Multilayer High-Gradient Insulators

Harris, John R.

doi:10.1109/deiv.2006.357446

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…Besides, some insulation system optimisation methods can also suppress the development process of surface flashover through restraining the electron multipactor process. Since the high gradient insulator (HGI) was proposed, it has exhibited surface flashover characteristics [43][44][45][46][47]. Since HGI consists of many alternative layers of conductors and dielectrics, there are some problems in the poor bonding between conductors and dielectrics, difficult processing technology and high cost.…”

Section: ° Insulation Systemmentioning

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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Section: ° Insulation Systemmentioning

confidence: 99%

Improvement of surface flashover in vacuum

2020

High Voltage

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“…Therefore, it is important that proper insulation design techniques in the eco-friendly GIS and HVPE using N 2 and O 2 should be used to ensure their insulation performance. These enhancement design techniques have been presented based on the properties of insulating materials [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Study on oxygen/nitrogen gas mixtures for the surface insulation performance in gas insulated switchgear

Lim

Bae

2015

IEEE Trans. Dielect. Electr. Insul.

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This paper presents a comparative study on SF 6 alternative candidate gases for the surface insulation performance of eco-friendly Gas Insulated Switchers (GIS) and Solid Insulated Switchers (SIS). The candidate gases including N 2 /O 2 mixture gas, dry air, and compressed air were proposed based on AC surface flashover experiment. These gases were compared and examined based on their surface insulation performance, pressure and gap dependence, surface insulation reliability in different temperatures, economic feasibility and easiness of manufacture. The comparison results verified that dry air had excellent properties on the comparison criteria and was the most suitable eco gas among the candidate gases for eco-friendly GIS and SIS. In addition to the comparative study on the candidate gases, their surface flashover characteristics were described in detail based on the effect of moisture contained in the candidate gases on flashover voltage and the correlation among electric field intensity, collision-ionization coefficient, electron attachment coefficient, and gap length.

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“…Surface flashover of insulators in vacuum is generally the limiting factor in the design of high voltage vacuum devices. The most widely-accepted theory of surface flashover holds that --an avalanche of secondary electrons occurs along the insulator surface, desorbing gas through which the breakdown occurs [4][5][6][7]. The HGI overcomes the flashover by inhibiting the breakdown process using closely-spaced, floating conductors, encapsulated in a dielectric.…”

Section: High-gradient Insulatormentioning

confidence: 99%