WO2019117617A1

WO2019117617A1 - Gas circuit breaker

Info

Publication number: WO2019117617A1
Application number: PCT/KR2018/015758
Authority: WO
Inventors: 정호중; 김명후; 최병화; 김경회; 강민철; 황동익
Original assignee: 일진전기 주식회사
Priority date: 2017-12-14
Filing date: 2018-12-12
Publication date: 2019-06-20
Also published as: KR101983621B1

Abstract

A gas circuit breaker according to the present invention comprises: a cylinder part having a compression chamber and an expansion chamber; a moving part provided so as to be movable inside the cylinder part and dividing the compression chamber and the expansion chamber; a fluid regulating part provided at the moving part so as to be openable and closable and regulating the flow of fluid from the compression chamber toward the expansion chamber; and a piston part facing the moving part and disposed inside the cylinder part.

Description

Gas shutoff device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas barrier device, and more particularly, to a gas barrier device capable of improving a pressure increasing effect and a cooling performance.

In general, when a power system fails, a breaker is used to shut down the fault current and protect the power plant. In an ultra high voltage circuit breaker, the principle for extinguishing an arc generated between two electrical contacts by a fault current is as follows.

When an arc occurs due to a fault current in the state where the insulated gas is filled with high pressure in the breaker, the arc is extinguished by directly injecting the insulated gas into the arc by compressing it to a very high pressure.

SF6 (sulfur hexafluoride) gas is widely used as an insulating gas here, and it has a high dielectric breakdown strength because it has a chemically very stable molecular structure. Because of this characteristic, SF6 insulated gas is widely used as insulation medium of high-voltage equipment, and arc extinguishing arc discharge performance is excellent, and it is widely used as arc extinguishing medium of circuit breaker.

SF6 gas circuit breaker is used for fault current interruption and protection of power system equipment in case of failure in most ultra high voltage power system. PUFFER TYPE And SELF-BLAST TYPE.

Particularly, the gas circuit breaker includes two chambers such as a compression chamber and a thermal expansion chamber and uses a compression chamber and a thermal expansion chamber provided inside the circuit breaker to extinguish an arc caused by a fault current.

Generally, the compression chamber of the gas circuit breaker is used for the small current interruption, and the thermal expansion chamber of the gas circuit breaker is used for the large current interruption.

There has been a problem that the separation wall separating the compression chamber and the thermal expansion chamber is fixed and the volume of the expansion chamber is constant and there is a limit to increase of pressure for arc extinguishing.

BACKGROUND ART [0002] The background art of the present invention is disclosed in Korean Patent Registration No. 10-1701818 (Registered on Jul. 201, 201, entitled "Composite Loop Type Gas Circuit Breaker").

SUMMARY OF THE INVENTION It is an object of the present invention to provide a gas shielding device in which a moving part is movably installed inside a cylinder part so that a pressure rising effect and a cooling performance can be improved.

A gas shutoff apparatus according to the present invention comprises: a cylinder portion in which a compression chamber and an expansion chamber are formed; A moving part movably installed inside the cylinder part and partitioning the compression chamber and the expansion chamber; A fluid regulating unit that is openably and closably provided in the moving unit and regulates the flow of the fluid from the compression chamber to the expansion chamber; And a piston portion facing the moving portion and disposed inside the cylinder portion.

In the present invention, the fluid regulating section controls the fluid to flow only from the compression chamber to the expansion chamber side.

The present invention further includes a supporting wall portion connecting the inner wall portion of the cylinder portion and supporting the cylinder portion.

In the present invention, the support wall portion is disposed between the piston portion and the moving portion.

According to the present invention, there is further provided a pressing part which is coupled to the piston part and passes through the supporting wall part to press the moving part.

In the present invention, the piston portion is disposed between the supporting wall portion and the moving portion.

In the present invention, the inner wall of the cylinder portion is formed with a stopper portion protruding from the moving path of the moving portion so as to restrict movement of the moving portion toward the piston portion.

The gas shielding device according to the present invention has an effect that the pressure of the fluid in the expansion chamber is further raised because the movable portion is provided movably inside the cylinder portion.

Further, the moving part is moved inside the cylinder part and the cooling performance is improved by mixing with the high temperature heat gas flowing into the expansion chamber by the pressure rise of the fluid in the expansion chamber.

Further, since the support wall portion connects the inner wall portion of the cylinder portion, the bearing force of the cylinder portion moving relative to the piston portion is improved.

Further, the pressing portion pressurizes the moving portion and further increases the fluid pressure inside the expansion chamber.

