Analysis of Axial Magnetic Field electrode applied to high voltage Vacuum Interrupters

In order to develop high voltage and large capability vacuum circuit breaker, it is necessary to make sure that there is enough strong axial magnetic field even with long gap distance. In this paper, the magnetic field of those model at the long gap distance were calculated for the coil-type axial magnetic field electrode and the cup-type axial magnetic field electrode, the results show the axial magnetic field distribution on the midplane between the two electrodes, the effect of some electrode structure parameters and the relative position between the two electrodes on the axial magnetic field were studied. Based on the analysis of the results, a new electrode structure applied to high voltage vacuum interrupters was developed