WO2018066119A1

WO2018066119A1 - Gas circuit breaker

Info

Publication number: WO2018066119A1
Application number: PCT/JP2016/079875
Authority: WO
Inventors: 周也真島; 崇文飯島; 吉野　智之; 旭島村; 嵩人石井; 隆介落合
Original assignee: 株式会社東芝; 東芝エネルギーシステムズ株式会社
Priority date: 2016-10-06
Filing date: 2016-10-06
Publication date: 2018-04-12
Also published as: JPWO2018066119A1; JP6659864B2; CN109496342A

Abstract

Provided is a gas circuit breaker that is able to exhibit excellent breaking performance by determining an exhaust direction of heat gas even when the space for treating the heat gas is reduced in size. A movable part 4 is provided with a heat gas treatment space 13 into which heat gas 9 heated to a high temperature by an arc discharge 6 is introduced from a space in which the arc discharge 6 is generated. In the heat gas treatment space 13, exhaust holes 17a-17c that suppress pressure increase in the heat gas treatment space 13 are disposed along the direction from upstream to downstream of the heat gas 9. The exhaust holes 17a-17c are provided such that the downstream side thereof has a smaller cross-sectional area than the upstream side thereof.

Description

Gas circuit breaker

Embodiment of this invention is related with the gas circuit breaker which provided the exhaust hole in the hot gas processing space which takes in a hot gas.

In gas circuit breakers that perform current switching in the electric power system, a type called a puffer type is now widely used. In a gas circuit breaker, a fixed part and a movable part are arranged in a sealed container filled with an arc-extinguishing gas so as to face and concentrically face each other on a concentric axis. A fixed arc contact and a fixed energizing contact are provided on the fixed portion side, and a movable arc contact and a movable energizing contact are provided on the movable portion side, respectively.

As an insulating medium and arc extinguishing medium used for the gas circuit breaker, SF ₆ gas is mainly used. Furthermore, in order to reduce the amount of SF ₆ gas that has a high warming effect, gas other than SF ₆ gas is used as an insulating medium and arc-extinguishing medium, or a mixed gas mixed with various gases is used as an insulating medium and an extinguishing medium. Sometimes used as an arc medium.

In the gas circuit breaker as described above, in the closed state, the fixed part and the movable part are in contact with each other and conduct current. Also, when the fixed part and the movable part are separated when a large current is interrupted, a steep transient recovery voltage is applied immediately after the current is interrupted, so that an arc discharge occurs between the fixed arc contact and the movable arc contact. appear.

Since the puffer-type gas circuit breaker has a pressure accumulating means for blowing a gas to the arc discharge, the blown gas becomes a high-temperature hot gas by the arc discharge. This hot gas passes through the inside of the movable part and the fixed part from the space where the arc discharge is generated, and is diffused into the sealed container. When the hot gas is conductive in the hot state and dissipates from the inside of the movable part and the fixed part into the sealed container, a high electric field part is generated in the part where the hot gas is dissipated in the movable part and the fixed part. . Therefore, a ground fault may occur between the movable part and the fixed part side and the sealed container. As a result, the breaking performance of the gas circuit breaker may be reduced.

Therefore, in the conventional gas circuit breaker, a hot gas processing space for taking in hot gas by arc discharge is provided inside the movable part and the fixed part. The hot gas processing space is provided, for example, inside a movable part support for supporting the movable part and a fixed part support for supporting the fixed part. The hot gas treatment space is configured by being surrounded by wall surfaces of the members constituting the movable part and the fixed part, but it is necessary to provide an exhaust hole in the wall surface part in order to avoid a pressure increase in the hot gas treatment space. .

In the gas circuit breaker having such a hot gas processing space, the hot gas generated between the arc contacts flows into the hot gas processing space. At this time, the gas existing in advance in the hot gas processing space is pushed by the flowing hot gas and flows out from the exhaust hole to the internal space of the sealed container. The hot gas that has flowed into the hot gas processing space is cooled by entering the hot gas processing space, and then is diffused from the exhaust hole into the sealed container.

According to the gas circuit breaker as described above, it is possible to reduce the conductivity by cooling the hot gas in the hot gas processing space, and it is possible to avoid the formation of a high electric field portion near the exhaust hole. . Thereby, it becomes possible to prevent the occurrence of a ground fault in the sealed container, and it is possible to maintain an excellent blocking performance.

