Pollution Deposition and Pollution Flashover Characteristics of Superhydrophobic Surface in DC Electric Field

Superhydrophobic coatings have gained extensive attention for external insulation because of their self-cleaning properties and high electrical insulation properties. Generally, with the hydrophobicity of external insulation equipment surface improving, the surface pollution deposition can be effectively reduced, so as to improve the anti-pollution flashover performance. Herein, based on a natural pollution accumulation system, we systematically study the macroscopic and microscopic characteristics of the pollution deposition for superhydrophobic surface. Then, the effect of different equivalent salt deposit density on pollution flashover voltage for superhydrophobic surface was studied. With the increase of hydrophobicity, the pollution distribution on the different hydrophobicity surface changes from chain to cluster, which can increase the pollution flashover voltage. The pollution flashover on superhydrophobic surface has competition mechanism, which can lead to the failure of anti-pollution flashover performance in severely pollution environment.