Influence of the length and width of the slots of contact electrode on axial magnetic field at the mid-gap in 4 segment coil type vacuum interrupter

4 segment 코일타입 전극구조의 진공 인터럽터에서 접점전극의 슬롯의 길이와 폭이 전극사이의 측자계에 미치는 영향

Once high current flows through the vacuum interrupter, eddy current occurs due to the time-varying axial magnetic field caused by the current(AC) and it causes a decrease in axial magnetic field generated by current flowing through coil electrode. but if there are slots on contact electrode it is possible to increase the amplitude of axial magnetic field by reducing the influence of eddy current. there has been many studies about the number of slot of the contact electrode[1][2][3]. In this paper, in addition to these previous results we deal with the influence of the length and width of the slots on axial magnetic field at the mid-gap plane in 4 segment coil type vacuum interrupter by using 3D finite element method software.