The synergistic effect of micro structure/nanofiller/superhydrophobicity on the surface flashover

Abstract

The surface flashover is affected by many factors, such as surface roughness, nanofillers and chemical functional groups. In this research study, polyamide mesh was utilised as a scaffold to systematically study the synergistic effect of micro structure/nanofiller/ superhydrophobicity on the surface flashover. Based on the dissolution and resolidification method, nanofillers were partially embedded into the mesh fabrics. Here, Al 2 O 3 nanoparticles were used as a typical non-conductive nanofiller, and carbon nanotubes were used as a typical conductive nanofiller. Moreover, the micro structure was determined by altering the mesh size, and chemical fluorination was utilised to change the surface chemical group. It was found that the polyamide mesh with 300# demonstrated best anti-flashover properties. Chemical fluorination could effectively improve the flashover voltage. By further adjusting the ratio of Al 2 O 3 to carbon nanotubes, the flashover voltage can be increased by up to 30%.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

The fluorinated SiO2 self‐assembly surface of epoxy resin with excellent insulating and superhydrophobic properties

“…The notation dφ s,f typically represents the differential change in the surface fraction of the fluorine‐containing group. When A ( γ r − γ f ) is positive, the groups with low surface tension tend to migrate spontaneously toward the surface to minimize the energy of the entire system 42 . For the mixed system of ER and F‐SiO 2 , the lower surface tension of the fluorine‐containing groups causes F‐SiO 2 to migrate to the surface.…”

“…When A(γ r À γ f ) is positive, the groups with low surface tension tend to migrate spontaneously toward the surface to minimize the energy of the entire system. 42 For the mixed system of ER and F-SiO 2 , the lower surface tension of the fluorine-containing groups causes F-SiO 2 to migrate to the surface. Subsequently, the self-assembly structure is constructed.…”

Surface charge accumulation of post insulator: Dominant charge transition under different conditions

“…Before each test, the initial surface charge has been cleared by a grounded metal cloth with absolute alcohol [16,25]. The surface potential is randomly distributed on the insulator surface.…”

Design and 3D printing of porous cavity insulation structure for ultra‐high electrical withstanding capability

“…Comparatively, multipactor suppression is the more direct, effective, and frequently used strategy, which is based on the design principle to reduce the secondary electron yield (SEY) of the insulators and reduce the number of electrons available for SEEA. The SEY reduction approaches, including bulk insulation modification (e.g., chemical grafting [24,25], doping of functional fillers [26,27]) and surface treatment (e.g., fluorination [28,29], composite coating [30][31][32][33], plasma treatment [34][35][36], and thin film deposition [37,38]) have shown the ability of multipactor suppression to some extent. Nevertheless, most of these methods are collectively cumbersome and have poor mechanical stability.…”