A new axial magnetic field contact three-quarters of coil for high-voltage vacuum interrupter and its properties

In order to make the vacuum circuit breaker used in high-voltage level, it is necessary to study the high voltage vacuum interrupter. This paper presented an axial magnetic field three quarters of the coil structure for high voltage level. Its axial magnetic field characteristics were calculated and analyzed with the Maxwell Ansoft software, The magnetic field produced by the structure is uniform, the maximum magnetic field value is 9.4mT, the minimum magnetic field value is 4.08mT, the uniform area of the maximum magnetic field is 0.25 dm2, 40% of the total area occupied by, and the residual magnetic field is small. The value is 2.8mT. The influence of the magnetic field strength and uniformity for the different slot positions of the contact was analyzed. The results showed that the slot position is in the right of the contact; the maximum magnetic field value is larger and more uniform. It also can enhance the arc control of the contact, promote arc converting to diffuse arc, improve the breaking capacity.