JPH10312729A - Rotary arc gas circuit-breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary arc gas circuit-breaker that can surely extinguish an arc. SOLUTION: This gas circuit-breaker is provided with a fixed electrode 1 inside a sealed vessel, a fixed contactor 3 provided with the fixed electrode 1, a moving electrode 4 supported so as to be contacted/separated to/from the fixed electrode, an arc contactor 5 provided at the tip part of the moving electrode 4, an arc runner 7 supported to the fixed electrode 1 through an insulating material 7a, and an arc drive coil 8 wound on a peripheral surface of the arc runner 7 are provided within the vessel. In this case, at least a part of the arc runner 7 is expanded from the fixed electrode 1 side to the moving electrode 4 side, and the arc drive coil 8 is wound on at least the expanded part of the arc runner 7. Therefore, an arc rotation speed becomes fast, and the arc can be surely extinguished.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a movable electrode and a fixed electrode disposed in a container, and an arc runner having an arc driving coil on the outer periphery surrounding the fixed electrode is supported by the fixed electrode via an insulating material. The present invention relates to a rotating arc type gas circuit breaker.

[0002]

2. Description of the Related Art A conventional rotary arc type gas circuit breaker for extinguishing an arc in a stationary gas atmosphere is configured as shown in FIG. In the figure, reference numeral 30 denotes a fixed electrode.
, A fixed contact 32 is attached via a spring 31. 3
Reference numeral 3 denotes an annular auxiliary electrode that covers the fixed contact 32, and is electrically connected to the fixed electrode 30 and attached thereto. A movable electrode 34 is provided with an arc contact 35 at the tip. 36 is a cylindrical body made of a conductive material,
Are arranged via an insulator. 37 is the cylindrical body 36
Are protruded toward the contact portion between the fixed contact 32 and the arc contact 35. 3
Reference numeral 8 denotes an arc drive coil wound around the outer periphery of the cylindrical body 36, one end of which is connected to the cylindrical body 36, and the other end of which is a fixed electrode 3
Connected to 0. Reference numeral 39 denotes an arc between the arc runner 37 and the auxiliary electrode 33, and reference numeral 40 denotes an arc between the arc contact 35 of the movable electrode 34 and the arc runner 37. 41
Is a sealed container that houses the fixed electrode 30, the movable electrode 34, and the cylindrical body 36 together with the arc-extinguishing gas. Next, the opening operation of the rotary arc type gas circuit breaker having such a configuration will be described. When the movable electrode 34 is operated downward, the movable electrode 34 is separated from the fixed contact 32 of the fixed electrode 30, and an arc is generated between the arc contact 35 of the movable electrode 34 and the fixed contact 32. Further, when the movable electrode 34 is operated downward, the arc generated between the arc contact 35 of the movable electrode 34 and the fixed contact 32 shifts on the arc runner 37. Arc is Arc Runner 37
Is transferred to the arc contact 3 of the movable electrode 34.
5 is generated between the arc runner 37 and the auxiliary electrode 33.
9 occurs. The arc current at this time is
From the arc contactor 35 in the arc extinguishing gas atmosphere
0, the flow from the arc runner 37 to the fixed electrode 30 through the arc drive coil 38, and the arc runner 37.
The auxiliary electrode 3 passes through the arc 39 in a more arc-extinguishing gas atmosphere.
3 flows to the fixed electrode 30. A magnetic flux is generated in the arc driving coil 38 by the arc current flowing through the arc driving coil 38. This arc drive coil 38
The arc 40 between the arc contact 35 and the arc runner 37 and the arc 39 between the arc runner 37 and the auxiliary electrode 33 are rotationally driven by the magnetic flux generated in the step (1) to extinguish the arc.

