Kabushiki Kaisha Toshiba

Toshiba Energy Systems & Solutions Corporation

Tooru Inoue

Yoshiaki Ohda

Satoshi Marushima

Yoshikata Kobayashi

Masaharu Shimizu

Hirokazu Takagi

Norimitsu Kato

Toshiyuki Uchii

Amane Majima

Tomohiro Hasegawa

Tsutomu Tanaka

Akira Shimamura

Tadashi Mori

Takanori Yasuoka

Satoi Ogawa

An opening/closing device of an embodiment has first to third movable contacts, first to third transmission mechanisms, first to third containers, a crankshaft, an operating mechanism, and a shock absorbing mechanism. The first to third movable contacts are accommodated in the first to third containers. The first to third transmission mechanisms are connected to the first to third movable contacts. The first to third containers accommodate at least the first movable contact. The crankshaft operates the first to third transmission mechanisms and changes the first to third movable contacts from a closed state to an open state. The operating mechanism is disposed on the side of the first transmission mechanism to rotate the crankshaft. The shock absorbing mechanism is disposed on the side of the third transmission mechanism to absorb a shock of rotational movement of the crankshaft.

Opening/closing device

A gas insulation apparatus has a sealed container, an insulation gas, a high-voltage portion, and a removal material. The insulation gas has COand Ofilling the sealed container as main components. The high-voltage portion is stored in the sealed container. The removal material reduces concentrations of HF, CO, and Oin the insulation gas.

Gas insulation apparatus

A gas circuit breaker of an embodiment includes a sealed container, a first contact part and a second contact part, an operation mechanism, an insulating nozzle, a pressure accumulator, and an electric field shield. The insulating nozzle is displaced in conjunction with the first contact part in a separation process of the first contact part and the second contact part. The insulating nozzle surrounds arc discharge generated between the first contact part and the second contact part. The electric field shield is attached to the insulating nozzle. The electric field shield has a floating potential during a period of at least part of the separation process. The electric field shield is electrically connected to the second contact part such that the electric field shield has the same potential in a completely open electrode state in which separation between the first contact part and the second contact part is terminated.

Gas circuit breaker

A piston rod () and a first piston () are arranged in the interior of an external cylinder () and internal cylinder (); a second piston for absorbing the change of volume of operating fluid () is also arranged therein. Also, a first return spring () for returning the piston rod () to the interruption position is provided and a second return spring () for returning the operating fluidinto the high-pressure chamber () by pressurizing the second piston () is provided. In addition, the air in the interior of the buffering device () is withdrawn by a vacuum pump (), and operating fluid () is thus introduced in a degassed condition.

Buffering device for the operating mechanism of a switchgear, and method of lubrication thereof

The circuit opening operation section of an embodiment of switchgear operation mechanism comprises: a circuit opening electromagnetic solenoid having a fitting structure that is provided with a step; and a solenoid spacer for adjusting the distance between a circuit opening trigger mechanism and the circuit opening electromagnetic solenoid. The circuit opening solenoid has: a solenoid housing fixed in position by way of the solenoid spacer; a plunger; and a stopper fitted to the solenoid housing so as to limit the sliding motion of the plunger in the plunger returning direction when the coil is not supplied with electric power. The limiting position of the stopper is adjustable.

Switchgear and operation mechanism for the same

According to an embodiment, a switchgear operating mechanism has a roller pin rotatably fixed to a leading end of a latch lever. A latch is fixed to a solenoid lever at a position different from the rotation axis of the solenoid lever, and has a leading end engageable with the roller pin. In a state where the switchgear operating state is shifted from the closed state to the cutoff state, the solenoid lever is pushed by an electromagnetic solenoid for cutoff so as to be rotated in an opposite direction to the biasing direction of the solenoid lever return spring, and the latch lever is rotated by a biasing force of the roller pin to release an engagement between the roller pin and the leading end of the latch, which causes a cutoff spring to discharge its energy to rotate the latch lever.

Growing community of inventors

Kanagawa-ken, Japan

Tooru Inoue