Trap distribution of polymeric materials and its effect on surface flashover in vacuum

Ren, Chengyan; Zhang, Chuansheng; Hu, Duo; Kong, Fei; Shao, Tao; Yan, Ping

doi:10.1088/2058-6272/ab580d

Cited by 21 publications

(13 citation statements)

References 31 publications

(38 reference statements)

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“…In addition, the accumulated charges at the solid−liquid interface could distort the surface electric field and accelerate the surface flashover process. Under the joint action of trap charge, surface charge, and electrode injection charge, 41 the final flashover occurs at the solid−liquid interface.…”

Section: Experimental Results Analysis and Discussionmentioning

confidence: 99%

Liquefied Natural Gas for Superconducting Energy Pipelines: A Feasibility Study on Electrical Insulation

et al. 2021

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A superconducting energy pipeline is an integrated system for fuel delivery and power transmission. In the energy pipeline, direct current (DC) power is carried by superconducting tapes with almost no loss. Moreover, liquefied natural gas (LNG) is used not only as one kind of clean energy but also as a cooling medium. However, the lack of data on the electrical insulation characteristics of LNG (especially the resistance to breakdown and flashover) restricts the development of a superconducting energy pipeline. Therefore, this paper focuses on solving a series of problems (such as gas tightness, overpressure, and high voltage) in LNG insulation testing, obtaining the electrical failure data of multicomponent LNG, and analyzing the behavior of electric breakdown and flashover in LNG. The test results show that LNG as a dielectric cooling medium has remarkable performance in withstand voltage to replace the liquid nitrogen/liquid tetrafluoromethane (LN2/LCF4) binary mixtures. The research could offer key technical support for the superconducting energy pipeline and also provide a reference for the study of electrical properties on other cryogenic fuels.

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Section: Experimental Results Analysis and Discussionmentioning

confidence: 99%

Liquefied Natural Gas for Superconducting Energy Pipelines: A Feasibility Study on Electrical Insulation

et al. 2021

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“…Some of these results show that the trap levels became shallower after insulator modification, and have a negative correlation with the surface flashover voltage [82, 87, 93–96, 106]. In other results, however, the trap levels become deeper after insulator modification and have a positive correlation with the surface flashover voltage [117, 119, 120, 122, 130, 135, 136, 138, 139, 141, 144, 149]. These studies suggest that there seems to be a controversy about the effect of trap parameters on surface flashover performance.…”

Section: Discussionmentioning

confidence: 99%

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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“…The above process continuously increases the number of electrons in the desorbed gas layer to form secondary electron collapse, which eventually results in flashover. [ 34 ] The process is described in Figure 9.…”

Section: Discussionmentioning

confidence: 99%

Effect of morphology and particle size of bismuth ferrite filler on the surface insulation of epoxy resin composites

et al. 2020

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The morphology and particle size of nanofillers have specific effects on their micro-distribution parameters in the polymer matrix and macro-properties of composites. In this study, bismuth ferrite nanoparticles (BFO) with different particle sizes were prepared by the sol-gel route, and bismuth ferrite nanofibers (fBFO) were synthesized by electrospinning method, then were blended with epoxy resin as a filler to prepare the epoxy composites with multiple filler concentrations. The morphology and crystal structure of the filler were characterized by SEM and XRD. The effect of filler morphology and particle size on the surface insulation of composites was studied. We found that fBFO nanofibers have better dispersion in epoxy matrix, and fBFO/EP composites have more excellent surface insulation properties. Meanwhile, as the particle size of the filler increases, the flashover voltages of the BFO/EP composites increase. Finally, the simulation model of electric field inside EP composites were established and the trap distribution was calculated by isothermal surface potential decay method. The influence mechanism of filler morphology and particle size on the surface insulation properties of EP composites was further analyzed. BFO particles and nanofibers as fillers blended with epoxy resin have a great engineering application potential.

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Trap distribution of polymeric materials and its effect on surface flashover in vacuum

Cited by 21 publications

References 31 publications

Liquefied Natural Gas for Superconducting Energy Pipelines: A Feasibility Study on Electrical Insulation

Liquefied Natural Gas for Superconducting Energy Pipelines: A Feasibility Study on Electrical Insulation

Improvement of surface flashover in vacuum

Effect of morphology and particle size of bismuth ferrite filler on the surface insulation of epoxy resin composites

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