JP2021034172A - Gas circuit breaker - Google Patents

Abstract

To prevent galling between a puffer cylinder and an external current collector by a simple configuration.SOLUTION: A gas circuit breaker includes a puffer cylinder for compressing and extinguishing an insulating gas in a gas tank filled with the insulating gas, and an external current collector having a contact portion that is in sliding contact with a contact portion of the puffer cylinder. Contact surfaces of the contact portion of the puffer cylinder and the contact portion of the external current collector are formed in a planar shape, and the contact portion of the puffer cylinder and the contact portion of the external current collector slide in contact with each other at a flat surface portion.SELECTED DRAWING: Figure 2

Description

The present invention relates to a gas circuit breaker, and more particularly to a gas circuit breaker suitable for a puffer cylinder and an external current collector in electrical sliding contact.

A gas circuit breaker is an opening / closing device that cuts off high-voltage current, and is mainly installed in substations. This gas circuit breaker has a circuit breaker _{in a gas tank filled with an insulating gas such as SF 6} gas, and is connected to the actuator via an insulating rod.

Normally, when an abnormality such as a lightning strike is detected and a shutoff command is issued, the actuator pulls the insulating rod to pull the movable part connected to the insulating rod, and the movable side main contactor and the fixed side main contactor, The current is cut off by physically disconnecting the fixed arc contactor and the movable arc contactor. At that time, the current is cut off by blowing an insulating gas on the arc generated between the fixed arc contactor and the movable arc contactor.

The pressure formation of the insulating gas sprayed on the arc is performed in the puffer chamber. The movable puffer cylinder moves relative to the fixed puffer piston, and the volume of the puffer chamber is rapidly reduced, so that the insulating gas is compressed.

The high-pressure insulating gas compressed in the puffer chamber passes through the insulating nozzle and is blown between the fixed arc contactor and the movable arc contactor against the arc generated during the breaking operation.

Energization of the movable portion and the fixed portion is performed by sliding contact between the movable puffer cylinder and the fixed external current collector.

When assembling the gas circuit breaker, the puffer cylinder is inserted into the tubular external current collector, and the outer circumference of the external current collector is tightened with a spring (not shown) to bring the puffer cylinder and the external current collector into close contact and energize. Performance is ensured.

The external current collector has a tubular shape, but a slit is provided at the tip, and the external current collector is divided into a plurality of finger contacts. As a result, when tightened with a spring, the finger contact falls inward and comes into close contact with the puffer cylinder.

Since it is necessary to ensure energization performance, it is not possible to sandwich a bearing with excellent wear resistance between the puffer cylinder and the external current collector, and the puffer cylinder and the external current collector are silver-plated on the surface of each contact part. The metal with the bearing is in contact with each other.

Further, since the outer circumference of the puffer cylinder is a cylindrical surface, the inner surface of the finger contact of the external current collector in contact with the cylindrical surface is also a curved surface. Therefore, during the shutoff operation, the puffer cylinder and the external current collector slide while being in contact with each other on the metal curved surfaces.

The sliding of the metal of the puffer cylinder and the external current collector is more likely to cause galling due to the influence of surface roughness, hardness, surface pressure, etc., as compared with the case of using a bearing. In particular, the contact between curved surfaces is a point contact or a line contact because it is easy to hit one side, and there is a potential to generate galling by locally increasing the contact surface pressure.

In addition, metal powder is generated by biting the metals, and if the metal powder exists in the gas space of the gas circuit breaker, the risk of dielectric breakdown increases. Therefore, it is necessary to have a structure that does not cause galling between the puffer cylinder and the external current collector.

In this way, in a gas circuit breaker, as long as it is necessary to ensure energization performance, sliding between metals between the puffer cylinder and the external current collector is unavoidable. It is effective to make contact with an appropriate surface pressure after smoothing.

It is easy to smooth the contact surface by increasing the accuracy of machining, and it is also applied to existing gas circuit breakers, but there is room for improvement in contacting with an appropriate surface pressure.

For this reason, Patent Document 1 describes a gas circuit breaker that optimizes wear countermeasures between the puffer cylinder and the external current collector by plating the puffer cylinder and the finger contact in contact with the puffer cylinder with different hardnesses. Is described.

