KR101595110B1 - Gas circuit breaker for gas insulated switchgear - Google Patents

Abstract

The present invention relates to a gas circuit breaker of a gas insulated switchgear. In the present invention, the movable body 18 is provided inside the fixed body 10, and the movable electrode 18 and the movable electrode 28 are provided with the movable electrode 28 and the movable electrode 30, respectively. A movable body 20 is formed in the skeleton of the movable part 18. A movable body space 22 is formed in the movable body 20 and a gas control valve 26 is provided in the movable body space 22. [ Respectively. A main fixed electrode 42 coupled to and separated from the main movable electrode 28 and a fixed arc electrode 44 coupled to and separated from the movable arc electrode 30 are installed in the fixed electrode 40, . The movable body 20 is provided with a main nozzle 32 and an auxiliary nozzle 34 for spraying a gas to extinguish an arc generated when the movable arc electrode 30 and the fixed arc electrode 44 are separated from each other . The main nozzle 32 and the auxiliary nozzle 34 transfer the gas to the arc in the heat wave filter chamber 38 formed by the fixed body 10 and the moving body 20. A movable piston 36 is installed between the inner surface of the fixed body 10 and the outer surface of the movable body 20 so that the volume of the thermal parcels 38 can be varied. According to the present invention, the configuration of the movable portion 18 can be simplified, the gas circuit breaker can be made thinner and thinner as a whole, and the pressure of the heat parcels 38 can be kept constant at the beginning of the soot operation by the operation of the movable piston 36 And the operation of the gas circuit breaker can be effectively performed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a gas insulated switchgear

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas circuit breaker of a gas insulated switchgear, and more particularly, to a gas circuit breaker of a gas insulated switchgear which performs a soot effect on an arc by placing a heat paraffin and a movable piston.

Gas Insulated Switchgear (GIS) is a power transformer facility that improves the reliability by inserting conductors and various protective devices by using insulated gas, which is excellent in insulation performance and SOHO function, in an airtight container made of metal, , A disconnector, a ground switch, and the like.

In the event of a fault in the power system, the fault current must be cut off quickly and safely to protect the system and various power devices. The device that breaks the fault current is called a breaker, which is classified as a vacuum breaker, an oil breaker, or a gas breaker depending on the SOHO and insulation medium. The breaker interrupts the fault current, which means that the arc arising between the two contacts is canceled when the fault current is interrupted. Depending on the way the arc is extinguished, the gas circuit breaker can be switched between the puffer type and the rotary arc The thermal expansion method, the composite method, and so on. As an ultra high-voltage circuit breaker of 72.5kV class or higher, a gas circuit breaker of the Pafferhofer method using insulated gas (SF ₆ ) as a soffit and insulating medium is mainly used.

The breaker performs the breaking of the fault current. When a high voltage flows through the converter, an arc is generated when the electrode is disconnected. In the breaker, a separate fixed arc electrode and a movable arc electrode are provided so that an arc is generated only in the fixed arc electrode and the movable arc electrode. That is, the arc can be concentrated in one place so that it can be easily called out.

On the other hand, the cut-off operation in the gas circuit breaker requires a quick operation in units of a stroke in advance. For this, it is necessary to minimize the weight of the movable portion. The greater the weight of the moving part, the more energy is required to operate the moving part and the more difficult it is to operate quickly.

In gas circuit breakers, it is important to use the gas in the pump chamber without pressure loss in order to use the gas to extinguish the arc. However, conventionally, there is a problem that the gas from the pump chamber escapes into the moving body other than the main nozzle at the beginning of operation of the gas circuit breaker, and a certain amount of gas pressure loss is generated, adversely affecting the soho performance in a region where the arc is extinguished .

In the gas circuit breaker, there is a case where a small current is cut off and a large current is cut off. The amount of gas required differs according to the magnitude of the current to be cut. In the gas breaker of the related art, So that there is a problem that the optimum SO performance is not exhibited.

Korean Patent Publication No. 10-2011-0075509 Korean Patent No. 10-0584870

SUMMARY OF THE INVENTION An object of the present invention is to reduce the weight and size of a moving part of a gas circuit breaker.

Another object of the present invention is to distribute the gas used in the gas circuit breaker as efficiently as possible so as to extinguish the arc.

It is still another object of the present invention to make the arc soak well in various situations by causing the arc so that the arc can be operated even if the magnitude of the arc current is changed in the gas circuit breaker.

