Study on the Motion Pattern of a Spherical Metal Particle in DC GIL

To solve the problem of metal particle contamination in DC gas insulated metal-enclosed transmission line (DC GIL), by linking COMSOL and MATLAB, a spherical metal particle motion model in DC GIL is established considering the interaction between particle motion and electric field distribution. The variations of forces acting on the particle and velocity of the particle are studied, the effect of particle diameter on the particle motion is analyzed. The results indicate that with the increase of particle diameter, the radial acceleration decreases which results in the increase of particle-GIL shell collision cycle. Besides, the dispersion degree of particle motion distribution experiences an initial increase and then followed by a decreasing tendency, the maximum dispersion degree appears at the particle diameter of 1.4 mm. The accuracy of the proposed model is verified by the experimental observation via high-speed camera.