Japanese Unexamined Patent Publication No. 2006-325360

However, Patent Document 1 described above optimizes wear countermeasures by plating the puffer cylinder and the finger contact in contact with the puffer cylinder with different hardnesses, but this is the wear caused by the contact between the puffer cylinder and the finger contact. It is only a countermeasure (it does not completely prevent galling), and it is difficult to completely prevent galling between metals that come into contact only by devising the plating hardness, and galling occurs if the contact surface pressure is not appropriate. there is a possibility.

On the other hand, as a cause of generating inappropriate contact surface pressure, it is considered that one-sided contact is made on the contact surface. Normally, the contact surface pressure is designed on the assumption that the entire contact area is in contact with each other, so that the contact area becomes smaller when one side hits, and the contact surface pressure increases locally in inverse proportion to this, resulting in galling. appear. Therefore, in order to prevent galling between the metals in contact, it is necessary to prevent one-sided contact on the contact surface.

The present invention has been made in view of the above points, and an object of the present invention is to provide a gas circuit breaker capable of preventing galling between a puffer cylinder and an external current collector with a simple configuration. ..

In order to achieve the above object, the gas breaker of the present invention has a puffer cylinder that compresses and extinguishes the insulating gas in a gas tank filled with the insulating gas, and a contact portion of the puffer cylinder in sliding contact. In a gas circuit device provided with an external current collector having a contact portion, the contact surfaces of the contact portion of the puffer cylinder and the contact portion of the external current collector are formed in a flat shape, and the contact portion of the puffer cylinder and the contact portion of the external current collector are formed in a flat shape. The contact portion of the external current collector slides in contact with the flat portion.

According to the present invention, galling between the puffer cylinder and the external current collector can be prevented with a simple configuration.

It is an overall block diagram which shows Example 1 of the gas circuit breaker of this invention. FIG. 5 is a cross-sectional view showing a contact state between a puffer cylinder and an external current collector in Example 1 of the gas circuit breaker of the present invention. FIG. 5 is a cross-sectional view showing a contact state between a puffer cylinder and an external current collector in Example 2 of the gas circuit breaker of the present invention.

Hereinafter, the gas circuit breaker of the present invention will be described based on the illustrated examples. In each figure, the same reference numerals are used for the same components.

1 and 2 show Example 1 of the gas circuit breaker of the present invention, FIG. 1 shows the entire configuration of the gas circuit breaker of the present invention, and FIG. 2 shows the contact state between the puffer cylinder and the external current collector. The cross-sectional state of each is shown.

As shown in FIG. 1, the gas circuit breaker of this embodiment has a circuit breaker in a gas tank 1 filled with an insulating gas such as _{SF 6 gas, and is an actuator (not shown) via an insulating rod 2.} ) Is connected.

Normally, when an abnormality due to a lightning strike or the like is detected and a shutoff command is issued, the actuator pulls the insulating rod 2 to pull the movable part connected to the insulating rod 2, and the movable main contact 8 and the fixed main contact 8 are pulled. The current is cut off by physically disconnecting the contact 9, the fixed arc contact 3, and the movable arc contact 4. At that time, the current is cut off by blowing an insulating gas on the arc generated between the fixed arc contact 3 and the movable arc contact 4.

The pressure formation of the insulating gas blown to the arc is performed in the puffer chamber 7. The movable puffer cylinder 5 moves relative to the fixed puffer piston 6, and the volume of the puffer chamber 7 is rapidly reduced, so that the insulating gas is compressed.

The high-pressure insulating gas compressed in the puffer chamber 7 passes through the insulating nozzle 13 and is blown between the fixed arc contact 3 and the movable arc contact 4 against the arc generated during the breaking operation.

Energization of the movable portion and the fixed portion is performed by sliding contact between the movable puffer cylinder 5 and the fixed external current collector 12.

When assembling the gas circuit breaker, the puffer cylinder 5 is inserted into the tubular external current collector 12, and the outer circumference of the external current collector 12 is tightened with a spring (not shown) to allow the puffer cylinder 5 and the external current collector 12 to be assembled. Is in close contact with each other to ensure energization performance.