According to an aspect of the present invention, there is provided a gas circuit breaker of a gas insulated switchgear, which is installed in a tank having an insulating gas and performs opening and closing of a converter, And a movable body disposed in the fixed body space of the fixed body and being operated by an operating rod operated by a driving source, the main movable electrode and the movable arc electrode, A fixed electrode provided in the tank and having a main fixed electrode coupled to and separated from the main movable electrode, and a fixed arc electrode coupled to and separated from the movable arc electrode; and a fixed electrode formed between the fixed body and the movable body And a heat source for supplying a gas extinguishing an arc generated between the movable arc electrode and the fixed arc electrode to the main nozzle And a movable piston movably positioned between the fixed body and the movable body and configured to set the volume of the heat wave parasol according to the pressure of the heat wave parasol or the movement of the movable part, A stopping step is formed on the inner surface to regulate the movement stroke of the movable piston and an outer joint surface for moving the movable piston so that the movable arc electrode and the fixed arc electrode are coupled to each other is formed on the outer surface of the movable body .

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And an interlocking end is provided at a portion of the movable body where the main movable electrode is formed to move the movable piston together with the movable portion.

The moving body is provided with an auxiliary nozzle for spraying gas in a direction opposite to the spraying direction of the main nozzle to send gas to the moving body space formed inside the moving body.

The movable arc electrode and the fixed arc electrode are coupled before the main fixed electrode and the main movable electrode are coupled and separated before the main fixed electrode and the main movable electrode are separated.

A gas control valve is provided in the moving body space formed inside the moving body, and when the pressure of the gas released from the heat paraffin becomes a certain value or more, the gas is released.

The following effects can be obtained in the gas circuit breaker of the gas insulated switchgear according to the present invention.

In the present invention, the heat wave parasol is formed by the movable body and the main movable electrode on the moving part which is moved for blocking the converter. Therefore, it is not necessary to form the compression parlor in the movable portion, so that the structure is simplified, and the weight of the movable portion is relatively reduced. As a result, the weight and the size of the moving part are reduced, and the moving part is more easily moved. Therefore, it is possible to obtain an effect that the design of the operating device for moving the moving part is facilitated.

In the present invention, since the movable body space formed inside the fixed body is not directly connected to the outside, that is, the fixed body space side, but is communicated only by a gas control valve at a predetermined pressure or more, It is possible to obtain an effect that the small-current interruption effect in the small current interruption can be more surely performed.

Next, in the present invention, the movable piston is moved in accordance with the pressure inside the heat wave parasol. Accordingly, the pressure inside the heat paraffin can be kept constant, and at the same time, the volume of the heat paraffin can be increased when necessary, so that the arc caused by the small current and the arc caused by the large current can be appropriately eliminated. It is possible to appropriately perform the soaking action.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic sectional view showing a configuration of a preferred embodiment of a gas circuit breaker of a gas insulated switchgear according to the present invention; FIG.
2 is a cross-sectional view showing an enlarged configuration of an important part of an embodiment of the present invention.
3 is a cross-sectional view showing the configuration around the gas control valve constituting the embodiment of the present invention.
Fig. 4 is an operational state diagram sequentially showing that the gas circuit breaker according to the embodiment of the present invention is opened when no load is applied. Fig.
Fig. 5 is an operation state diagram sequentially showing that the gas circuit breaker of the embodiment of the present invention is closed when no load is applied. Fig.
6 is an operation state diagram sequentially showing that the gas circuit breaker according to the embodiment of the present invention is open when operated.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a gas circuit breaker of a gas insulated switchgear according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in the drawings, the gas circuit breaker of the present embodiment is fixedly installed inside a tank (not shown) in which the fixed body 10 constitutes the external appearance of the gas circuit breaker. The fixed body 10 is cylindrical in this embodiment. A fixed body space (12) is formed in the fixed body (10). A stopping end 14 protrudes from one side of the fixed body 12 corresponding to the inner surface of the fixed body space 12. In this embodiment, the inner diameter of the fixed body space 12 is different with respect to the stop end 14. The stop 14 is a portion to which the movable piston 36 is to be hooked, which will be described below, and serves to regulate the movement stroke of the movable piston 36. The stop 14 is formed around the inner surface of the fixed body space 12 in this embodiment.

And an operating rod 16 extending from the outside of the fixed body 10 to the fixed body space 12. The operating rod 16 is a portion that transmits power for driving the movable portion 18, which will be described below. The operating rod 16 extends to the outside of the tank and receives driving force from the driving source.

