JPH06309999A - Buffer type breaker - Google Patents

Abstract

PURPOSE:To make even the electric field distribution between electrodes by forming the foremost parts of a movable electrode and stationary electrode spherically, and forming a gas flow path from the movable electrode and an insulation nozzle. CONSTITUTION:A pair of electrodes consisting of a movable electrode 21 and stationary electrode 22 are furnished in a vessel which is filled with an arc extinguishing gas 8, and the foremost parts of these electrodes are formed in a spherical surface having a specified curvature, and the actuating and opening operations are made when these foremost parts contact and separate. Because the electrodes 21, 22 contact in the butted condition to each other when they make the actuating motions, the curvatures of the two are lessened, and the electric field distribution between the electrodes can be made even. A gas flow path 25 for the gas 8 is formed by the electrode 21 and an insulation nozzle 7 arranged as surrounding the foremost part of the electrode 21, and the minimum section area part of the flow path 25 is located near the foremost part of the electrode 21 so that the gas 8 is sent effectively blowing to the arcs, which allows exerting an excellent current breaking ability.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, a puffer type breaking unit has been known as a device for breaking and turning on a large capacity current. The puffer-type cutoff unit compresses the arc-extinguishing gas filled in the container with a piston mechanism consisting of a puffer cylinder and a puffer piston, and injects this compressed arc-extinguishing gas from a nozzle so that the contact between the contacts is interrupted during current interruption. It is to extinguish the arc generated in.

FIG. 3 shows such a puffer type breaking unit.
The one shown in is adopted. In FIG.
(A) shows a closed state, (b) shows an opening state, and (c) shows an open circuit state. That is, the puffer type shutoff unit is housed in a container (not shown) filled with the arc extinguishing gas 8.
In this container, a pair of electrodes composed of a movable electrode 1 and a fixed electrode 2 is provided.

The fixed electrode 2 is fixed to the container side, and the movable electrode 1 is movable in the horizontal direction in the figure.
The electrodes 1 and 2 are adapted to perform a closing operation and an opening operation when the tip portions 11 and 12 contact and separate from each other. The tip 11 on the movable electrode 1 side is formed in a hollow cylindrical shape, and the tip 12 on the fixed electrode 2 side is formed in a rod shape.

An operating rod 3 is fixed to the movable electrode 1. The operation rod 3 is provided so as to be movable in the left-right direction in the drawing. A drive device (not shown) is connected to the operation rod 3. The movable electrode 1 and the operating rod 3 are integrally moved in the left-right direction in the figure by receiving the driving force of the driving device.

The operating rod 3 has a hollow cylindrical cylinder 4
Is attached. Arc extinguishing gas 8 in the cylinder 4.
And a piston 5 is slidably provided. A puffer chamber 6 is composed of the cylinder 4 and the piston 5. An insulating nozzle 7 is provided at the tip of the puffer chamber 6. A predetermined gap is formed between the insulating nozzle 7 and the puffer chamber 6, and a gas flow path R is formed from this gap. The insulating nozzle 7 and the puffer chamber 6 are communicated with each other via the gas flow path R. Further, the insulating nozzle 7 is provided with a throat portion at its tip and is arranged so as to surround the tip portions 11 and 12 of the movable electrode 1 and the fixed electrode 2 which are in contact with each other by the throat portion.

In the puffer type breaker having such a structure, when the current is cut off, it operates as follows. In the closed state shown in FIG. 3A, the tip portion 1 of the movable electrode 1 is
The tip portion 12 of the fixed electrode 2 is inserted in 1. At this time, the piston 5 is located on the right side in the figure.

From this state, when the current is cut off, the operating rod 3 is moved to the right in the figure by a driving device (not shown). Since the operating rod 3, the movable electrode 1, the cylinder 4 and the insulating nozzle 7 are integrally formed, the movable electrode 1 also moves to the right in the figure as the operating rod 3 moves. Thereby, the fixed electrode 2 and the movable electrode 1
And perform opening operation. At this time, an arc 9 is generated between the electrodes 1 and 2 as shown in FIG.

