A Study on Leakage Flux and Temperature of Power Transformers Based on Magnetic-Thermal Coupling

With the rapid development of the power industry, transformers, as key equipment, face increasing demands for performance and reliability. Leakage flux and temperature rise are core factors affecting transformer performance and lifespan. Leakage flux can increase transformer losses and cause local overheating, while excessive temperature rise can accelerate insulation aging, reducing transformer efficiency and reliability. This paper uses magnetic-thermal coupling analysis to explore the leakage flux distribution and temperature rise characteristics of three-phase transformers. Through finite element simulation, it reveals the interaction between leakage flux and temperature rise, leading to key conclusions. The magnetic shielding reduces the tank surface flux density by 66.4%. The findings provide a theoretical basis for transformer design and optimization, helping enhance performance and reliability, extend service life, and offering significant references for efficient operation and maintenance.