A movable part 18 is installed inside the fixed body 10. The movable portion 18 is moved by the operating rod 16 and is movable between the main movable electrode 28 and the main fixed electrode 42 and between the movable arc electrode 30 and the fixed arc electrode 44, And to connect and disconnect them.

The movable body 20 forms a skeleton of the movable portion 18. [ The moving body 20 is cylindrical in this embodiment. Of course, although the movable body 20 is not necessarily cylindrical, it is advantageous in terms of manufacturing that it is cylindrical. That is, both the fixed body 10 and the movable body 20 may be cylindrical.

A ring-shaped gap is formed between the outer surface of the movable body 20 and the inner surface of the fixed body 10, thereby positioning the movable piston 36, which will be described below. The space between the outer surface of the movable body 20 and the inner surface of the stationary body 10 becomes the heat wave parcels 38 to be described below and serves as a space through which the movable piston 36 moves.

An interlocking jaw 24 protrudes from one side of the outer surface of the moving body 20. The interlocking jaw 24 serves to interlock the movable piston 20 and the movable piston 36, which will be described below. That is, the main movable electrode 28, the main fixed electrode 42, the movable arc electrode 30, and the fixed arc electrode 44 are coupled to each other to move the movable piston 36 in a closed state.

A gas control valve 26 is installed in the moving body space 22 inside the moving body 20. The gas control valve 26 serves to control the movement of the gas through the moving body space 22. That is, if the pressure of the gas is not equal to or more than a predetermined value, gas is not discharged from the moving body space 22 through the gas control valve 26. By doing so, it is possible to prevent the waste of the gas for extinguishing the arc.

A main movable electrode (28) is provided at the tip of the movable body (20). The main movable electrode 28 is a portion to which the main fixed electrode 42 to be described below is coupled and electrically connected. In this embodiment, the main movable electrode 28 is cylindrical. The portion where the main movable electrode 28 is formed also has a cylindrical shape. The outer surface of the main movable electrode 28 can be moved close to the inner surface of the fixed body 10. At the rear end of the portion where the main movable electrode 28 is formed, there is an interlocking end 29. The interlocked end 29 is a portion that pushes the movable piston 36, which will be described below. A detailed description of the portions where the main movable electrode 28 and the interlocking end 29 are formed will be omitted.

A movable arc electrode (30) is provided at a portion of the distal end of the movable body (20) corresponding to the inside of the main movable electrode (28). The movable arc electrode 30 also has a substantially cylindrical shape. The movable arc electrode 30 is a portion electrically connected to the fixed arc electrode 44 to be described below. The movable arc electrode 30 and the fixed arc electrode 44 are coupled before the main movable electrode 28 and the main fixed electrode 42 are coupled to each other. The main fixed electrode 42 is separated later than it is separated. This is so that an arc is generated only in the movable arc electrode 30 and the fixed arc electrode 44.

A main nozzle 32 is provided at a portion between the main movable electrode 28 and the movable arc electrode 30. The main nozzle 32 is elongated such that a fixed arc electrode 44 to be described below is accommodated therein. A fixed arc electrode (44) is located in the nozzle flow path (33) formed in the main nozzle (32) when closed. The nozzle flow path 33 of the main nozzle 32 is formed between the inner surface of the main nozzle 32 and the outer surface of the movable arc electrode 30.

Here, the nozzle flow path 33 is an upstream length of the nozzle flow path 33 up to a position corresponding to the tip of the movable arc electrode 30, and the subsequent section from the tip end of the fixed arc electrode 44 is downstream. The nozzle flow path 33 is formed to be bent at a tip portion of the movable arc electrode 30. [

A portion of the movable arc electrode 30 facing the movable body space 22 is an auxiliary nozzle 34. And gas is injected into the moving body space 22 through the auxiliary nozzle 34. The fixed arc electrode 44, which will be described below, is located in the auxiliary nozzle 34 when closed.

A movable piston (36) is installed between the inner surface of the fixed body (10) and the outer surface of the movable body (20). The movable piston 36 is ring-shaped in this embodiment and is moved along the fixed body 10 and the movable body 20. The movement of the movable piston 36 is performed when the pressure of the heat wave path chamber 38 to be described below becomes a predetermined value or more at the time of loading and can be made by the interlocking end 29 at no load or at the time of load. The movable piston (36) has a check valve (not shown). The check valve is closed when the pressure of the heat wave pulses 38 to be described below is higher than the external pressure and is opened when the pressure is opposite to the external pressure so that the cold gas can flow into the heat wave parasell 38 from the outside.

