Influence of nano boron nitride (BN) on electric corrosion of fluororesin based super hydrophobic coatings for insulators

Ice accumulation on transmission lines, caused by freezing rain, wet snow or frost, is one of major problems influencing safety of electric power system. Super hydrophobic coating on insulators is a kind of efficient way to solve the problem. Many kinds of super hydrophobic coatings are widely used in power system, especially fluororesin based coating which is cheap and has good outdoor weathering capabilities. However, after arc burning, fluororesin based super-hydrophobic coating would be destroyed due to partial temperature rising. Addition of high thermal conductive nanoparticles can increase thermal conductivity of coating and improve its arc resistant ability compared with undoped coating. In this paper, heat conductivity behaviors of super hydrophobic with BN particles is studied. The charge polarity, charging time and charging voltage also play an important role on arc electric erosion behaviors. Samples were prepared by dispersing BN nanoparticle into coating. DC arc test was performed using inclined plane test method.