JP 2014-41745 A

In recent years, in gas circuit breakers, it has been emphasized that the use of SF ₆ gas having a high warming effect is reduced to suppress the influence on warming. Therefore, there is a demand for reducing the volume of the sealed container, that is, making it compact. If the airtight container is made compact, the amount of arc extinguishing gas filled in the airtight container will also be reduced, so in addition to suppressing the impact on global warming, it is possible to shorten the time for gas recovery and filling during maintenance. The benefits are great. Therefore, in the gas circuit breaker, there is a tendency that the diameter of the sealed container is reduced in order to reduce the size.

However, in a gas circuit breaker having a hot gas processing space, when the diameter of the sealed container is reduced, the capacity of the hot gas processing space is correspondingly reduced, so that the amount of hot gas flowing into the hot gas processing space is reduced. Get smaller. Therefore, there is a possibility that the hot gas flowing into the hot gas processing space may flow out from the exhaust hole to the space in the sealed container before it is sufficiently cooled down.

As a result, even if a hot gas processing space is provided, the hot gas is discharged to the space in the sealed container with a high temperature, and a high electric field portion is easily formed near the exhaust hole. Therefore, there is a possibility that a ground fault occurs between the movable part and the fixed part and the sealed container. Therefore, conventionally, there has been a problem of how to exhaust hot gas from a small-capacity hot gas processing space without forming a high electric field portion.

The present embodiment has been proposed to solve the above-described problems, and its purpose is to provide excellent shut-off performance even if the hot gas processing space is reduced by defining the hot gas exhaust direction. An object of the present invention is to provide a gas circuit breaker that can be used.

In order to achieve the above object, an embodiment of the present invention includes a component (9) in a gas circuit breaker including the following components (1) to (8).
(1) A sealed container filled with an arc extinguishing gas.
(2) A fixed portion and a movable portion that are disposed in the sealed container so as to face and concentrically face each other on a concentric axis.
(3) A fixed arc contact and a fixed energization contact provided in the fixed portion.
(4) A movable arc contact and a movable energized contact provided in the movable part.
(5) An arc discharge space in which hot gas due to arc discharge can be generated between the fixed arc contact and the movable arc contact when the fixed portion and the movable portion are separated.
(6) A hot gas processing space provided in at least one of the fixed portion and the movable portion so as to take in the hot gas from the arc discharge space.
(7) A wall portion surrounding the hot gas treatment space.
(8) An exhaust hole that is formed in the wall surface portion and communicates the hot gas processing space and the space in the sealed container.
(9) In the hot gas processing space, the arc discharge space side is the upstream side of the hot gas, the exhaust hole side is the downstream side of the hot gas, and the exhaust hole is from a cross-sectional area on the upstream side of the hot gas. Also, the downstream cross-sectional area is made smaller.

In the embodiment of the present invention, the gas circuit breaker having the components (1) to (8) may have the following component (10).
(10) A baffle that closes the exhaust hole with a predetermined interval and is installed in parallel with the equipotential surface near the exhaust hole.
Furthermore, the embodiment of the present invention may include the following component (11) in the gas circuit breaker having the components (1) to (8).
(11) The exhaust hole opens in the axial direction of the fixed part or the movable part.

FIG. 3 is a cross-sectional structure diagram of the first embodiment (a state during a current interruption operation). FIG. 2 is a cross-sectional structure diagram of the first embodiment (a state during a charging operation). The principal part side view of 1st Embodiment. The principal part side surface sectional view of a 1st embodiment. FIG. 3 is a plan view showing an equipotential surface in the vicinity of an exhaust hole in the first embodiment (a state in which a gas flow is exhausted). The top view which shows the equipotential surface of the exhaust hole vicinity in a comparative example (state before exhausting a gas flow). The top view which shows the equipotential surface of the exhaust hole vicinity in a comparative example (state which exhausted the gas flow). The side view which shows the equipotential surface of the exhaust hole vicinity in 2nd Embodiment (state before exhausting a gas flow). The side view which shows the equipotential surface of the exhaust hole vicinity in 2nd Embodiment (The state which exhausted the gas flow). The side view which shows the equipotential surface of the exhaust hole vicinity in 2nd Embodiment (state before exhausting a gas flow). The side view which shows the equipotential surface of the exhaust hole vicinity in 2nd Embodiment (The state which exhausted the gas flow). The top view which shows the equipotential surface of the exhaust hole vicinity in 3rd Embodiment (The state before exhausting a gas flow). The top view which shows the equipotential surface of the exhaust hole vicinity in 3rd Embodiment (The state which exhausted the gas flow). The side view (state before exhausting a gas flow) which shows the equipotential surface of exhaust hole vicinity in other embodiment. The principal part side view of other embodiment. The principal part side view of other embodiment. FIG. 6 is a cross-sectional structure diagram of another embodiment (a state during a current interruption operation). The side view (state which exhausted the gas flow) which shows the equipotential surface of exhaust hole vicinity in other embodiment. The side view (state which exhausted the gas flow) which shows the equipotential surface of exhaust hole vicinity in other embodiment.

