Multiscale Dynamic Simulation Study on the Adsorption of Micrometer-Sized Metal Particles on Insulator Surfaces for HVDC GIL

Free metal particles within HVdc gas-insulated transmission line (GIL) pose a significant threat to insulation integrity. This article presents a multiscale dynamic simulation method for micrometer-sized metal particles in HVdc GIL systems. It establishes an adhesion simulation model for these metal particles and captures their macroscopic movement in conjunction with microscopic properties. Based on this model, the collision characteristics of particles of algorithms, sizes, and shapes are analyzed. The simulation results indicate that the critical adsorption velocity of ellipsoidal particles with an eccentricity of 5 is six times greater than that of particles of the same size. The belly of the tri-post insulator is identified as a high-risk area for the adsorption of metal particles. While increasing the particle trap length enhances capture efficiency, a saturation phenomenon occurs, which varies with the electric field of the GIL insulator. Following simulation analysis, the optimal trap length is determined to be 550 mm. These studies provide methodologies for the accurate simulation of metal particles and contribute to particle pollution control and the reliability enhancement of HVdc GIL equipment.