Gas circuit breaker

Patent metadata

Field	Value
Publication number	US-2017345593-A1
Application number	US-201715608041-A
Country	US
Kind code	A1
Filing date	May 30, 2017
Priority date	May 31, 2016
Publication date	Nov 30, 2017
Grant date	—

Abstract

A gas circuit breaker includes a sealed tank, a movable side main electrode and a fixed side main electrode in the sealed tank facing each other, a movable side arc electrode and a fixed side arc electrode in the sealed tank facing each other, a cylinder at a circumference of the movable side arc electrode, a piston in the cylinder in a slidable manner and forming a puffer chamber together with the cylinder, an insulation nozzle in the sealed tank, an exhaust pipe at a circumference of the fixed side arc electrode and exhausting heat gas, which is sprayed on an arc generated in the insulation nozzle in the opening electrode operation, to an outside, and a closing plate in the exhaust pipe. One or more vent holes leading the heat gas from an inside of the exhaust pipe to the outside is on a surface of the closing plate.

First claim

What is claimed is:

1 . A gas circuit breaker comprising:
a sealed tank; a movable side main electrode and a fixed side main electrode arranged in the sealed tank to face each other in such a manner in which opening electrode operation and closing electrode operation can be performed; a movable side arc electrode and a fixed side arc electrode arranged in the sealed tank to face each other in such a manner in which opening electrode operation and closing electrode operation can be performed; a cylinder arranged at a circumference of the movable side arc electrode; a piston arranged in the cylinder in a slidable manner, the piston forming a puffer chamber together with the cylinder; an insulation nozzle arranged in the sealed tank; an exhaust pipe arranged at a circumference of the fixed side arc electrode and configured to exhaust heat gas, which is sprayed on an arc generated in the insulation nozzle in the opening electrode operation, to an outside; and a closing plate arranged in the exhaust pipe, wherein one or more vent hole(s) which leads the heat gas from an inside of the exhaust pipe to the outside is formed on a surface of the closing plate.

2 . The gas circuit breaker according to claim 1 , wherein a plurality of the closing plates is arranged in the exhaust pipe.

3 . The gas circuit breaker according to claim 2 , wherein a total area of the vent holes of an outer side closing plate which is arranged farthest from the insulation nozzle among the closing plates is less than a half of a total area of the vent holes of the inner side closing plate which is arranged closest to the insulation nozzle among the closing plates.

4 . The gas circuit breaker according to claim 2 , wherein a plurality of the vent holes is formed on the surface of each of the closing plates, and
the vent holes of an inner side closing plate which is arranged closest to the insulation nozzle among the closing plates are formed such that at least 90% or more of a total area of the vent holes is formed on a different axis of the vent holes of an outer side closing plate which is arranged farthest from the insulation nozzle among the closing plates.

5 . The gas circuit breaker according to claim 2 , wherein a plurality of the vent holes is formed on the surface of each of the closing plates,
the vent holes of an inner side closing plate which is arranged closest to the insulation nozzle among the closing plates are formed such that at least 90% or more of a total area of the vent holes is formed in a region within a diameter of two third of a radius of the inner side closing plate from a center of the inner side closing plate, and the vent holes of an outer side closing plate which is arranged farthest from the insulation nozzle among the closing plates are formed such that at least 90% or more of a total area of the vent holes is formed in a region out of a distance of two third of a radius of the outer side closing plate from a center of the outer side closing plate.

6 . The gas circuit breaker according to claim 2 , wherein a plurality of the vent holes is formed on the surface of each of the closing plates,
the vent holes of an inner side closing plate which is arranged closest to the insulation nozzle among the closing plates are formed such that at least 90% or more of a total area of the vent holes is formed in a region out of a distance of two third of a radius of the inner side closing plate from a center of the inner side closing plate, and the vent holes of an outer side closing plate which is arranged farthest from the insulation nozzle among the closing plates are formed such that at least 90% or more of a total area of the vent holes is formed in a region within a distance of two third of a radius of the outer side closing plate from a center of the outer side closing plate.

Assignees

• Hitachi Ltd

Inventors

• Nakai Yuki
• Terada Masanao
• Urai Hajime
• Iida Takashi
• Yaginuma Noriyuki

Classifications

• H01H33/91 Primary

  the arc-extinguishing fluid being air or gas · CPC title

• H01H71/326

  Sealed housings · CPC title

• H01H2221/088

  actuable from different directions · CPC title

• H01H71/10

  Operating or release mechanisms · CPC title

• H01H33/78

  wherein the break is in gas (in air at atmospheric pressure H01H33/77) · CPC title