In the fixed body space 12 of the fixed body 10, a heat wave parasell 38 is formed. The heat paraffin 38 is a space defined by the outer surface of the movable body 20, the inner surface of the main movable electrode 28, the inner surface of the fixed body 10, and the movable piston 36 described below. The heat parcels 38 communicate with the outside through the nozzle flow path 33 of the main nozzle 32. The gas heated by the heat provided by the arc enters the heat parcels 38 and the original gas and the heated gas are mixed and discharged to the outside through the nozzle passage 33 again in the heat parcels 38. [

There is a main movable electrode 28 of the movable part 20 and a fixed electrode 40 which is coupled with the movable arc electrode 30 and performs energization. The fixed electrode 40 is fixed so as to face the distal end of the movable unit 20. A main fixed electrode (42) is formed around the edge of the high voltage electrode (40). The main fixed electrode 42 is connected to the main movable electrode 28. Therefore, the shapes of the main fixed electrode 42 and the main movable electrode 28 are configured to correspond to each other.

A fixed arc electrode 44 is disposed at the center of the fixed electrode 40. The fixed arc electrode 44 is coupled with the movable arc electrode 30. The fixed arc electrode 44 is bar-shaped and inserted into the movable arc electrode 30. The fixed arc electrode (44) protrudes more than the main fixed electrode (42). The movable electrode 28 and the main fixed electrode 42 are coupled with each other before the main movable electrode 28 and the main fixed electrode 42 are coupled with each other. (30).

Hereinafter, the operation of the gas circuit breaker of the gas insulated switchgear according to the present invention will be described in detail.

First, explain that open operation occurs at no load. Here, no load is not actually a gas circuit breaker, but it can be said to check the operation status of the circuit breaker before use.

The breaker is energized in a state where the main movable electrode 28, the main fixed electrode 42, the movable arc electrode 30, and the fixed arc electrode 44 are coupled.

In this state, when the operating rod 16 is driven by the driving source, the movable part 18 moves in the left direction with reference to the drawing. The volume of the heat wave parasol 38 is reduced while the movable portion 18 is moved to the left. This is because the movable piston 36 is not moving. When the movable portion 18 moves to a certain extent and the interlocked end 29 pushes the movable piston 36, the movable piston 36 moves together with the movable portion 18 so that the volume of the heat paraffin 38 becomes constant maintain. In this process, the gas from the heat parcels 38 is discharged through the main nozzle 32 and the auxiliary nozzle 34. When the pressure of the gas discharged through the auxiliary nozzle 34 becomes a certain value or more, The control valve 26 is opened and the gas is discharged to the outside in the moving body space 22. [ Such a state is shown in Fig. 4 (b).

The movement of the movable piston 36 by the movable portion 20 is continued until the movable piston 36 is caught by the stop end 14 of the fixed body 10. [ The movable part 18 continues to move in a state where the movable piston 36 is caught by the stop end 14 and therefore the volume of the heat wave pulses 38 continues to be small, So that the gas can be continuously discharged through the main nozzle 32 and the auxiliary nozzle 34. Such a state is shown in Fig. 4 (c).

Next, it will be explained that the no-load close operation is performed. Fig. 5 sequentially explains how the gas manipulator is closed during no-load operation. As described above, when the open operation is performed and the closing operation is performed again, the movable unit 18 moves in the reverse direction. The operation of the movable portion 18 is performed by the operation rod 16. Such a state is shown in Fig. 5 (a).

The movable piston 18 and the movable piston 18 move together when the interlocking protuberance 24 is caught by the movable piston 36 engaged with the stopping end 14. Such a state is shown in Fig. 5 (b). In this process, the check valve of the movable piston 36 is opened so that the cold gas flows into the heat parcels 38 and is filled therein.

When the movable part 18 is continuously moved, the movable arc electrode 30 and the fixed arc electrode 44 are coupled first. Next, the main movable electrode 28 and the main fixed electrode 42 are coupled to each other, The state shown in (c) of Fig.

