Laboratory detection technology of transformer winding deformation based on frequency response curve difference

The winding deformation is one of the common defects of power transformers. Frequency response analysis (FRA) can be used to detect the change of the internal geometry of transformers. In this paper, the frequency response curve of the internal winding is compared with the reference response characteristic curve, and the deformation detection of the internal winding of the power transformer is realized based on the difference analysis. The feasibility of detecting axial displacement and radial deformation between windings with different connection modes is proved by simulation and simulation.