JPH0218825A - Gas-blast circuit-breaker - Google Patents

Abstract

PURPOSE:To obtain a small-sized gas-blast circuit-breaker and reduce the occurrence of a shock force by making the action direction of a movable portion and the action direction of a driving device opposite to each other via a link mechanism. CONSTITUTION:A hydraulic action cylinder in a driving device 16 is lowered according to an insertion command. The second connecting rod 19 connected to the driving device 16 is thereby lowered. When the second connecting rod 19 is lowered, the second connecting rod 19 side end section of a link mechanism 20 is lowered, the link mechanism 20 is rotated counterclockwise. When the link mechanism 20 is rotated, the first connecting rod 18 connected to the other end section of the link mechanism 20 is lifted. A movable section 4 is lifted together with an insulating rod 17 into contact with a fixed section 3 to be electrically connected to it, thus the insertion action is completed. The shock force of the movable section and the shock force of the driving device generated at the time of the action can be offset, the shock force applied to a mechanism box can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a gas circuit breaker in which the impact force of a movable part is reduced.

(Prior Art) Generally, a gas insulated switchgear is configured by connecting a gas circuit breaker, a disconnector, etc. Gas circuit breakers, which are the main equipment of gas-insulated switchgear, are becoming larger and more numerous as the demand for electricity increases.

On the other hand, due to constraints on installation area, etc., there is a demand for downsizing of gas circuit breakers.

Such a conventional gas circuit breaker has a configuration as shown in FIG. That is, an arc extinguishing chamber 2 is placed in a container 1 filled with insulating gas.
is stored. The arc extinguishing chamber 2 includes a fixed part 3 and a movable part 4 which are arranged opposite to each other.

The fixed part 3 has a fixed electrode 5. The movable part 4 is a movable electrode 6
, an insulating nozzle 7, and a buffer cylinder 8, respectively.

Further, the arc extinguishing chamber 2 is fixedly established at the bottom of the container 1. Furthermore, conductors 9 and IO are connected to the upper and lower sides of the arc extinguishing chamber 2, which are led out from openings la and lb provided on the side of the container 1.

The container 1 is placed on a mechanism box 11 placed at the bottom. A drive device 12 such as a hydraulic operation cylinder is housed within this mechanism box 11. Further, the movable part 4 and the drive device 12 are linearly connected via an insulating rod 13 and a connecting rod 14. Then, by operating the drive device 12, the driving force is applied to the insulating rod 13 and the connecting rod 1.
The signal is transmitted to the movable part 4 via the cable 4, and the movable part 4 is operated.

As a result, the fixed part 3 and the movable part 4 are brought into contact with and separated from each other, and an opening/closing operation is performed.

By the way, as the breaking capacity of gas circuit breakers increases, high-speed breaking is required. As a result, large impact forces are generated at the start and end of the operation. This impact force increases in proportion to the mass and acceleration of the moving part.

Moreover, when the movable part 4, the insulating rod 13, the connecting rod 14, and the drive device 12 are linearly connected as in a conventional gas circuit breaker, the impact force due to each operation acts in the same direction. Therefore, the total impact force F□ becomes even larger.

Therefore, it is necessary to improve the strength of the mechanism box 11, which corresponds to the legs of the gas circuit breaker, by attaching beams or the like. As a result, the disadvantage is that the gas circuit breaker becomes larger and heavier. Furthermore, in order to prevent the impact force caused by the gas circuit breaker from being transmitted to nearby equipment, it is necessary to increase the strength of foundations, buildings, etc., or to install special impact force absorbing devices.

(Problems to be Solved by the Invention) As described above, in the conventional gas circuit breaker, the movable parts are connected linearly.

Therefore, the impact force due to the movement of each movable part acts in the same direction, and a large impact force is generated on the gas circuit breaker. As a result, the gas circuit breaker becomes larger and needs to be provided with means for preventing transmission to nearby devices.

The present invention has been made in consideration of the above points, and an object of the present invention is to provide a gas circuit breaker that is small in size and reduces generation of impact force.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, in the present invention, the operating direction of the movable part and the operating direction of the drive device are reversed via a link mechanism.

(Function) With this configuration, it is possible to cancel out the impact force caused by the movable part and the impact force caused by the drive device during operation, and it is possible to reduce the impact force acting on one mechanism box.

(Embodiment) An embodiment of the present invention will be described below with reference to FIG. There is.

This container 1 is erected almost vertically and has openings at the top and bottom of the sides.
, lb.

On the other hand, the arc extinguishing chamber 2 includes a fixed part 3 and a movable part 4 which are arranged vertically to face each other. The fixed part 3 has a fixed electrode 5, and the movable part 4 has a movable electrode 6, an insulating nozzle 7, and a buffer cylinder 8. Note that the fixed electrode 5 and the movable electrode 6 are arranged opposite to each other so as to be able to freely approach and separate. Furthermore, conductors 9 and 10 are connected to the upper and lower ends of the arc extinguishing chamber 2, respectively, and are drawn out from openings la and lb of the container and electrically connected to adjacent equipment (not shown).

