KR20170058637A - Bellows unit for fault current circuit breaker and circuit breaker using it - Google Patents

Bellows unit for fault current circuit breaker and circuit breaker using it Download PDF

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Publication number
KR20170058637A
KR20170058637A KR1020150162462A KR20150162462A KR20170058637A KR 20170058637 A KR20170058637 A KR 20170058637A KR 1020150162462 A KR1020150162462 A KR 1020150162462A KR 20150162462 A KR20150162462 A KR 20150162462A KR 20170058637 A KR20170058637 A KR 20170058637A
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KR
South Korea
Prior art keywords
bellows
space
inner chamber
pressure
circuit breaker
Prior art date
Application number
KR1020150162462A
Other languages
Korean (ko)
Inventor
오연호
손채화
송기동
Original Assignee
한국전기연구원
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Priority to KR1020150162462A priority Critical patent/KR20170058637A/en
Publication of KR20170058637A publication Critical patent/KR20170058637A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66238—Specific bellows details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66238—Specific bellows details
    • H01H2033/66246—Details relating to the guiding of the contact rod in vacuum switch belows

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  • Gas-Insulated Switchgears (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)

Abstract

The present invention relates to a bellows used in a circuit breaker for blocking a fault current and a circuit breaker using the same. The bellows for a fault current breaker comprises a first bellows connecting an inner chamber and a movable rod; a second bellows surrounding the first bellows to form a first space with the first bellows; and a gas supply part for supplying gas into a compression space and the first space through the inner chamber and an outer chamber surrounding the inner chamber to form the compression space. Thus, by providing a plurality of bellows to form the first space, it is possible to reduce a difference between the inner and outer pressure of each bellows, thereby preventing breakage of the bellows.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bellows unit for a fault current breaker and a circuit breaker using the bellows unit.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bellows unit used in a circuit breaker for blocking a fault current and a circuit breaker using the bellows unit.

In the event of a fault in the power system or a high voltage current, a current interrupter is used to shut down the fault current and protect the power plant. The current interrupting device cuts off the current when a fault current which flows to the power system reaches 10 times or more of the normal current due to a failure or an accident in the power system.

The vacuum circuit breaker, which is one of these current interrupters, has a fixed contact and a movable contact in the inner and outer chambers and the inner chamber, so that the arc between two contacts occurring in the interrupting operation is eliminated to quickly isolate the circuit. At this time, the inside of the outer chamber is vacuumed with respect to the inner chamber, and the outside is filled with sulfur hexafluoride (SF 6 ).

1, the conventional vacuum circuit breaker includes an inner chamber 10 having an inner vacuum, an outer chamber 15 surrounding the inner chamber and filled with sulfur hexafluoride, a fixed contact (not shown) inside the inner chamber A movable contact 31 provided so as to face the fixed contact 21; an actuator 60 for driving the movable contact 31 to be spaced apart from the fixed contact 21; And a bellows 40 for sealing the outer chambers 10, 15.

The bellows 40 can maintain the vacuum of the inner chamber because the bellows 40 seals the inner and outer chambers 10 and 15 even if the movable contact 31 moves within a certain range.

However, in this configuration, since the inside of the inner chamber 10 is vacuum and the outside is filled with sulfur hexafluoride at a certain pressure, the bellows 40 is stressed by the difference between the internal and external pressures, and the pressure difference exceeds a certain level There is a problem that the bellows 40 may be broken.

Recently, the use of sulfur hexafluoride has been reduced due to global warming problems, and the use of vacuum circuit breakers using dry air instead of sulfur hexafluoride has been increasing. However, the dry air has a lower insulation performance than sulfur hexafluoride and generally has to be filled with a pressure higher than 3 bar. Therefore, the bellows having elasticity is torn or broken, and breakage of the bellows has a problem of breaking the vacuum in the chamber or leakage of the insulating material, thereby reducing the insulation performance of the circuit breaker.

