Answering this question, I think I still have a bit of experience, because I worked as a high-voltage electrician 20 years ago and erected high-voltage lines, but it was only 10kv. UHV has never done it.


The high-voltage insulators used for erection and connection of high-voltage lines are also called overhangs. The surface is coated with dust-proof coatings, such as silicone root oil 880 #, dimethyl silicone oil or paraffin, which can improve the anti-fouling and water resistance of the insulators. The effect is that raindrops will form water droplets on the surface of the insulator, making it difficult to wet the surface of the insulator (like the water on the lotus leaf).


In addition, the dust-proof coating also has the function of surrounding the fine dust particles, so that the dust particles are aggregated and isolated from the rain, which effectively prevents the occurrence of pollution flashover failure.