JP2000011819A - Gas-blast circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-blast circuit breaker capable of providing an arc driving force without damaging an arc runner. SOLUTION: This gas-blast circuit breaker is provided with a vessel 1 sealing an arc-extinguishing gas 10, a fixed electrode 4 having a fixed contact 5 mounted on the vessel 1, a movable electrode 2 having a movable contact 3 mounted on the vessel 1, a cylinder 6 consisting of a conductive material, having a protruding part 7 protruded inward in the middle part, and mounted on the fixed electrode 4, an arc runner 8 consisting of a carbon material mounted on the protruding part 7 of the cylinder 6, and an arc driving coil 9 wound on the circumference of the cylinder 6 and having one end connected to the fixed electrode 4 and the other end connected to the arc runner 8. In this case, one end of the arc runner 8 consisting of the carbon material is engagingly locked by the protruding piece of the protruding part 7 of the cylinder 6, and extended along the protruding part 7 of the cylinder 6, and the upper end is fixed to the cylinder 6 by a pressing metal fitting 8a. Accordingly, an arc driving force can be generated in the arc driving coil 9 without damaging the arc runner 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a gas circuit breaker for extinguishing an arc in an arc-extinguishing gas.

[0002]

2. Description of the Related Art A conventional gas circuit breaker is constructed as shown in FIGS. In the figure, reference numeral 20 denotes a container made of an insulating material, and a movable electrode 21 is fixed to the top of the container 20. Reference numeral 22 denotes a movable contact that is attached so as to slide on the movable electrode 21. Reference numeral 23 denotes a fixed electrode provided at the bottom of the container 20, and a fixed contact 24
Is installed. Reference numeral 25 denotes a cylindrical body formed of a conductive material in a cylindrical shape. The cylindrical body 25
As shown in FIG.
Is provided. Reference numeral 27 denotes an arc runner made of carbon material, which is provided with a thread groove 27a on the outer periphery thereof.
Is screwed into the screw groove 26a of the projection 26. Reference numeral 28 denotes an arc drive coil wound around the outer periphery of the cylindrical body 25, one end of which is connected to the fixed electrode 23 and the other end of which is the arc runner 27.
Connected to. An insulating resin 29 covers the arc drive coil 28 and fills the protruding portion 26 of the cylindrical body 25.
Reference numeral 30 denotes an arc-extinguishing gas sealed in the container 20. Next, the switching operation of the gas circuit breaker thus configured will be described. FIG. 4 shows a state where the gas circuit breaker is open. In this state, when the movable contact 22 is operated in the direction of arrow B by an operation mechanism (not shown), the movable contact 22 slides on the movable electrode 21 and contacts the fixed contact 24, thereby closing the electric circuit. When the movable contact 22 is operated in a direction opposite to the direction of arrow B by an operating mechanism (not shown) from a state where the electric circuit is closed, the movable contact 22 is separated from the fixed contact 24 and fixedly contacts the movable contact 22. An arc is generated with the child 24. Further, when the movable contact 22 is operated in the direction opposite to the direction of the arrow B, the arc foot on the fixed contact 24 moves onto the arc runner 27. Arc feet are arc runner 2
7, the arc current flows from the movable electrode 21 through the movable contact 22 to the arc runner 27 from the atmosphere of the arc-extinguishing gas 30. The arc current flowing through the arcrunner 27 flows from the arc drive coil 28 to the fixed electrode 23. When the arc current flows through the arc driving coil 28, a magnetic flux is generated in the arc driving coil 28. With this magnetic flux, the arc between the arc runner 27 and the movable contact 22 is driven to rotate in the atmosphere of the arc-extinguishing gas 30 to extinguish the arc.

However, the arc runner 27 is made of carbon material, and the screw groove 27a provided on the outer periphery of the arc runner 27 is screwed into the screw groove 26a of the projection 26 of the cylindrical body 25 to form the arc runner 27. Cylindrical body 2
5, the protrusion 26 of the cylindrical body 25 expands due to arc heat, and the screw groove 2 of the arc runner 27 made of carbon material screwed into the screw groove 26a.
7a is stressed, and the thread groove 27a of the arc runner 27 is
And the arc current does not flow from the arc runner 27 to the cylindrical body 25, so that there is a problem that an arc driving force cannot be obtained. Therefore, an object of the present invention is to provide a gas circuit breaker that can obtain an arc driving force without damaging an arc runner.

[0003]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a container filled with an arc-extinguishing gas, a fixed electrode having a fixed contact mounted on the container, and a movable electrode mounted on the container. A movable electrode having a contact, a cylindrical body attached to the fixed electrode comprising a projection made of a conductive material and having an intermediate portion projecting inward, and an arc runner made of a carbon material attached to the projection of the cylinder; A gas circuit breaker having an arc drive coil wound around the cylindrical body and having one end connected to the fixed electrode and the other end connected to the arc runner; An arc runner made of a carbon material that is locked and expanded along the protruding portion of the cylindrical body and whose upper end is fixed to the cylindrical body with a holding metal fitting.

