Fluorinated epoxy insulator with interfacial conductivity graded material for HVDC gaseous insulated pipeline

Du, B. X.; Ran, Z. Y.; Liang, Hucheng; Yao, Hang

doi:10.1109/tdei.2020.008761

Cited by 31 publications

(15 citation statements)

References 22 publications

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“…To maximise the electric field homogenisation effect of the ε-SFGM insulator, the spatially dependent thickness of the BaTiO 3 sputtering layer was optimised by an iterative method. During the sputtering process, the sputtering time and layer thickness distributions, namely the permittivity Copyright 2019, IOP Publishing of the BaTiO 3 layer, were controlled by a rotating mask with a designed gap above the insulator [9,29,30], as shown in Figure 12. The maximum electric field of the optimal ε-SFGM insulator was reduced by ∼70%, and the AC flashover voltage was improved by ∼20% in air.…”

Section: Surface Conductivity and Permittivity Of Surface Layermentioning

confidence: 99%

“…Surface modification techniques including fluorination [14,15], plasma treatment [21][22][23][24] and surface coating [25,26] were employed to regulate surface conductivity and trap distributions, thereby suppressing surface charge accumulation and improving flashover performance. Surface functionally graded materials (SFGMs) with spatially graded distributions of permittivity/conductivity at the gasspacer interface were fabricated by dip coating [27], magnetron sputtering [28,29] and gradient fluorination [30] methods and showed promising application in suppressing electric field distortions and elevating flashover voltages. Apart from improving electrical properties, numerous techniques such as lithography, etching, templating, chemical vapour deposition (CVD) and surface coating methods have been presented to build superhydrophobic surfaces by altering surface microscale/nanoscale structures or surface free energy and have a range of applications in waterproofing, self-cleaning, anti-icing and anticorrosion [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Review of interface tailoring techniques and applications to improve insulation performance

et al. 2021

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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.

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Section: Surface Conductivity and Permittivity Of Surface Layermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Review of interface tailoring techniques and applications to improve insulation performance

et al. 2021

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“…20 the thickness of the fluorination layer and the surface conductivity of epoxy increase with the fluorination time and the fluorination temperature. The gradient fluorination method was thus proposed by the authors' team to fabricate σ ‐SFGM insulators with a continuous surface conductivity gradient [51, 52]. During fluorination, a heater was placed on the insulator top to form a continuous temperature gradient, controlling the distribution of fluorination rate and regulating the thickness distribution of the fluorination layer, as shown in Fig.…”

Section: Surface Fgm (Sfgm) Insulator For Compact Gis/gilmentioning

confidence: 99%

“… Fabrication, design and evaluation of graded fluorinated spacer ( a ) Diagram of the gradient fluorination method, ( b ) Surface conductivity distributions of SFGM insulators, ( c ) E‐field distributions [52]…”

Section: Surface Fgm (Sfgm) Insulator For Compact Gis/gilmentioning

confidence: 99%

Promising functional graded materials for compact gaseous insulated switchgears/pipelines

Liang

Chen

2020

High Voltage

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The electric field distributions along gas-solid interfaces determine the reliability, lifetimes and sizes of gaseous insulated switchgears/pipelines (GIS/GIL), which also affect the reliability of power systems. In this study, the characteristics of steady and transient electric field distributions were first introduced, followed by the concept of functionally graded materials (FGMs). The development histories of FGM applied in electrical engineering and the related optimisation methods were described in detail. The field regulation effect and fabrication technology of different FGM insulators were also compared. To overcome the limitations of traditional FGM insulators, the design of surface FGM (SFGM) was proposed, together with their preparation methods and electrical performance. Furthermore, the future development prospects of FGM and SFGM insulators for compact GIS/GIL were summarised.

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“…Nanomaterials have some unique properties, such as small size effect, quantum effect, and surface effect, which have been gradually used in dielectric modification [ 4 , 5 , 6 , 7 ]. Researches have shown that the doping of nanoparticles can combine the excellent properties of the filler itself, such as high toughness and thermal conductivity, with epoxy resin to enhance the thermal, dielectric, and mechanical properties of epoxy composites [ 8 , 9 , 10 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Terminal Groups on Thermomechanical and Dielectric Properties of Silica–Epoxy Composite Modified by Hyperbranched Polyester

Zhang

Wang

et al. 2021

Polymers

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To study the effect of hyperbranched polyester with different kinds of terminal groups on the thermomechanical and dielectric properties of silica–epoxy resin composite, a molecular dynamics simulation method was utilized. Pure epoxy resin and four groups of silica–epoxy resin composites were established, where the silica surface was hydrogenated, grafted with silane coupling agents, and grafted with hyperbranched polyester with terminal carboxyl and terminal hydroxyl, respectively. Then the thermal conductivity, glass transition temperature, elastic modulus, dielectric constant, free volume fraction, mean square displacement, hydrogen bonds, and binding energy of the five models were calculated. The results showed that the hyperbranched polyester significantly improved the thermomechanical and dielectric properties of the silica–epoxy composites compared with other surface treatments, and the terminal groups had an obvious effect on the enhancement effect. Among them, epoxy composite modified by the hyperbranched polyester with terminal carboxy exhibited the best thermomechanical properties and lowest dielectric constant. Our analysis of the microstructure found that the two systems grafted with hyperbranched polyester had a smaller free volume fraction (FFV) and mean square displacement (MSD), and the larger number of hydrogen bonds and greater binding energy, indicating that weaker strength of molecular segments motion and stronger interfacial bonding between silica and epoxy resin matrix were the reasons for the enhancement of the thermomechanical and dielectric properties.

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Fluorinated epoxy insulator with interfacial conductivity graded material for HVDC gaseous insulated pipeline

Cited by 31 publications

References 22 publications

Review of interface tailoring techniques and applications to improve insulation performance

Review of interface tailoring techniques and applications to improve insulation performance

Promising functional graded materials for compact gaseous insulated switchgears/pipelines

Effect of Terminal Groups on Thermomechanical and Dielectric Properties of Silica–Epoxy Composite Modified by Hyperbranched Polyester

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