变压器典型异常工况下磁场特征研究  

Research on Magnetic Field Characteristics of Transformer Under Typical Abnormal Conditions

作　　者：石迅 杨耿煌[1,2] 孙京生[3] 耿丽清[1,2] SHI Xun;YANG Genghuang;SUN Jingsheng;GENG Liqing(School of Automation and Electrical Engineering,Tianjin University of Technology and Education,Tianjin 300222,China;Tianjin Key Laboratory of Information Sensing and Intelligent Control,Tianjin University of Technology and Education,Tianjin 300222,China;State Grid Tianjin Electric Power Company Integrated Service Center,Tianjin 300143,China)

机构地区：[1]天津职业技术师范大学自动化与电气工程学院,天津300222 [2]天津职业技术师范大学天津市信息传感与智能控制重点实验室,天津300222 [3]国网天津市电力公司综合服务中心,天津300143

出　　处：《自动化与仪表》2024年第8期1-5,14,共6页Automation & Instrumentation

摘　　要：针对微型磁场传感器在变压器故障检测中不同放置位置检测精度差异大的问题,该文以单相E磁芯变压器为例,基于COMSOL有限元仿真建立模型探究微型传感器在变压器中最佳放置位置。首先分析并阐明变压器磁场对称性分布规律;然后设置诸如匝间短路、负载变化和频率变化等多种典型异常工况,采用小波变换分析上述工况下变压器不同位置磁场强度、相位变化情况;最后基于信号突变规律、突变时间得到最佳放置位置并判断灵敏度级别,为微型磁场传感器在变压器故障检测中的应用提供依据。In this paper,to solve the problem of large difference in detection accuracy of micro magnetic field sensors at different positions in transformer fault detection.The single-phase E-core transformer is taken as an example,based on COMSOL finite element simulation,a model was established to explore the optimal placement position of the micro-sensor in the transformer.Firstly,the symmetrical distribution law of transformer magnetic field is analyzed and clarified.Then,several typical abnormal conditions such as inter-turn short circuit,load variation and frequency variation are set up,and the magnetic field intensity and phase variation at different positions of the transformer under the above conditions are analyzed by wavelet transform.Finally,based on the signal variation law and time,the optimal placement position and sensitivity level are obtained,which provides a basis for the application of micro magnetic field sensor in transformer fault detection.

关 键 词：微型磁场传感器 COMSOL 单相E磁芯变压器 对称性 小波变换 灵敏度 

分 类 号：TP206.3[自动化与计算机技术—检测技术与自动化装置]