JPH09330638A - Gas circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress insulation deterioration, opening/closing inferiority and contact inferiority, by effectively removing metal vapor, metal particle and a compound particle just after breaking action in hot gas. SOLUTION: In a closed vessel 10 sealed with insulating gas, a fixed contact 1, movable contact 2 performing contact/separate action with/from the fixed contact 1, puffer cylinder 3 integrally provided with the movable contact 2, puffer piston 4 compressing insulating gas and a nozzle 5 guiding compressed insulating gas blown toward the fixed contact 1 are provided. In a peripheral part of the fixed contact 1, a gas passage cylinder 6, formed with a passage of insulating gas blown from the nozzle 5, is provided, between the fixed contact 1 and the gas passage cylinder 6, a mesh-shaped metal filter 7 is provided, so as to remove metal vapor, metal particle and a compound particle contained in insulating gas guided from the nozzle 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a puffer type gas circuit breaker.

[0002]

2. Description of the Related Art Generally, a puffer type gas circuit breaker extinguishes an arc by blowing an insulating gas compressed by a puffer piston and a puffer cylinder onto an arc generated between a fixed contact and a movable contact. ing. At that time, the insulating gas becomes a high-temperature exhaust gas (hereinafter referred to as a hot gas) whose insulating ability is lowered by thermal decomposition by an arc.
The hot gas contains metal vapor and metal particles generated by melting loss of the fixed contact and the movable contact, or fluorine, nitrogen and carbon compound particles generated by melting loss of the nozzle. These metal vapors, metal particles, and compound particles contribute to the reduction of the insulation ability, switching ability, and contact ability of the gas circuit breaker.
Therefore, in the conventional gas circuit breaker, the adsorbent is placed inside the closed container as a method of removing a part of them.

[0003]

In such a conventional gas circuit breaker, the first purpose of the adsorbent is to remove the impure gas in the hot gas, and to remove metal vapor, metal particles, and compound particles. It has the drawback of being difficult to remove.

Therefore, the present invention provides a gas circuit breaker capable of suppressing insulation deterioration, switching failure and contact failure by effectively removing the metal vapor, metal particles and compound particles in the hot gas immediately after the blocking operation. The purpose is to provide.

[0005]

According to the present invention, a fixed contact, a movable contact for performing a contact / separation operation with the fixed contact by a reciprocating motion, and a movable contact in a closed container in which an insulating gas is filled. A puffer cylinder provided integrally with the contact,
Gas cutoff having a puffer piston located in the puffer cylinder for compressing insulating gas, and a nozzle integrally provided with the movable contactor for guiding the compressed insulating gas and spraying it toward the fixed contactor. In the container, a gas passage tube that forms a passage for the insulating gas blown from the nozzle is provided on the outer peripheral portion of the fixed contact, and a mesh metal is provided between the fixed contact and the gas passage tube. A filter is provided to remove metal vapor, metal particles and compound particles contained in the insulating gas introduced from the nozzle.

As a result, the hot gas generated when the insulating gas is blown into the arc by the nozzle is metal vapor,
The metal particles and the compound particles are guided to the gas passage cylinder and reach the filter. When passing through the filter, metal particles and compound particles coarser than the mesh of the filter cannot pass through the filter and are removed. Further, when the metal vapor collides with the filter, heat is taken away and the metal vapor adheres to the filter.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a gas circuit breaker of the present invention will be described below with reference to FIGS. 1 and 2. 1 is a diagram showing the middle of the arc extinguishing operation, and FIG. 2 is a diagram showing a structural example of the filter. In a closed container 10 in which an insulating gas is filled, a fixed contactor 1, a movable contactor 2 that moves to and from the fixed contactor 1 by a reciprocating operation, and a movable contactor 2
A puffer cylinder 3 that is integrally provided with the movable contactor 2 and a puffer piston 4 that is located inside the puffer cylinder 3 to compress the insulating gas. And a nozzle 5 for spraying toward.

Further, there is provided a gas passage cylinder 6 which is provided integrally with the fixed contact 1 and forms a passage for the insulating gas sprayed from the nozzle 5. The gas passage cylinder 6 has a structure in which a function as a gas passage is added to a shield for preventing the electric field from concentrating on the fixed contact 1, for example. Further, in order to remove the metal vapor, the metal particles and the compound particles contained in the insulating gas guided by the nozzle 5, as shown in FIG. 1 and the gas passage cylinder 6 are arranged in the gas passage cylinder 6 so that there is no gap between them.

Next, the operation of the gas circuit breaker will be described.
When the movable contactor 2 and the puffer cylinder 3 are moved to the left in FIG. 1 by the shutting-off operation, the insulating gas compressed by the puffer piston 4 and the puffer cylinder 3 is guided by the nozzle 5 and separated. It is blown to the arc 9 generated between the movable contactor 2 and the fixed contactor 1 therein. The insulating gas blown to the arc 9 is guided by the nozzle 5 in the direction from the movable contact 2 to the fixed contact 1 while extinguishing the arc 9, and at that time, it is thermally decomposed by the energy of the arc 9. Hot gas 8
become.

The hot gas 8 contains metal vapor and metal particles generated by melting of the movable contact 2 and fixed contact 1, or fluorine, nitrogen and carbon compound particles generated by melting of the nozzle 5. Be done. This hot gas 8
Is guided into the gas passage cylinder 6, moves in parallel to the axial direction of the fixed contact 1, and passes through the filter 7. When passing through the filter 7, metal particles and compound particles that are coarser than the mesh of the filter 7 cannot pass through the filter 7 and are removed. Further, the metal vapor that collides with the filter 7 is deprived of heat and adheres to the filter 7. .

[0011]

As described above, in the gas circuit breaker according to the present invention, the hot gas passes through the filter, whereby the metal vapor, the metal particles and the compound particles can be removed from the hot gas immediately after the blocking operation. Therefore,
Metal vapor, metal particles, and compound particles creep on insulators,
It is possible to prevent insulation deterioration, open / close failure, and contact failure due to adhesion to the opening / closing operation section and the conductor contact section.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a gas circuit breaker according to the present invention.

FIG. 2 is a diagram showing a structural example of the filter.

[Explanation of symbols]

 1 Fixed Contact 2 Movable Contact 3 Puffer Cylinder 4 Puffer Piston 5 Nozzle 6 Gas Passage Cylinder 7 Filter 8 Hot Gas 9 Arc 10 Closed Container

Claims (1)

[Claims] 1. A closed container in which an insulating gas is filled, a fixed contactor, a movable contactor which moves to and away from the fixed contactor by a reciprocating motion, and a puffer provided integrally with the movable contactor. A cylinder, a puffer piston located in the puffer cylinder for compressing an insulating gas, and a nozzle integrally provided with the movable contactor for guiding the compressed insulating gas and spraying it toward the fixed contactor. In a gas circuit breaker having, a gas passage cylinder forming a passage of an insulating gas blown from the nozzle is provided on an outer peripheral portion of the fixed contact, and a mesh shape is provided between the fixed contact and the gas passage cylinder. A gas filter, characterized in that the metal vapor, the metal particles and the compound particles contained in the insulating gas introduced from the nozzle are removed. .