空载合闸冲击条件下变压器绕组轻微松动预警  

Warning of Transformer Winding Slight Looseness Under No-load Switching on Shock Conditions

作　　者：尹来宾 李勇 朱雷 何萍 许洪华 颜锦 YIN Lai-bin;LI Yong;ZHU Lei;HE Ping;XU Hong-hua;YAN Jin(State Grid Jiangsu Electric Power Co.,Ltd.Nanjing Power Supply Branch,Nanjing 210019,China;School of Energy and Electrical Science,Hohai University,Nanjing 211100,China)

机构地区：[1]国网江苏省电力有限公司南京供电分公司,江苏南京210019 [2]河海大学能源与电气学院,江苏南京211100

出　　处：《变压器》2022年第8期37-42,共6页Transformer

基　　金：国网江苏省电力公司重点科技项目(J2020042)。

摘　　要：本文针对变压器在空载合闸冲击时产生的振动信号,提出了一种基于空载合闸冲击条件下变压器绕组轻微松动预警方法。首先,采用小波变换将变压器空载合闸振动信号转换成时频谱图,然后再提取时频图像的纹理特征和形状特征作为特征向量并输入到支持向量机进行分类识别。试验结果表明,所提方法能准确识别变压器轻微松动故障。Aiming at the vibration signal generated by transformer during no-load closing state, an early warning method for transformer winding slight looseness under no-load switching on shock conditions. Firstly, the vibration signal is converted into time-frequency image by using wavelet transform(WT). Then, the texture features and shape features of the time-frequency image are extracted as feature vectors and input to the support vector machine for classification and recognition. The experimental results show that the proposed method can accurately identify the slight looseness fault of the transformer.

关 键 词：变压器 空载合闸 绕组松动 时频分析 小波变换 

分 类 号：TM406[电气工程—电器]