In addition, there is an effect of restricting the moving distance of the moving part moved toward the piston part due to the stopper part.

1 is a side sectional view showing a gas barrier device according to an embodiment of the present invention.

2 is a side cross-sectional view showing a state in which the fluid regulating portion is opened according to an embodiment of the present invention.

3 is a side cross-sectional view illustrating a state in which the pressing portion presses the moving portion according to the embodiment of the present invention.

4 is a side cross-sectional view illustrating a gas barrier device according to another embodiment of the present invention.

5 is a side cross-sectional view showing a state in which the fluid regulating portion is opened in the gas barrier device according to another embodiment of the present invention.

6 is a side cross-sectional view showing a state in which the piston portion presses the moving portion in the gas barrier device according to another embodiment of the present invention.

Hereinafter, embodiments of a gas barrier device according to the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a side sectional view showing a gas barrier device according to an embodiment of the present invention. 2 is a side cross-sectional view showing a state in which the fluid regulating portion is opened according to an embodiment of the present invention. 3 is a side cross-sectional view illustrating a state in which the pressing portion presses the moving portion according to the embodiment of the present invention.

1 to 3, a gas barrier device 1 according to an embodiment of the present invention includes a cylinder part 100, a moving part 200, a fluid regulating part 300, a piston part 400, A wall portion 500, and a pressing portion 600.

1 to 3, in an embodiment of the present invention, the gas barrier device 1 has a symmetrical structure with the X axis as a rotation center axis, and the configuration of one side (lower reference in FIG. 1) (The upper side in Fig. 1) with respect to the axis, so the drawing is omitted in the overlapping range.

Referring to FIG. 1, a compression chamber 110 and an expansion chamber 150 are formed in a cylinder portion 100 according to an embodiment of the present invention. A supporting wall portion 500 to be described later is fixedly positioned on the inner side surface of the cylinder portion 100.

Referring to FIGS. 1 to 3, a piston unit 400 to be described later is disposed inside the cylinder unit 100. The position of the piston 400 is fixed, and the cylinder 100 moves in the left and right directions (refer to FIG. 1).

As a result, when the distance between the piston 400 and the moving part 200 is shortened, the pressure of the fluid G in the compression chamber 110, specifically, the insulation gas such as SF6 is increased, The fluid G flows into the expansion chamber 150 through the fluid regulator 300, which will be described later, in the compression chamber 110.

1 to 3, the compression chamber 110 formed in the cylinder part 100 includes a piston part 400, an inner wall part 101 of the opposing cylinder part 100, a moving part 200, Is formed in a space shape by the wall portion (500).

The movable arc contact 20 according to an embodiment of the present invention is coupled to the cylinder portion 100 and connected to the front end (reference left side) side of the fixed arc contact 10 through the front end (reference right side) .

In this specification, the connection and support structure on the rear end side of the fixed arc contact 10, the moving structure of the cylinder part 100, and the movement method are the same as those of the conventional gas shutoff device, and thus a detailed description thereof will be omitted.

1 to 3, the inflating chamber 150 according to an embodiment of the present invention includes a high-temperature fluid G generated between a gap, specifically between a fixed arc contact 10 and a movable arc contact 20, Respectively.

In the expansion chamber 150 according to an embodiment of the present invention, the high temperature fluid G generated between the fixed arc contact 10 and the movable arc contact 20 and the fluid control part 300 in the compression chamber 110, Is mixed with the fluid G to cool the high temperature fluid (G).

1 to 3, a moving part 200 according to an embodiment of the present invention is installed movably inside a cylinder part 100 and includes a compression chamber 110 and an expansion chamber 150 It divides.

The compression chamber 110 is formed on the left side of the moving part 200 (refer to FIG. 1) inside the cylinder part 100 due to the moving part 200 according to the embodiment of the present invention, The expanding chamber 150 is formed on the right side (refer to FIG. 1).

The fluid G is filled in the compression chamber 110 and the expansion chamber 150 according to an embodiment of the present invention. Specifically, the fluid G may be formed of SF6 gas as an insulation gas.

The moving part 200 is installed inside the cylinder part 100 and contacts the inner wall part 101 of the cylinder part 100 facing the cylinder part 100. The compression chamber 110 and the expansion chamber 150 are thereby partitioned , The piston (400) compresses the fluid (G) in the compression chamber (110) and the pressure is increased.

The moving part 200 moves the piston part 400 by the pressure of the fluid G in the compression chamber 110 after a predetermined time after the fluid G in the compression chamber 110 is compressed by the piston part 400. [ (Left to right in FIG. 1).

