Review of interface tailoring techniques and applications to improve insulation performance

Abstract

Interfaces between different materials, for instance, electrode-dielectrics and vacuum/ air/SF 6 -insulators and oilpaper, are universal in high-voltage insulation systems. Targeted tailoring of the interfacial properties, e.g. chemical structures, micro-/nanoscale morphology, the charge injection barrier, trap states, and surface conductivity, is thought to be an effective approach to improve insulation properties such as breakdown and flashover strength, corona/tracking resistance, and wettability. In this article, the authors review recent progress in interface tailoring methods and their application to improve various insulation properties. The potential application scenarios of interface tailoring in different facilities are first summarised, and the desired insulation properties of various applications are highlighted. Interface tailoring methods are classified as physical/ chemical surface modification and surface coating (inorganic, organic and composite), and the features of different techniques are described in detail. The structure-property relationships between interfacial states and various microscopic parameters such as charge injection barrier, trap distribution and surface conductivity are discussed together with the tailoring mechanisms for different insulation properties. Finally, the future development prospects of interface tailoring methods and their applications, e.g. multifunctional coating and stimuli-response smart coating, are presented.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

Nano-TiO2/MWCNT composite coating with high DC flashover strength and super hydrophobicity

“…In addition, due to the doping of nano-TiO 2 particles and MWCNT in the coating, the surface microstructure of the coating changed during the spraying process, and the surface presented nanoporous morphology. According to previous studies, the surface trap distribution and surface topography are the main factors that determine the insulating properties of materials [6]. However, with the enhancement of nano-filler content, the high-density nanoparticles are distributed in the porous structure.…”

Research on a prediction model for gas insulation performance based on Pareto optimisation

“…The molecular structure of the gas is similar to each other, the higher the molecular mass is, the higher the boiling point. The relative molecular masses are also similar; the stronger the molecular polarity is (the higher the polarisability), the stronger the electrostatic interaction between the molecules, which leads to increase in the van der Waals force between the molecules and BT [23][24][25][26][27][28].…”

Research of cycloaliphatic epoxy resin and silicone rubber composite insulator interface based on four‐electrode system and temperature rise model

“…As a common failure of composite insulators, decay-like fracture can lead to the trip of transmission line and destroy power system stability [5][6][7][8]. It is considered to be related to the interface state [9][10][11][12]. The weak adhesion and liquid in the interface are the direct factors for the internal discharge and core ageing.…”

“…Thus, the interface performance is an important evaluation index for composite insulators. At the same time, composite insulators are often accompanied by abnormal temperature rise before decay-like fracture [10]. Temperature monitoring is also a common evaluation method for composite insulators.…”