Influence Mechanism of Positive DC Electric Field on Rime Ice Accretion on the Insulators and Its Experimental Verification
Insulator icing is a key scientific problem in a complex atmospheric environment,which impairs the safe op-eration of power grid.Compared with the AC,DC electric field exerts adsorption on supercooled water droplets.However,few studies on this issue are available.In this paper,an electric field-flow field coupled simulation,as well as natural icing tests were carried out on two typical suspension insulators based on the principles of field charging,fluid mechanics,and electromagnetics.The results indicate that charged water droplets tend to move along the electric field lines in a DC elec-tric field,and their trajectory deviation increases with increasing applied voltage and droplet diameter,while decreases with an increase of wind speed.Under DC electric field,ice branches form on the surface of the insulators.And there are significant differences in the normal electric field components on different insulator surfaces,which further affect the growth characteristics of ice branches.As the applied voltage increases,ice branches gradually spread from the edge of the shed to its surface.Moreover,the tips of ice branches become increasingly blunt.Ice amount and ice length of two in-sulators under energization are greater than those under non-energization,and the growth rate is more than 15%.The results lay the foundation for establishing a model for ice growth on energized insulator.
positive DC electric fieldinsulator icingcharged water dropletsice branchelectric field-flow field cou-pling
万方数据
维普