Although the external current collector 12 has a tubular shape, a slit is provided at the tip thereof, and the external current collector 12 is divided into a plurality of finger contacts. That is, the external current collector 12 has a disk-shaped flange 12a connected to the movable side conductor 11 and one end connected to the disk-shaped flange 12a, the other end extending in the axial direction and in the circumferential direction. It is composed of a plurality of finger contacts 12b arranged with a predetermined gap (slit), and a contact portion 12c of an external current collector 12 that is in sliding contact with a contact portion 5a of the puffer cylinder 5 is provided at the axial tip of the finger contact 12b. It is formed. The contact surfaces of the contact portion 5a of the puffer cylinder 5 and the contact portion 12c of the external current collector 12 are silver-plated.

In the external current collector 12 configured in this way, when the external current collector 12 is tightened with a spring from the outer peripheral side, a plurality of finger contacts 12b fall inward, and the contact portion 12c at the tip thereof and the contact portion 5a of the puffer cylinder 5 come into close contact with each other. It has become like.

Since it is necessary to ensure the energization performance, it is not possible to sandwich a bearing having excellent wear resistance between the puffer cylinder 5 and the external current collector 12, and the puffer cylinder 5 and the external current collector 12 are as described above. The surfaces of the contact portions 5a and 12c are in contact with each other with silver-plated metals.

The fixed side conductor 10, the fixed side main contact 9 and the fixed arc contact 3 are electrically connected, and the electrically connected movable side conductor 11, the external current collector 12, the puffer cylinder 5, and the movable side main contact are electrically connected. The child 8 and the movable arc contactor 4 are electrically connected to the fixed side in the closed state.

The puffer chamber 7 is a gas space formed by a fixed puffer piston 6 and a slidable puffer cylinder 5 connected to an insulating rod 2.

The pressure formation in the puffer chamber 7 of the insulating gas sprayed on the arc is performed by the puffer cylinder 5 moving relative to the puffer piston 6 and the volume of the puffer chamber 7 being rapidly reduced.

The high-pressure insulating gas compressed in the puffer chamber 7 passes through the insulating nozzle 13 and is blown between the fixed arc contact 3 and the movable arc contact 4 against the arc generated during the breaking operation.

In the gas circuit breaker of this embodiment, the contact surfaces of the contact portion 5a of the puffer cylinder 5 and the contact portion 12c of the external current collector 12 are formed in a plane, and the contact portion 5a of the puffer cylinder 5 and the external current collector 12c are formed in a plane. The contact portion 12c of the 12 is characterized in that it slides in a state of being in contact with the flat surface portion.

This will be described with reference to FIG. FIG. 2 shows a cross-sectional view of the contact state between the puffer cylinder 5 and the external current collector 12 in the first embodiment of the gas circuit breaker of the present invention.

As shown in FIG. 2, the outer circumference of the puffer cylinder 5 has a polygonal shape. On the other hand, in the external current collector 12, the tip of the finger contact 12b (that is, the contact portion 12c) is divided into the same number of finger contacts 12b as the polygon of the puffer cylinder 5, and the inner surface of the tip portion of each finger contact 12b (that is, that is). , The contact portion 12c) has a planar shape.

In FIG. 2, a dodecagon is taken as an example as a polygon, but the number of sides can be arbitrarily changed. Further, in FIG. 2, it seems that there is a gap between the puffer cylinder 5 and the external current collector 12, but this is for easy understanding, and they are actually in contact with each other. More specifically, a spring is wound around the outer circumference of the tip (contact portion 12c) of the finger contact 12b of the external current collector 12, and the puffer cylinder 5 and the external current collector 12 are brought into contact with each other at a constant surface pressure to energize.

As described above, in the gas circuit breaker of this embodiment, since the contact portion 5a of the puffer cylinder 5 and the contact portion 12c of the external current collector 12 are in flat contact, it is easier to prevent one-sided contact as compared with curved surface contact, and it is locally possible. It is unlikely that the contact surface pressure will increase. Therefore, when the puffer cylinder 5 slides, the possibility of galling with the external current collector 12 is reduced.

Therefore, according to this embodiment, the puffer cylinder 5 and the external current collector used for the gas circuit breaker are only changed by a slight shape change (simple configuration) of the two contacting parts (puffer cylinder 5 and the external current collector 12). It is possible to prevent galling during sliding between the cylinders.

