Insulation analyses for vacuum interrupter using multigrid and finite element method

High precision domain discretization and field solution efficiency is the barrier of electric field numerical simulation for multi-dielectrics and complex structure by finite element method (FEM). In this paper, by applying the adaptive control strategy in the transformation between coarse grid and fine grid, an adaptive multigrid-finite element method (AMG-FEM) based on non-structure grid is presented. For simulating the multi-dielectrics and complex electric filed, domain decomposition method (DDM) is employed. And the feasibility and validity of the proposed AMG-FEM/DDM with higher precision and efficiency is verified by calculating the electric field of a vacuum interrupter (VI). And the electric field distributions of the VI with different opening strokes have been figured out dynamically.