Synergic effect of adsorbed gas and charging on surface flashover

Li, Shengtao; Yin, Hang; Min, Daomin; Qu, Guanghao; Niu, Huan; Li, Zhen; Wang, Weiwang; Li, Jianying; Liu, Wenfeng

doi:10.1038/s41598-019-41961-0

Cited by 39 publications

(34 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Generally, the charge density on a single trap level follows Femi-Dirac distribution. The double exponential function, and surface trap level and density were calculated in the following equation [6], [35]:…”

Section: Discussionmentioning

confidence: 99%

“…In that program, we compared the effects of deep and shallow surface traps on the charge transport process. The double-trap flashover calculation program is comprised of 6 steps [6], [25], [26]: 1) Set initial physical parameters. Input sample thickness, permittivity, voltage rise rate.…”

Section: E Calculation Of Surface Flashover Voltagementioning

confidence: 99%

“…where, (t 0 ) is the primary SPD surface potential in V. The left part of (6) is controlled by both surface deep and surface shallow traps in (3), so the carrier mobility of deep and shallow traps can be calculated by (6). Fig.…”

Section: Mobility Analysismentioning

confidence: 99%

“…Epoxy resins (EP) with excellent mechanical and electrical performance are used extensively in advanced spacecraft and extra-high voltage power applications [1]- [5]. However, surface flashover is an intractable problem for that epoxy-based equipment because the surface flashover voltage is lower than the breakdown voltage with the same gap distance [6]. Therefore, it's important to improve surface flashover performance for epoxy resin.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Unraveling the “U-Shaped” Dependence of Surface Flashover Performance on the Surface Trap Level

Yin

et al. 2019

IEEE Access

Self Cite

View full text Add to dashboard Cite

The effects of surface traps on surface flashover remain controversial. To clarify the relation between surface flashover and surface trap level, in this work, the surface trap level of epoxy composites was modified by nanoparticles incorporation, electron beam irradiation, and ozone treatment. Surface trap characteristics were analyzed by surface potential decay. Surface flashover voltages were measured in a vacuum for dc voltage and in SF 6 for ac voltage. The ''U-shaped'' curve is founded to describe the relation between surface flashover voltage and surface deep trap level, surface flashover voltage first decreases and then increases with surface deep trap level. Enhancement of surface flashover voltage is attributed to reduced surface charge density, which was calculated by a double-trap flashover model. The simulation results indicate that the surface charge density on left side of ''U-shaped'' curve is controlled by surface shallow traps, whereas that on the right side is determined by surface deep traps. The effects of surface shallow and deep traps on surface charge accumulation and dissipation are used to demonstrate the reduced surface charges and improved surface flashover voltage for the ''U-shaped'' curve. The proposed ''U-shaped'' curve offers a promising way to improve surface flashover performance for high-voltage applications by tailoring surface trap characteristics with surface modifications. INDEX TERMS Surface flashover, surface trap level, surface charge, epoxy composites.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: E Calculation Of Surface Flashover Voltagementioning

confidence: 99%

Section: Mobility Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Unraveling the “U-Shaped” Dependence of Surface Flashover Performance on the Surface Trap Level

Yin

et al. 2019

IEEE Access

Self Cite

View full text Add to dashboard Cite

show abstract

“…Surface discharge is undesired gas breakdown that occurs on a surface at a high voltage, lower than the breakdown voltage of the insulating gas. This breakdown is attributed to the weak point of the dielectrics used and their interactions within the power equipment [10,12,13].…”

Section: Introductionmentioning

confidence: 99%

Surface Discharge Mechanism on Epoxy Resin in Electronegative Gases and Its Application

Park

Lim²,

Bae

2020

Applied Sciences

View full text Add to dashboard Cite

This study presents the surface discharge characteristics of insulating gases, including sulfur hexafluoride (SF6), dry air, and N2, under a non-uniform field. Surface discharge experiments were conducted, with the gas pressure ranging from 0.1 to 0.6 MPa, on samples of epoxy dielectrics under an AC voltage. The experimental results showed that the surface insulation performance significantly improved in insulating gases possessing electronegative gases, such as SF6 and dry air. Surface flashover voltages of SF6 were saturated with an increasing pressure, compared to dry air and N2. The surface discharge mechanism is proposed to explain the improvement and saturation of dielectric characteristics of the electronegative gas in complex dielectric insulations, as well as its influence on the surface flashover voltage. As an application, an insulation design method is discussed with regards to replacing SF6 gas in high-voltage power equipment based on the knowledge of the physics behind gas discharge.

show abstract

Effect of Gas Environment on Metal‐Support Interactions of Supported Metal Catalysts

Jin,

Wang,

et al. 2024

ChemCatChem

View full text Add to dashboard Cite

Supported‐metal catalysts, pivotal for industrial applications, have their catalytic properties affected by metal‐support interactions (MSIs), which notably influence both their electronic and geometric characteristics. Therefore, understanding internal and external factors that influence MSIs is crucial for the rational design of catalysts. Our minireview focuses on the effects of the gas environment on the MSIs, particularly the morphological changes in metal nanoparticles, the migrating behavior of reducible supports (strong metal‐support interaction), and the compositional rearrangement of the catalysts (reactive metal‐support interaction). Future directions are suggested to elucidate the fundamental aspects of gas environment induced structural reconstruction of catalysts, including the quantitative analysis of dynamic behavior of both the surface and interface, atomic‐level insights into the structures of the metal, support, and interface under pertinent conditions through advanced in situ/operando characterization, and the in situ manipulation of structural reconstruction.

show abstract

Synergic effect of adsorbed gas and charging on surface flashover

Cited by 39 publications

References 29 publications

Unraveling the “U-Shaped” Dependence of Surface Flashover Performance on the Surface Trap Level

Unraveling the “U-Shaped” Dependence of Surface Flashover Performance on the Surface Trap Level

Surface Discharge Mechanism on Epoxy Resin in Electronegative Gases and Its Application

Effect of Gas Environment on Metal‐Support Interactions of Supported Metal Catalysts

Contact Info

Product

Resources

About