Abstract: A vacuum capacitor includes a vacuum vessel, stationary and movable electrodes arranged in the vacuum vessel, and a bellows which follows the movable electrode to maintain the hermeticity of the inside of the vacuum vessel and which serves as a current path, wherein the bellows is formed of a conduction high-strength heat resisting alloy.

Abstract: A vacuum variable capacitor is includes of a vacuum container which is formed by sealing both end of a cylindrical insulator with a fixed-side end plate and a movable-side end plate, a movable conductive member which is disposed opposite to the fixed-side end plate in the vacuum container, a fixed electrode which is provided on the fixed-side end plate, a movable electrode which is provided on the movable conductive member, a bellows provided in the vacuum container, a rotating portion which is rotatably disposed outside of the vacuum container, and a ball screw through which the movable conductive member is supported by the rotating member.

Abstract: A vacuum variable capacitor includes an energization bellows arranged in a vacuum vessel and having ends mounted to a movable-electrode support plate and a movable side-end plate, respectively, a heat shielding bellows arranged inside the energization bellows and outside a slide-guide support and having ends mounted to the movable-electrode support plate and the movable side-end plate, respectively, and a cooling pipe interposed between the two bellows and for preventing transfer of heat generated in the energization bellows.

Abstract: A vacuum variable capacitor is comprises of a vacuum container which is formed by sealing both end of a cylindrical insulator with a fixed-side end plate and a movable-side end plate, a movable conductive member which is disposed opposite to the fixed-side end plate in the vacuum container, a fixed electrode which is provided on the fixed-side end plate, a movable electrode which is provided on the movable conductive member, a bellows provided in the vacuum container, a rotating portion which is rotatably disposed outside of the vacuum container, and a ball screw through which the movable conductive member is supported by the rotating member.

Abstract: A vacuum variable capacitor includes an energization bellows arranged in a vacuum vessel and having ends mounted to a movable-electrode support plate and a movable side-end plate, respectively, a heat shielding bellows arranged inside the energization bellows and outside a slide-guide support and having ends mounted to the movable-electrode support plate and the movable side-end plate, respectively, and a cooling pipe interposed between the two bellows and for preventing transfer of heat generated in the energization bellows.

Abstract: A vacuum capacitor includes a vacuum vessel, stationary and movable electrodes arranged in the vacuum vessel, and a bellows which follows the movable electrode to maintain the hermeticity of the inside of the vacuum vessel and which serves as a current path, wherein the bellows is formed of a conduction high-strength heat resisting alloy.

Abstract: The present invention relates to an sintered electric contact containing Cr in an amount of 15 to 30% by weight and Cu being balance as main components, 0.05 to 0.5% by weight of Te, 100 to 3000 ppm of O, 7.5 to 900 ppm of Al, and 15 to 750 ppm of Si.

Abstract: An attraction coil, a repulsion coil and a plunger are disposed in a magnetic path of an electromagnetic device. An starting flux generating section is disposed between the attraction coil and the repulsion coil in the magnetic path. A magnetic flux of the starting flux generating section is repulsed magnetically by a magnetic flux of the repulsion coil at a part of the magnetic path to start the plunger. The plunger is attracted to one of first and second magnetic path parts by electromagnetic forces generated from magnetic fluxes of the attraction coil and the repulsion coil.

Abstract: An adjuster nut is rotatably supported to a vacuum container of a vacuum variable capacitor of a vacuum variable capacitor device. The adjuster nut has a nut portion, and a shank made of an insulating material. The shank has a first end integrated with the nut portion and a second end adapted to be directly coupled with a rotational shaft of a driving portion of the vacuum variable capacitor device. Another type of the adjuster nut has a deformable bellows, a nut portion, and a shank made of an insulating material. A second end of the nut portion is coupled with a first end of the bellows. The shank has a first end coupled with a second end of a bellows, and a second end adapted to be directly coupled with the rotational shaft of the driving portion of the vacuum variable capacitor device.

