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Vacuum insulating switch gear

Patent Number: 8110771
Publication Date: 2012-02-07
Inventors: Tsuchiya, Kenji; Takahashi, Keiichi; Nakazawa, Akio; Kawakami, Hisao

A vacuum insulating switch gear formed by integrally molding with epoxy resin of a vacuum double-break three-position type switch including a movable contact, a fixed contact, and a vacuum container composed of an insulating cylinder for covering the movable contact and the fixed contact, a lower lid for closing a lower part of the insulating cylinder, and an upper lid for closing an upper part of the insulating cylinder and an operation rod side of the movable contact, and an earthing ...

Vacuum circuit breaker of tank type

Patent Number: 8110770
Publication Date: 2012-02-07
Inventors: Nagatake, Kazuhiro; Ichikawa, Hiroki; Katsumata, Kiyohito; Takeshita, Yukihiro

A vacuum circuit breaker includes a movable-side conductor that is tubular and comprises an inside cavity. A movable side contact case includes a chamber which communicates with a space on a non-vacuum side of a bellows. The chamber is isolated from a space filled with insulating gas in a ground tank by a sealing device. The chamber communicates with an outside atmosphere through the inside cavity of the movable-side ...

Vacuum circuit breaker

Patent Number: 8110769
Publication Date: 2012-02-07
Inventors: Bodenstein, Klaus; Lange, Detlef

The invention relates to a vacuum switch, especially a vacuum circuit breaker, for medium and high voltages, comprising a mobile switch unit arranged inside a vacuum switch compartment (1) and provided with mutually mobile elements including a contact tappet (17), an insulator (18), and a driving or switching rod (11) introduced into the vacuum switch compartment (1) by means of metal bellows. Said vacuum switch also comprises a fixed contact inserted into ...

Grounding switch

Patent Number: 8106326
Publication Date: 2012-01-31
Inventors: Shimizu, Yoshinori; Nakauchi, Shinichiro

A valley section is provided between a high-voltage arc contact and a high-voltage main contact. Because of the presence of the valley section, resistance between contacts is reduced while a moving arc contact makes contact with the high-voltage arc contact and then slides up to making contact with the high-voltage main ...

Arc resistant switchgear vertical exhaust system

Patent Number: 8101881
Publication Date: 2012-01-24
Inventors: Miller, Michael; de la Cruz, Abraham

An exhaust system for exhausting gases and molten debris caused by an electric arc within a switchgear. The exhaust system includes a switchgear having lower and upper compartments and an exhaust unit externally mounted to the switchgear. A wall panel of the switchgear includes blow out panels coinciding with openings in the lower compartment and corresponding ventilation flaps in a top surface of the exhaust unit to exhaust gas from the lower compartment out the blow out panels in a ...

Arc extinguishing device of circuit breaker for manual motor starter

Patent Number: 8097824
Publication Date: 2012-01-17
Inventor: Kil, Hwan Chang

Disclosed is an arc extinguishing device of circuit breaker for manual motor starter capable of swiftly extinguishing and discharging an arc generated by a fault current flowing into a motor circuit during an interruption operation of a circuit breaker, thereby enhancing the performance of ...