Influence of surface roughness on the charging of insulating spacers in vacuum

Yamamoto, Osamu; Takuma, Tadasu; Hamada, Shoji; Kakehashi, Y.; Ikoma, Shingo; Nishimura, Kenichi; Shioiri, T.

doi:10.1002/eej.1029

Cited by 10 publications

(8 citation statements)

References 7 publications

(4 reference statements)

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“…With the movement of electrons to the anode, the number of electrons near the PMMA surface is relatively reduced, and the development of the electron avalanche is suppressed, resulting in the reduction of the number of electrons. Yamamoto et al studied the surface charge accumulation after the insulator applied voltage with different surface roughness in vacuum, and found that the amount of charge on the surface of the material decreased with the increase of the roughness, which was similar to the view of this paper [11]. It proves the correctness of this simulation from a certain extent.…”

Section: Influence Of Surface Roughness On Surface Charge Accumulationsupporting

confidence: 71%

The Simulation of Surface Charge Accumulation on PMMA with Different Surface Roughness in Vacuum

Yan¹,

Ren²,

Xie³

et al. 2017

EPE

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The surface insulation properties of insulating material under DC voltage are closely related to the characteristics of surface charge accumulation, and the surface roughness of these materials has a direct impact on the surface charge distribution in vacuum. Therefore, it is significant to study their connection. In this paper, based on the secondary electron emission avalanche model, the surface charge accumulation on polymethyl methacrylate (PMMA) with different surface roughness was simulated by using particle in cell and Monte Carlo Collision method. The simulated environment was under the finger shaped electrode and in vacuum. The results showed that under the action of the electric field the electrons emitted from the cathode triple junction moved forward and collided with the insulating material, which may lead to the generation of secondary electrons or the accumulation of surface charge. The surface charge near the cathode was mostly negative since the effect of surface electron injection was greater than that of the collision ionization. Due to the change of electron energy and the influence of electric field distribution, the number of positive charge on the insulator gradually increased, reached the maximum, and then gradually reduced with the approaching of the anode. Moreover, when the surface roughness of the material increases or the secondary electron emission coefficient decreases, the amount of surface charge accumulated on the PMMA will reduce. This paper can provide some guidance for the practical application of insulating materials.

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Section: Influence Of Surface Roughness On Surface Charge Accumulationsupporting

confidence: 71%

The Simulation of Surface Charge Accumulation on PMMA with Different Surface Roughness in Vacuum

Yan¹,

Ren²,

Xie³

et al. 2017

EPE

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“…He believed that horning treatment can let the surface of the insulator have uniform conductivity [26]. Since then, more and more scholars had begun to pay attention to the influence of the surface roughness of insulators on charge accumulation, especially from the perspective of electron emission and micro-discharge, and had conducted relative studies [34][35][36][37][38].…”

Section: Surface Roughnessmentioning

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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“…Nakanishi et al [11] and Guo et al [12] found that increasing insulator surface roughness can homogenize surface conductivity and thereby reduce surface charge accumulation. Yamamoto et al [13,14] examined the role of surface roughness in the vacuum flashover and found that the surface roughness has a large effect on the secondary electron emission characteristics. Shao et al [15] used plasma treatment to modify the surface structure and found that increasing the surface roughness would prolong the electric climbing distance during the flashover process.…”

Section: Introductionmentioning

confidence: 99%

Regulation mechanism of porous structures on flashover performances: combined effect of hindering collision ionization and corona stabilization

Li,

Zhu,

Luo

et al. 2023

J. Phys. D: Appl. Phys.

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The microscopic morphology is recognized as one of the key factors affecting the surface flashover strength, but the effect of nanoscale morphology is rarely investigated. In this paper, a novel strategy, namely, porous structural material was presented to improve the flashover strength, and porous nylon membranes with pore diameter from 100nm to 5000nm were used to explore the influence of micro/nano scale porous morphology on the flashover strength. The regulation mechanism of porous structures on flashover performances were explored through the analysis of potential scanning, partial discharge measurement, corona and flashover optical photos. The results indicated that the flashover strength under both AC and DC voltages could be significantly improved by the porous morphology, with a maximum increment of higher than 100%. It is believed that the improved flashover strength is attributed to the combined effect of hindering collision ionization and corona stabilization of porous structures. The present research provides a new insight for improving the surface insulation performance.

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Influence of surface roughness on the charging of insulating spacers in vacuum

Cited by 10 publications

References 7 publications

The Simulation of Surface Charge Accumulation on PMMA with Different Surface Roughness in Vacuum

The Simulation of Surface Charge Accumulation on PMMA with Different Surface Roughness in Vacuum

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

Regulation mechanism of porous structures on flashover performances: combined effect of hindering collision ionization and corona stabilization

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