FIG. 3 shows a cross-sectional view of the contact state between the puffer cylinder 5 and the external current collector 12 in the second embodiment of the gas circuit breaker of the present invention.

The gas circuit breaker of this embodiment is obtained by further dividing the external current collector 12 into a plurality of external current collectors 12 in the circumferential direction from the structure shown in FIG.

That is, in the second embodiment shown in FIG. 3, the disk-shaped flange 12a of the external current collector 12 is divided into a plurality of pieces as shown by reference numerals 12a1, 12a2, 12a3, 12a4 in the circumferential direction, and each of the divided pieces is divided into a plurality of pieces. A plurality of finger contacts 12b are connected to the flanges 12a1, 12a2, 12a3, 12a4, and the contact portion 5a of the puffer cylinder 5 and the contact portion 12c of the external current collector 12 slide in a flat state. .. In the second embodiment shown in FIG. 3, the structure in which the flange 12a is divided into four in the circumferential direction is described as an example.

As a result, instead of inserting the puffer cylinder 5 into the external current collector 12, the external current collector 12 is provided so that each finger contact 12b is pressed against the puffer cylinder 5 from the state where the puffer cylinder 5 is attached. Since the external current collector 12 can be attached while adjusting the position of the screw with the screw hole formed in the movable side conductor 11 by the play hole, it becomes easier to prevent one-sided contact.

Further, for example, even if the contact state of one finger contact 12b is poor, only the corresponding one-quarter external current collector 12 needs to be corrected or replaced, so that there is less backtracking work and the assembly efficiency is improved. can get.

The present invention is not limited to the above-described examples, and includes various modifications. For example, the above-described examples have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.

1 ... Gas tank, 2 ... Insulated rod, 3 ... Fixed arc contactor, 4 ... Movable arc contactor, 5 ... Puffer cylinder, 5a ... Puffer cylinder contact part, 6 ... Puffer piston, 7 ... Puffer chamber, 8 ... Movable side Main contactor, 9 ... Fixed side main contactor, 10 ... Fixed side conductor, 11 ... Movable side conductor, 12 ... External current collector, 12a, 12a1, 12a2, 12a3, 12a4 ... Flange, 12b ... Finger contact, 12c ... External Contact part of current collector, 13 ... Insulated nozzle.

Claims (5)

In a gas circuit breaker equipped with a puffer cylinder that compresses and extinguishes the insulating gas in a gas tank filled with the insulating gas, and an external current collector having a contact portion that makes sliding contact with the contact portion of the puffer cylinder. ,
The contact surfaces of the contact portion of the puffer cylinder and the contact portion of the external current collector are formed in a planar shape, and the contact portion of the puffer cylinder and the contact portion of the external current collector are in contact with each other on a flat surface. A gas circuit breaker characterized by moving. In a gas circuit breaker equipped with a puffer cylinder that compresses and extinguishes the insulating gas in a gas tank filled with the insulating gas, and an external current collector having a contact portion that makes sliding contact with the contact portion of the puffer cylinder. ,
The outer circumference of the puffer cylinder is made polygonal, the tip of the external current collector is divided into the same number as the polygonal shape of the puffer cylinder, and the shape of each contact portion of the external current collector is polygonal. A gas circuit breaker characterized by being formed. In the gas circuit breaker according to claim 1 or 2.
The external current collector includes a disk-shaped flange connected to a movable side conductor, and a plurality of external current collectors arranged at one end connected to the flange, the other end extending in the axial direction, and having a predetermined gap in the circumferential direction. Consists of finger contacts
A gas circuit breaker characterized in that a contact portion of the external current collector that makes sliding contact with the contact portion of the puffer cylinder is formed at the axial tip of the finger contact. In the gas circuit breaker according to claim 3,
A gas circuit breaker characterized in that the disk-shaped flange of the external current collector is divided into a plurality of pieces in the circumferential direction, and a plurality of the finger contacts are connected to each of the plurality of divided flanges. In the gas circuit breaker according to any one of claims 1 to 4.
A gas circuit breaker characterized in that the contact surfaces of the contact portion of the puffer cylinder and the contact portion of the external current collector are each plated with silver.

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