JPH09204859A - Puffer type gas-blast circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance breaking performance to large current by forming a through hole in the radial direction in a second nozzle or an arc contact support, and exhausting the stay heat between an arc contact and the second nozzle. SOLUTION: When arc contacts 6, 7 are connected with an arc 8, arc- extinguishing gas is supplied from a flow path 24 formed with insulating first and second nozzles 18, 19 to the arc 8. When a breaker is opened, hot gas is accumulated in a space 21. The pressure in the space 21 is raised by the accumulated hot gas. The hot gas is exhausted to the flow path 24 through plural through holes 22 formed in the nozzle 19. The stay of the hot gas in the space 21 is eliminated, breaking performance to large current is enhanced, and the reliability of an electric power facility is enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a puffer-type gas circuit breaker that turns on and off a large-capacity current contact and injects an arc-extinguishing gas into an arc generated between contacts during a breaking operation to extinguish the arc.

[0002]

2. Description of the Related Art A puffer type gas circuit breaker is known as a device for turning on and off a high-capacity current contact and injecting an arc-extinguishing gas into an arc generated between contacts during a breaking operation to extinguish the arc. . Here, a conventional example of the puffer type gas circuit breaker will be described with reference to FIG. FIG. 8 is a cross-sectional view of a breaking unit that cuts off a current during a breaking operation of a conventional puffer-type gas circuit breaker, and in FIG.

A conventional puffer type gas circuit breaker includes a container 1 filled with arc extinguishing gas, and a first contact portion 2 and a second contact portion 3 which are provided in the container 1 so as to be in contact with and separable from each other. Have. These first contact portion 2 and second contact portion 3 are generated between the energizing contact portions 4 and 5, which are energized at the time of contact, and between the first contact portion 2 and the second contact portion 3 at the time of opening / closing operation. Arc contacts 6 and 7 for guiding the arc are provided. In addition, the puffer piston 9 and the puffer cylinder 10 that extinguish arc by injecting an arc extinguishing gas into the arc 8 generated between the arc contacts 6 and 7 at the time of the opening and closing operation.
Is provided.

A contact base 12 for mounting the first contact piece 2 is fixed to the inner surface of the container 1 via an insulating cylinder 11. Also, this contact base 12
A contact base 14 for mounting the second contact portion 3 is insulated and supported by the insulating cylinder 13. The second contact part 3 including the current-carrying contact 5 and the arc contact 7 is fixed on the contact base 14.

[0005] The first contact portion 2 is slidably mounted on the contact base 12 so as to face the second contact portion 3, and is configured so as to be able to contact and separate from the second contact portion 3. ing. Specifically, the operation rod 15 for driving the first contactor portion 2 slidably penetrates through the contact base 12, and the energizing contactor 4 and the arc contactor support included in the first contactor portion 2 are supported. 16 is this operation rod 1
5 is fixed to one end side. The arc contact 6 is held by the arc contact support 16. The other end of the operating rod 15 is connected to a drive unit outside the container 1 via an insulating rod 17.

The puffer piston 9 is fixed on the contact base 12, and the puffer cylinder 10 for compressing the arc-extinguishing gas together with the puffer piston 9 is fixed to the operating rod 15. Further, an insulating first nozzle 18 and an insulating second nozzle 19 for focusing the arc extinguishing gas compressed by the puffer piston 9 and the puffer cylinder 10 on the operating rod 15 are fixed. Has been done. In addition, puffer piston 9,
A space surrounded by the puffer cylinder 10 and the operation rod 15 is a puffer chamber 20 for pressurizing the arc extinguishing gas.

The conventional puffer type gas circuit breaker having the above-mentioned structure has the following actions during the breaking operation. That is, when a drive unit (not shown) drives the first contact piece 2 in a direction away from the second contact piece 3 via the insulating rod 17 and the operation rod 15, the puffer cylinder 10 of the first contact piece 2 is moved. The arc-extinguishing gas in the puffer chamber 20 is compressed by moving toward the puffer piston 9. The compressed arc-extinguishing gas becomes a gas flow and is jetted toward the arc 8 through the flow path between the first nozzle 18 and the second nozzle 19 to cool and extinguish the arc 8.