[0004]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of a gas circuit breaker showing a first embodiment of the present invention, and FIG. 2 is an enlarged side sectional view of a main part. In the figure, reference numeral 1 denotes a container made of an insulating material, and a movable electrode 2 is fixed to the top of the container 1. Reference numeral 3 denotes a movable contact that is mounted so as to slide on the movable electrode 2. 4
Is a fixed electrode provided on the bottom of the container 1, and a fixed contact 5 is attached to the fixed electrode 4. Reference numeral 6 denotes a cylindrical body made of a conductive material and attached to the fixed electrode 4, and has a protruding portion 7 protruding inward. The cylindrical body 6 has an insulating material 6a interposed between an upper cylindrical member 6b and a lower cylindrical member 6c, and electrically insulates the cylindrical member 6b from the cylindrical member 6c. Reference numeral 7a denotes a projecting piece formed on the projecting portion 7 of the cylindrical body 6. Reference numeral 8 denotes an arc runner made of a carbon material that is expanded above the projecting piece 7a of the projecting portion 7 of the cylindrical body 6. The upper end of the arc runner 8 is pressed by a holding member 8a attached to the cylindrical body 6, and the arc runner 8 is fixed by being sandwiched between the protrusion piece 7a. Reference numeral 9 denotes an arc drive coil wound around the outer periphery of the cylindrical body 6, one end of which is connected to the fixed electrode 4, and the other end of which is connected to the arc runner 8. 10
Is an insulating resin that covers the arc drive coil 9 and fills the inside of the protrusion 7 of the cylindrical body 6. Numeral 11 denotes an arc-extinguishing gas sealed in a container. Next, the switching operation of the gas circuit breaker thus configured will be described. FIG. 1 shows a state in which the gas circuit breaker is open. When the movable contact 3 is actuated in the direction of arrow A by operating an operation mechanism (not shown) from this state, the movable contact 3 is brought into fixed contact. The electric circuit is closed by contacting the child 5. When the movable contact 3 is operated in the direction opposite to the direction of arrow A from this state, the movable contact 3 is separated from the fixed contact 5 and an arc is generated between the movable contact 3 and the fixed contact 5. Further, when the movable contact 3 is operated in the direction opposite to the direction of the arrow A, the arc foot on the fixed contact 5 moves onto the arc runner 8. The arc current at this time flows from the movable contact 3 through the arc-extinguishing gas 11 to the arc runner 8. The arc current flowing through the arcrunner 8 flows through the arc driving coil 9 to the fixed electrode 4. The arc drive coil 9 is driven by an arc current flowing through the arc drive coil 9.
Generates magnetic flux. The magnetic flux causes the arc between the movable contact 3 and the arc runner 8 to rotate in an arc-extinguishing gas atmosphere to guide the arc to arc extinction. In this case, Arc Runner 8
Is fixed by the protruding piece 7a provided on the protruding portion 7 of the cylindrical body 6 and the presser fitting 8a attached to the cylindrical body 6, so that the arc runner 8 causes the stress caused by the thermal expansion of the cylindrical body 6 due to the arc heat. As a result, the arc runner 8 is not damaged. FIG. 3 shows a second embodiment of the present invention, in which an arc runner 8 is expanded along a projection 7 of the cylindrical body 6.
A flange 8b is provided at the upper end of the cylindrical body 6, and the flange 8b is fixed to the upper end of the cylindrical body 6 by screwing. Therefore, the arc runner 8 does not receive the stress due to the thermal expansion of the cylindrical body 6 due to the arc heat, so that the arc runner 8 is not damaged.

[0005]

As described above, according to the present invention, no thread groove is provided in the arc runner itself, so that the arc runner is not damaged and an arc driving force can be generated in the arc driving coil.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a gas circuit breaker showing a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the gas circuit breaker according to the first embodiment of the present invention.

FIG. 3 is an enlarged sectional view of a main part of a gas circuit breaker according to a second embodiment of the present invention.

FIG. 4 is a side sectional view of a conventional gas circuit breaker.

FIG. 5 is an enlarged sectional view of a main part of a conventional gas circuit breaker.

[Explanation of symbols]

1 container, 2 movable electrode, 3 movable contact, 4
Fixed electrode, 5 Fixed contact, 6 Cylindrical body, 6a Insulating material, 6b, 6c Cylindrical member, 7 Projection, 7a
Projection piece, 8 arcrunner, 8a Holder, 8b
Flange, 9 Arc drive coil, 10 Arc extinguishing gas

Claims (2)

[Claims] 1. A container in which an arc-extinguishing gas is sealed, a fixed electrode having a fixed contact attached to the container, a movable electrode having a movable contact attached to the container, and an intermediate portion made of a conductive material and having an intermediate portion inside. A cylindrical body provided with a protruding portion protruding from the cylindrical body, and an arc runner made of carbon material mounted on the protruding portion of the cylindrical body; and an end wound around the cylindrical body and connected to the fixed electrode at one end. And an arc drive coil having the other end connected to the arc runner, wherein one end of the gas circuit breaker is engaged with the projecting piece of the projecting portion of the cylindrical body, and is expanded along the projecting portion of the cylindrical body. A gas circuit breaker comprising an arc runner made of a carbon material having an upper end fixed to a cylindrical body with a holding bracket. 2. A container filled with an arc-extinguishing gas, a fixed electrode having a fixed contact attached to the container, a movable electrode having a movable contact attached to the container, and an intermediate portion made of a conductive material. A cylindrical body provided with a protruding portion protruding from the cylindrical body, and an arc runner made of carbon material mounted on the protruding portion of the cylindrical body; and an end wound around the cylindrical body and connected to the fixed electrode at one end. And an arc drive coil having the other end connected to the arc runner, wherein a flange is provided at an upper end of the arc runner expanded along a protrusion of the cylindrical body, and the flange is provided on the cylindrical body. A gas circuit breaker fixed to the upper end with screws.