Research On Ice-phobic Coating With Hydrophobicity Used For Transmission Aluminum Line

Ice accretion on high voltage overhead transmission line may lead to conductor break, tower collapse and conductor galloping, which bring serious economic loss and severely affect people's life. Therefore, research on the anti-icing and de-icing of transmission aluminum line is important for ensuring the electric system safety. Based on the principle of superhydrophobic surface, some aluminum surfaces with different micro-nanoconstruct and coating were constructed. At the same time, their hydrophobicity and anti-icing properties were studied in the paper.In order to simulate serious glaze on transmission aluminum line, an icing simulation system for transmission line was designed. It was constructed by a low velocity wind tunnel, a nozzle with water droplet diameter of 0.39-0.59mm and a fan with wind velocity of 3m/s. The experimental result shows that transmission aluminum line can be well covered by glaze as naturally icing with the simulation system. In order to measure ice adhesion strength, a test device was designed based on vertical lift method. The icing experimental method and conditon were established in order to simulate natural icing.Based on the Cassie-Baxter principle, superhydrophobic aluminum surfaces with different microstructure were constructed with chemical etching and FAS coating. The ice accretions on different microstructure aluminum surface were tested under low temperature and supercooled water condition in the icing simulation system. The results demonstrate that microstructure is important for ice accretion on aluminum surface and micro-nano holes aluminum surface has excellent ice-phobic property. Because the micro-nano holes aluminum surface has low water slidding angle and ice adhesion strength under low temperature condition, which restrains water droplet adhesion and ice accretion on aluminum surface, it exhibits excellent ice-phobic property.To study the effect of coating on ice accretion, different coatings such as RTV, PTFE, stearic acid, FAS were used to modify the micro-nano holes aluminum surface. From the ice accretion of these aluminum conductor with different coating, it exhibits that the ice accretion on micro-nano structure aluminum is also governed by its surface coating. Only the combination of micro-nano holes structure surface and FAS coating lead to low water slidding angle and ice adhesion strength under low temperature condition, which restrain ice accretion. The RTV, PTFE coated micro-nano holes aluminums have large water slidding angle ang ice adhesion, so they merely prolong the time of forming an intact ice layer.The superhydrophobic aluminum stranded conductor of JL-95 and aluminum conductor steel reinforced of JGL 120/20 were prepared with the same method as the micro-nano holes structure aluminum conductor coated with FAS. The icing results exhibit that the adhesion and freezing of water droplet in the gaps of the alluminum stranded conductor lead to the ice accretion, so the obtained aluminum stranded conductor merely prolong the time of forming an intact ice layer. With constructed double micro-nano structure, the obtained aluminum stranded conductor minimized water droplet in the gaps. So the prepared aluminum stranded conductors have a better ice-phobic property.