Effect of electron irradiation on DC surface flashover of polyimide in vacuum

Li, Guochang; Li, Shengtao; Pan, Shaoming; Min, Daomin

doi:10.1109/tdei.2016.005429

Cited by 25 publications

(10 citation statements)

References 27 publications

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“…Gao et al stated that electron beam irradiation induced crosslinking reactions within the samples, and the improved crosslinking structure gave rise to enhanced PD resistance [44]. The influence of electron beam irradiation on the surface flashover of an epoxy resin/Al 2 O 3 composite was investigated by Li et al, and they found that deep trap density and energy levels increase with the electron beam energy [58][59][60]. As a result, the introduced deep traps enhanced the ability to capture primary emitted electrons, thus suppressing the secondary electron emission process.…”

Section: Chemical Modification Methodsmentioning

confidence: 99%

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: Chemical Modification Methodsmentioning

confidence: 99%

Review of interface tailoring techniques and applications to improve insulation performance

et al. 2021

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“…It was reported that after electron irradiation, the dc surface flashover of PI was increased due to the electron stored below the surface [46]. Due to the presence of electron in the bulk, the electric field at the triple junction is lowered and then the flashover initiation prevented unless the dc voltage is increased.…”

Section: Effect Of Electron Irradiationmentioning

confidence: 99%

Polyimide Used in Space Applications

Griseri¹

2021

Polyimide for Electronic and Electrical Engineering Applications

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Polyimide (PI) is an interesting material for space applications as it offers excellent thermal properties. However, due to its dielectric properties, charge storage and release can be at the origin of electrostatic discharges that are hazardous for the surrounding electrical equipment. Depending on the spacecraft orbit, it is necessary to study the impact of specific surrounding environment. In any cases, the effect of vacuum and temperature variations can be combined with electrons and protons' irradiation, atomic oxygen erosion, and photons impact from UV exposure. On the market, there exist many types of PI, and since several years, composite are also developed. The main properties that are usually observed are the conductivity that is analyzed from surface potential decay, the photoemission and the ability to initiate and propagate surface flashover. Since several years, the space charge storage analysis by the pulse electro-acoustic method has been developed as an interesting complementary tool. It is important to remember that experimental characterization needs to be representative to the space environment especially because it has been observed that PI can recover its original properties in air in a couple of hours depending on the ageing degree.

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“…Authors have made a series of studies on the improvement of surface flashover in vacuum of insulating material modified by electron beam irradiation [115][116][117][118]. Fig.…”

Section: Surface Modificationmentioning

confidence: 99%

“…Fig. 10 exhibits the surface flashover performance in vacuum of PI film after irradiated by different energies [116, 117]. These results point surface flashover voltages and irradiation energy show a positive correlation.…”

Section: Materials Modificationmentioning

confidence: 99%

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Improvement of surface flashover in vacuum

2020

High Voltage

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Surface flashover of insulation systems is a basic issue in the field of high voltage and electrical insulation. To improve the surface flashover performance is of great significance for the development of advanced power transmission equipment and insulation materials. This study reviews the research progress of surface flashover in vacuum regarding to effective methods to improve the surface flashover performance in vacuum, including insulation system optimisation and material modification. The former one is beneficial to reduce the electric field distortion, and the later one is able to adjust the surface trap parameters of the material through physical and chemical methods. In addition, the 'U-shaped' curve is proposed to reveal the relationship between surface flashover voltage and surface trap level, discovering the synthetic effects of surface traps on surface flashover. It is expected that the 'U-shaped' curve will become a guidance to improve surface flashover performance through adjusting trap parameters. Moreover, several suggestions are made to build unified surface flashover model which is suitable to the range from high vacuum to high pressure.

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Effect of electron irradiation on DC surface flashover of polyimide in vacuum

Cited by 25 publications

References 27 publications

Review of interface tailoring techniques and applications to improve insulation performance

Review of interface tailoring techniques and applications to improve insulation performance

Polyimide Used in Space Applications

Improvement of surface flashover in vacuum

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