Hereinafter, embodiments of a gas circuit breaker according to the present invention will be described with reference to the drawings. All of the gas circuit breakers according to the following embodiments are puffer-type gas circuit breakers, and include a hot gas processing space for taking in hot gas generated between arc contacts, and an internal pressure rise in the hot gas processing space. An exhaust hole is provided for restraining.

(1) First embodiment (configuration)
[Outline of gas circuit breaker]
An outline of the puffer type gas circuit breaker will be described with reference to FIGS. 1 and 2. FIG. 1 shows a state during a current interruption operation, and FIG. 2 shows a closing state. In addition, each component in a figure is a coaxial cylindrical shape in general.

As shown in FIGS. 1 and 2, the puffer-type gas circuit breaker is provided with a sealed container 2. The hermetic container 2 is composed of a grounded metal or insulator, and the inside thereof is filled with an arc extinguishing gas 1 such as SF ₆ gas as an electric insulating medium and an arc extinguishing medium. In the hermetic container 2, the fixing portion 3 is insulated and fixed in the hermetic container 2 via a fixed-side support insulator 7b. The fixed part 3 includes a fixed energizing part 3a and a fixed arc contact 3b. The fixed part 3 is composed of a hollow member, and a fixed-side hot gas processing space 14 is provided therein. An exhaust hole 14 a is formed in the wall surface surrounding the fixed-side hot gas processing space 14.

In the sealed container 2, the movable portion 4 is disposed so as to be able to contact and separate from the fixed portion 3 so as to face the fixed portion 3 on a concentric axis. The movable part 4 is provided so as to be movable along the axial direction of the sealed container 2 and is insulated and supported with respect to the sealed container 2 via a movable support insulator 7a. The movable part 4 includes an insulating nozzle 4a, a movable arc contact 4b, a current-carrying contact 4c, and a puffer cylinder 4d in order from the fixed part 3, and these members are integrally attached to the operation rod 4e. ing.

The fixed portion 3 and the movable portion 4 are configured to contact each other when the pole is closed and to conduct current, and to be able to generate an arc discharge 6 between the fixed arc contact 3b and the movable arc contact 4b at the time of separation. Yes. That is, the fixed arc contact 3b and the movable arc contact 4b are in contact conduction when the circuit breaker is turned on. Moreover, at the time of interruption | blocking operation | movement, while the fixed part 3 and the movable part 4 are separated by relative movement, the arc discharge 6 generate | occur | produces between both the

arc contacts

3b and 4b.

Since the insulating nozzle 4a is exposed to the arc discharge 6, it is often composed mainly of polytetrafluoroethylene, which is an insulator having high arc resistance. A piston 5 for compressing the internal space is attached to the puffer cylinder 4d. A movable part support 12 is attached to the piston 5. The movable part support 12 is fixed in the hermetic container 2 via a movable support insulator 7a. The movable part support 12 is made of a hollow member having a diameter larger than that of the piston 5, and its internal space is a movable-side hot gas treatment space 13.

[Exhaust hole]
As shown in FIGS. 1 to 4, three exhaust holes 17 a to 17 c having different cross-sectional areas are formed in the wall surface portion of the movable portion support 12 surrounding the movable-side hot gas processing space 13. These exhaust holes 17a to 17c are for suppressing an increase in pressure in the movable hot gas processing space 13. Further, in the movable hot gas processing space 13, the space side where the arc discharge 6 is generated is the upstream side of the hot gas 9, the exhaust holes 17a to 17c side is the downstream side of the hot gas 9, and the exhaust holes 17a to 17c are hot gas. 9 is formed such that the cross-sectional area on the downstream side is sequentially smaller than the cross-sectional area on the upstream side. That is, the cross-sectional areas of the exhaust holes 17a to 17c are formed such that the exhaust hole 17a> the exhaust hole 17b> the exhaust hole 17c.