By the way, as the demand for electric power is expected to grow in the future, the rated breaking current of the circuit breaker is increasing as the short-circuit capacity of the power system increases. When the breaking current increases in this way, the amount and temperature of the hot gas generated in the circuit breaker accordingly increase.

[0009]

However, the puffer type gas circuit breaker having the above-mentioned structure has the following problems.

The hot gas generated by the arc 8 during the breaking operation also diffuses into the space 21 between the arc contact 6 and the second nozzle 19, as shown in FIG. In particular, since there is almost no arc-extinguishing gas flow immediately after the opening, the proportion of hot gas diffused in the space 21 also increases. Even if the contact opening operation further progresses, the gas flow does not directly blow into the space 21, so that the hot gas accumulated in the space 21 can only diffuse naturally.

In general, in breaking a small loop of an asymmetrical current containing a DC component, a current exceeding 100 kA flows at the time of opening. Therefore, a large amount of energy also flows into the space 21. When the small loop is cut off, the current is once cut off even when the distance between the contacts is not so large, so that it is easily affected by the energy remaining in the space 21, and the arcing is likely to occur again, and the breaking performance is deteriorated.

An object of the present invention is to provide a puffer type gas circuit breaker which exhibits excellent breaking performance even with a large breaking current.

[0013]

According to a first aspect of the present invention, there is provided a container filled with an arc extinguishing gas, and a first contact portion and a second contact portion which are provided in the container and contact with each other when energized and separate when disconnected. And a current-carrying contactor provided in each of the first contactor section and the second contactor section and contacting each other when energized, and a first contactor provided in each of the first contactor section and the second contactor section during a separating operation. An arc contactor for guiding an arc generated between the first contactor part and the second contactor part, and the first contactor part is extinguished by being compressed by the puffer piston and the puffer cylinder during the separating operation. A puffer-type gas circuit breaker provided with a first nozzle and a second nozzle that form a flow path for guiding an arc gas into an arc, wherein the second nozzle is provided with a plurality of through holes penetrating in the radial direction. Is.

According to the first aspect of the present invention, when the hot gas accumulates in the space between the arc contactor and the second nozzle in the first contactor section and the pressure rises, the hot gas is discharged from the through hole of the second nozzle. It Therefore, the hot gas does not stay in the space between the arc contactor and the second nozzle in the first contactor section. Therefore, it is possible to provide a puffer type gas circuit breaker that exhibits excellent breaking performance even with a large current.

According to a second aspect of the invention, in the first aspect of the invention, the through hole is formed so that the cross-sectional area of the through hole becomes smaller in proportion to the distance from the central axis of the puffer type gas circuit breaker main body. Is.

According to the invention of claim 2, in addition to the operation of claim 1, since the area where the through hole of the second nozzle is open to the first nozzle side is small, the flow between the first nozzle and the second nozzle is small. Less arc extinguishing gas leaks from the road. Therefore,
The extinguishing force of the arc extinguishing gas on the arc 8 does not decrease.

The third aspect of the present invention is the first or second aspect.
In the invention described above, the through hole is formed so that the angle formed by the central axis of the through hole and the flow velocity direction of the arc-extinguishing gas is smaller than 90 degrees.

According to the invention of claim 3, in addition to the action of the invention of claim 1 or 2, the through hole of the second nozzle forms an acute angle with the flow path between the first nozzle and the second nozzle. Since they intersect, the arc-quenching gas is less likely to flow back from the flow path, and the blowing force of the arc-quenching gas to the arc can be maintained.

The invention of claim 4 is the first to third aspects of the invention.
In the invention, the through hole is formed so as to be an elongated hole that is long in the central axis direction of the puffer type gas circuit breaker main body.

