Study on Discharge Characteristics and Surface Modification of Hydrophobic Atmospheric Pressure Plasma Two-dimensional Jet Array

Improving the surface hydrophobicity of insulating material can effectively curb pollution flashover and moisture flashover in power system, which is of great significance to ensure the stable and reliable operation of power system equipment. Aiming at the surface treatment requirement of large-area insulation materials, single-tube jet was expanded to form a jet array. A two-dimensional honeycomb jet array electrode structure was designed, and trimethysilane (TMS) was added into Ar as the working gas to generate the jet array containing hydrophobic ingredients. The effect of TMS content on the discharge characteristics of the jet array was studied. The electrical properties and optical properties of the jet array with TMS/Ar mixed working gas were diagnosed and the correlated discharge parameters were obtained through calculation. On the basis of the above results, the hydrophobic surface modification of typical insulation material epoxy resin by using the obtained stable jet array was conducted, and the effect of TMS content and treatment time on the modification effect was studied and the modification conditions were optimized. The results show that with the increase of TMS content, the discharging intensity of the array decreases, and the discharge power and transfer charge as well as the related particles all show a decreasing trend. When the content of TMS is 0.04%, the discharge current is 75mA, and the transfer charge and discharge power are 1617nC and 86.75W, respectively. In this condition, the epoxy resin material can be modified to obtain the best effect. After 180s treatment, the water contact angle in the epoxy surface is increased to the maximum of 118° from 42° before the modification.