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In this paper, a new insulation system of ZnO varistor ceramic-Al2O3 ceramic-ZnO varistor ceramic insulators (defined as A-B-A insulators) is proposed to improve surface flashover performance in vacuum so that it is possible to reduce the electric field at the vacuum-insulator-cathode triple junction (CTJ) by changing the conductivity and permittivity of the ZnO varistor ceramic layer of the A-B-A...
The electrical and dielectric properties of a commercial ZnO-based varistor ceramics were measured in the process of 8/20mus impulse current degradation with a current density of 1725A/cm2. The characteristic of U-I in the pre-breakdown region was mainly investigated. It was found that the varistor voltage U1mA will first increase rapidly with the times of impulse, and then remain stable and finally...
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...
The influence of magnetized water on the electrical properties of ZnO varistor ceramics was investigated by electrical property measurement and frequency spectrum technology. It was found that, compared with results of deionized water, higher varistor voltage E1mA and lower non-linear coefficient alpha can be achieved by using 0.2 T magnetized water, while E1mA and alpha of 0.3T magnetized water are...
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