[0003]

However, the conventional rotary arc type gas circuit breaker has the following problems. (1) Since the magnetic flux generated from the arc driving coil 38 is generated vertically along the inner peripheral surface of the arc driving coil 38, the arc 3 between the arc runner 37 and the auxiliary electrode 33 is generated.
9 is not orthogonal to the magnetic flux generated in the arc drive coil 38. The arc 40 between the arc runner 37 and the arc contact 35 is formed by the arc contact 35
When the movable electrode 34 operates downward, the arc 40 and the magnetic flux of the arc drive coil 38 become parallel and no longer orthogonal. For this reason, the rotation speed of the arcs 39 and 40 decreases, and the driving force for rotating the arcs decreases, so that the arc cannot be sufficiently cooled and cannot be extinguished. (2) The arc is the auxiliary electrode 33 and the arc runner 3
7 and the rotation speed of the upper surface of the arc contact 35 is low,
Due to the arc heat, the arc contact 35 made of, for example, a copper-tungsten alloy causes local evaporation of copper, and metal vapor is scattered in the arc-extinguishing gas atmosphere, making it difficult to extinguish the arc. Due to the scattering of copper, projections of tungsten are formed on the surface of the arc contact 35, and the electric field is concentrated, causing dielectric breakdown and extinguishing the arc. Accordingly, an object of the present invention is to provide a rotary arc gas circuit breaker capable of reliably extinguishing an arc.

[0004]

