The Electric Field Analysis of A-B-A Insulators in Vacuum
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 triple junction and vacuum-layer A-layer B triple junction of A-B-A insulators were analyzed. It is found that by controlling the conductivity and permittivity of Layer A, the electric field of vacuum-insulator-cathode triple junction can effectively recede while the one of vacuum-layer A-layer B triple junction can be kept away from a high value. Then with the consideration of dielectric surface electrification, we analyzed the impact of layer A with different polar charges on its surface on the electric field of vacuum-insulator-cathode triple junction and vacuum-layer A-layer B triple junction. At last, we estimated the trend of surface flashover voltage in vacuum of A-B-A insulators under the condition of a continuous change of conductivity or permittivity of layer A.
surface flashover in vacuum A-B-A insulators triple junction electric field distribution surface charge
Tuo ZHANG Shengtao LI Jian SUN
State Key Laboratory of Electrical Insulation and Power Equipment Xian Jiaotong University, Xian, 710049, China
国际会议
哈尔滨
英文
701-704
2009-07-19（万方平台首次上网日期，不代表论文的发表时间）