Detection method of looseness fault vibration of power transformer winding

The invention discloses a detection method of the looseness fault vibration of a power transformer winding, comprising the following steps of: gathering the original vibration signal of the power transformer winding and carrying out normalization processing by taking the large-sized power transformer winding as a monitoring object, and judging a special vibration state, the light looseness, the moderate looseness and serious looseness of the winding by calculating the Fourier frequency spectrum, the peak value, six time scale sampling entropies and a second-order sampling entropy. In the invention, the vibration signal which is sensitive to the change of the mechanical structure of the winding is adopted to make analysis to detect different degrees of looseness of the winding, and particularly, the invention can well detect the light looseness.