ABSTRACT To address the real‐time assessment requirements for cumulative deformation and mechanical damage in transformer windings under multiple short‐circuit impacts, this paper proposes a fast method for elastoplastic bending of transformer windings considering the cumulative effect of force transmission. During transformer operation, axial electromagnetic forces in windings achieve dynamic transmission and superposition through the force chain network formed by spacers, reconstructing the electromagnetic force distribution characteristics of transformer windings. To quantify the influence of this effect, this study analyses force transmission mechanisms and quantifies the interlayer transmission coefficient through a combined approach of finite element simulations and pressurisation tests. Subsequently, the image method for rapid electromagnetic force calculation is refined by introducing the interlayer transmission coefficient, thereby improving the accuracy of axial electromagnetic force distribution. Following, a fast computational model for elastoplastic bending is established to analyse the cumulative deformation patterns of windings. The model's accuracy is validated through multiple short‐circuit impact tests. The results demonstrate that the interlayer transmission coefficient stabilises around 0.9, leading to an increase in the peak axial electromagnetic force of each disc winding after correction; the computational results for elastoplastic bending under cumulative effects align well with experimental data, with significantly enhanced computational efficiency.
Wu et al. (Thu,) studied this question.