Effects of corrugated insulator on electrical insulation in vacuum

Yamamoto, Osamu; Hara, Takehisa; Matsuura, Hideharu; Tanabe, Y.; Konishi, T.

doi:10.1016/0042-207x(96)00054-1

Cited by 8 publications

(1 citation statement)

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“…It was found that the electric field at triple junctions is mainly determined by the angle θ between insulator and electrode [7] , and hence the angle θ greatly affects the surface flashover performance in vacuum [12] . An insulator with several ribs was also designed to reduce the secondary electron emission and improve the charge distribution at the dielectric surface of the insulator [13] .…”

Section: Introductionmentioning

confidence: 99%

Improvement of Surface Flashover Performance of Al₂O₃Ceramics in Vacuum by Adopting A-B-A Insulation System

Li¹,

Zhang²,

Huang³

et al. 2011

Plasma Sci. Technol.

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A new insulation system with inorganic A-B-A insulators was proposed to improve the surface flashover performance in vacuum. Inorganic A-B-A insulator samples of Mo/Al2O3 cermet-Al2O3 ceramic-Mo/Al2O3 cermet were prepared, in which the conductivity and permittivity of the Mo/Al2O3 cermets were controlled through different amount of metallic molybdenum powder added. The effects of both conductivity and permittivity of Mo/Al2O3 cermets on the DC and impulse surface flashover voltage in vacuum were experimentally investigated. The result showed that the DC and impulse surface flashover voltage were improved by 52% and 95%, respectively. For the distribution of electric field, two triple junctions, i.e., vacuum-layer A-cathode (TJ1) and vacuum-layer A-layer B (TJ2) were prepared with the introduction of layer A into the A-B-A insulation system. Based on the electric field distribution obtained via electrostatic field simulation and Maxwell-Wagner three-layer model, the electric field of TJ1 decreases while that of TJ2 increases with the increase in conductivity and permittivity of layer A under applied DC and impulse voltage, respectively. Therefore, the improvement of surface flashover performance of A-B-A insulators has been reasonably explained.

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Section: Introductionmentioning

confidence: 99%