Hitachi, Ltd.

Yoichi Oshita

Hiroaki Hashimoto

Hajime Urai

Katsuhiko Shiraishi

Yasuaki Aoyama

Masanao Terada

Ayumu Morita

Toshiaki Rokunohe

Tatsuro Kato

Makoto Hirose

Masataka Sasaki

Noriyuki Yaginuma

Hisashi Urasaki

Yuki Nakai

A bidirectional driving mechanismhas a drive-side linkage rod, a driven-side linkage rod, two leversthat link the drive-side linkage rod with the driven-side linkage rod, and a guidethat regulates the operation of the drive-side linkage rodand the driven-side linkage rod. A moveable pinis passed through a first groove camof the drive-side linkage rod, a second groove camof the guide, and third groove camsof the levers, and by operation of the drive-side rod, the moveable pinmoves within the respective groove cams, causing the leversto rotate, the driven-side linkage rodto be driven in a direction opposite to the drive-side linkage rod, and a driven-side arc electrodeto be driven in a direction opposite to a drive-side arc electrode

Gas circuit breaker

The invention is intended to provide a circuit breaker or a circuit breaker operating method enabling a current interruption action to be performed efficiently. A circuit breaker is characterized in that includes a fixed contact and a movable contact that comes in and goes out of contact with the fixed contact; a main circuit conductor that is electrically connected to the fixed contact and the movable contact; an operating mechanism including a mover configured by concatenating permanent magnets or magnetic materials alternately having opposite N and S magnetic polarities along the direction of motion axis of the movable contact and magnetic poles disposed to face the N and S magnetic polarities of the mover and wound with windings; a current detector that detects a current flowing through the main circuit conductor; and a control device that varies the amount of a current to be supplied to the windings of the magnetic poles, depending on a current value detected by the current detector.

Circuit breaker and circuit breaker operating method

A gas circuit breaker includes a driving side electrode having a driving side main contact and a driving side arc contact, and a driven side electrode having a driven side main contact and a driven side arc contact in a sealed tank. The driving side electrode is connected to an operation device. The driven side electrode is coupled to a bidirectional driving mechanism unit. A sliding guide, on which the driven side main contact slides, is provided on an inner periphery side of the driven side main contact. The driven side main contact is energized by a coil spring in a direction of the sliding guide and has two contact surfaces. Only during normal conduction, one of the contact surfaces contacts a projected portion of the sliding guide and the other of the contact surfaces contacts the driving side main contact.

The invention provides a switchgear that is capable of increasing a degree of freedom of a position of a moving arcing contact in a circuit breaker, does not require dimension management of components and a mechanism for adjusting a position of the moving arcing contact, and is capable of simplifying fabrication of components and assembly of devices and reducing cost. The switchgear according to the invention includes: a circuit breaker that is configured of a fixed arcing contact installed at a fixed-side conductor and a moving arcing contact installed at a moving electrode that opens and closes with respect to the fixed arcing contact; a linear motor that generates drive force for operating the moving arcing contact; a position detecting device that detects a position of a moving element of the linear motor; a contact detecting device that detects a contact state between the fixed arcing contact and the moving arcing contact; and a control device that sets a moving range of the moving arcing contact by controlling a voltage and a phase to be supplied to the linear motor based on the contact state between the fixed arcing contact and the moving arcing contact, which is detected by the contact detecting device, and position information of the moving element of the linear motor, which is detected by the position detecting device.

Switchgear

Provided is a gas circuit breaker that can reduce control energy smaller than that in previous double motion systems and an excessive force applied to a moveable pin to achieve a highly reliable double motion system. A gas circuit breaker has a double motion mechanism unit including a driving-side connecting rod, a driven-side connecting rod, a lever to connect the rods, and a guide to define the motion of the driving-side and driven-side connecting rods. A moveable pin extends through a first grooved cam of the driving-side conencting rod, a second grooved cam of the guide, and a third grooved cam of the lever. The driving-side connecting rod operates to move the moveable pin inside the grooved cams. Thus, the lever is rotated, the driven-side connecting rod is driven opposite to the driving-side connecting rod, and the driven-side arcing contact is driven opposite to the driving-side arcing contact.

An object is to provide a switchgear having a simple structure. To solve the problem, a switchgear according to the invention is characterized by having a fixed side electrode, a movable side electrodeconfigured to come into contact with or separate from the fixed side electrode, and an operating mechanism configured to allow drive force for movement of the movable side electrodeto be generated, wherein the operating mechanism for operating the movable side electrodeincludes one operating mechanism, and the one operating mechanism allows the movable side electrodeto stop at three or more positions.

Growing community of inventors

Tokyo, Japan

Yoichi Oshita