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Deposited charges in dielectric material under electron-beam radiation have an important influence on dc vacuum surface flashover. This paper investigates the charge transport characteristics of polyimide under electron-beam radiation and dc voltage. Based on the actual size of electrodes and polyimide, a physical model of electron-beam radiation is proposed. Considered the processes of charge deposition...
In this paper, a new organic insulation structure was proposed and prepared to improve the surface flashover performance in vacuum by inserting multilayer high gradient organic composite between the electrode and the dielectric. The simulation technique was used to calculate and analyze the electric field distribution of this new insulation structure. On the basis of theory analysis, the samples of...
Some insulating structures of Mo/Al2O3 cermet - Al2O3 ceramic - Mo/Al2O3 cermet were prepared to improve surface flashover performance in vacuum through co-firing, where the volume amount of Mo was managed from 2 to 50 vol% and there could exist one or two layers with different Mo amount in Mo/Al2O3 cermet. The influences of Mo amount of Mo/Al2O3 cermet on the surface flashover voltage in vacuum of...
In this paper, ZnO varistor+Al2O3 ceramic+ZnO varistor insulators were made, in which the conductivity and permittivity of ZnO varistors were controlled by changing its voltage gradient. Then the influences of conductivity and permittivity of ZnO varistors on the DC and pulsed surface flashover voltage in vacuum were experimentally investigated. The experimental results indicated that the DC and pulsed...
In this paper, A-B-A insulators were designed to improve the characteristics of surface flashover in vacuum by adjusting conductivity and permittivity of layer A. According to electric field theory of series dielectrics, the DC and pulsed field distributions of the insulators were calculated and the influences of conductivity and permittivity of Layer A on the electric field of vacuum-insulator-cathode...
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