Gas circuit breaker

Patent metadata

Field	Value
Publication number	US-2021175030-A1
Application number	US-201716768648-A
Country	US
Kind code	A1
Filing date	Dec 1, 2017
Priority date	Dec 1, 2017
Publication date	Jun 10, 2021
Grant date	—

Abstract

A gas circuit breaker that can reduce deterioration of insulation performance thereof and current breaking performance thereof by the unnecessary gas generated from the arc-extinguishing gas sprayed to the arc is provided. The gas circuit breaker includes a sealed container (8) which arc-extinguishing gas is filled therein, a first fixed contactor (2) which is fixed to the sealed container (8), a second fixed contactor portion (4) which is fixed to the sealed container (8), and a movable contactor portion (3) which moves between the first contactor portion (2) and the second contactor portion (4), and which conducts and breaks current between the first contactor portion (2) and the second contactor portion (4), in which an arc generated between a fixed arc contactor (21) provided to the first fixed contactor portion (2) and a movable arc contactor (31) provided to the movable contactor portion (3) at a time of current breaking action is extinguished by an arc-extinguishing gas being sprayed thereto, and the gas circuit breaker (1) includes a gas chamber (5) to accumulate an unnecessary gas generated from the arc-extinguishing gas sprayed to the arc.

First claim

1 .- 26 . (canceled)

27 . A gas circuit breaker comprising:
a sealed container which arc-extinguishing gas is filled therein; a first fixed contactor which is fixed to the sealed container; a second fixed contactor portion which is fixed to the sealed container; and a movable contactor portion which moves between the first contactor portion and the second contactor portion, and which conducts and breaks current between the first contactor portion and the second contactor portion, wherein:
an arc generated between a fixed arc contactor provided to the first fixed contact or portion and a movable arc contactor provided to the movable contactor portion at a time of current breaking action is extinguished by an arc-extinguishing gas being sprayed thereto,
the gas circuit breaker comprises a gas chamber to accumulate an unnecessary gas generated from the arc-extinguishing gas sprayed to the arc,
the sealed container is in a shape in which ends of two truncated cone portions with large diameter are joined, and
the air chamber is formed in a portion where two truncated cone portion forming the sealed container is joined.

28 . The gas circuit breaker according to claim 27 , wherein the air chamber is formed by an air chamber which accumulates the unnecessary gas with specific gravity heavier than the arc-extinguishing gas, and which is arranged in a ground plane side of the sealed container.

29 . The gas circuit breaker according to claim 27 , wherein the air chamber is formed by an air chamber which accumulates the unnecessary gas with specific gravity lighter than the arc-extinguishing gas, and which is arranged in a side opposite to ground plane of the sealed container.

30 . The gas circuit breaker according to claim 27 , wherein a catalyst which decomposes the unnecessary gas is placed in the air chamber.

31 . The gas circuit breaker according to claim 30 , wherein the catalyst includes at least one of manganese, aluminum, cerium, barium, platinum, palladium, rhodium, and ruthenium.

32 . The gas circuit breaker according to claim 27 , wherein an adsorbent which adsorbs the unnecessary gas is placed in the air chamber.

33 . The gas circuit breaker according to claim 32 , wherein the adsorbent is an activated carbon.

34 . The gas circuit breaker according to claim 27 , wherein:
the air chamber is formed by a first air chamber which accumulates the unnecessary gas with specific gravity heavier than the arc-extinguishing gas and which is arranged in a ground plane side of the sealed container, and a second air chamber which accumulates the unnecessary gas with specific gravity lighter than the arc-extinguishing gas, and which is arranged in a side opposite to ground plane of the sealed container, and
the gas circuit breaker comprises:
a processing portion which is arranged outside the sealed container, and which decomposes the unnecessary gas generated from the arc-extinguishing gas sprayed to the arc;
a first discharge pipe which sends the unnecessary gas from the first air chamber to the processing portion;
a second discharge pipe which sends the unnecessary gas from the second air chamber to the processing portion; and
an air supplying pipe which sends the arc-extinguishing gas which the unnecessary gas is decomposed to the sealed container.

