Kabushiki Kaisha Toshiba

Tokyo Shibaura Denki Kabushiki Kaisha

Alsthom

Mitsuru Toyoda

Katsumi Suzuki

Hitoshi Mizoguchi

Edmond Thuries

Tsutomu Okutomi

Satoru Yanabu

Hisatoshi Ikeda

Eiichi Haginomori

Tadashi Mori

Masanori Ishimatsu

Hiromichi Kawano

The gas circuit breaker has a configuration such that a stationary contact section and a movable contact section are arranged in an arc-extinguishing gas sealed container, to face each other, and the movable contact section includes a hollow operating rod having an exhaust hole at its rear portion, a movable cylinder arranged around the rod, a hollow movable arc contact provided on the movable cylinder and an insulating nozzle surrounding the movable arc contact. The movable contact section further includes a stationary piston portion insertable/removable inside the movable cylinder, and the space formed by the movable cylinder and the current collecting cylinder fixed to the stationary piston portion is partitioned by a parting plate into a thermal pressure elevation room space at front side and a compression room space at rear side. During the electrode opening operation, the compression room space is compressed by the interaction between the movable cylinder and the piston portion, thus increasing the pressure in the space, and the speed of the movement of the operating rod is slowed down just before the completion of the electrode opening operation.

Gas circuit breaker

A puffer type gas insulated circuit breaker has releasably engaging stationary and movable arc contacts contained in a vessel filled with an arc extinguishing gas. An operation rod serving as a supporting member of the movable arc contacts has openings and helps define a puffer chamber. In the breaker, gas is pressurized by an arc generated between said stationary arc contacts and said movable arc contacts in an initial breaking phase, this gas being taken into the puffer chamber. The holes are used as a heat exhaust passage.

Puffer type gas insulated circuit breaker

A circuit breaker fitted with a parallel resistor and provided with main contacts and resistor contacts arranged electrically in parallel with the main contacts wherein the resistor is formed of a material selected from the group consisting of Cr, CrN, Cr.sub.3 C.sub.2, CrB, NiO and Mgo. The resistor element generally is made of a material in which the product of the specific heat expressed in Cal/g.degree.C. with the density expressed in g/cm.sup.3 is at least 0.7.

Circuit breaker provided with parallel resistor

A circuit breaker for a transmission line includes a plurality of main interrupters and a plurality of parallel resistor interrupters. In order to reduce an overvoltage on the transmission line, the main interrupters are closed at slightly different times.

Circuit breaker having a parallel resistor

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Yokohama, Japan

Mitsuru Toyoda