In the gas circuit breaker having the above configuration, the current is drawn to the outside through the conducting conductor 10 and the bushing (not shown). The current-carrying conductor 10 is insulated and supported by the insulating spacer 11, and at the same time, the gas space in the sealed container 2 is divided by the insulating spacer 11. The movability of the movable portion 4 is achieved by connecting the operating rod 4e to the movable portion in the drive device 8 via the insulating rod 15 and the airtight rod 16.

[During shutdown operation]
During the breaking operation of the gas circuit breaker, along with the opening operation by the

arc contacts

3b and 4b, the piston 5 fixed to the sealed container 2 compresses the internal space of the puffer cylinder 4d to increase the pressure in the same part. The arc-extinguishing gas 1 existing in the puffer cylinder 4d becomes a high-pressure gas flow, is rectified by the insulating nozzle 4a, and is strongly blown against the arc discharge 6 generated between the

arc contacts

3b and 4b. . As a result, the conductive arc discharge 6 generated between the

arc contacts

3b and 4b disappears, and the current is interrupted.

The gas sprayed on the arc discharge 6 is heated by the arc discharge 6 to become a hot gas 9 having a high temperature. The hot gas 9 flows separately from the space where the arc discharge 6 is generated to the fixed portion 3 side and the movable portion 4 side. The hot gas 9 that has flowed to the fixed portion 3 side passes through the fixed-side hot gas processing space 14, is cooled, and is diffused into the sealed container 2 through the exhaust holes 17a to 17c. The hot gas 9 that has flowed to the movable portion 4 side passes through the hollow portion of the drive rod 4 e, is cooled in the movable-side hot gas processing space 13 in the movable portion support 12, and is diffused into the sealed container 2. .

(Action and effect)
The operation and effect of the first embodiment will be described with reference to FIGS. FIG. 5 shows an equipotential surface near the exhaust hole according to the first embodiment. 6 and 7 are comparative examples of the first embodiment in which three exhaust holes 19a to 19c having the same cross-sectional area are arranged at equal intervals, and show equipotential surfaces in the vicinity of the exhaust holes in the comparative example. . 6 shows a state before the hot gas 9 is exhausted, and FIGS. 5 and 7 show a state where the hot gas 9 is exhausted.

6 and 7, the cross-sectional areas of the exhaust holes 19a to 19c are all the same from the upstream side to the downstream side of the hot gas 9. In this case, as shown in FIG. 7, the hot gas 9 is not discharged from the upstream exhaust hole 19a, but is concentrated from the downstream exhaust holes 19b and 19c.

Therefore, the hot gas 9 is quickly discharged from the downstream space of the movable-side hot gas processing space 13 and does not stay in the movable-side hot gas processing space 13 for a long time. That is, the hot gas 9 is not sufficiently cooled in the movable hot gas processing space 13. As a result, the hot gas 9 of high temperature flows out from the exhaust holes 19b and 19c, and a high electric field portion 18 (portion surrounded by a thick dotted line) is formed in the vicinity of the exhaust holes 19b and 19c (see FIG. 7).

On the other hand, in the first embodiment, the sectional areas of the exhaust holes 17a to 17c are sequentially reduced from the upstream side to the downstream side of the hot gas 9, so that the movable side hot gas is discharged from the exhaust holes 17a to 17c. The hot gas 9 gradually flows out of the processing space 13. At this time, the exhaust gas amount from the upstream exhaust hole 17a is “large”, the exhaust gas amount from the middle exhaust hole 17b is “medium”, and the exhaust gas amount from the downstream exhaust hole 17c is “small” ( (See FIG. 5).

Therefore, the amount of exhaust gas of the hot gas 9 entering the movable hot gas treatment space 13 decreases toward the downstream space of the movable hot gas treatment space 13 and is discharged from the downstream space of the movable hot gas treatment space 13 at a stretch. It will not be done. As a result, the hot gas 9 can remain in the movable hot gas processing space 13 for a long time. For this reason, the temperature of the hot gas 9 can be reliably cooled in the movable hot gas processing space 13.