According to a first aspect of the present invention, there is provided a fixed electrode fixed in a closed container, a fixed contact provided on the fixed electrode, Inside, a movable electrode supported so as to be able to contact and separate from the fixed electrode, an arc contact provided at a tip end of the movable electrode, an arc runner supported on the fixed electrode via an insulating material, and an outer periphery of the arc runner. In a rotary arc type gas circuit breaker having an arc drive coil wound on a surface, at least a part of the arc runner is expanded from a fixed electrode side to a movable electrode side, and the arc drive coil is expanded at least in the arc runner. It is wound around the outer peripheral surface of the opened portion. A second invention provides a pressure-boosting chamber and a pressure-releasing chamber that are provided by partitioning the inside of a sealed container with a partition.
A fixed electrode fixed in the boosting chamber, a fixed contact provided on the fixed electrode, a hollow movable electrode supported inside the container so as to be able to contact and separate from the fixed electrode, and provided at a tip of the movable electrode. A rotating arc type gas circuit breaker comprising an arc contact, an arc runner supported on the fixed electrode via an insulating material, and an arc driving coil wound on an outer peripheral surface of the arc runner, wherein at least a part of the arc runner is provided. Is expanded from the fixed electrode side to the movable electrode side, and the arc driving coil is wound around at least the outer peripheral surface of the expanded part of the arc runner.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. FIG. 1 is a side sectional view of a rotary arc type gas circuit breaker for extinguishing an arc in a stationary gas atmosphere according to a first embodiment of the present invention. In the figure, reference numeral 1 denotes a fixed electrode fixed inside a sealed container (not shown), and a fixed contact 3 is attached to the fixed electrode 1 via a spring 2. 4
Is a movable electrode which is supported inside the container so as to be able to contact and separate from the fixed electrode 1, and an arc contact 5 is provided at the tip. Reference numeral 6 denotes an auxiliary electrode that covers the fixed contact 3 and is electrically connected to the fixed electrode 1. Reference numeral 7 denotes an arc runner which is expanded from the fixed electrode 1 side to the movable electrode 4 side, and is attached to the fixed electrode 1 via an insulating material 7a. Numeral 8 denotes an arc driving coil wound around the expanded portion of the arc runner 7, one end of which is connected to the arc runner 7, and the other end of which is connected to the fixed electrode 1. An insulating resin 9 covers the arc driving coil 8 and fixes the arc driving coil 8 to the arc runner 7. The fixed electrode 1, the movable electrode 4, and the arc runner 7 configured as described above are housed in a container (not shown) together with the arc-extinguishing gas. The arc runner 7 may be provided with a cylindrical portion at the upper end, and may be expanded from the cylindrical portion toward the movable electrode 4. Next, the opening operation of the rotary arc type gas circuit breaker having such a configuration will be described. When the movable electrode 4 is driven downward (opposite the fixed electrode side) by an operation mechanism (not shown) from a closed state (not shown) in which the arc contact 5 contacts the fixed contact 5,
The arc contact 5 of the movable electrode 4 is separated from the fixed contact 3 of the fixed electrode 1, and an arc is generated between the arc contact 5 and the fixed contact 3. Further, when the movable electrode 4 is operated downward, the arc generated between the arc contact 5 and the fixed contact 3 is transferred to the arc runner 7. When this arc shifts to the arc runner 7, the arc forms an arc 10 between the auxiliary electrode 6 and the arc runner 7 as shown in FIG.
It is divided into an arc 11 between the arc runner 7 and the arc contact 5. The arc current at this time flows from the arc contact 5 of the movable electrode 4 to the arc runner 7 via the arc 11 in the arc-extinguishing gas atmosphere. One flowing from the arc runner 7 to the fixed electrode 1 via the arc driving coil 8;
The arc flows from the arc electrode 7 to the fixed electrode 4 from the auxiliary electrode 6 through the arc 10 in the arc-extinguishing gas atmosphere. Therefore, the magnetic flux Φ1 is generated by the arc current flowing through the arc driving coil 8. The magnetic flux Φ1 generated by the arc driving coil 8 is distributed between the end of the arc runner 7 and the auxiliary electrode 6 along the truncated conical surface of the arc runner 7. Therefore, the magnetic flux of the arc driving coil 8 causes the arc 1 between the arc contact 5 and the arc runner 7 to move.
1 and arc 1 between arc runner 7 and auxiliary electrode 6
It is orthogonal to 0. FIG. 2 is a diagram showing the relationship between the arcs 10, 11 according to the first embodiment of the present invention and the orthogonality ratio between the arcs 39, 40 of the conventional example and the magnetic flux of the arc driving coil. Taking the orthogonality ratio between 39 and 40 and the magnetic flux, the horizontal axis indicates the moving position of the movable electrode from the closed position to the fully opened position of the movable electrode. In the conventional arc 40, the magnetic flux is orthogonal to the arc 40 at a rate of about 100% immediately after the arc has shifted to the arc runner 37 as shown by a curve B. After that, it decreased rapidly, and reached about 2 at the fully open position.
The orthogonality ratio between the arc and the magnetic flux is reduced to 0%.
Further, the orthogonality ratio of the arc 39 between the arc runner 37 and the auxiliary electrode 33 is as low as about 2% as shown by the straight line B 'regardless of the moving position of the movable electrode 34.
On the other hand, the arc 11 of the present invention has about 100 at the time when the arc is transferred to the arc runner as shown by the curve A.
% Of the magnetic flux is orthogonal to the arc 11. Thereafter, even if the movable electrode 4 reaches the fully opened position, the orthogonality between the arc 11 and the magnetic flux Φ1 is maintained at a rate of about 40%. Further, the orthogonality ratio of the arc 10 between the arc runner 7 and the auxiliary electrode 6 is about 40% as shown by the curve A ', which is much higher than the conventional one. Therefore, arc 1