The piston 400 continuously pressurizes the fluid G in the compression chamber 110 and pressurizes the fluid G flowing into the expansion chamber 150 from the compression chamber 110 through the fluid regulator 300, ) Can be further increased.

In addition, since the pressure of the fluid G is further elevated compared to the position where the moving part 200 is fixed through the fluid regulating part 300, the high-pressure fluid G flows into the inflating chamber 150 (G) having an increased temperature due to an arc generated when the stationary arc contact 10 and the movable arc contact 20 are separated from each other. Thus, the cooling performance is improved.

Referring to FIGS. 1 to 3, a fluid regulating unit 300 to be described later is installed in the moving unit 200 according to an embodiment of the present invention.

1 to 3, the fluid regulating part 300 according to an embodiment of the present invention is installed in the moving part 200 so as to be openable and closable. The fluid regulating part 300 moves from the compression chamber 110 to the expansion chamber 150 The flow of the fluid G is controlled.

2, the fluid regulator 300 controls the flow of the fluid G such that the fluid G flows only from the compression chamber 110 to the expansion chamber 150 side (from the left to the right in FIG. 2) do.

When the pressure of the fluid G in the compression chamber 110 reaches the set value and the pressure inside the compression chamber 110 becomes larger than the pressure of the expansion chamber 150, the fluid regulator 300 is opened The fluid G flows from the compression chamber 110 toward the expansion chamber 150 side.

In the present invention, the opening and closing of the fluid regulating unit 300 is controlled according to the pressure value of the fluid G in the compression chamber 110. However, the present invention is not limited thereto, and the fluid regulating unit 300 may be opened Various modifications are possible.

In addition, since the pressure of the fluid G in the compression chamber 110 is greater than the pressure of the fluid G in the expansion chamber 150, the fluid G flows from the expansion chamber 150 to the compression chamber 110 There is an effect that can be blocked.

The fluid regulator 300 according to an embodiment of the present invention may be formed in a valve manner. Specifically, the fluid regulating unit 300 may be formed of a pressure reducing valve and a relief valve.

A configuration in which the fluid regulating unit 300 is opened and closed when the set pressure value is reached by the elastic restoring force of the elastic member such as a spring is a general driving method of the relief valve, and a detailed description thereof will be omitted.

Referring to FIGS. 1 to 3, the piston 400 according to an embodiment of the present invention is disposed inside the cylinder 100 facing the moving part 200.

Specifically, the piston portion 400 is disposed in the compression chamber 110, and is fixed at one side (left side in FIG. 1) of the cylinder portion 100.

The compression chamber 110 formed in the cylinder 100 may include the cylinder portion 100 and specifically the inner wall portion 101 of the opposing cylinder portion 100, the moving portion 200, the piston portion 400 As shown in FIG.

1 to 3, the support wall part 500 according to an embodiment of the present invention connects the inner wall part 101 of the cylinder part 100 and supports the cylinder part 100.

A piston part 400 fixed to the inside of the cylinder part 100 due to the support wall part 500 according to an embodiment of the present invention, a cylinder part 100, a movable arc contact point 20) can be moved.

1 and 2, the supporting wall part 500 according to the embodiment of the present invention is disposed between the piston part 400 and the moving part 200, and the supporting wall part 500 has a pressing part The through hole portion 510 is formed so that the through hole portion 600 is penetrated.

2, the pressing portion 600 is in contact with the moving portion 200 through the through hole portion 510 formed in the supporting wall portion 500, and the piston portion 400 and the piston portion 400 are coupled to each other. The compressing unit 600 compresses the expansion chamber 150 by pressing the moving unit 200 continuously.

The volume of the expansion chamber 150 is reduced and the pressure of the fluid G in the expansion chamber 150 is increased so that the high pressure fluid G passes through the nozzle unit 30 and flows into the fixed arc contact 10 Flows into the movable arc contact 20 so that the arc generated between the stationary arc contact 10 and the movable arc contact 20 is extinguished.

The high pressure fluid G is introduced into the expansion chamber 150 through the fluid regulator 300 in the compression chamber 110 and the expansion chamber 150 is continuously compressed and expanded through the nozzle unit 30 150) and the cooling performance is improved.

In the present invention, the pressing portion 600 is formed as a fixed member extending from the piston portion 400 toward the moving portion 200 side and fixed in shape, but is not limited thereto and may be formed of an elastic member such as a spring, 400 are elastically deformed and the length thereof is adjusted as the moving part 200 is pressed.

