Patent ID: 6376791
Filing Date: 2002-04-23
Classification: H01H

Abstract:
A vacuum valve, comprising:a stationary electrode and a moveable electrode, said stationary electrode facing said moveable electrode wherein said moveable electrode comprises: a contact element having a circular shape, the contact element having a middle circular region formed on a top surface thereof and centered around a center point of a circle defined by the top surface of said contact element, and said contact element having a toroidal region formed on the top surface thereof and that is adjacent to said middle circular region; an electrode disk plate mounted to a bottom surface of the contact element; a conduction column assembly containing a conduction column, a coil electrode mounted on a top of the conduction column and a coil support ring mounted on the coil electrode; and a plurality of peripheral coils that are disposed between said coil support ring and said electrode disk plate, said plurality of peripheral coils being positioned beneath said toroidal region of said contact element, wherein a distribution of a current density is unified throughout said moveable electrode, wherein said contact element having the circular shape has a radius defined along the circularly-shaped top surface of said contact element, and wherein a radial distribution of axial magnetic flux densities parallel to an arc produced between the moveable and stationary electrodes upon separation increases gradually from a center area toward a circumferential area of the contact element, a portion giving a maximum value (Bp) of the axial flux densities being located at a location of and beyond 70% of the radius of the contact element, and the maximum value (Bp) of the axial flux densities along any radial direction of the contact element being 1.4 to 2.4 times greater than an axial flux density of the center area (Bct) of the contact element.