Transformer winding deformation detection method based on oscillatory wave multistage decomposition

The invention discloses a transformer winding deformation detection method based on oscillatory wave multistage decomposition, and the method comprises the steps: firstly obtaining an oscillatory wavecurve through an oscillatory wave experiment device, and selecting an oscillatory wave within 0.1 second of initial oscillation; carrying out seven-stage decomposition on the oscillatory wave curve by utilizing discrete wavelet transform to obtain an original curve and an oscillatory wave curve of each stage of decomposition; calculating a correlation coefficient corr of the smooth approximationcoefficient, and identifying a normal condition and a fault condition; distinguishing an axial displacement fault or a radial deformation fault of the winding through the weighted maximum and minimumindex Wmm; calculating a wave crest and wave trough offset FGDi matrix, and judging the radial deformation severity degree; and calculating a standardized difference coefficient, and judging the axialdisplacement severity. Acco