Research on Magnetic Field Characteristics of Transformer Under Typical Ab-normal Conditions
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 mi-cro-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 varia-tion 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 opti-mal placement position and sensitivity level are obtained,which provides a basis for the application of micro magnet-ic field sensor in transformer fault detection.
micro magnetic field sensorCOMSOLsingle-phase E-core transformersymmetrywavelet transformsensitivity
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