To solve this problem, according to Korean Patent Publication No. 10-107708, which is a conventional vacuum circuit breaker, a movable contact inside an inner chamber is connected in series with a conductor pile, and a lower conductor pile is connected in series with an insulator , And a bellows is provided on the side of the movable contact. Therefore, the space between the bellows and the movable contact, the inner space of the conductor pile, and the inner space of the insulator are communicated and at atmospheric pressure, and the outer space of the bellows communicates with the inner chamber and is in a vacuum state. Thus reducing the stress on the bellows.

However, such a vacuum circuit breaker has a problem in that the structure for maintaining the atmospheric pressure is complicated and difficult to assemble. In addition, there are disadvantages that atmospheric pressure sealing is difficult because there are many joining parts to be sealed to maintain atmospheric pressure.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bellows for a circuit breaker which prevents breakage of the bellows by internal and external pressure differences.

It is also an object of the present invention to provide a bellows for a circuit breaker which is not complicated in configuration while reducing the difference between the internal and external pressure of the bellows.

In order to solve the above-mentioned problems, the bellows unit for a fault current interrupter according to the present invention is characterized in that a bellows unit for a fault current interrupter has one end connected to an inner chamber arranged inside the stationary contact and a movable contact, and the other end connected to the movable rod A bellows unit for a fault current interrupter sealing an inner chamber, the bellows unit comprising: a first bellows connecting the inner chamber and the movable rod; A second bellows surrounding the first bellows to form a first space with the first bellows; And a gas supply unit for supplying a gas to the compression space and the first space through an outer chamber enclosing the inner chamber to form a compression space with the inner chamber; .

A third bellows surrounding the second bellows to form a second space with the second bellows; .

Preferably, the pressure measuring unit is connected to the first space and measures a pressure change of the first space. .

Preferably, the material of the first and second bellows is made of metal.

Preferably, the pressure of the first space is set to a value between the pressure of the compression space and the inner pressure of the inner chamber, thereby reducing the inner and outer pressure differences of the first and second bellows.

According to another aspect of the present invention, there is provided a circuit breaker using a bellows unit, the circuit breaker comprising: an inner chamber filled with a vacuum or insulating gas; A fixed contact provided in the inner chamber; A movable contact disposed in the inner chamber so as to face the fixed contact; A movable contact actuator for driving the movable rod of the movable contact so that the movable contact moves away from or closer to the fixed contact; A first bellows connecting the inner chamber and the movable rod; A second bellows surrounding the first bellows to form a first space with the first bellows; An outer chamber surrounding the inner chamber to form a compression space with the inner chamber; And at least one gas supply unit for supplying gas into the compression space and the first space through the outer chamber; .

Preferably, the pressure in the first space has a value between the inner pressure of the inner chamber and the pressure in the compression space.

Preferably, the pressure of the first space is set to 10% of the internal pressure of the inner chamber and the pressure average value of the compression space.

Preferably, the interior of the inner chamber is vacuum, the compression space is at least 3 bar, and the pressure of the first space is set at less than 3 bar.

In the bellows for a fault current interrupter according to the present invention, a plurality of bellows are provided so as to form the first space, so that the difference in pressure between the bellows and the outer bellows can be reduced, thereby preventing breakage of the bellows.

In addition, the present invention reduces the difference between the inner and outer pressure of each bellows while using the conventional bellows, so that the difference in the inner and outer pressures of the inner chamber can withstand a larger pressure difference.

Further, since the present invention includes a plurality of conventional bellows, its configuration is simple and easy to assemble.

1 is a schematic view of a conventional breaker using a single bellows;
2 is a schematic view of a circuit breaker according to a first embodiment of the present invention;
3 is a schematic view showing another state of the circuit breaker according to the first embodiment of the present invention.
4 is a schematic view of a circuit breaker according to a second embodiment of the present invention;

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Also, the terms used in the present invention are used to describe specific embodiments and are not intended to limit the present invention, and the singular expressions include plural expressions unless the context clearly indicates otherwise. In the description, the same parts as those of the conventional art are partially explained.

The bellows for a fault current interrupter of the present invention is a bellows used in a circuit breaker for energizing or breaking a current, and can be classified into the first and second embodiments. The constituent elements of the embodiments are basically the same, There is a difference. In addition, among the various embodiments of the present invention, the same reference numerals in the drawings denote the same components and components that perform the same functions and functions.

