Abstract: Winding wires are crucial components of structural supports along the axial direction of the coils in power transformers. However, the cumulative effects of multiple short-circuit impacts on transformer winding wires remain unclear. This paper proposes a multiple short-circuit impact equivalent test method applicable to winding wires. A dynamic impact test platform is constructed to overcome the limitations of static loads in material tests. The experiment reveals the patterns of cumulative deformations of winding wires. The results indicate that the cumulative deformation increases and saturates with the increasing number of short -circuits. The type of short-circuit interval influences short-circuit cumulative properties of winding wires. A calculation method for transformer coil impedance changes based on deformations of winding wires is proposed. Example calculations demonstrate that the impedance of each coil changes after multiple short-circuits, with a maximum impedance change of 1.21%, leading to a potential risk of fault. The research elucidates the cumulative effect properties of multiple short-circuits on winding wires, providing technical support for further studying the influence of multiple short-circuit cumulative effects on transformer short-circuit withstand capability and dynamic response calculations of transformer coils.