Further, a mechanism box 15 that supports the container 1 and the arc extinguishing chamber 2 is arranged below the container 1. A drive device 16 such as a hydraulic operation cylinder is housed within this mechanism box 15. Furthermore, the operating axis of the 1M moving unit [16] is offset by a predetermined distance from the operating axis of the movable part 4.

A first connecting rod 18 is connected to the lower part of the movable part 4 via an insulating rod 17. The lower end of the first connecting rod 18 is located at least within the mechanism box 15.

On the other hand, a second connecting rod 19 is connected above the drive device 16. The upper end of the second connecting rod 19 and the lower end of the first connecting rod 18 are connected via a link mechanism 20.

Next, the effects of this embodiment will be explained.

Now, it is assumed that a closing command is input in the cut-off state shown in FIG. In this case, the hydraulic operation cylinder within the drive device 16 descends in response to the closing command. As a result, the drive device 1
The second connecting rod 19 connected to 6 is lowered. This lowering of the second connecting rod 19 causes the end of the link mechanism 20 on the second connecting rod 19 side to lower, and the link mechanism 20 rotates counterclockwise.

As the link mechanism 20 rotates, the first connecting rod 18 connected to the other end of the link mechanism 20 rises.

As a result, the movable part 4 rises together with the insulating rod 17, comes into contact with the fixed part 3, and is electrically connected, thereby completing the closing operation.

Here, the movable parts on the arc extinguishing chamber 2 side from the link mechanism 20, such as the movable fft pole 6, the insulating nozzle 7, the buffer cylinder 8
, the mass of the insulating rod 17, the first connecting rod 18, etc. is m
Let it be l. In addition, the drive #I device 16 is connected to the link mechanism 20.
Side movable parts such as hydraulically operated cylinders.

The mass of the second connecting rod 19, etc. is assumed to be m2. At this time, if the acceleration required to operate the gas circuit breaker is α, the generated WR impact force F2 is approximately F, = (m□-m2
) is expressed as α.

That is, by adjusting the masses of the first and second connecting rods 18, 19, etc. to m and αm2, the impact force F2 can be set to 0.

In other words, is it a sum of moving parts like a conventional gas circuit breaker? ! The impact force F2 generated by this embodiment can be significantly reduced compared to the I@force F method.

This makes it possible to reduce the weight and size of the mechanism i15.

Moreover,? By reducing the rr impact force F, it is possible to reduce the adverse effects of vibration on nearby equipment when the gas circuit breaker is operated. Further, there is no need to increase the strength of the foundation, building, etc. on which the gas circuit breaker is mounted.

Moreover, by making the operating axes of the movable part 4 and the drive device 16 eccentric and connecting them with the link mechanism 20, the drive device 1G can be placed upward, so that the axial length of the mechanism section 15 can be shortened. .

In addition, although the closing operation was explained in this embodiment,
Since the shutoff operation is a reverse operation, the explanation will be omitted.

Next, another embodiment of the present invention will be described with reference to FIGS. 2 and 3. That is, in this embodiment, the present invention is applied to a three-phase lump-type gas circuit breaker in which three-phase arc extinguishing chambers 2a, 2b, and 2c are collectively housed in a container 1.

Note that here, the A, B, and C phases are denoted by symbols a and b, respectively.

C is attached.

The drive devices 16a, 16b, and 16c are alternately arranged in opposite directions. In addition, arc extinguishing chambers 2a, 2b,
2c is a mechanism box] It is placed at the apex of a triangle whose center is approximately the center of the mechanism box 5. Therefore, the moments generated around the center of the mechanism box 15 are offset and reduced.

〔Effect of the invention〕

As explained above, in the present invention, the operating direction of the movable part and the operating direction of the drive device are reversed via the link mechanism, so the small gas circuit breaker can reduce the impact force acting on the mechanism box. can be provided.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a gas circuit breaker showing an embodiment of the present invention;
Fig. 2 is a sectional view of a gas circuit breaker showing another embodiment of the present invention, Fig. 3 is a sectional view taken along the ■-■ arrow in Fig. 2, and Fig. 4 is a sectional view showing a conventional gas circuit breaker. be. 1... Container, la, lb... Outlet, 2, 2a, 2b, 2cm arc extinguishing chamber, 3... Fixed part, 4... Movable part, 5... Fixed electrode,
6... Movable electrode, 7... Insulated nozzle, 8...
...Buffer cylinder, 9,10...Conductor, 15-=
Mechanism box, 16. 16a, 16b, 16c... Drive device, 17... Insulating rod, 18... Connecting rod of [-], 19... Second connecting rod, 20, 20a, 20b, 20cm link mechanism. Agent Patent Attorney Nori Ken Yudo Daishimaru/6 Figure/6c Figure Figure Figure Figure

Claims (1)

[Claims] An arc extinguishing chamber is housed in a container filled with insulating gas, a mechanism box is placed at the end of the container, and the movable parts constituting the arc extinguishing chamber are operated by a drive device housed in the mechanism box. The gas circuit breaker according to claim 1, wherein the operating direction of the movable part and the operating direction of the drive device are reversed via a link mechanism.