As described above, in the first embodiment in which the cross-sectional areas of the exhaust holes 17a to 17c are sequentially reduced from the upstream side to the downstream side, the temperature of the hot gas 9 is sufficiently cooled in the movable hot gas processing space 13. can do. Accordingly, the high electric field portion 18 is hardly formed in the vicinity of the exhaust holes 17a to 17c, and the occurrence of a ground fault can be prevented between the movable portion support 12 on the movable portion 4 side and the sealed container 2. According to the first embodiment, even when the diameter of the sealed container 2 is reduced and the amount of hot gas 9 flowing into the movable-side hot gas processing space 13 is small, excellent shutoff performance is maintained. Is possible. Thereby, the gas circuit breaker which made compactness and interruption | blocking performance compatible can be obtained.

(2) Second embodiment (configuration)
A second embodiment will be described with reference to FIGS. 8 and 9 show equipotential surfaces near the exhaust holes according to the second embodiment, and FIGS. 10 and 11 show equipotential surfaces near the exhaust holes in the comparative example with respect to the second embodiment. Show. 8 and 10 show a state before the hot gas 9 is exhausted, and FIGS. 9 and 11 show a state where the hot gas 9 is exhausted. The basic configuration of the second embodiment is the same as that of the first embodiment, and the same components are denoted by the same reference numerals and description thereof is omitted.

As shown in FIGS. 8 and 9, in the second embodiment, the wall surface of the movable support 12 surrounding the movable-side hot gas processing space 13 has an exhaust for suppressing an increase in pressure in the hot gas processing space 13. A hole 21 is provided. Two exhaust holes 21 are provided facing each other along the circumferential direction of the movable support 12.

A baffle 22 is attached to the inside of the movable support 12 so as to face each exhaust hole 21. The baffle 22 closes the exhaust hole 21 from the inside with a predetermined interval and is installed in parallel with the equipotential surface near the exhaust hole 21. The surface area of the baffle 22 is formed to be approximately the same as the opening area of the exhaust hole 21.

(Action and effect)
The operation and effect of the second embodiment will be described with reference to the comparative examples of FIGS. In the comparative examples of FIGS. 10 and 11, an equipotential surface in the vicinity of the exhaust hole 21 where the baffle 22 is not installed is shown. As shown in FIG. 11, in the comparative example, since the baffle 22 is not installed in the exhaust hole 21, the hot gas 9 is exhausted directly from the exhaust hole 21 toward the inner surface of the sealed container 2 that is the ground fault direction. End up. As a result, the equipotential surface in the vicinity of the exhaust hole 21 is disturbed, the interval between the equipotential surfaces is reduced, and the high electric field portion 18 (portion surrounded by a thick dotted line) is formed.

On the other hand, in the second embodiment, since the baffle 22 is installed near the exhaust hole 21, the baffle 22 closes the exhaust hole 21, so that the hot gas 9 is blocked by the baffle 22 and is not easily exhausted. Moreover, since the baffle 22 is installed in parallel with the equipotential surface near the exhaust hole 21, even if the hot gas 9 is exhausted from the exhaust hole 21, the hot gas 9 flows out in parallel with the equipotential surface. Become.

Therefore, unlike the comparative example shown in FIG. 11, the hot gas 9 does not flow toward the inner surface of the sealed container 2 which is the ground fault direction, and the equipotential surface near the exhaust hole 21 is not disturbed. As a result, the interval between equipotential surfaces is not reduced, and the formation of the high electric field portion 18 can be avoided. According to the second embodiment, it is possible to prevent the occurrence of a ground fault between the movable portion support 12 on the movable portion 4 side and the sealed container 2, and the movable side as in the first embodiment. While reducing the capacity | capacitance of the hot gas processing space 13 and realizing compactization, the outstanding interruption | blocking performance can be maintained.

In the second embodiment, since the hot gas 9 flowing along the baffle 22 collides with the gas flowing out from one end side of the baffle 22 and the gas flowing out from the other end side of the baffle 22, the baffle 22 The hot gas 9 tends to stay on the surface 22. For this reason, the hot gas 9 stays in the movable hot gas processing space 13 for a long time and is cooled. Therefore, the high electric field portion 18 is more difficult to be formed and can reliably prevent the occurrence of a ground fault.