According to the invention of claim 4, in addition to the effect of the invention of claims 1 to 3, since the through hole of the second nozzle is a long hole which is long in the direction of the flow path, the first nozzle and the second nozzle Disturbance with respect to the flow of the flow path between the nozzles is reduced, and the blowing force of the arc-extinguishing gas with respect to the arc can be maintained.

According to a fifth aspect of the present invention, a container filled with an arc-extinguishing gas, a first contactor portion and a second contactor portion, which are provided in the container and contact with each other when energized and open when interrupted, and a first contactor. Parts and the second contact part, which are respectively provided in the first contact part and the second contact part, and which come into contact with each other when energized, and the first contact part and the second contact part, which are respectively provided in the first contact part and the second contact part, during the separating operation. Has an arc contactor for inducing an arc generated between the arc part and the first contact part, and the first contact part guides the arc extinguishing gas compressed and ejected by the puffer piston and puffer cylinder during the opening / closing operation. Is a puffer-type gas circuit breaker provided with a first nozzle and a second nozzle that form a flow path for operating the arc contactor supporting the arc contactor provided in the first contactor portion, and With a plurality of through holes .

In the invention of claim 5, the hot gas accumulated in the space between the arc contactor and the second nozzle in the first contactor portion is discharged from the through hole provided in the arc contactor support. Therefore, the hot gas does not stay in the space between the arc contactor and the second nozzle in the first contactor section.

According to a sixth aspect of the present invention, in the fifth aspect, the constituent pieces of the arc contactor in the first contactor section are:
The width of the central portion in the axial direction is made narrower than that of the other portions, and the through hole is formed.

According to the invention of claim 6, in addition to the operation of the invention of claim 5, the first contact is made from the narrow portion of the constituent piece of the arc contactor through the through hole provided in the arc contactor support. The hot gas accumulated in the space between the arc contactor and the second nozzle in the child part is discharged. Therefore, hot gas does not stay in the space.

According to a seventh aspect of the present invention, in the fifth aspect, the constituent pieces of the arc contactor in the first contactor portion are:
A central portion in the axial direction is cut out in a semi-elliptical shape to form a through hole.

According to the invention of claim 7, in addition to the action of the invention of claim 5, since the central portion of the constituent piece of the arc contact in the first contact portion is cut out in a semi-elliptical shape, The cross-sectional area of the part can be increased, and the decrease in mechanical strength is small.

[0027]

Embodiments of the present invention will be described below. FIG. 1 is a sectional view of a first contactor portion of a puffer type gas circuit breaker according to a first embodiment of the present invention. In the first embodiment, the second nozzle 19 is provided with a plurality of through holes 22 penetrating in the radial direction.

FIG. 1 shows a state in which the arc contactor 6 of the first contactor portion and the arc contactor 7 of the second contactor portion are connected by the arc 8. An arc extinguishing gas is supplied to the arc 8 from a flow path 24 formed by an insulating first nozzle 18 and a second nozzle 19. The arc contactor 6 of the first contactor portion is fixed by the arc contactor support 16.

When the breaker is opened, hot gas is accumulated in the space 21 between the arc contact 6 and the second nozzle 19 in the first contact part. The hot gas is discharged into the flow path 24 through the plurality of through holes 22 provided in the second nozzle 19.
That is, the arc contactor 6 and the second contactor in the first contactor portion are
When the hot gas is accumulated in the space 21 between the nozzle 19 and the nozzle 19, the pressure in that portion rises, and due to the increase in the pressure, the second nozzle 1
The hot gas is discharged from the through hole 22 of 9.

As described above, according to the first embodiment,
Since the hot gas does not stay in the space 21, excellent blocking performance can be exhibited even with a large current.

FIG. 2 is a sectional view of the first contactor portion of the puffer type gas circuit breaker according to the second embodiment of the present invention. The second embodiment differs from the first embodiment shown in FIG. 1 in that the cross-sectional area of the through hole 22 is reduced in proportion to the distance from the central axis of the puffer type gas circuit breaker body. It is the one.

