频谱熵与频谱成分欧氏距离2种短路冲击暂态声纹特征,用于表征绕组变形情况。最后,提出基于占比时频谱熵与频谱成分欧氏距离2种声纹特征的联合判定流程,并利用光纤应变量与短路电抗值验证该方法的有效性。结果表明,该方法能够对抗短路能力出现明显下降瞬间的声信号进行大致判别,在绕组状态的初期诊断工作中具有一定的价值。The transient acoustic signal of power transformer subjected to short circuit impact contains the state information of transformer winding.In order to explore the relationship between short circuit impulse sound signal and transformer winding deformation,firstly,several short circuit impulse tests were carried out on 110 kV transformer with optical fiber,and the short-circuit instantaneous voiceprint was collected in this paper.Then,the proportion time-frequency spectrum entropy and the spectrum component Euclidean distance,and two short-circuit impulse transient voiceprint characteristics were constructed to characterize the winding deformation.Finally,the joint decision process based on the proportion time-frequency spectrum entropy and the spectral component Euclidean distance was proposed.The effectiveness of this method was verified by using optical fiber strain and short-circuit reactance.The results show that the method can roughly distinguish the sound signal at the moment when the short-circuit ability decreases obviously,and it has a certain value in the initial diagnosis of the winding state.

关 键 词：变压器声纹 分布式光纤 布里渊光时域反射 短路试验 

分 类 号：TM47[电气工程—电器]