Simultaneously with the opening operation, the piston 5 moves leftward in the figure to compress the arc-extinguishing gas 8 in the puffer chamber 6 constituted by the cylinder 4 and the piston 5.
The compressed arc-extinguishing gas 8 is sent from the puffer chamber 6 through the gas flow path R to the insulating nozzle 7. Then, the arc-extinguishing gas 8 is sprayed onto the arc 9 generated between the electrodes 1 and 2 in the throat portion 7 a of the insulating nozzle 7. By this spraying, the arc 9 is extinguished at the current zero point. Finally, both electrodes 1 and 2 are in the open circuit state shown in FIG. As described above, the puffer type shutoff unit
By blowing the arc-extinguishing gas 8 compressed from the puffer chamber 6 onto the arc 9, a large arc extinguishing ability can be obtained, and an excellent current interruption ability can be exhibited.

[0010]

In order for the puffer type breaker to secure an excellent current breaking ability, the speed and magnitude of insulation recovery between the electrodes after arc extinction must be large. It is known that the speed and magnitude of the insulation recovery between the electrodes increase as the electric field distribution between the electrodes increases. The electric field distribution between the electrodes mainly depends on the shapes of the tips of both electrodes. For example,
In the puffer-type blocking section shown in FIG. 3, the tip of the fixed electrode 2 is rod-shaped, and the tip 12 of the fixed electrode 2 is the tip of the movable electrode 1 when the electrodes 1 and 2 are inserted as shown in (a). It is inserted in the part 11. Therefore, there is a limit in equalizing the electric field distribution between the electrodes 1 and 2.

In order to solve this, it is considered that the tips of the electrodes 1 and 2 are brought into contact with each other by butting to bring them into a closed state. However, in this case, there are the following problems. That is, the arc-extinguishing gas 8 effectively acts on the arc 9 generated between the electrodes 1 and 2 by being sprayed at the minimum cross-sectional area portion of the gas flow path. This minimum cross-sectional area portion is the insulating nozzle 7 in the above-mentioned conventional technology.
It is between the throat portions 7a, 7a. However, in order to bring them into contact by abutting, it is necessary to reduce the curvature of the tips of both electrodes 1 and 2. In this case, it is difficult to configure the minimum cross-sectional area portion of the gas flow path that is effective for extinguishing the arc 9 only by the shape of the insulating nozzle 7. When the blown-out portion of the arc-extinguishing gas does not become the minimum cross-sectional area portion of the gas flow path, or when the blow-off portion which becomes the minimum cross-sectional area portion is separated from the tip of the electrode, the arc-extinguishing gas 8
Cannot be effectively sprayed onto the arc 9. In this case, the speed and size of the insulation recovery between the electrodes 1 and 2 cannot be secured, and a sufficient current interruption capability cannot be obtained.

The present invention has been made in order to solve the above-mentioned problems in the prior art, and an object thereof is to provide a puffer type breaker section which equalizes the electric field distribution between electrodes and has an excellent current cutoff capability. Is to provide.

[0013]

In order to achieve the above object, in the present invention, a pair of electrodes consisting of a movable electrode and a fixed electrode is provided in a container filled with an arc-extinguishing gas, and both electrodes are opened. And an insulating nozzle is arranged so as to be able to come into contact with and separate from each other so as to perform a closing operation, and an insulating nozzle is arranged so as to surround the tips of both electrodes in contact, and the arc extinguishing gas is interlocked with the opening operation of both electrodes. A puffer chamber for compressing the arc-extinguishing gas compressed in the puffer chamber between the electrodes, in a puffer-type blocking section, the tip of the electrodes are spherical with a predetermined curvature. The movable electrode and the insulating nozzle arranged around the movable electrode form a gas flow path through which the arc-extinguishing gas compressed in the puffer chamber passes, and the tip of the gas flow path is defined by the minimum of the gas flow path. Structure so that it becomes the cross-sectional area part And, between the electrodes it is time to take the closing operation, characterized in that the tip portions of the electrodes are configured to contact.

