Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Takakazu Harada

Masahiro Arioka

Shinichi Miki

Kouichi Inagaki

Hiroshi Isoya

Hiromi Koga

Takayuki Itotani

Norio Kan

A coil electrode has a ring section provided on a plane perpendicular to the axis line of fixed-side and movable-side electrode rods on which the coil electrodes are mounted and concentrically with the axis line, a plurality of arm sections extended outward from the outer circumference of the ring section, circular-arc-shaped coil sections that are formed in such a way as to be bent in the circumferential direction from the respective front ends of the arm sections, and slits that separate the coil sections; the arm section of the coil electrode and the arm section of the coil electrode are arranged in the same direction so as to be superimposed on each other when viewed along the axis direction of the fixe-side electrode rod and the movable-side electrode rod.

Vacuum valve

A fixed electrodeand a movable electrode have coil electrodes formed of plural coil portions installed at both contacts and on a rear surface side in a divided manner in a circumferential direction along peripheries of the contacts such that a longitudinal field is generated in a direction in which the fixed contact and the movable contact come close to and move apart from each other. Protruding portions joined to the contacts are provided to tip ends of the respective coil portions to form joint portions to the respective contacts. A current to be flowed is controlled by changing resistance values between the contacts and the coil electrodes for each joint portion.

A vacuum interrupter for reducing contact resistance and thereby reducing electromagnetic repulsive force between electrodes, is obtained. The vacuum interrupter includes a stationary electrode rod fixedly placed on one closed end of a cylindrical evacuated envelope closed at both ends thereof; a movable electrode rod movably placed on the other closed end; disc shaped contacts placed on opposing ends of the electrode rods; and reinforcement members for reinforcing the contact placed between each electrode rod and the associated contact. In such a configuration, a coefficient of linear expansion of the reinforcement member differs from that of the contact, and the reinforcement member and the associated contact are jointed by soldering at a plurality of opposing parts thereof.

Vacuum interrupter

A gas-insulated switchgear comprising bushings mounted to and passing through a vessel wall of the hermetic vessel, each having an outer end connected to an insulated bus conductor at the outside of the hermetic vessel and an inner end connected to the electric device within the hermetic vessel. Each of the bushings has a central axis that is perpendicular to the common axis of the electric device and spaced apart from each other in the direction of extension of the common axis and shifted by a predetermined angle with respect to each other about the common axis. The flat bushing mounting vessel walls are tilted from inside to outside relative to other portion of the wall.

Growing community of inventors

Tokyo, Japan

Takakazu Harada