35 . The gas circuit breaker according to claim 27 , comprising at least one of:
an exhaust pipe which exhausts ozone with specific gravity heavier than the arc-extinguishing gas among the unnecessary gas generated from the arc-extinguishing gas and which is arranged in the ground plane side of the sealed container, and an exhaust pipe which exhausts carbon monoxide with specific gravity lighter than the arc-extinguishing gas among the unnecessary gas generated from the arc-extinguishing gas and which is arranged in the side opposite to ground plane of the sealed container.

36 . The gas circuit breaker according to claim 27 , comprising a sensor which detects the unnecessary gas generated from the arc-extinguishing gas sprayed to the arc.

37 . The gas circuit breaker according to claim 36 , wherein the sensor is at least one of an ozone sensor which detects ozone with specific gravity heavier than the arc-extinguishing gas among the unnecessary gas generated from the arc-extinguishing gas and which is arranged in the ground plane side of the sealed container, and a carbon monoxide sensor which detects carbon monoxide with specific gravity lighter than the arc-extinguishing gas among the unnecessary gas generated from the arc-extinguishing gas and which is arranged in the side opposite to ground plane of the sealed container.

38 . The gas circuit breaker according to claim 27 , wherein the arc-extinguishing gas is equal to or more than 1 MPa-g, and includes equal to or more than 50% of carbon dioxide.

39 . A gas circuit breaker comprising:
a sealed container which arc-extinguishing gas is filled therein; a first fixed contactor which is fixed to the sealed container; a second fixed contactor portion which is fixed to the sealed container; and a movable contactor portion which moves between the first contactor portion and the second contactor portion, and which conducts and breaks current between the first contactor portion and the second contactor portion, wherein:
an arc generated between a fixed arc contactor provided to the first fixed contactor portion and a movable arc contactor provided to the movable contactor portion at a time of current breaking action is extinguished by an arc-extinguishing gas being sprayed thereto,
the gas circuit breaker comprises a gas chamber to accumulate an unnecessary gas generated from the arc-extinguishing gas sprayed to the arc,
the sealed container is in a truncated cone shape, and
the air chamber is formed by end of the truncated cone portion with large diameter forming the sealed container.

40 . The gas circuit breaker according to claim 39 , wherein the air chamber is formed by an air chamber which accumulates the unnecessary gas with specific gravity heavier than the arc-extinguishing gas, and which is arranged in a ground plane side of the sealed container.

41 . The gas circuit breaker according to claim 39 , wherein the air chamber is formed by an air chamber which accumulates the unnecessary gas with specific gravity lighter than the arc-extinguishing gas, and which is arranged in a side opposite to ground plane of the sealed container.

42 . The gas circuit breaker according to claim 39 , wherein a catalyst which decomposes the unnecessary gas is placed in the air chamber.

43 . A gas circuit breaker comprising:
a sealed container which arc-extinguishing gas is filled therein; a first fixed contactor which is fixed to the sealed container; a second fixed contactor portion which is fixed to the sealed container; and a movable contactor portion which moves between the first contactor portion and the second contactor portion, and which conducts and breaks current between the first contactor portion and the second contactor portion, wherein:
an arc generated between a fixed arc contactor provided to the first fixed contactor portion and a movable arc contactor provided to the movable contactor portion at a time of current breaking action is extinguished by an arc-extinguishing gas being sprayed thereto,
the gas circuit breaker comprises a gas chamber to accumulate an unnecessary gas generated from the arc-extinguishing gas sprayed to the arc,
the sealed container is in a cylindrical shape, and
the air chamber is arra

Assignees

• Toshiba Kk
• Toshiba Energy Systems & Solutions Corp

Inventors

• Iijima Takanori
• Uchii Toshiyuki
• Majima Amane
• Kato Norimitsu
• Shimamura Akira

Classifications

• H01H2033/566

  Avoiding the use of SF6 · CPC title

• H01H33/91 Primary

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

• H01H33/7023

  characterised by an insulating tubular gas flow enhancing nozzle (H01H33/7038 takes precedence) · CPC title

• H01H33/56 Primary

  Gas reservoirs · CPC title

• H02B13/055

  Features relating to the gas · CPC title