Mitsubishi Denki Kabushiki Kaisha

Masami Kii

Yoshihiro Ueda

Koji Ibuki

A circuit interrupter consisting of a pair of contacts being relatively movable to be detachable in an arc extinct chamber filled with a fluid for arc extinction is disclosed. Also included are a chamber for storing the fluid pressurized in an arc space in which the arc is formed by the departing operation of the contacts and means for forming magnetic field in the arc space. The fluid for arc extinction is discharged from said chamber by opening a passage after departing the contacts for a specific distance and the arc is interrupted by puffing the fluid.

Circuit interrupter

A circuit interrupter comprises a pair of contacts which can be relatively moved to be detouchable in a fluid for arc extinction; a pressure chamber which is connected to an arc space to contain the fluid for arc extinction whose pressure is raised in the arc space; and a fluid passage which is closed until moving one contact for a specific distance and is opened to discharge the fluid in the pressure chamber through the arc space out of the pressure chamber after departing the contact for the specific distance whereby the arc extinction is performed by the puffing of the fluid.

Puffer type circuit interrupter

A circuit interrupter comprising an interrupting unit including an arc extinguishing chamber containing an arc extinguishing fluid and a pair of separable contacts disposed within the arc extinguishing chamber. The interrupter also comprises a fluid pressurizing means for compressing the arc extinguishing fluid in response to the contact opening operation and puffing the compressed fluid at an electric arc established between the separated contacts, and a pressure storing means for temporarily storing the compressed high pressure fluid for puffing the arc extinguishing fluid with the stored fluid pressure upon a decrease of the arc current to the zero value.

Circuit interrupter including arc extinguishing fluid pressurization

A circuit interrupter comprises a pressure chamber and an arc extinguishing chamber containing an arc extinguishing fluid and a pair of separable contacts. The pressure chamber includes a separation chamber including a guide member or a check valve for supplying a high pressure fluid derived from an electric arc generated between the contacts to the pressure chamber. The high pressure fluid supplied from the high pressure chamber extinguishes the arc between the contacts. The guide member or the separation chambers alleviate mixing of the hot high pressure fluid with the cold high pressure fluid in the pressure chamber, providing the circuit interrupter with an improved arc extinguishing capability.

Gas puffer-type circuit interrupter

A circuit interrupter comprising a first pressure chamber for quickly increasing the pressure of an arc extinguishing gas therein by utilizing the energy of an electric arc established between a pair of separable contacts, and a second pressure chamber disposed around the first pressure chamber for releasing the arc extinguishing gas together with the high pressure gas upon the decrease of the arc current. The arc is extinguished by high pressure arc extinguishing gas released from the second pressure chamber. The first and the second pressure chambers are connected by a communication port having a check valve therein to increase the pressure of the arc extinguishing gas within the second pressure chamber.

Self-extinguishing gas circuit interrupter

A circuit interrupter comprising a pressure chamber, disposed in fluid communication with an arc extinguishing chamber containing an arc extinguishing fluid, for temporarily storing the arc extinguishing fluid pressure-raised by the arc energy, the high pressure arc extinguishing fluid being puffed at an electric arc established between the separated contacts to extinguish it. The circuit interrupter further comprises means, for relaxing the electric field, disposed on one of the contacts and around an arcing region. The circuit interrupter is prevented from re-arcing due to the transient recovery-voltage after the arc current reaches the zero point, thereby ensuring a complete arc extinction in a short period of time.

Gas-blast type circuit interrupter

A circuit interrupter comprising a first and a second chamber both containng an arc extinguishing gas such as SF.sub.6 gas, each chamber defining a space independent of the other when a pair of contacts is closed. Between the first and second chambers a movable piston member is disposed for transmitting a pressure from the first chamber to the second chamber. When the arc extinguishing fluid in the first chamber is pressure-raised by the energy of an electric arc established between the contacts at their initial separation stage, the movable piston member is moved to compress the arc extinguishing fluid within second chamber. The arc extinguishing fluid thus compressed is puffed at the electric arc to extinguish it.

Self-extinguishing type circuit interrupter

A circuit breaker provided with an interrupter of the fluid blast type in which a gas in a chamber is increased in pressure by the arc energy in the chamber which holds the high pressure gas until a fluid path is made through openings provided in the course of circuit breaking operation of the breaker and blows the gas through the openings toward the arc drawn between contact members of the breaker for interrupting the arc. The interrupter comprises measures to prevent the pressure in the chamber from being excessively increased which otherwise would cause undesirable effects on arc quenching operation in the range of large arcing currents, while maintaining a proper fluid blast operation.

