In order to further investigate the vibration performance of power transformer for the detection of winding deformation based on the vibration frequency response analysis (VFRA) method, the electro dynamic forces of the winding of power transformer are calculated first by virtue of the fieldcircuit coupled finite element method. Then the axial vibration model of the winding is built and the harmonic response analysis is done to study the vibration performance with the obtained results of electro dynamic forces when the winding is in healthy condition and in fault condition. The experiment of vibration frequency response for the 220kV transformer is made via the developed vibration measurement system. Calculated results and experimental results are agreed well when the winding is deformed with the preset fault of the drop of winding block. Moreover, it is verified again by the experimental results that the vibration analysis method to detect the winding deformation is more sensitive than that of leakage reactance method.Index Terms-Power transformer, winding deformation, electro dynamic force, finite element method
The method of monitoring the tank vibration is becoming an effective method to detect the winding deformation of power transformer for the reliable and secure operation of power system. In order to further identify the relationship between the winding deformation fault of power transformer and the measured tank vibration signals, the short-circuit test is done in a 220kV transformer with the developed vibration measurement system and the vibration frequency response curves for some pre-setting winding deformation faults are obtained. Multi-fractal spectrum is applied to analyze the of the obtained vibration signals when winding conditions of power transformer are changed. It is shown that multi-fractal spectrum can effectively indicate the geometric structure features of vibration signals. The parameter variations of multi-fractal spectrum are agreed well with the preset winding faults, which provides another method for the feature extraction of vibration signal to detect the winding deformation of power transformer.
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