With the continuous increase of China's power production capacity and the increase of short-circuit capacity, the lack of resistance ability of short-circuit of transformers has become the main cause of transformer accidents. Once an accident occurs, it will lead to blackouts and significant economic losses. In this paper, the three-dimensional finite element model of transformer windings is established, and the typical fault characteristics, winding looseness and deformation settings in the finite element model are modally calculated and analyzed to calculate the changes in the modal parameters of the transformer winding. Then through harmonic analysis, the frequency response curve of the transformer winding winding under normal and typical fault conditions is obtained. These two methods have been verified and supplemented to provide an important basis for subsequent research.
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