The orthogonality ratio between 0 and 11 and the magnetic flux Φ1 increases, and the force driving the arc increases. As a result, the arc 11 between the arc runner 7 and the arc contact 5 and the arc 10 between the arc runner 7 and the auxiliary electrode 6 can be driven to rotate at a high speed, and the contact with the arc-extinguishing gas is increased. As a result, the arc can be effectively cooled to extinguish the arc reliably. FIG. 3 is a side sectional view showing a rotary arc type gas circuit breaker for extinguishing an arc in a still gas atmosphere according to a second embodiment of the present invention, which is formed in a hollow disk shape and the movable electrode 4 side is expanded. The arc runner 12 is provided, and the arc driving coil 8 is wound around the outer peripheral surface of the arc runner 12. Hereinafter, the opening operation of the rotary arc type gas circuit breaker having such a configuration will be described. When the movable electrode 4 is driven downward by an operation mechanism (not shown), the arc contact 5 is separated from the fixed contact 3 of the fixed electrode 1, and an arc is generated between the arc contact 5 and the fixed contact 3. Further, when the movable electrode 4 is operated downward, the arc generated between the arc contact 5 and the fixed contact 3 is transferred to the arc runner 12. When the arc moves to the arc runner 12, the arc is split into an arc 10 between the auxiliary electrode 6 and the arc runner 12, and an arc 11 between the arc runner 12 and the arc contact 5. When the arc current at this time flows through the arc drive coil 8, the magnetic flux Φ2
Occurs. Magnetic flux Φ generated in this arc drive coil 8
Numeral 2 greatly expands in the radial direction from the inner end of the arc driving coil 8, and the magnetic flux perpendicular to the arc increases. Therefore, the driving force for driving the arc increases. FIG. 4 is a side sectional view of a rotary arc type gas extinguishing in a stationary gas atmosphere according to a third embodiment of the present invention. An arc runner 13 having an arc-shaped cross section is provided.
An arc drive coil 8 is wound around the outer periphery of the coil 3.
Hereinafter, the opening operation of the rotary arc type gas circuit breaker having such a configuration will be described. When the movable electrode 4 is driven downward by an operation mechanism (not shown), the arc contact 5 is separated from the fixed contact 3 of the fixed electrode 1, and an arc is generated between the arc contact 5 and the fixed contact 3. Further, when the movable electrode 4 is operated downward, the arc generated between the arc contact 5 and the fixed contact 3 is transferred to the arc runner 13. When this arc moves to the arc runner 13,
The arc is divided into an arc 10 between the auxiliary electrode 6 and the arc runner 13 and an arc 11 between the arc runner 13 and the arc contact 5. When the arc current at this time flows through the arc driving coil 8, a magnetic flux Φ3 is generated in the arc driving coil 8. The magnetic flux Φ3 generated in the arc driving coil 8 greatly expands in the radial direction from the inner end of the arc driving coil 8, and the magnetic flux perpendicular to the arc increases. Therefore, the driving force for driving the arc increases.
FIG. 5 shows a fourth embodiment of the present invention, which is applied to a thermal expansion spraying type rotary arc type gas circuit breaker in which an arc-extinguishing gas is blown onto a rotating arc to extinguish the arc.
In the figure, reference numeral 14 denotes a container.
Is installed. Reference numeral 15 denotes a partition provided in the container 14, and the partition 15 divides the inside of the container 14 into a pressure increasing chamber 16 and a pressure releasing chamber 17. Reference numeral 18 denotes a movable electrode which is supported by the partition 15 via a slider 19, is formed in a hollow shape, and has an arc contact 20 at its tip. A valve (not shown) is provided on a cylindrical portion of the movable electrode 18 located in the pressure release chamber 17. 21 is an external terminal. Less than,
The opening operation of the thermal expansion blowing type rotary arc gas circuit breaker having such a configuration will be described. From a closed state (not shown) in which the arc contact 5 and the fixed contact 3 are in contact with each other,
When an operation mechanism (not shown) of the thermal expansion spraying type rotary arc type gas circuit breaker is operated, the movable electrode 18 operates downward. When the movable electrode 18 operates downward, the movable electrode 18
An arc is generated between the arc contact 20 and the fixed contact 3. This arc causes the arc-extinguishing gas in the pressurizing chamber 16 to be heated and expanded to increase the gas pressure. Further, when the movable electrode 18 is operated downward, the arc generated between the arc contact 20 of the movable electrode 18 and the fixed contact 3 moves to the arc runner 7. When the arc moves to the arc runner 7, the arc is divided into an arc 10 between the auxiliary electrode 6 and the arc runner 7, and an arc 11 between the arc runner 7 and the arc contact 20, as shown in FIG. The arc current at this time is the arc contact 2 of the movable electrode 18.
From 0, the arc reaches the arc runner 7 through the arc 11 in the arc-extinguishing gas atmosphere. The arc current from the arc runner 7 flows through the arc drive coil 8 to the fixed electrode 1 and the arc current flows from the arc 10 in the arc-extinguishing gas atmosphere through the arc runner 7 to the fixed electrode 1 through the auxiliary electrode 6. And A magnetic flux is generated in the arc driving coil 8 by the arc current flowing through the arc driving coil 8. The magnetic flux Φ 4 generated in the arc driving coil 8 is orthogonal to the arc 10 between the arc runner 7 and the auxiliary electrode 6 and the arc 11 between the arc runner 7 and the arc contact 21. Therefore, the arc 10 between the auxiliary electrode 6 and the arc runner 7 and the arc 11 between the arc runner 7 and the arc contact 20 of the movable electrode 18 are rotationally driven in an arc-extinguishing gas atmosphere. When the arcs 10 and 11 rotate, the arc-extinguishing gas in the pressurizing chamber 16 expands and the gas pressure increases.
Further, when the movable electrode 18 moves downward, a valve (not shown) provided on the movable electrode 1 is opened, and the arc-extinguishing gas in the boosting chamber 16 passes through the hollow portion of the movable electrode 18 and is discharged into the pressure-releasing chamber 17. Gas flows, and the arc 11 between the arc contact 20 and the arc runner 7 is cooled and extinguished by the flow of the arc-extinguishing gas. Therefore, the cooling effect of the arc by blowing the arc-extinguishing gas by thermal expansion and the cooling of the arc by contact with the arc-extinguishing gas by the rotation drive can improve the arc cooling effect and obtain excellent arc-extinguishing force. it can.