2 and 3, the bellows for a fault current interrupter according to the first embodiment of the present invention includes an inner chamber 10, an outer chamber 15, a fixed contact 21, a movable contact 31, A first bellows 40, a second bellows 50, an actuator 60, a pressure measuring unit 70, and a gas supply unit 80.

The inner chamber 10 is formed in a vacuum state in the inner space 11, and the fixed contact 21 and the movable contact 31 are disposed so as to face each other.

The outer chamber 15 surrounds the inner chamber 10 to form the inner chamber 10 and the compression space 16 and is spaced apart from the inner chamber 10.

The fixed contact 21 is provided inside the inner chamber 10 and is exposed to the outside of the inner chamber 10 by the fixed rod 22 and connected to the external current.

The movable contact 31 is provided inside the inner chamber 10 so as to face the fixed contact 21 and is exposed to the outside of the inner chamber 10 by the movable rod 32 and connected to the external current. As the movable rod 32 is moved by the actuator 60, the movable contact 31 is separated from or approach the stationary contact 21.

Specifically, the stationary contact 21 is disposed inside the inner chamber 10, and the stationary rod 22 of the stationary contact 21 is exposed to the outside of the inner chamber 10 to draw in the electric current. The movable contact 31 is separated or approaches within the fixed contact 21 and the inner chamber 10 and the movable rod 32 of the movable contact 31 is exposed to the outside of the inner chamber 10, And is connected to the manipulator (60).

As a result, the current drawn from the outside of the inner chamber 10 through the fixed contact 21 is drawn out through the movable contact 31. However, the current direction may be reversed so that the current drawn from the inner chamber 10 through the movable contact 31 is drawn out through the fixed contact 21.

In order to cut off the circuit in the energized state, the movable contact 31 is moved in a state where the fixed contact 21 is fixed. At this time, since the fixed contact 21 and the inner chamber 10 are fixed, they are sealed by the sealing member 23, and the movable contact 21 and the inner chamber 10 move relative to each other, Thereby maintaining the vacuum state in the inner chamber 100.

The bellows unit has one end connected to the inner chamber 10 and the other end connected to the movable rod 32 to seal the inner chamber 10. The bellows unit includes the first and second bellows 40 and 50.

The first bellows 40 is provided to connect the inner chamber 10 and the movable rod 32. The second bellows 50 surrounds the first bellows 40 and the first bellows 40 and the first bellows 40 communicate with the first bellows 40, (41).

At this time, the material of the first and second bellows 40 and 50 is made of metal, so that the deformation of the bellows due to the difference in the pressure inside and outside the bellows can be prevented.

Both ends of the bellows 40 and 50 can be coupled to the inner chamber 10 and the movable rod 32 by brazing. This makes it possible to join even if the inner chamber 10 and the bellows are made of different materials, and it is easy to seal the inner chamber 10 because there is no leakage on the bonding surface.

The pressure of the first space 41 is set to a value between the pressure of the compression space 16 and the internal pressure of the inner chamber 10. [ Therefore, it has a high pressure value in the order of the inner pressure of the inner chamber 10, the pressure of the first space 41, and the pressure of the compression space 16. This reduces the difference between the internal and external pressures of the first and second bellows 40, 50, respectively.

For example, the inner pressure of the inner chamber 10 is formed by vacuum, the pressure of the compression space 16 is set to 3 bar, and the pressure of the first space 41 is set to 2 bar. Therefore, the difference between the internal and external pressures of the first bellows 40 is 2 bar, the difference between the internal and external pressures of the second bellows 40 is 1 bar, and in the case of the conventional single bellows, the difference between the internal and external pressures of the bellows is 3 bar . Thus, by constituting the bellows unit with the first and second bellows 40 and 50, the stress due to the pressure difference applied to each bellows is reduced.

Particularly when the pressure in the first space 41 is set to be within 10% of the internal pressure of the inner chamber 10 and the pressure average value in the compression space 16, the pressure in the first space 41 is applied to the first and second bellows 40 and 50 It is possible to prevent stress from being concentrated on any one of the bellows. In addition, the bellows unit of the present invention can withstand a pressure difference of about 2 times as compared with a conventional single bellows.

