Gas-insulated transmission lines (GIL)

as critical equipment in high-voltage power grids

exhibit electromagnetic response anomalies during operation that directly impact the safety and stability of power systems. To address the limitations of traditional full 3D electromagnetic analysis methods

such as low computational efficiency and insufficient accuracy of empirical formulas

this study innovatively proposes a 2D-3D multi-physics coupled electromagnetic response conduction calculation method. Taking a 220 kV three-phase-enclosed GIL as the research object

we systematically analyze the electromagnetic field distribution characteristics and the evolution of electromagnetic forces at conductor nodes under different operating conditions. Furthermore

by coupling finite element structural field analysis with transient dynamics

this work reveals for the first time the dynamic electromagnetic stress distribution mechanism in key GIL components. The research findings are validated through finite element numerical experiments and on-site measurements

demonstrating that the proposed method achieves high computational accuracy and engineering applicability. This study provides important theoretical foundations and technical supports for the optimized design and safety assessment of GIL.