[0006]

As described above, according to the present invention, the following effects can be obtained. (1) Since the magnetic flux of the arc drive coil acting on the arc increases, the arc is rotated at high speed to cool the arc,
The arc can be reliably extinguished. (2) Since the arc does not stay at one location on the arc contact or the arc runner, the generation of metal vapor from the arc contact or the arc runner is suppressed, and the arc is easily extinguished. (3) Since the arc on the arc contact is driven, the generation of metal vapor from the arc contact is suppressed, and the protrusion of tungsten on the arc contact is eliminated. Therefore, the electric field concentration between the arc contact and the arc runner is eliminated, and the dielectric breakdown does not occur, so that the arc can be surely extinguished.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an open state of a rotary arc type gas circuit breaker according to a first embodiment of the present invention.

FIG. 2 is a diagram showing the relationship between the orthogonality of the arc and the magnetic flux at the position of the arc contact in the rotary arc type gas circuit breaker of the present invention and the conventional example.

FIG. 3 is a side sectional view showing an open state of a rotary arc type gas circuit breaker according to a second embodiment of the present invention.

FIG. 4 is a side sectional view showing an open state of a rotary arc type gas circuit breaker according to a third embodiment of the present invention.

FIG. 5 is a side sectional view showing an open state of a rotary arc type gas circuit breaker according to a fourth embodiment of the present invention.

FIG. 6 is a side sectional view showing an open state of a conventional rotary arc type gas circuit breaker.

[Explanation of symbols]

1 fixed electrode, 2 spring, 3 fixed contact, 4
Movable electrode, 5 arc contact, 6 auxiliary electrode, 7
Arcrunner, 7a insulating material, 8 arc drive coil, 9 insulating resin, 10, 11 arc

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Motomichi Oto 2-1 Kurosaki Castle Stone, Yawatanishi-ku, Kitakyushu-shi, Fukuoka Prefecture Inside Yaskawa Electric Corporation

Claims (2)

[Claims] 1. A fixed electrode (1) fixed inside a closed container, a fixed contact (3) provided on the fixed electrode (1), and a fixed electrode (1) inside the container. A movable electrode (4) supported so as to be able to come in contact with and separate from an arc, an arc contact (5) provided at the tip of the movable electrode (4), and a support on the fixed electrode (1) via an insulating material (7a). A rotary arc type gas circuit breaker comprising an arc runner (7) as described above and an arc drive coil (8) wound on the outer peripheral surface of the arc runner (7). While expanding from the 1) side to the movable electrode (4) side,
A rotary arc type gas circuit breaker, wherein the arc driving coil (8) is wound around at least an outer peripheral surface of an expanded portion of the arc runner (7). 2. The inside of a sealed container (14) is partitioned by a partition (1).
5) The pressure raising chamber (16) and the pressure release chamber (1)
7), a fixed electrode (1) fixed in the boosting chamber (16), a fixed contact (3) provided on the fixed electrode (1), and a detachable contact with the fixed electrode (1). A hollow movable electrode (18) supported inside the container, an arc contact (20) provided at a tip of the movable electrode (18),
A rotary arc type gas interrupter comprising: an arc runner (7) supported on the fixed electrode (1) via an insulating material (7a); and an arc drive coil (8) wound on the outer peripheral surface of the arc runner (7). In the vessel, at least a part of the arc runner (7) is expanded from the fixed electrode (1) side to the movable electrode (18) side, and the arc driving coil (8) is expanded at least the arc runner (7). A rotary arc type gas circuit breaker, which is wound around an outer peripheral surface of a bent portion. [0001]