The manipulator 60 drives the movable contact 31 to move so as to energize or interrupt the current. Thereby, the movable contact 31 can be spaced apart or approach the stationary contact 21. The movable contact 31 is brought into contact with the stationary contact 21 at the time of approach so as not to be drawn out of the inner chamber 10 at the time of separation.

One or more gas supply units 80 are provided and supply gas to the first space 41 and the compression space 16 through the outer chamber 15. At this time, the gas used as the insulating gas may be sulfur hexafluoride, dry air, supercritical fluid, or the like.

The gas supply unit 80 comprises a compression space gas supply unit 81 for supplying gas to the compression space 16 and a first space gas supply unit 82 for supplying gas to the first space 41.

The first space gas supply unit 82 supplies gas to the first space 41 and then the compressed space gas supply unit 81 supplies the compressed space 16 with the gas. This can facilitate gas injection by supplying gas from a space set at a lower pressure. Generally, the pressure of the compression space 16 is set to 3 bar or more, and the pressure of the first space 41 is set to be less than 3 bar.

Although not shown in the drawing, gas may be supplied to each of the compression space and the first space from one gas supply unit.

The pressure measuring unit 70 measures the pressure in the first space 41 and senses the pressure change. When the measured pressure of the first space 41 is significantly different from the set pressure, the first space gas supply unit 82 injects or discharges the gas so that the pressure of the first space 41 reaches the set pressure.

The second embodiment of the present invention differs from the first embodiment in the configuration of the bellows unit. Hereinafter, components different from the first embodiment will be described with reference to FIG.

The bellows unit is composed of first, second, and third bellows (40, 50, 90).

The third bellows 90 surrounds the second bellows 50 and is spaced apart from the second bellows 50 to form a second space 51. The third bellows 90 may be made of a metal such as the first and second bellows 40 and 50 to prevent the shape of the bellows from being deformed due to a difference in external and internal pressure in the bellows.

Both ends of the third bellows 90 can be coupled with the inner chamber 10 and the movable rod 32 by brazing. This makes it possible to join even if the inner chamber 10 and the bellows are made of different materials, and it is easy to seal the inner chamber 10 because there is no leakage on the bonding surface.

The pressure in the second space 51 is set to a value between the pressure in the compression space 16 and the pressure in the first space 41. Therefore, it has a high pressure value in the order of the inner pressure of the inner chamber 10, the pressure of the first space 41, the pressure of the second space 52, and the pressure of the compression space 16. This reduces the internal and external pressure differentials of each of the first, second, and third bellows 40, 50, 90.

For example, the internal pressure of the inner chamber 10 is set to a vacuum, and the first space 41 is set at 1 bar, the second space 42 is set at 2 bar, and the compression space 16 is set at a pressure of 3 bar. Therefore, the inner and outer pressure differences of the first, second and third bellows 40, 50 and 90 are respectively 1 bar, whereas in the case of the conventional single bellows, the inner and outer pressure difference of the bellows is 3 bar. Thus, by constituting the bellows unit with the first, second, and third bellows (40, 50, 90), the stress due to the pressure difference applied to each bellows is reduced.

In addition, the bellows unit of the present invention can withstand a pressure difference of about 3 times as compared to a conventional single bellows.

The gas supply part 80 further includes a second space gas supply part 83 for supplying a gas to the second space 52 through the outer chamber 15. [

The gas supply unit 80 supplies the gas to the first space 41 by the first space gas supply unit 82 and then supplies the gas to the second space 51 by the second space gas supply unit 83, Finally, the compression space gas supply part 81 supplies gas to the compression space 16. This can facilitate gas injection by supplying gas from a space set at a lower pressure.

Although not shown in the drawing, gas may be supplied to each of the compression space, the first space, and the second space from one gas supply portion.

The pressure measuring unit 70 measures the pressure of the first and second spaces 41 and 51 and senses a pressure change in each space. When the measured pressures of the first and second spaces 41 and 51 are largely different from the set pressures, the respective gas supply portions 82 and 83 cause the pressures of the spaces 41 and 51 to reach the set pressures Gas is injected or discharged.