Circuit interrupter with pressure limiting

A circuit interrupter comprises a pair of contacts movable relative to one another into a separated or spaced apart position in a chamber containing a fluid for arc extinction, and includes a pressure chamber for storing the fluid for arc extinction which is pressurized by arcing occurring in the space between separating contacts. Structure is provided in association with the pressure chamber for preliminarily pressurizing the fluid depending upon the extent of movement of the contacts in a separating direction prior to separation thereof, and wherein an outlet from the chamber is opened after the contacts have separated, and the fluid for arc extinction in the pressure chamber is thus discharged through the arc space and the arc is interrupted by puffing of the fluid through the arc for arc extinction.

Circuit interrupter of the type producing a puff of arc extinguishing

A self-extinguishing circuit interrupter wherein a pair of separable contacts is disposed within an arc extinguishing gas. Energy of an electric arc established between the separated contacts is utilized to increase the pressure of the arc extinguishing gas, and the high pressure gas thus generated is introduced into a pressure chamber to be stored therein. When the arc current approaches zero, the high pressure gas within the pressure chamber is puffed to the arc to extinguish it. A plurality of pressure chambers are axially disposed, i.e., in the direction in which the movable contact moves, thereby improving the arc extinguishing capability of the circuit interrupter.

A circuit interrupter comprises a pair of contacts being relatively moved to be detachable in an arc extinct chamber filled with a fluid for arc extinction; a pressurizing chamber for storing the fluid pressurized in an arc space in which the arc is formed by the departing operation of the contacts; and speed control means for controlling a speed for departing the contacts to at least two steps and said speed control means is connected to a driving system for the contacts wherein the fluid is discharged through the arc space out of the arc extinct chamber after departing the contacts for a specific distance and the arc is interrupted by puffing the fluid.

Circuit interrupter having controlled rate of arc extinguishment

A circuit interrupter comprises a pair of contacts in a container filled with a gas for extinction; an insulation nozzle around the contacts to form an arc chamber; a gas chamber which is connected to the arc chamber under departing the contacts. The gas pressure in the arc chamber and the gas chamber is increased by the energy of the arc generated at the departing the contacts. When the arc current is large, the flow-out of the gas from the arc chamber and the gas chamber is decreased by the arc whereas the high pressure gas in the arc chamber and the gas chamber is discharged through the insulation nozzle into the container at the time decreasing the arc current near zero whereby the arc is interrupted by the gas flow discharged.

Gas pressure circuit interrupter

An improved self-extinguishing puffer-type circuit interrupter comprising a casing filled with an arc extinguishing gas such as SF.sub.6 gas and including a pair of separable contacts, wherein the arc extinguishing fluid is pressure-raised by the energy of an electric arc, established upon the separation of the contacts, to be puffed to the arc to extinguish it. The interrupter includes means for releasing the arc extinguishing gas to the exterior of the extinguishing chamber when the pressure within the pressure-raising chamber in which the gas is pressurized by the arc energy reaches a certain value. The interrupter may include a valve, disposed between the pressure-raising chamber and the arc extinguishing chamber, adapted to open only when the pressure in the pressure-raising chamber is less than that above-mentioned certain pressure value.

A circuit interrupter of the self-extinguishing type in which a high pressure fluid generated by an electric arc established between separable contacts is utilized in the extinction of the arc. The interrupter comprises separable contacts, a pressure-raising chamber containing an arc extinguishing gas and an arc extinguishing chamber for puffing and releasing the high pressure arc extinguishing gas at substantially right angles to the electric arc established between the separated contacts.

A self-extinguishing-type of fluid-blast circuit-interrupter is provided, of the single-break type, utilizing a plurality of pressure-generating chambers disposed in series relation, and compartmentalizing the extinguishing chambers so as to act transversely on series portions of the singly-drawn arc. The two pressure-generating chambers are disposed opposite to the fluid-flow transmitting passages, so that there occurs a desirable reduction in temperature of the pressurized fluid prior to its subsequent injection into the arcing region.

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Amagasaki, Japan

Masami Kii