(3) Third embodiment (configuration)
Hereinafter, the third embodiment will be described with reference to FIGS. 12 and 13. 12 and 13 show equipotential surfaces near the exhaust hole according to the third embodiment. FIG. 12 shows a state before exhausting the hot gas 9, and FIG. 13 shows a state where the hot gas 9 is exhausted. . The basic configuration of the third embodiment is the same as that of the first embodiment, and the same components are denoted by the same reference numerals and description thereof is omitted.

As shown in FIGS. 12 and 13, the wall surface of the movable part support 12 is provided with

exhaust holes

24 and 25 that allow the movable-side hot gas treatment space 13 and the space in the sealed container 2 to communicate with each other. These exhaust holes 24 and 25 are opened toward the axial direction of the movable part 4. In the movable side hot gas treatment space 13, the space side where the arc discharge 6 is generated is the upstream side of the hot gas 9, the exhaust holes 24, 25 side is the downstream side of the hot gas 9, and the wall portion of the movable portion support 12 is heated. The radial dimension on the upstream side of the gas 9 is short and the radial dimension on the downstream side is long.

The movable part support 12 having different radial dimensions is specifically composed of a three-stage cylindrical shape. Here, in order from the upstream side of the hot gas 9, the portion with the shortest diameter is the small diameter portion 12a, the portion close to the diameter of the small diameter portion 12a has the long diameter portion, the medium diameter portion 12b, and the longest diameter portion is the large diameter portion 12c. And The exhaust hole 24 is provided in the wall surface portion of the medium diameter portion 12b that is generated from the difference in diameter between the small diameter portion 12a and the medium diameter portion 12b. The exhaust hole 25 is provided in the wall surface portion of the large-diameter portion 12c generated from the difference in diameter between the medium-diameter portion 12b and the large-diameter portion 12c.

(Action and effect)
In the third embodiment, even if the hot gas 9 flows out of the exhaust holes 24 and 25 while maintaining a high temperature, it flows out along the axial direction of the movable part support 12. That is, as shown in FIG. 13, the hot gas 9 flows in parallel with the equipotential surface, and does not flow toward the inner surface direction of the sealed container 2 that is the ground fault direction. Therefore, the high electric field portion 18 is not formed near the exhaust holes 24 and 25.

As a result, it is possible to reliably prevent a ground fault occurring between the movable part support 12 on the movable part 4 side and the sealed container 2. According to the third embodiment, as in the first and second embodiments, even if the capacity of the movable-side hot gas processing space 13 is reduced to achieve a compact size, excellent shut-off performance is achieved. Can be secured.

(4) Other Embodiments Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope of the present invention and the gist thereof, and are also included in the invention described in the claims and the equivalent scope thereof.

(A) The number and shape of the exhaust holes and baffles, the arrangement locations, the constituent materials, and the like can be selected as appropriate. For example, as shown in FIG. 14, four exhaust holes 21 are equally provided at an angle of 90 degrees, and four baffles 22 are provided so as to cover the four exhaust holes 21 correspondingly. good. According to such an embodiment, the amount of the hot gas 9 exhausted from the exhaust holes 21 can be reduced by using four exhaust holes 21 and baffles 22. Thereby, the occurrence of a ground fault between the movable part support 12 on the movable part 4 side and the sealed container 2 can be prevented more reliably. Furthermore, the surface area of the baffle may be larger than the cross-sectional area of the exhaust hole, or the exhaust hole may be closed with a predetermined interval from the outside rather than from the inside.

(B) As a shape of the exhaust hole according to the first embodiment, the cross-sectional area on the downstream side may be smaller than the cross-sectional area on the upstream side of the hot gas 9. Therefore, as a modification of the first embodiment, for example, as shown in FIG. 15, one elongated triangular exhaust hole 17 d may be formed in the axial direction of the movable portion support 12.

Furthermore, in the first embodiment, the exhaust holes 17a to 17c having a small cross-sectional area are arranged from the upstream side to the downstream side of the hot gas 9, but this is not restrictive. For example, as shown in FIG. 16, a plurality of exhaust holes 17e having the same cross-sectional area may be provided so that the number of exhaust holes per unit area decreases sequentially from the upstream side to the downstream side of the hot gas 9. Good. Specifically, six exhaust holes 17e may be disposed on the upstream side of the hot gas 9, two exhaust holes 17e may be disposed on the downstream side, and four exhaust holes 17e may be disposed therebetween.

