Analysis of axial magnetic field of coil type vacuum interrupter electrodes by comparing effective area at mid-gap plane

유효면적비교를 통한 COIL TYPE 진공인터럽터 전극의 측자계 분석

In this paper, we calculated the axial magnetic field at mid-gap plane between upper and lower electrode in vacuum interrupter by means of commercial finite element method Maxwell 3D and compared on the basis of "effective area" criterion. The models used in this paper are coil type(axial magnetic field) vacuum interrupter electrodes which have different numbers of coil segment. We used Dr. Schulmann's experimental equation which indicates minimum critical value of axial magnetic field to diffuse arc.