[0014]

In the present invention having the above-described structure, when the movable electrode and the fixed electrode perform the closing operation, the tip ends of the spherical movable electrode and the fixed electrode come into contact with each other in a butted state. Therefore, the curvature of both can be reduced,
It is possible to equalize the electric field distribution between the electrodes. Moreover, a gas flow path for arc-extinguishing gas is formed by the insulating nozzle and the movable electrode arranged so as to surround the tip of the movable electrode, and the minimum cross-sectional area of the gas flow path, which is the tip of the arc extinguishing gas, is movable. The arc-extinguishing gas can be effectively blown to the arc because it is arranged close to the tip of the electrode. Therefore, it becomes a puffer type breaking unit that exhibits excellent current breaking ability.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the puffer type breaker according to the present invention will be described below with reference to the drawings. FIG. 1 shows a closed state of the puffer type breaking unit of the present embodiment (a) is a side sectional view,
2B is a sectional view taken along the line AA in FIG. 2A, and FIG. 2A is a side cross-sectional view showing the contact opening state of the present invention,
(B) is a side sectional view showing an open state of the present invention. It should be noted that members having the same functions as those of the conventional puffer type breaking unit are designated by the same reference numerals and the description thereof is omitted.

As shown in FIG. 1, a pair of electrodes consisting of a movable electrode 21 and a fixed electrode 22 are provided in the container filled with the arc extinguishing gas 8. The both electrodes 21, 22 are formed in a spherical shape with a tip having a predetermined curvature, and are configured to perform the closing operation and the opening operation when the tips contact and separate. When the electrodes 21 and 22 perform the closing operation, the electrodes 21 and 22 are in contact with each other in a butted state.

The base of the movable electrode 21 is fixed to the tip of the operating rod 3. It should be noted that the movable electrode 21 has a base portion having substantially the same diameter as the operating rod 3,
It is formed so as to become thinner from the edge of the spherical tip toward the base.

Further, the tip of the operating rod 3 supports the insulating nozzle 7 arranged at the tip of the puffer chamber 6 via the nozzle support 23. At this time, the insulating nozzle is arranged so as to surround the tips of both electrodes which are in contact with each other. Further, the nozzle support portions 23 are formed in a radial shape, and the space between the nozzle support portions 23 is configured as a gas blowout hole 24. Furthermore, the insulating nozzle 7 and the movable electrode 21 form a gas flow path 25, which is communicated with the puffer chamber 6 through the gas blowout hole 24. The gas flow path 25 is configured such that its cross-sectional area becomes smaller toward the tip end depending on the shape of the movable electrode 21. Further, the tip portion of the gas flow path 25 is located near the tip portion of the movable electrode 21.

On the other hand, the fixed electrode 22 is formed with a stopper 30 projecting to the outer peripheral side at the base thereof. Such a fixed electrode 22 is slidably provided in a hollow cylindrical guide 27 fixed to a wall surface 26 of the container. A spring 28 that biases the fixed electrode 22 toward the movable electrode 21 is housed in the guide 27. Further, a stopper 29 protruding inward is formed at the tip of the guide 27.
The fixed electrode 22 biased by the spring 28 is restricted from moving to the movable electrode 21 side by the electrode side stopper 30 contacting the guide side stopper 29.

When the puffer type breaking unit of the present embodiment configured as described above cuts off current, it operates as follows. That is, in the closed state shown in FIG.
The tip portion 31 of No. 1 and the tip portion 32 of the fixed electrode 22 are in contact with each other in a butted state. At this time, the piston 5 is located on the right side in the drawing, and the pressing force causes the fixed electrode 22 to compress the spring 28 in the guide 27. In such a closed state, current flows through the contact surfaces of both electrodes 21, 22.

When shutting off the current from this state, the operating rod 3 is moved to the right in the figure by a driving device (not shown). Here, since the operating rod 3, the movable electrode 21, the cylinder 4, and the insulating nozzle 7 are integrally formed,
The movable electrode 21 also moves rightward in the figure together with the operation rod 3. As a result, the fixed electrode 22 and the movable electrode 21 perform the separating operation. At this time, a gap between the electrodes 21 and 22 is as shown in FIG.
An arc 9 is generated as shown in (a). Simultaneously with this opening / closing operation, the piston 5 moves to the left in the figure,
The arc extinguishing gas 8 in the puffer chamber 6 formed by the cylinder 4 and the piston 5 is compressed. Due to this compression, the arc-extinguishing gas 8 becomes a gas flow 10 and is sent out from the puffer chamber 6 to the gas flow path 25 through the gas blow-out holes 24 provided between the nozzle support portions 23. Then, from the tip portion, which is the minimum cross-sectional area portion 25a of the gas flow path 25, to the electrodes 21, 2
Spray on the arc 9 generated between the two. By this spraying, the arc 9 is extinguished at the current zero point. Finally, the electrodes 21 and 22 are brought into the open circuit state shown in FIG.