(C) In any of the above embodiments, the exhaust hole or baffle is provided on the movable-side hot gas treatment space 13 side. However, as shown in FIG. 17, the exhaust hole is provided on the fixed part 3 side on the hot gas treatment space 14 side. 21 may be provided, and the baffle 22 may be provided so as to cover it. Further, an exhaust hole having a downstream cross-sectional area smaller than an upstream cross-sectional area may be provided in a wall surface part surrounding the hot gas processing space 14 on the fixed part 3 side.

(D) In the movable part support 12 of the third embodiment, the radial dimension on the upstream side of the hot gas 9 is shortened and the radial dimension on the downstream side is lengthened. The upstream radial dimension of the gas 9 may be lengthened and the downstream radial dimension may be shortened. For example, as shown in FIG. 18, the large diameter portion 12c, the medium diameter portion 12b, and the small diameter portion 12a may be arranged in this order from the upstream side of the hot gas 9.

In such an embodiment, since the flow rate of the hot gas 9 decreases sequentially from the upstream side to the downstream side, the hot gas 9 flows from the exhaust holes 24 and 25 toward the outside of the movable hot gas processing space 13. It will gradually flow out. At this time, the exhaust gas amount from the upstream exhaust hole 25 tends to be “large”, and the exhaust gas amount from the downstream exhaust hole 24 tends to be “small”.

Therefore, the amount of exhaust gas of the hot gas 9 entering the movable hot gas treatment space 13 decreases toward the downstream space of the movable hot gas treatment space 13 and is discharged from the downstream space of the movable hot gas treatment space 13 at a stretch. It will not be done. As a result, the hot gas 9 can stay in the movable hot gas processing space 13 for a long time. Thereby, the temperature of the hot gas 9 can be reliably cooled in the movable-side hot gas processing space 13, and an excellent blocking performance can be exhibited.

Further, in the movable portion support 12 according to the third embodiment, the small diameter portion 12a and the medium diameter portion 12b are adjacent to each other, and the large diameter portion 12c and the medium diameter portion 12b are adjacent to each other, as shown in FIG. In addition, the end surfaces of the diameter portions 12 a to 12 c may be overlapped in the axial direction of the movable portion 4. In such an embodiment, the exhaust holes 26 and 27 have a predetermined length in the axial direction of the movable portion 4.

The hot gas 9 flowing through the exhaust holes 26 and 27 flows in the opposite direction to the flow of the hot gas 9 flowing through the movable hot gas processing space 13. Therefore, compared with the exhaust holes 24 and 25 having only the opening surfaces, the hot gas 9 is less likely to flow through the exhaust holes 26 and 27 and is not easily discharged therefrom. Accordingly, the hot gas 9 stays in the movable hot gas processing space 13 for a long time and is easily cooled, and the formation of the high electric field portion 18 can be avoided to reliably prevent the occurrence of a ground fault.

In the above-described embodiment, the fixed portion is expressed, but a so-called dual motion mechanism that improves the relative opening speed by driving the opposing contact portion to the side opposite to the movable contact portion in the sealed container. It can also be applied to gas breakers of the type using Moreover, it is possible to apply embodiment of this invention to gas circuit breakers other than a puffer type, and what combined said embodiment is also included by embodiment of this invention.

DESCRIPTION OF SYMBOLS 1 ... Arc extinguishing gas 2 ... Sealed container 3 ... Fixed part 3a ... Fixed electricity supply part 3b ... Fixed arc contact 4 ... Movable part 4a ... Insulation nozzle 4b ... Moveable arc contact 4c ... Current supply contact 4d ... Puffer cylinder 4e ... Operating rod 5 ... Piston 6 ... Arc discharge 7a ... Fixed side support insulator 7b ... Moving side support insulator 8 ... Drive device 9 ... Hot gas 10 ... Conducting conductor 11 ... Insulating spacer 12 ... Moving part support 12a ... Small diameter part 12b ... Medium diameter part 12c ... Large diameter part 13 ... Movable side hot gas treatment space 14 ... Fixed side hot gas treatment space 15 ... Insulating rod 16 ... Airtight rods 17a to 17d, 19, 21, 24, 25, 26, 27 ... Exhaust holes 18 ... High electric field part 22 ... Baffle