In FIG. 2, the cross-sectional area of the through hole 22 becomes smaller as it goes away from the central axis of the puffer type gas circuit breaker body. That is, the area of the arc-extinguishing gas facing the flow path 24 is small, and the space 21 where the hot gas is accumulated is formed.
The through hole 22 is formed so that the area in contact with is large. The center axis of the puffer type gas circuit breaker main body is located at substantially the same position as the center axis of the arc contactor 7 of the first contactor portion in FIG.

In the second embodiment, when the pressure of the space 21 is high due to the hot gas, the space 21 passes through the through hole 22.
Through which hot gas is discharged. In this case, since the cross-sectional area of the through hole 22 on the first nozzle 18 side (flow passage side) is small, the gas flow of the arc extinguishing gas between the first nozzle 18 and the second nozzle 19 is not obstructed. That is, since the area in which the through hole 22 of the second nozzle 19 is open to the first nozzle 18 side is small, there is little leakage of arc-extinguishing gas from the flow path 24 between the first nozzle 18 and the second nozzle 19. Complete. Therefore, the blowing force of the arc-extinguishing gas on the arc 8 does not decrease.

According to the second embodiment, the arc 8
The spraying force against is also maintained, and excellent breaking performance can be exhibited even for large currents.

FIG. 3 is a sectional view of a first contactor portion of a puffer type gas circuit breaker according to a third embodiment of the present invention. The third embodiment differs from the first embodiment shown in FIG. 1 so that the angle formed by the central axis of the through hole 22 and the flow direction of the arc-extinguishing gas is smaller than 90 degrees. The through hole 22 is formed.

In FIG. 3, the through hole 22 is formed diagonally to the left with respect to the flow path 24 of the arc extinguishing gas. That is, the through hole 22 is formed such that the central axis of the through hole 22 forms an acute angle with respect to the flow direction of the arc extinguishing gas. The arc-extinguishing gas flows from right to left in FIG.

In the third embodiment, when the pressure of the space 21 is high due to the hot gas, the space 21 passes through the through hole 22.
Through which hot gas is discharged. After the pressure in the puffer chamber 20 rises and becomes higher than the space 21, the gas tries to flow into the space 21 from the flow path 24 between the first nozzle 18 and the second nozzle 19, but the through hole Since 22 is provided in the direction opposite to the gas flow direction, the flow into the space 21 is almost prevented. Therefore, the blowing force of the arc extinguishing gas on the arc 8 is maintained.

According to the second embodiment, since the through hole 22 of the second nozzle 19 intersects the flow path 24 between the first nozzle 18 and the second nozzle 19 at an acute angle, Arc extinguishing gas is less likely to flow back from the flow path 24,
The blowing force of the arc extinguishing gas on the arc 8 can be maintained. That is, the spraying force against the arc 8 is also maintained, and the excellent breaking performance can be exhibited even with a large current.

FIG. 4A is a sectional view of the first contactor portion of the puffer type gas circuit breaker according to the fourth embodiment of the present invention. The fourth embodiment is different from the first embodiment shown in FIG. 1 in that the through hole 22 is formed to be an elongated hole that is long in the central axis direction of the puffer type gas circuit breaker main body. is there. That is, as shown in FIG. 4B, the through hole 22 of the second nozzle 19 is an elongated hole that is long in the axial direction.

In the fourth embodiment, the through holes 22 are elongated holes to ensure a sufficient cross-sectional area for discharging hot gas, and there is no large cross-sectional area loss in the circumferential direction. The mechanical strength can be maintained.

According to the fourth embodiment, since the through hole 22 of the second nozzle 19 is a long hole which is long in the direction of the flow path 24, there is a gap between the first nozzle 18 and the second nozzle 19. The disturbance with respect to the flow of the arc-extinguishing gas in the flow path 24 is reduced, and the blowing force of the arc-extinguishing gas on the arc 8 can be maintained.