The pressure measuring unit 70 may directly measure the pressure from the respective spaces 41 and 51 and the first and second space gas supplying units 82 and 83 may be connected to the first and second spaces 41 and 51 Pressure can also be measured from the piping.

While the invention has been shown and described with reference to certain embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: inner chamber
15: outer chamber
21: Fixed contact
31: movable contact
40: first bellows
50: second bellows
60:
70: Pressure measuring section
80: gas supply unit
90: Third bellows

Claims (9)

A bellows unit for a fault current interrupter, the bellows unit having one end connected to an inner chamber disposed with a fixed contact and a movable contact facing each other, and the other end connected to a movable rod of the movable contact to seal the inner chamber,
A first bellows connecting the inner chamber and the movable rod;
A second bellows surrounding the first bellows to form a first space with the first bellows; And
A gas supply unit for supplying gas to the compression space and the first space through an outer chamber enclosing the inner chamber to form a compression space with the inner chamber; And the bellows unit. The method according to claim 1,
A third bellows surrounding the second bellows to form a second space with the second bellows; Wherein the bellows unit further comprises: The method according to claim 1,
A pressure measuring unit connected to the first space to measure a pressure change in the first space; Wherein the bellows unit further comprises: The method according to claim 1,
Wherein the material of the first and second bellows is a metal. The method according to claim 1,
Wherein the pressure of the first space is set to a value between a pressure of the compression space and an internal pressure of the inner chamber to reduce the inner and outer pressure differences of the first and second bellows. 1. A circuit breaker for shutting down a fault current,
An inner chamber in which the interior is filled with vacuum or insulating gas;
A fixed contact provided in the inner chamber;
A movable contact disposed in the inner chamber so as to face the fixed contact;
A movable contact actuator for driving the movable rod of the movable contact so that the movable contact moves away from or closer to the fixed contact;
A first bellows connecting the inner chamber and the movable rod; And
A second bellows surrounding the first bellows to form a first space with the first bellows;
An outer chamber surrounding the inner chamber to form a compression space with the inner chamber; And
At least one gas supply unit for supplying gas into the compression space and the first space through the outer chamber; And a circuit breaker. The method of claim 6,
Wherein the pressure of the first space has a value between an internal pressure of the inner chamber and a pressure of the compression space. The method of claim 6,
Wherein the pressure in the first space is +/- 10% of an internal pressure of the inner chamber and an average pressure value of the compression space. The method of claim 6,
Wherein the interior of the inner chamber is vacuum, the compression space is at least 3 bar, and the pressure in the first space is less than 3 bar.
KR1020150162462A 2015-11-19 2015-11-19 Bellows unit for fault current circuit breaker and circuit breaker using it KR20170058637A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110416021A (en) * 2019-06-14 2019-11-05 平高集团有限公司 Arc extinguishing chamber bellows and vacuum interrupter
CN111492453A (en) * 2017-12-21 2020-08-04 西门子股份公司 Drive rod with compensation element
CN112951648A (en) * 2021-02-03 2021-06-11 国网陕西省电力公司电力科学研究院 Multilayer metal corrugated pipe used in vacuum arc-extinguishing chamber
KR102318987B1 (en) * 2020-11-10 2021-10-29 주식회사 비츠로이엠 Vacuum interrupter assembly with vacuum degree monitoring function
KR20240051541A (en) 2022-10-13 2024-04-22 효성중공업 주식회사 Vacuum circuit breaker

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111492453A (en) * 2017-12-21 2020-08-04 西门子股份公司 Drive rod with compensation element
CN110416021A (en) * 2019-06-14 2019-11-05 平高集团有限公司 Arc extinguishing chamber bellows and vacuum interrupter
KR102318987B1 (en) * 2020-11-10 2021-10-29 주식회사 비츠로이엠 Vacuum interrupter assembly with vacuum degree monitoring function
CN112951648A (en) * 2021-02-03 2021-06-11 国网陕西省电力公司电力科学研究院 Multilayer metal corrugated pipe used in vacuum arc-extinguishing chamber
KR20240051541A (en) 2022-10-13 2024-04-22 효성중공업 주식회사 Vacuum circuit breaker

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