一种新型高压真空灭弧室触头及其特性

高压真空开关的核心部件之一是真空灭弧室，由于其触头开距较大，因此多采用纵向磁场触头，希望触头间隙有较强且较均匀的纵向磁场，这样可降低电弧电流密度，降低电弧能量，从而提高开断性能。该文提出了一种适合应用于高电压等级真空灭弧室的新型纵向磁场触头结构，该触头结构结构简单，便于加工，而且结构强度更好。利用有限元方法对这种新型的真空灭弧室磁向磁场触头间隙的磁场分布特性进行了计算与分析， 结果表明其磁场特性优于现有传统纵磁触头结构。利用这种新型触头结构制做了真空灭弧室样机，在单频LC振荡回路上进行了性能测试，结果表明在触头开距为40和60 mm时其同样具有良好的开断短路电流的性能。

A New Electrode Applied to High Voltage Vacuum Interrupter and its Performance

Vacuum interrupter is the core of high voltage vacuum switch. Because of the long contact gap, the axial magnetic field (AMF) contact is widely used to generate stronger and evener AMF in the contacts' gap. It can reduce arc current density and arc energy, so its interrupting performance is improved. A new AMF electrode applied to high voltage vacuum interrupter was introduced, it has some advantages such as simple structure, easy-machining, strong mechanism intensity and so on. Its axial magnetic field characteristic was calculated and analyzed with the solution of finite element. The calculation results indicated that the axial magnetic field characteristic for the new one is superior to a few traditional electrodes. The vacuum interrupter used the new electrode was tested in the synthetic test circuit, the short-circuit current interrupting ability was still excellent when the contact gap was 40 mm and 60 mm.