Study on the Numerical Simulation of Rime Accretion under DC Electric Field

Abstract

Serious icing of transmission lines threats the safe operation of power system. To reduce the complexity, most conductor icing models ignore the effect of conductor electrification, and theoretical icing is often not in line with the actual situation. In this paper, an icing model under DC electric field is proposed to study the mass and formation of rime under different electric field strength. According to the local collision efficiency (LCE), the icing mass of different elements on the icing surface is obtained, and the ice shape under different surface electric field strength is calculated iteratively. The simulation result shows that with the increase of DC electric field strength, the particles are affected by dielectrophoretic force and electric field force, and the mass of rime icing increases first and then decreases. When the surface electric field is as high as −25kV/cm, the Coulomb repulsion is dominant, the more obvious the repulsion is at the boundary, and the ice shape shrinks and concentrates towards the center.