Fast calculation of electromagnetic-thermal-fulid multiphysics coupling of GIL based on hybrid model

To ensure the reliability and stability of gas-insulated transmission lines(GIL) operation, it is crucial to accurately calculate the temperature distribution. This paper proposes a fast calculation method for GIL electromagnetic- thermal-fluid multiphysics coupling based on hybrid mesh and hybrid dimension (HMHD), including degree of freedom constraints that considering operational and structural characteristics.The proposed method couples a 3D electromagnetic field with a 2D temperature field, maintaining 3D model accuracy while having faster computational speed. Compared with traditional methods, the HMHD has further merits in mesh generation, degree of freedom reduction, and lower computational cost. At same time, it simplifies programming and facilitates the handling of boundary conditions. Both numerical simulations and experimental data demonstrate the feasibility and accuracy of the HMHD method. This study introduces a novel approach for the multiphysics coupling calculation of GIL, with a particular emphasis on its advantages in large-scale computations.