In the present invention, the pressurizing unit 600 is separated from the moving unit 200, but is not limited thereto. The pressurizing unit 600 and the moving unit 200 are connected to each other and interlocked with the movement of the pressing unit 600 It is possible to carry out various modifications such as being moved together.

The operation principle and effect of the gas barrier device 1 constructed as described above will be described.

1 to 3, when a fault occurs in the power system, the fixed arc contact 10 and the movable arc contact 20 (not shown) are removed by an actuator (not shown) connected to the cylinder 100, , The cylinder portion 100 is moved to the piston portion 400 side (left side in FIG. 1 reference right).

As the cylinder part 100 moves, the fluid G inside the compression chamber 110 is compressed by the piston part 400.

In addition, the fixed arc contact 10 and the movable arc contact 20 are separated, and at the same time an arc is generated between the fixed arc contact 10 and the movable arc contact 20.

In this case, when the pressure of the fluid G in the compression chamber 110 becomes higher than the pressure of the fluid G in the expansion chamber 150, the fluid regulator 300 coupled to the moving part 200 is opened The fluid G is injected between the stationary arc contact 10 and the movable arc contact 20 through the expansion chamber 150 and the nozzle unit 30 through the fluid regulating unit 300.

As a result, the arc generated between the fixed arc contact 10 and the movable arc contact 20 is extinguished by the fluid G compressed in the compression chamber 110, thereby blocking the fault current.

2, the pressure of the fluid G in the compression chamber 110 increases as the cylinder 100 moves toward the piston 400 (left side in FIG. 2) The fluid regulating unit 300 is opened.

Since the fluid regulating unit 300 controls the fluid G to flow only from the compression chamber 110 to the expansion chamber 150 side (left to right in FIG. 1), the high-pressure fluid G passes through the expansion chamber 150 and the nozzle unit 30 so that the arc generated between the fixed arc contact 10 and the movable arc contact 20 can be extinguished.

The fluid G flowing into the expansion chamber 150 from the compression chamber 110 through the fluid regulator 300 is discharged by the arc generated between the fixed arc contact 10 and the movable arc contact 20 (G) that is heated and mixed with the high temperature fluid (G) flowing into the expansion chamber (150) through the nozzle part (30) There is an effect of cooling the fluid (G).

Referring to FIG. 3, as the cylinder part 100 according to the embodiment of the present invention is moved, the piston part 400 is brought into contact with the supporting wall part 500 and the pressing part 600 Passes through the through hole 510 formed in the support wall part 500 and presses the moving part 200 so that the volume of the expansion chamber 150 is reduced.

The volume of the expansion chamber 150 is reduced and the pressure of the fluid G in the expansion chamber 150 is raised.

The pressure of the fluid G in the expansion chamber 150 is raised and the fluid G in the high pressure is discharged from the high temperature fluid G flowing into the expansion chamber 150, , It is mixed with the heat gas and the cooling performance is improved.

The pressure of the fluid G such as the insulating gas can be further increased as compared with the case where the position of the moving part 200 is fixed and the high pressure fluid G can be supplied to the fixed arc contact 10 through the nozzle part 30. [ And the movable arc contact 20 so that the arc generated between the stationary arc contact 10 and the movable arc contact 20 is extinguished and the arc performance is improved.

1 to 3, the supporting wall portion 500 includes a piston portion 400 which is fixed by the connection of the facing inner wall portion 101 of the cylinder portion 100, a piston portion 400 fixed to the fixed arc contact 10 There is an effect of supporting the cylinder part 100 being moved.

Hereinafter, the configuration, operation principle, and effects of the gas barrier device 1 according to another embodiment of the present invention will be described.

4 is a side cross-sectional view illustrating a gas barrier device according to another embodiment of the present invention. 5 is a side cross-sectional view showing a state in which the fluid regulating portion is opened in the gas barrier device according to another embodiment of the present invention. 6 is a side cross-sectional view showing a state in which the piston portion presses the moving portion in the gas barrier device according to another embodiment of the present invention.

4 to 6, the gas barrier device according to the present invention has a symmetrical structure with the X axis as a rotation center axis, and the configuration of one side (reference lower side in FIG. 1) with respect to the X axis is the other side Reference upper side), so that the drawings are omitted in the overlapping range.

4 to 6, a gas barrier device 1 according to another embodiment of the present invention includes a cylinder part 100, a moving part 200, a fluid control part 300, a piston part 400, And a supporting wall portion 500.

