Dynamic Calculation Method for Transformer Short-Circuit Considering Cumulative Effects

Power transformers are critical components in power systems. Insufficient short-circuit withstand capability remains one of the significant causes of transformer failures. Aging equipment commonly experiences deteriorated performance, while quantitative methods for calculating cumulative degradation are lacking. Although dynamic methods have been developed, they suffer from insufficient consideration of material cumulative effects, leading to significant computational errors and limited applicability. Therefore, breakthrough solutions incorporating cumulative effects are urgently needed. This paper proposes a dynamic short-circuit calculation method based on electromagnetic-vibration coupling considering cumulative effects. An inter-disc refinement model incorporating a series-spring model…