Next, FIG. 5 shows a fifth embodiment of the present invention. In the fifth embodiment, the arc contactor support 16 for holding the arc contactor 6 provided in the first contactor portion is provided.
In addition, a plurality of through holes 23 penetrating in the radial direction are provided. That is, in the first to fourth embodiments, the second nozzle 19 is provided with the through hole, but in the fifth embodiment, as shown in FIG. 16 is provided with a through hole 23 penetrating in the radial direction.

In the fifth embodiment, the hot gas accumulated in the space 21 between the arc contactor 6 and the second nozzle 19 in the first contactor portion is provided with a through hole provided in the arc contactor support 16. Discharge from 23. Therefore, hot gas does not stay in the space 21 between the arc contactor 6 and the second nozzle 19 in the first contactor portion.

According to the fifth embodiment, the space 21
The hot gas accumulated in the above can pass through the gap of the arc contactor 6 and exit from the through hole 23. Therefore, an excellent breaking performance can be exhibited even for a large current.

FIG. 6 shows a sixth embodiment of the present invention. FIG. 6A is a cross-sectional view of the first contactor portion of the puffer type gas circuit breaker according to the sixth embodiment. This sixth
In the embodiment of the present invention, a through hole 25 is formed in the arc contactor 6 of the first contactor portion as compared with the fifth embodiment shown in FIG.

FIG. 6B is a side view of the arc contactor 6 of the first contactor portion. As can be seen from FIG. 6B, the arc contactor 6 in the first contactor portion is composed of a plurality of constituent pieces 26, and each constituent piece 26 has a width in the central portion in the axial direction of the other portion. The through hole 25 is formed so as to be narrower.

In the sixth embodiment, the first portion is passed through the narrow portion of the constituent piece 26 of the arc contactor 6, that is, from the through hole 25 through the through hole 23 provided in the arc contactor support 16. The hot gas accumulated in the space 21 between the arc contactor 6 and the second nozzle 19 in the contactor portion is discharged. Therefore, hot gas does not stay in the space.

According to the sixth embodiment, a large gap (through hole 25) is formed at a portion where the arc contacts 6 contact each other.
Therefore, the hot gas can easily pass through, and the exhaust efficiency of the hot gas accumulated in the space 21 can be improved.

FIG. 7 shows a seventh embodiment of the present invention. FIG. 7A is a cross-sectional view of the first contactor portion of the puffer type gas circuit breaker according to the seventh embodiment. This seventh
6 is different from the sixth embodiment shown in FIG. 6 in that the through hole 2 formed in the arc contactor 6 of the first contactor portion is different from the sixth embodiment shown in FIG.
5 is a long oval. That is, FIG.
As shown in (b), the component piece 26 of the arc contactor 6 in the first contactor portion is formed by cutting out the central portion in the axial direction into a semielliptical shape to form an oval through hole 25.

In the seventh embodiment, since the central portion of the constituent element 26 of the arc contactor 6 in the first contactor portion is cut out in a semi-elliptical shape, when the arc contactor 6 is constructed. A long oval through hole 25 is formed.

According to the seventh embodiment, the cross-sectional area of the gap for the hot gas can be secured and the reduction of the remaining cross-sectional area of the notched portion can be suppressed.
It does not hinder the passage of electric current and can maintain its mechanical strength.

[0052]

As described above, according to the present invention, the second nozzle or the arc contactor support is provided with the through hole in the radial direction, and the space between the arc contactor and the second nozzle in the first contactor portion is provided. Since the hot gas staying in the space is discharged, it is possible to provide a puffer type gas circuit breaker exhibiting excellent breaking performance even against a large current. As a result, it is possible to build a more reliable power facility.

[Brief description of drawings]

FIG. 1 is a sectional view of a first contact portion of a puffer type gas circuit breaker according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a first contactor portion of a puffer type gas circuit breaker according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a first contactor portion of a puffer type gas circuit breaker according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a first contact portion of a puffer type gas circuit breaker according to a fourth embodiment of the present invention.

