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The icing flashover is increasingly becoming a serious problem with the development of the extra-high voltage engineering. Reducing the bonding strength between the substrate and the ice by super-hydrophobic coating is a choice for the anti-icing. The bare insulator, RTV coated insulator and the super-hydrophobic insulator are chosen for comparing. The experimental facility is set up. The vertical bonding strength, the vertical fracture energy, the shear bonding strength and the shear fracture energy are detected after first ice glaciations and second one. Results show that bonding strength between the super-hydrophobic substrate and the ice is less than that of the RTV coated insulator and the ice. The deiced surface still shows good super-hydrophobicity and the small ice bonding strength keeps almost the same which show good prospect for the anti-icing and de-icing.

Ice accretion on high voltage overhead transmission lines is a serious problem for power system and there's no satisfactory solution to solve icing problem at present. Ordinary glass insulators can obtain super-hydrophobic and self-cleaning properties by coating super-hydrophobic coating on surfaces. The current research shows that super-hydrophobic coating has potential to fix icing problem, because of its excellent hydrophobicity. In this paper, key point is focused on de-iced super-hydrophobic coating's hydrophobicity and surface micro-structure for verifying super-hydrophobic coating's long-term efficacy. Related experiments were completed, and room temperature vulcanized silicone rubber (RTV) coating and blank sample were used as reference samples. The experiments' results showed that de-iced super-hydrophobic coating's static contact angle still reached 158° and its surface still maintained its binary micro-nano coarse structure, and there were no signs of damage on its surface. These phenomena indicate that super-hydrophobic coating's surface micro-structure has outstanding mechanical strength, which can resist the negative impact of de-icing process and keep its outstanding hydrophobicity. Therefore, super-hydrophobic coating has long-term stability under freeze-thaw cycles.