Abstract: An adjuster nut is rotatably supported to a vacuum container of a vacuum variable capacitor of a vacuum variable capacitor device. The adjuster nut has a nut portion, and a shank made of an insulating material. The shank has a first end integrated with the nut portion and a second end adapted to be directly coupled with a rotational shaft of a driving portion of the vacuum variable capacitor device. Another type of the adjuster nut has a deformable bellows, a nut portion, and a shank made of an insulating material. A second end of the nut portion is coupled with a first end of the bellows. The shank has a first end coupled with a second end of a bellows, and a second end adapted to be directly coupled with the rotational shaft of the driving portion of the vacuum variable capacitor device.

Abstract: A vacuum capacitor and its manufacturing method are disclosed.

Abstract: A process for forming an electrode assembled into a vacuum interrupter is composed of the steps of blending silver(Ag) powder and chromium(Cr) powder in a content ratio such that Ag powder forms a matrix and Cr powder being dispersed therein, the blending ratio is prefer to be determined to contain 50 to 95 wt. % of Ag powder and 5 to 50 wt. % of Cr powder, compacting the blended powder to a compacted body, sintering the body at temperatures around melting point of Ag, and regulating density of the sintered article at least 90%. Particle size of Cr to be blended may be determined less than 150 .mu.m, more preferably, less than 60 .mu.m. Sintering temperature may be determined between 800.degree. to 950.degree. C.

Abstract: A method for forming an electrical contact material comprises the steps of melting a mixture of Cu and Cr into a molten alloy, atomizing the molten alloy into fine particles to obtain alloyed particles. Cr particles in the alloyed powder disintegrate to less than 5 .mu.m in mean particle diameter. The alloyed powder is sintered thereafter and a mean particle diameter of chromium in the sintered article is fined in a range of 2 to 20 .mu.m. An electrical contact material is composed of a copper matrix and chromium particles having a mean particle diameter of 2 to 20 .mu.m. The chromium particles are homogeneously dispersed in the copper matrix.

Abstract: A process for forming contact material of an electrode comprises the steps of preparing chromium of which oxygen content is substantially reduced, forming a molten mixture of the chromium and copper, atomizing the molten mixture into fine particles to obtain Cu-Cr alloyed powder, compacting Cu-Cr alloyed powder under desired pressure, and sintering the compacted alloyed powder. The oxygen content of the chromium may be reduced until less than 0.1 wt %. In a course of the process, a metal having melting point lower then copper may be blended. The metal may be blended in Cu-Cr alloyed powder, or blended in the molten mixture of copper and chromium. Alternatively, the process further includes the steps of forming a second molten mixture of copper and a metal having melting point lower than copper, atomizing the second molten mixture into fine particles to obtain alloyed powder of copper and the metal, and blending Cu-Cr alloyed powder with the alloyed powder of copper and the metal.

Abstract: An inventive vacuum interrupter has an improved dielectric strength and durability which leads to an improved interruption performance. The interrupter has a vacuum envelope comprising an insulating cylinder, a metal end plate hermetically sealed to one edge of the insulating cylinder, a bottomed metal cylinder with its open end hermetically sealed to the other edge of the insulating cylinder, and a metal bellows connected to the bottom of the metal cylinder. A stationary lead rod passes through the metal end plate and the insulating cylinder and terminates within the metal cylinder, an inner end of the stationary lead rod carrying a stationary electrode. A movable lead rod extends coaxially with the stationary lead rod, an inner end of the movable lead rod carrying a movable electrode. The movable lead rod is sufficiently longer than the stationary lead rod.

Abstract: A vacuum interrupter includes a vacuum envelope having a cylindrical metallic housing with at least one opening end and a disc-shaped and apertured end plate of insulating ceramics which is hermetically sealed to the opening end. One metallized layer to which the opening end is hermetically brazed is in an outer-diameter region of a sealing surface of the plate, while another metallized layer to which another metallic members of the envelope is hermetically brazed is formed in an inner-diameter region of the plate. There are provided, within the envelope near two spaced edges of the inner-diameter region and outer-diameter region metallized layers, metallized-layer-edge shields having opposite surfaces separated by a distance which is smaller than that between the metallized layers. Each of the opposite surfaces has extensions at the axial opposite ends so that each extension extends away from an extension of the other surface.