Research on the Influence of Uneven Temperature Distribution of Transformer Windings on Short Circuit Strength

Whether the hot spot temperature rise exceeds the limit under long-term thermal effects and the impact of temperature rise effect on material parameters has attracted much attention. At the same time, as a key structural component of the transmission and transformation system, the calculation and verification of the winding mechanical strength of transformers during three-phase short circuits is a key factor in analyzing their stability during operation. Given that the previous analysis of the impact of transformer short-circuit strength only considered uniform temperature conditions, it is necessary to compare and analyze the impact of uneven temperature on winding stability. This article focuses on the SGB10-800 transformer prototype, conducting temperature rise experiments and simulation analysis to verify the accuracy of simulation processing. Conduct tests on the changes in force and deformation of wires under different temperature conditions. Finally, analysis of the impact of uneven temperature on the short-circuit strength of transformer windings.