Direct probing of the effective surface layer thickness during surface electrical breakdown along the solid dielectric and gas interface

Xu, Zheng; Li, Zhen; Zhang, Le; Li, Jianying; Li, Shengtao

doi:10.1016/j.apsusc.2019.143812

Cited by 8 publications

(5 citation statements)

References 63 publications

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“…Solid surface layer: Li and Zheng et al [114,116] However, in natural conditions, the surface of an insulating material cannot be absolutely smooth, and its roughness is usually about several micrometres. Therefore, the effective thickness of charge transport on a solid surface affecting the flashover along the surface is much thicker than 200 nm.…”

Section: Scale Of Multiple Phases In Surface Flashovermentioning

confidence: 99%

“…Solid surface layer : Li and Zheng et al. [114, 116] also evaluated the thickness of the solid surface layer by studying the DC surface flashover characteristics of iPP thin films deposited on glass and Al 2 O 3 substrates. The thickness‐dependent surface flashover voltage on the film can be divided into three regions, as shown in Figure 4d‐ii,iii: (İ) Rapidly increasing zone ( d ipp <34 nm), the energy depth of surface deep traps increases with the iPP thickness, and the surface flashover voltage increases rapidly.…”

Section: Competing Mechanisms Of Charge Transport In Surface Flashovermentioning

confidence: 99%

“…(d-i) V f as a function of electron energy and penetration depth of electrons[13]. (d-ii) V f as a function of thickness of iPP-glass[116] and (d-iii) iPP-Al 2 O 3 substrates[114].). iPP, isotactic polypropylene; SEE, secondary electron emission.…”

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confidence: 99%

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Surface flashover in 50 years: Theoretical models and competing mechanisms

Liu

Ohki

et al. 2023

High Voltage

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Surface flashover is a devastating electronic avalanche along the gas–solid interface when a high electric field is applied, which is a potential issue that threatens the safe operations of advanced power electronic, electrical, and spacecraft applications. However, the underlying physical mechanisms for surface flashover development are still under investigation owing to the complex charge transport processes through the gas phase, solid phase, and gas–solid interface. In this study, the history of surface flashover theory in the last 50 years is introduced, and several key questions are reviewed from the perspective of the competing mechanisms of charge transport: the role of each phase in a surface flashover, the origin of surface charging, and effects of traps in solid on surface flashover. Then, some suggestions involve charge transport processes in each phase, and their correlations are put forward, and a predictable ‘charge transport competitive flashover model’ is proposed by clarifying the competing mechanisms of charge transport processes through multiple phases. This study summarises the history and hot topics of physical mechanisms of surface flashover proposed based on classic and recent progress and offers promising routes for developing a more precise surface flashover theory and improving surface flashover performances.

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Section: Scale Of Multiple Phases In Surface Flashovermentioning

confidence: 99%

Section: Competing Mechanisms Of Charge Transport In Surface Flashovermentioning

confidence: 99%

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Surface flashover in 50 years: Theoretical models and competing mechanisms

Liu

Ohki

et al. 2023

High Voltage

Self Cite

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“…The electron tail phenomenon observed by Jaksts [94,95] can gain new understanding from this synergy model. Zheng et al [96] further measured the thickness of the effective surface layer. In order to improve the surface flashover performance of the gas-solid insulation system, starting from improving the gas adsorption capacity of the insulation surface, methods such as optimizing the insulator material and surface properties, and screening the insulation gas can be considered.…”

Section: 'Analogous Ineffective Region' Expansionmentioning

confidence: 99%

A review on factors that affect surface charge accumulation and charge-induced surface flashover

Yuan

Zou

et al. 2021

Nanotechnology

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The surface charge accumulation is very likely to trigger the surface flashover, which limits the large-scale application of DC GIL/GIS. This article comprehensively reviews the effect of six factors, including insulator-electrode shape, surface roughness of the insulator and conductor, metal particles, temperature, humidity, and gas type, on the insulator surface charging property. Furthermore, three models i.e. ‘analogous ineffective region’ expansion model, charge cluster triggered surface flashover model, and synergistic model of adsorbed gas, revealing the mechanism of charge triggered surface flashover phenomenon are reviewed and discussed. Future work from the perspective of theoretical analysis and engineering application are suggested in this field.

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“…The dimension of the simulated surface charge region is 2 mm in width and 7 mm in length, which are reasonable based on surface discharge images in sections 3.2 and 3.3. The thickness of the surface charge region is treated as zero based on the measurement of the ultrathin effective surface layer [56]. The surface charge density is selected to be from 100 to 700 pC mm −2 based on previous measurements [34,54,55].…”

Section: Estimation Of Average Streamer Propagation Velocitymentioning

confidence: 99%

Volume and surface memory effects on evolution of streamer dynamics along gas/solid interface in high-pressure nitrogen under long-term repetitive nanosecond pulses

Zhao

Huang

Wang

et al. 2020

Plasma Sources Sci. Technol.

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Evolution of the surface streamer and the discharge mode transition from the corona discharge to the surface flashover were investigated by pulse sequence resolved electrical and optical measurements under long-term repetitive nanosecond pulses (RNP). The test sample was a cylindrical epoxy resin insulator attached with a needle electrode in 0.1-0.4 MPa nitrogen. Under positive RNP, the inception phase of subsequent streamer discharges decreases with increasing the pulse repetition frequency (PRF), and a periodical streamer stagnation phenomenon appears at high gas pressure. Under negative RNP, the surface streamer does not illustrate symbolic decreasing tendencies in light intensity and corona inception phase in gas gap. The dependence of the evolution of surface streamer velocity on PRF is correlated with the repulsive force from surface charges and the accessibility of seed electrons. Statistical characteristics of back discharges under negative RNP are qualitatively explained by the local electric field around the triple junction. The reversal phenomenon of polarity effect of the allowable repetitive working coefficient is probably resulted from the corona stabilization effect, the surface electron detrapping process, and the assistance of background electric field. Principal results qualitatively support that behaviors of surface streamer and flashover are dominated by the electric field distribution, volume and surface memory effects as well as their interactions and bidirectional transformations, which are different from the monotonically facilitative tendency predicted by the metastable-species-dominated memory effect mechanism.

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Direct probing of the effective surface layer thickness during surface electrical breakdown along the solid dielectric and gas interface

Cited by 8 publications

References 63 publications

Surface flashover in 50 years: Theoretical models and competing mechanisms

Surface flashover in 50 years: Theoretical models and competing mechanisms

A review on factors that affect surface charge accumulation and charge-induced surface flashover

Volume and surface memory effects on evolution of streamer dynamics along gas/solid interface in high-pressure nitrogen under long-term repetitive nanosecond pulses

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