# US 2014/0190938 A1 · Puffer type gas circuit breaker

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- Number: US 2014/0190938 A1
- Document ID: US20140190938A1
- Status: Published application
- Kind: A1
- Application number: 14/240,757
- Filed: 2012-08-02
- Published: 2014-07-10
- Earliest claimed: 2011-09-06
- Inventors: Masanori Tsukushi
- Web page: https://patentgrep.com/patent/US20140190938A1

## CPC

- H01H 33/88: the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
- H01H 33/7023: {characterised by an insulating tubular gas flow enhancing nozzle (H01H33/7038 takes precedence)}
- H01H 33/82: the fluid being air or gas
- H01H 33/905: {the compression volume being formed by a movable cylinder and a semi-mobile piston}
- H01H 33/91: the arc-extinguishing fluid being air or gas
- H01H 2033/908: {using valves for regulating communication between, e.g. arc space, hot volume, compression volume, surrounding volume}
- H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00)

## Abstract

This puffer type gas circuit breaker has: a stationary-side main contact 2 and a movable-side main contact 3, which are provided on the same axis inside a vessel 1 filled with an insulating gas; a stationary-side arcing contact 4; a movable-side arcing contact 5; a puffer cylinder 6; a puffer shaft 7 having a puffer chamber-side exhaust hole 7a and an operation rod-side exhaust hole 7b; a pressure-activated valve 15 for closing the operation rod-side exhaust hole 7b; a puffer piston 9; a flow control section 11 having an opening part 11a; and an insulating nozzle 12. When the interruption operation is completed, a predetermined space is formed inside a puffer chamber 10, the puffer chamber-side exhaust hole 7a and the opening part 11a are connected together, and the operation rod-side exhaust hole 7b is closed by the pressure-activated valve 15.

## Claims

### Claim 1

A puffer type gas circuit breaker comprising:
a vessel being filled with insulating gas;
a stationary-side main contact and a movable-side main contact that being provided in the vessel and on the same axis so that they position to face each other in opposite directions;
a stationary-side arcing contact and a movable-side arcing contact that being concentrically provided inside the stationary-side main contact and the movable-side main contact respectively;
a puffer cylinder, the movable-side arcing contact being provided on the top end of the puffer cylinder;
a puffer shaft having a puffer chamber-side exhaust hole and an operation rod-side exhaust hole, the puffer shaft being concentrically provided inside the puffer cylinder;
a closing member closing the operation rod-side exhaust hole;
a puffer piston sliding on the inner surface of a space formed by the puffer cylinder and the puffer shaft;
a flow control section having an opening part, the opening part is communicable with the puffer chamber-side exhaust hole, the flow control section being provided on the puffer piston and in a puffer chamber formed by the puffer cylinder and the puffer shaft and the puffer piston; and
an insulating nozzle being provided concentrically with the movable-side arcing contact, the insulating nozzle blows an insulating gas compressed within the puffer chamber to the arc produced between the stationary-side arcing contact and the movable-side arcing contact;
wherein, when an interruption operation is completed,
a space having a given extent is formed in the puffer chamber; the puffer chamber-side exhaust hole communicate with the opening part; and the closing member closes the operation rod-side exhaust hole.

### Claim 2 (depends on 1)

A puffer type gas circuit breaker according to claim 1, wherein the closing member is a pressure-activated valve; the pressure-activated valve opens the operation rod-side exhaust hole activated by pressure increase in an arcing space when arc is produced; and the pressure-activated valve keeps the operation rod-side exhaust hole closed even when the pressure in the arcing space increases again after the completion of the interruption movement.

### Claim 3 (depends on 1)

A puffer type gas circuit breaker according to claim 1, wherein the closing member is an exhaust closing cylinder inside which the puffer shaft slides; and the exhaust closing cylinder closes the operation rod-side exhaust hole at the place in the vicinity of the final end of the stroke of the interruption movement.

### Claim 4 (depends on 1)

A puffer type gas circuit breaker according to claim 1, wherein an evaporable member that evaporates by a high-temperature gas is provided on the interrupting section-side of the inside of the puffer shaft.