According to this embodiment as described above, when the movable electrode 21 and the fixed electrode 22 perform the closing operation, the tip ends of the spherical electrodes 21 and 22 come into contact with each other in an abutting state, so The curvature can be reduced. Therefore, it becomes possible to equalize the electric field distribution between the electrodes 21 and 22. Therefore, the speed and magnitude of insulation recovery between the electrodes 21 and 22 can be increased, and an excellent current interruption capability can be secured. Further, since the insulation recovery speed between the electrodes 21 and 22 is increased, the distance between the electrodes 21 and 22 and the opening drive speed of the movable electrode 21 can be reduced.

Moreover, the tip portion of the gas passage 25 is arranged so as to be close to the tip portion of the movable electrode 21 where the arc 9 is generated, and the tip portion 25a of the gas passage 25 has a minimum sectional area. Therefore, the arc-extinguishing gas 8 ejected from the tip portion 25a can be effectively sprayed on the arc 9. Therefore, the puffer type breaking unit has an excellent current breaking capability.

The puffer type breaker of the present invention is not limited to the above-mentioned embodiment, and the shape and material of each member or the mounting position and method of each member other than the contact portion are appropriate. It can be changed.

[0025]

As described above, according to the present invention, the tip portions of the movable electrode and the fixed electrode are formed into a spherical surface having a predetermined curvature, and when the movable electrode and the fixed electrode perform the closing operation, both electrodes are By making them contact with each other, it is possible to equalize the electric field distribution between the electrodes and increase the speed and magnitude of insulation recovery between the electrodes. Moreover, the tip portion of the gas passage through which the arc-extinguishing gas compressed in the puffer chamber passes is configured to be the minimum cross-sectional area portion of the gas passage,
Since this is close to the tip of the movable electrode where the arc is generated, the arc-extinguishing gas ejected from this tip can be effectively blown to the arc. Therefore, it is possible to provide a puffer type breaking unit having an excellent current breaking ability.

[Brief description of drawings]

1A and 1B show a closed state of a puffer type shutoff unit according to an embodiment of the present invention, FIG. 1A is a side sectional view, and FIG.

2 (a) is a side sectional view showing an open state of FIG. 1 and FIG. 2 (b) is a side sectional view showing an open state of FIG.

FIG. 3 is a cross-sectional view showing a conventional puffer type breaking unit,
(A) is a closed state, (b) is an open state, and (c) is an open state.

[Explanation of symbols]

 1, 21 ... Movable electrode 2, 22 ... Fixed electrode 3 ... Operation rod 4 ... Cylinder 5 ... Piston 6 ... Puffer chamber 7 ... Insulation nozzle 7a ... Throat part 8 ... Arc extinguishing gas 9 ... Arc 10 ... Gas flow 11, 31 ... Tip part of movable electrode 12, 32 ... Tip part of fixed electrode 23 ... Nozzle support part 24 ... Gas blow-out hole 25 ... Gas flow path 25a ... Tip part of gas flow path (minimum cross-sectional area part) 26 ... Wall surface 27 of container ... Guide 28 ... Spring 29 ... Guide side stopper 30 ... Fixed electrode side stopper

Claims (1)

[Claims] 1. A pair of electrodes consisting of a movable electrode and a fixed electrode are provided in a container filled with an arc-extinguishing gas, and both electrodes are configured to be contactable and separable so as to perform a separating operation and a closing operation, and further contacted. An insulating nozzle is arranged so as to surround the tips of both electrodes, and a puffer chamber that compresses the arc-extinguishing gas in conjunction with the opening operation of the electrodes is provided. In a puffer-type cutoff portion configured to blow an arc gas between the electrodes, the tip portions of the electrodes are formed into a spherical surface having a predetermined curvature, and the movable electrode and an insulating nozzle arranged around the movable electrode A gas flow passage through which the arc-extinguishing gas compressed in the puffer chamber passes is configured, and the tip end portion of the gas flow passage is configured to be the minimum cross-sectional area portion of the gas flow passage, and the both electrodes are closed. When removing, the tips of both electrodes Puffer type interrupting unit, characterized by being configured to contact.