High flashover strength and superhydrophobic coatings by constructing porous surface structure  

作　　者：Mengtao Li Tingxin Chen Xiaobo Guo Lei Dong Jiming Chen Mingxiao Zhu 

机构地区：[1]College of New Energy,China University of Petroleum(East China),Qingdao,China

出　　处：《High Voltage》2023年第4期728-738,共11页高电压（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Number:52007198;Natural Science Foundation of Shandong Province of China,Grant/Award Number:ZR202102240265。

摘　　要：Flashover is prone to occur in composite insulation structures such as vacuum-solid and gas-solid,which are universally employed in high-voltage power equipment.In this study,a high flashover strength and superhydrophobic coating were proposed by constructing porous surface morphology.Octadecyl trichlorosilane(OTS)particles were prepared by hydrolysis condensation reaction,and thereafter sprayed onto the substrate surface to form a porous and rough surface structure with hundreds of nanometres of dispersed pores and pits.The coating endowed epoxy resin with maximum 44%flashover voltage increase and the superhydrophobic surface with water contact angle of 158.4°.Since the pore size in OTS coating is close to electron mean free path in atmospheric condition,the collisional ionisation can be effectively hindered,which suppresses the micro-discharge around the triple junction and improves the flashover strength.The present approach provides a new insight for simultaneously improving flashover strength and superhydrophobic properties of dielectric insulation.

关 键 词：COATING STRENGTH FLASH 

分 类 号：TM752[电气工程—电力系统及自动化]