550kV GIL Three-pillar Structure Press-fitting Process Simulation

This paper establishes a two-dimensional axisymmetric model of the 550kV GIL Three-pillar insulator and shield tube press-fit structure. Explicit calculation methods were used to simulate the press-fitting process of Three-pillar insulator, such as pressing the wedge ring with a force of 4t and closing the shield tube with a force of 3.5t. The influences of different friction coefficients and different solution time steps on the displacement of the wedge ring, the axial displacement of the closing mould and the distance between the end of the shield tube and the center conductor after closing are compared and analyzed. After increasing the simulation time step of the closing, the changes of the parameters such as the axial displacement of the mould, the closing gap, Mises stress and equivalent plastic strain are compared and analyzed. The comparison results show that the friction coefficient has a significant effect on the wedge ring's indentation parameters; different solution time steps and increased closing simulation time steps have little effect on the wedge ring's indentation and shielding tube closing result parameters. The test shows that when the friction coefficient is 0.11, the simulation results are basically consistent with the test results. This simulation method can provide guidance for the optimization design of press-fitting process parameters and the subsequent press-fitting simulation of similar products.