Experimental research of vibration sweep frequency response analysis to detect the winding deformation of power transformer

In order to further recognize the relationship between the fault of winding deformation of power transformer with the measured tank vibration, the short-circuit test is done in a 220kV transformer. The vibration sweep frequency response curves for some pre-setting winding deformation fault are obtained by virtue of the vibration measurement system. Correlation coefficient is defined and calculated for the whole frequency segment and low frequency segment and high frequency segment separately to evaluate the degree of winding deformation quantitatively. Meanwhile, the amplitude response curves required by the frequency response analysis are also plotted and correlation coefficients are calculated. It is showed that the vibration sweep frequency response analysis is more sensitive to the slightly winding deformation than that of frequency response analysis. Moreover, the defined correlation coefficient for a certain frequency segment has a certain relation to the different fault type of winding deformation.