Claims

A sealed container filled with arc-extinguishing gas;
A fixed part and a movable part that are arranged concentrically facing each other in the sealed container and are detachable from each other; and
A fixed arc contact and a fixed energized contact provided in the fixed part;
A movable arc contact and a movable energized contact provided in the movable part;
An arc discharge space in which hot gas can be generated by arc discharge between the fixed arc contactor and the movable arc contactor when the fixed part and the movable part are separated;
A hot gas treatment space provided in at least one of the fixed part and the movable part so as to take in the hot gas from the arc discharge space;
A wall surface surrounding the hot gas treatment space;
An exhaust hole formed in the wall surface portion and communicating the hot gas treatment space and the space in the sealed container;
With
In the hot gas processing space, the arc discharge space side is the upstream side of the hot gas, the exhaust hole side is the downstream side of the hot gas, and the exhaust hole is downstream of the cross-sectional area on the upstream side of the hot gas. A gas circuit breaker characterized by having a smaller cross-sectional area.
The exhaust hole is composed of a plurality of exhaust holes having different cross-sectional areas,
2. The gas circuit breaker according to claim 1, wherein the exhaust hole is arranged so that a cross-sectional area decreases from an upstream side to a downstream side of the hot gas.
The exhaust hole is composed of a plurality of exhaust holes having the same cross-sectional area,
2. The gas circuit breaker according to claim 1, wherein the exhaust holes are arranged so that the number of exhaust holes per unit area decreases sequentially from the upstream side to the downstream side of the hot gas.
A sealed container filled with arc-extinguishing gas;
A fixed part and a movable part that are arranged concentrically facing each other in the sealed container and are detachable from each other; and
A fixed arc contact and a fixed energized contact provided in the fixed part;
A movable arc contact and a movable energized contact provided in the movable part;
An arc discharge space in which hot gas can be generated by arc discharge between the fixed arc contactor and the movable arc contactor when the fixed part and the movable part are separated;
A hot gas treatment space that is provided in at least one of the fixed portion and the movable portion and takes in the hot gas from the arc discharge space; and
A wall surface surrounding the hot gas treatment space;
An exhaust hole formed in the wall surface portion and communicating the hot gas treatment space and the space in the sealed container;
A baffle that closes the exhaust hole with a predetermined interval and is installed in parallel with the equipotential surface near the exhaust hole;
A gas circuit breaker comprising:
The gas circuit breaker according to claim 4, wherein a surface area of the baffle is larger than an opening area of the exhaust hole.
A sealed container filled with arc-extinguishing gas;
A fixed part and a movable part that are arranged concentrically facing each other in the sealed container and are detachable from each other; and
A fixed arc contact and a fixed energized contact provided in the fixed part;
A movable arc contact and a movable energized contact provided in the movable part;
An arc discharge space in which hot gas can be generated by arc discharge between the fixed arc contactor and the movable arc contactor when the fixed part and the movable part are separated;
A hot gas treatment space provided in at least one of the fixed part and the movable part so as to take in the hot gas from the arc discharge space;
A wall surface surrounding the hot gas treatment space;
An exhaust hole formed in the wall surface portion and communicating the hot gas treatment space and the space in the sealed container;
With
The gas circuit breaker, wherein the exhaust hole is opened in an axial direction of the fixed part or the movable part.
In the hot gas processing space, the arc discharge space side is the upstream side of the hot gas, the exhaust hole side is the downstream side of the hot gas, and the wall portion has a short radial dimension on the upstream side of the hot gas. The gas circuit breaker according to claim 6, wherein the downstream radial dimension is increased.
In the hot gas processing space, the arc discharge space side is the upstream side of the hot gas, the exhaust hole side is the downstream side of the hot gas, and the wall portion has a longer radial dimension on the upstream side of the hot gas. The gas circuit breaker according to claim 6, wherein a downstream radial dimension is shortened.
The wall surface portion is provided adjacent to portions having different radial dimensions,
The gas circuit breaker according to any one of claims 6 to 8, wherein end surfaces of portions having different radial dimensions are overlapped in an axial direction of the fixed portion or the movable portion.
A puffer cylinder driven integrally with the movable part;
A piston that compresses the internal space of the puffer cylinder;
A movable part support attached to the piston and fixed in the sealed container,
The gas circuit breaker according to any one of claims 1 to 9, wherein the hot gas processing space is provided in an internal space of the movable part support.
A fixing portion support for fixing the fixing portion in the sealed container;
The gas circuit breaker according to any one of claims 1 to 10, wherein the hot gas processing space is provided in an internal space of the fixed portion support.