絶縁スペーサの真空中沿面破壊特性に及ぼす帯電電荷効果

概要

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It has been known that the accumulated charges along the surface of the conical spacer affect the creeping breakdown voltage, and the breakdown characteristics depend on the contact angles, the dielectric constant and applied pulse waves. This paper discusses the relation between breakdown characteristics and accumulated charges along the surface of conical spacer when subjected to dc stresses. The charging mechanism is based on the secondary electron emission characteristic of the insulator surface. The cone angle of the insulator varies from 0 to 60 degrees. The surface charge distribution was measured by using the surface electrometer. This is measured to examine the quantitative influence of the accumulated charges along the surface. Also, this is measured to compare with the theory style and the experiment result. As a result, it is concluded that the accumulated charges along the surface of the spacer by dc breakdown experiment are different from the value obtained by the secondary electron emission characteristic. Especially, the cone angle of the insulator is obvious with 45,60 degree in the case of positive polarity. Therefore, charging mechanism of the insulator due to electric force in addition to theory style until now is considered in this analysis. It is found that the calculation result of the induced equation is in accord with the experiment result.
東海大学の論文