Abstract: The presence of metal particles in resin impregnated paper bushings (RIP bushings) significantly affects the operational reliability of the equipment. Particles in the SF₆ cavity cause particle jumping and collision motion, posing a significant threat to the gas insulation of RIP bushings. To clarify the motion characteristics of metal particles, a simulation model for particle motion is established and conducts dynamic simulations of metal particles in the SF₆ cavity of RIP bushings under different initial positions, particle sizes, and materials. The study reveals that under alternating current voltage, metal particles jump in the high electric field area at the bottom of the SF₆ insulation area under the influence of forces such as gas pressure and electric field, exhibiting reciprocating collision motion, with the most intense motion occurring within the first second. Due to the influence of particle mass, aluminum particles achieve a maximum velocity 2.1 times that of copper particles with the same particle size, and the maximum jumping height of aluminum particles is 2.3 times greater than that of copper particles. As the particle size decreases, the maximum jumping height and velocity of copper particles increase by 6.5 times and 7.3 times, respectively, while aluminum particles exhibit irregular and random bouncing motion compared to copper particles. Consequently, smaller metal particle sizes result in higher jumping heights, faster velocities, more complex motion trajectories, and increased likelihood of causing electrical field distortion leading to bushing failures. The conclusions of this study can provide computational basis for the structural optimization and operational maintenance of RIP bushings.