Vacuum circuit breaker

Patent metadata

Field	Value
Publication number	US-2022013313-A1
Application number	US-201917295554-A
Country	US
Kind code	A1
Filing date	Jan 31, 2019
Priority date	Jan 31, 2019
Publication date	Jan 13, 2022
Grant date	—

Abstract

A vacuum circuit breaker includes: a vacuum valve that is insulated and supported inside a grounded tank; a movable-side frame connecting a lower end of a movable-side external conductor to a movable conductor; a stationary-side frame connecting a lower end of a stationary-side external conductor to a stationary conductor; a movable-side insulating support tube that supports the movable-side frame and insulates thereof from the grounded tank; a stationary-side insulating support tube that supports the stationary-side frame and insulates thereof from the grounded tank; a movable-side flange covering a movable-side end of the grounded tank; and a rubber piece on an inner peripheral surface of the movable-side flange. The movable-side insulating support tube is supported, at an end opposite from an end connected to the movable-side frame, by the movable-side flange via the rubber piece and is movable along an axis and a radius of an arc-extinguishing chamber.

First claim

1 . A vacuum circuit breaker comprising:
a grounded tank hermetically containing an insulating gas, the grounded tank being tubular; a vacuum valve insulated and supported inside the grounded tank, the vacuum valve including a movable contact and a stationary contact; a movable conductor electrically connected to the movable contact; a stationary conductor electrically connected to the stationary contact; a movable-side external conductor and a stationary-side external conductor disposed in a pair of bushings extending upward from the grounded tank; a movable-side frame electrically connecting a lower end of the movable-side external conductor to the movable conductor; a stationary-side frame electrically connecting a lower end of the stationary-side external conductor to the stationary conductor; an insulating operation rod connected to an operating device disposed outside the grounded tank to operate the movable contact; a movable-side insulating support tube to support the movable-side frame and insulates thereof from the grounded tank; a stationary-side insulating support tube to support the stationary-side frame and insulates thereof frame from the grounded tank; a movable-side flange covering a movable-side end of the grounded tank, the movable-side flange including a hole allowing passage of the movable-side insulating support tube; and a flexible member on an inner peripheral surface of the movable-side flange, wherein an arc-extinguishing chamber is formed by connecting:
the movable-side insulating support tube;
the movable-side frame;
the vacuum valve;
the stationary-side frame; and
the stationary-side insulating support tube, and the arc-extinguishing chamber is housed in the grounded tank, and
the movable-side insulating support tube is supported, at an end opposite from an end connected to the movable-side frame, by the movable-side flange via the flexible member and is movable along an axial direction and a radial direction of the arc-extinguishing chamber.

2 . The vacuum circuit breaker according to claim 1 , wherein the movable-side frame, the vacuum valve, and the stationary-side frame are connected by bolts.

3 . The vacuum circuit breaker according to claim 1 , wherein the movable-side insulating support tube has, at the end opposite from the end connected to the movable-side frame, a metal ring fixed to an outer periphery thereof.

4 . The vacuum circuit breaker according to claim 1 , wherein the flexible member is an O-ring.

Assignees

• Mitsubishi Electric Corp

Inventors

• Yoshitomo Yuji
• Sugino Kazuki

Classifications

• H01H33/56

  Gas reservoirs · CPC title

• H01H33/666

  Operating arrangements · CPC title

• H01H33/6664 Primary

  with pivoting movable contact structure · CPC title

• H02B13/045

  Details of casing, e.g. gas tightness · CPC title

• H01H2033/6665

  Details concerning the mounting or supporting of the individual vacuum bottles · CPC title