Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Ishihara Sangyo Kaisha, Ltd.

Hiromi Koga

Shinichi Miki

Kenichi Koyama

Taiki Donen

Yasutomo Otake

Takakazu Harada

Toshinori Kimura

Atsushi Sawada

Noboru Nonoyama

Katsuya Jinno

Naoya Aihara

Yoshihiro Okawa

A vacuum interrupter according to the present disclosure is configured such that a linear resistive layer and a nonlinear resistive layer are disposed so as to cover at least a part of a periphery of an insulation container, and a magnitude relationship of each resistivity is R1>R3>R2, where a resistivity of the nonlinear resistive layer less than an operating electric field is R1, a resistivity less than or equal to an impedance when a lightning impulse is applied is R2, and a resistivity of the linear resistive layer is R3.

Vacuum interrupter

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.

At least one part of a road surface is covered by a photocatalyst layer containing a photocatalyst such as titanium dioxide, etc. to purify pollutants in exhaust gases emitted from vehicles by photocatalytic reaction of the photocatalyst. Pollutant-originating matters as retained on the photocatalyst layer are washed away by rain water or sprinkled water. In one embodiment of the invention, road is a road provided with a dewaterable pavement and rain water passes through surface layer during raining, flows over and along base layer and is discharged. In surface layer , numerous aggregates of small particle sizes are projected from the entire surface of concrete layer . Titanium dioxide layer is formed by injecting or spraying a mixture comprising titanium dioxide, cement, a filler and water onto the entire surface of surface layer thinly and is water-permeable.

Air purification-functioning road and method for purifying polluted air over road

A gas-insulated switchgear is miniaturized and bus-bars connected to bushings are simplified in configuration. A distance L between outer peripheries of a first vacuum interrupter and a second vacuum interrupter is established to be smaller than an external diameter D of the vacuum interrupters to and insulating barriers to are installed between the first vacuum interrupter and the second vacuum interrupter between the first vacuum interrupter and a hermetically sealed container between the second vacuum interrupter and the hermetically sealed container and between the first and second vacuum interrupters and and the third vacuum interrupter

Gas-insulated switchgear

A vacuum switch includes a pair of windmill-shaped electrodes within a vacuum tube and including windmill portions and contact portions. Each of the windmill-shaped electrodes is arranged such that a component of a magnetic flux parallel to a contact surface and serving as an arc driving force with respect to a range of 0.5 mm from the contacting surface contacting the contacting portion of a leg portion of an arc has a magnetic flux density equal to or larger than 0.01 tesla with respect to an electric current of 1 kA, at any point on the contacting surface. The ratio of an inner diameter Di of the contact portion to an outer diameter D of the windmill-shaped electrodes is equal to or greater than 0.4, the difference in thickness between the windmill portions and the contact portions is equal to or less than 5 mm, and each of the windmill-shaped electrodes is connected to one of the pair of electrode rods, and a ratio of a diameter d of the connection portion of the electrode rod to an inner diameter Di of the contacting portion is equal to or less than 0.6. The windmill-shaped electrodes may be a Cu&mdash;Cr material including 20-60 weight % of Cr.

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Tokyo, Japan

Hiromi Koga