FIG. 5 is a sectional view of a first contactor portion of a puffer type gas circuit breaker according to a fifth embodiment of the present invention.

FIG. 6 is a sectional view of a first contactor portion of a puffer type gas circuit breaker according to a sixth embodiment of the present invention.

FIG. 7 is a sectional view of a first contactor portion of a puffer type gas circuit breaker according to a seventh embodiment of the present invention.

FIG. 8 is a sectional view of a conventional puffer type gas circuit breaker.

FIG. 9 is a cross-sectional view of a first contact portion in a conventional puffer type gas circuit breaker.

[Explanation of symbols]

 1 Container 2 1st Contact Part 3 2nd Contact Part 4, 5 Current Contact 6, 7 Arc Contact 8 Arc 9 Puffer Piston 10 Puffer Cylinder 11, 13 Insulation Cylinder 12, 14 Contact Base 15 Operation Rod 16 Arc Contact Child support 17 Insulating rod 18 Insulating first nozzle 19 Insulating second nozzle 20 Puffer chamber 21 Space 22 Through hole 23 Through hole 24 Flow path 25 Through hole 26 Component pieces

Claims (7)

[Claims] 1. A container filled with an arc-extinguishing gas, a first contactor portion and a second contactor portion which are provided in the container and which are in contact with each other when energized and are opened when disconnected, the first contactor portion and the first contactor portion. Two
Current-carrying contactors, which are respectively provided in the contactor sections and contact each other when the current is applied, and the first contactor section and the second contactor, which are respectively provided in the first contactor section and the second contactor section, during the opening operation. An arc contactor for inducing an arc generated between the arc-extinguishing gas and the first contactor part, and the arc-extinguishing gas compressed and ejected by the puffer piston and the puffer cylinder during the opening operation. In a puffer type gas circuit breaker provided with a first nozzle and a second nozzle that form a flow path for guiding to the arc, the second nozzle is provided with a plurality of through holes penetrating in a radial direction. Puffer type gas circuit breaker. 2. The through hole is formed so that the cross-sectional area of the through hole becomes smaller in proportion to the distance from the central axis of the puffer-type gas circuit breaker body. Item 1. A puffer-type gas circuit breaker according to Item 1. 3. The angle formed by the central axis of the through hole and the flow velocity direction of the arc extinguishing gas is smaller than 90 degrees,
The puffer type gas circuit breaker according to claim 1, wherein the through hole is formed. 4. The puffer type gas breaker according to claim 1, wherein the through hole is formed as an elongated hole elongated in a central axis direction of the puffer type gas circuit breaker main body. vessel. 5. A container filled with an arc-extinguishing gas, a first contactor portion and a second contactor portion which are provided in the container and which are in contact with each other when energized and are opened when disconnected, the first contactor portion and the first contactor portion. Two
Current-carrying contactors, which are respectively provided in the contactor sections and contact each other when the current is applied, and the first contactor section and the second contactor, which are respectively provided in the first contactor section and the second contactor section, during the opening operation. And an arc contactor for inducing an arc generated between the arcuate part and the first contactor part, and the arc-extinguishing gas compressed and ejected by the puffer piston and the puffer cylinder during the opening operation. In a puffer type gas circuit breaker provided with a first nozzle and a second nozzle that form a flow path for guiding the arc, an arc contact support that holds an arc contact provided in the first contact section. A puffer-type gas circuit breaker, characterized in that a plurality of through-holes penetrating in the radial direction are provided in the. 6. A component piece of the arc contactor in the first contactor portion is configured such that a width of a central portion in an axial direction thereof is narrower than that of other portions to form the through hole. The puffer type gas circuit breaker according to claim 5, wherein 7. The arc contactor component pieces in the first contactor portion are formed by cutting out the axial center portion in a semi-elliptical shape to form the through hole. The puffer type gas circuit breaker according to claim 5.