4, the supporting wall portion 500 according to another embodiment of the present invention is configured such that when the piston portion 400 is moved forward (toward the reference right side in FIG. 4) of the moving portion 200 of the piston portion 400, (Left side in Fig. 4). That is, the piston part 400 is disposed between the supporting wall part 500 and the moving part 200.

The piston unit 400 is directly contacted with the moving unit 200 when the cylinder unit 100 moves relative to the piston unit 400 fixed to the inside of the cylinder unit 100 in the event of a failure in the power system The moving part 200 is pressed.

5, as the cylinder 100 moves, the gap between the piston 400 and the moving part 200 decreases, the pressure of the fluid G in the compression chamber 110 increases, The fluid control unit 300 is opened and closed and the high-pressure fluid G flows into the expansion chamber 150 from the compression chamber 110.

6, the piston 400 and the moving part 200 are in contact with each other, and the moving part 200 is formed by the moving part 200 because the moving part 200 is movably installed inside the cylinder part 100 The volume of the expansion chamber 150 is reduced and the pressure of the fluid G in the expansion chamber 150 is increased.

The fluid G in the expansion chamber 150 is further raised so that the high pressure fluid G flows through the expansion chamber 150 and the nozzle unit 30 to the fixed arc contact 10 and the movable arc contact 20, So that the arc generated between the fixed arc contact 10 and the movable arc contact 20 is extinguished.

Since the moving part 200 is movably installed inside the cylinder part 100, the pressure rising effect and the high temperature generated between the fixed arc contact 10 and the movable arc contact 20 and flowing into the expansion chamber 150 (G), that is, the heat gas, and the cooling performance is improved.

Referring to FIGS. 4 to 6, when the arc extinguishing is completed, the cylinder part 100 is moved and returned to the correct position, and the moving part 200 is also returned to the fixed position in FIG.

A stopper portion 105 is formed on the inner wall portion 101 of the cylinder portion 100, specifically the inner side wall portion 101 (lower reference in FIG. 4) of the cylinder portion 100, do.

The stopper portion 105 is formed on the inner side wall portion 101 of the cylinder portion 100 but is not limited thereto and may be formed on the outer side inner wall portion 101 of the cylinder portion 100 And the like.

The distance between the moving part 200 and the piston part 400 within the cylinder part 100 can be ensured to be equal to or greater than the set interval by the stopper part 105. [ Therefore, even if the moving part 200 moves to the piston part 400, the moving part 200 is blocked by the stopper part 105 when the stopper part 105 is formed. The gap between the moving part 200 and the piston part 400 is not narrowed within the set distance by the stopper part 105. [

In another embodiment of the present invention, the stopper portion 105 is formed in a stepped shape on the inner wall portion 101 of the cylinder portion 100. However, the present invention is not limited to this, but may be implemented in various ways, such as a switch type in which it is protruded or inserted from the inner wall portion 101 of the cylinder portion 100 according to a predetermined point of time.

The gas barrier device 1 according to another embodiment of the present invention is characterized in that the support wall portion 500 is disposed on the rear side (left side in FIG. 4) of the piston portion 400 and the inner wall portion 101 of the cylinder portion 100, Except that the stopper portion 105 is protruded from the support wall portion 500 and the through hole portion 510 formed in the pressing portion 600 and the support wall portion 500 is not required. The operation principle and effects of the first embodiment are the same, so that the description thereof will be omitted in the overlapping range.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand. Accordingly, the technical scope of the present invention should be defined by the following claims.

Claims

A cylinder portion in which a compression chamber and an expansion chamber are formed;

A moving part movably installed inside the cylinder part and partitioning the compression chamber and the expansion chamber;

A fluid regulating unit that is openably and closably provided in the moving unit and regulates the flow of the fluid from the compression chamber to the expansion chamber; And

And a piston portion disposed inside the cylinder portion and facing the moving portion.
The method according to claim 1,

Wherein the fluid regulating portion controls the fluid to flow only from the compression chamber to the expansion chamber side.
The method according to claim 1,

And a support wall portion connecting the inner wall portion of the cylinder portion and supporting the cylinder portion.
The method of claim 3,

Wherein the support wall portion is disposed between the piston portion and the moving portion.
5. The method of claim 4,

Further comprising: a pressing portion coupled to the piston portion and configured to press the movable portion through the support wall portion.
The method of claim 3,

Wherein the piston portion is disposed between the supporting wall portion and the moving portion.
The method according to claim 6,

Wherein a stopper portion is formed on an inner wall portion of the cylinder portion so as to protrude on a moving path of the moving portion so as to restrict movement of the moving portion toward the piston portion.