On the other hand, the operation of opening the housing will be described with reference to FIG. When an operation signal is applied to the driving unit due to an overload, the driving unit drives the operating rod 16 to move the movable unit 18 in the left direction with respect to the drawing. The movement of the movable part 18 causes separation of the main movable electrode 28 and the main fixed electrode 42 first. However, if the main arc electrode 30 and the fixed arc electrode 44 are not separated, an arc is not generated. 6A shows a state in which the main arc electrode 30 and the fixed arc electrode 44 are separated from each other. Therefore, in this state, an arc is generated between the main arc electrode 30 and the fixed arc electrode 44.

When an arc is generated, heat is transferred to the surrounding air, and the air heated through the nozzle flow path 33 rapidly enters the heat parcels 38. By such an operation, the pressure of the heat wave pulses 38 becomes high. The air introduced into the heat parcification chamber 38 is mixed with the air in the existing thermal parlor 38 and is supplied to the main nozzle 32 and the auxiliary nozzle 34 through the nozzle flow path 33 in a state in which the temperature is relatively low, And is sprayed. The gas injected through the main nozzle 32 acts to extinguish the arc.

Here, the movable piston 36 moves according to the pressure of the heat parcup 38. For example, if the pressure of the heat parcels 38 can not move the movable piston 36, the movable piston 36 is not moved. If the pressure exceeds the predetermined pressure, the movable piston 36 moves to the left. Such movement of the movable piston 36 can be made to the position of the stop end 14. Of course, when the pressure of the heat parcels 38 is less than a predetermined pressure, the movable piston 36 is fixed and moved by the interlocked end 29 to move. The operation of the movable piston 36 allows the pressure of the heat parcels 38 to be maintained constant and ensures that the gas injection for the arc extinguishing action of the arc is constant under all circumstances.

6B shows a state in which the movable arc electrode 30 and the fixed arc electrode 44 are completely separated and the movable piston 36 is caught by the stop end 14. [ However, an arc is generated between the movable arc electrode 30 and the fixed arc electrode 44. In this state, when the movable part 18 is continuously moved, the volume of the thermal parcels 38 is reduced. Therefore, the gas is continuously discharged from the thermal parcels 38 through the nozzle flow path 33, . At this time, if the pressure of the gas discharged from the heat paraffin 38 is high, the gas regulating valve 26 is opened to control the pressure. The gas regulating valve 26 is not opened until this time, so that the gas from the heat parcels 38 can be used to extinguish the arc.

6 (c) shows that the movable portion 18 continues to move in a state where the movable piston 36 is hooked on the stop end 14. In this case, the volume of the thermal parcels 38 is reduced. Even if the pressure of the thermal parcels 38 is low, the injection of the gas through the nozzle channels 33 is kept constant. That is, the volume of the thermal parcels 38 is reduced so that the gas injection is not reduced. Of course, the volume of the thermal parcels 38 is reduced and the pressure is excessively increased by controlling the discharge of the gas through the gas control valve 26.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

For reference, the gas control valve 26 is not necessarily used, but may be employed only when it is necessary to prevent waste of gas at the beginning of the soot operation.

10: fixed body 12: fixed body space
14: Stop 16: Operation rod
18: moving part 20: moving body
22: moving body space 24: interlocking jaw
26: gas control valve 28: main movable electrode
30: movable arc electrode 32: main nozzle
33: nozzle flow path 34: auxiliary nozzle
36: movable piston 38:
40: fixed electrode 42: main fixed electrode
44: fixed arc electrode

Claims (6)

A gas circuit breaker of a gas insulated switchgear installed in a tank having an insulating gas to perform opening and closing of a converter,
A fixed body having a fixed body space formed therein,
A moving part having a main movable electrode and a movable arc electrode disposed in a movable body, which is located within the fixed body space of the fixed body and operated by an operating rod operated by a driving source,
A stationary electrode having a main fixed electrode coupled to and separated from the main movable electrode, and a fixed arc electrode coupled to and separated from the movable arc electrode,
A heat pump pedal formed between the fixed body and the movable body to supply a gas to the main nozzle to extinguish an arc generated between the movable arc electrode and the fixed arc electrode;
And a movable piston movably positioned between the fixed body and the movable body and configured to set the volume of the heat wave parasol according to a pressure of the heat wave parasol or a movement of the movable part,
And a fixed stopper is formed on the inner surface of the fixed body to regulate a movement stroke of the movable piston, and an outer surface of the movable body is provided with an interlocking mechanism for moving the movable piston so that the movable arc electrode and the fixed arc electrode are engaged with each other, A gas circuit breaker of a gas insulated switchgear having a tuck formed therein.
delete The gas-insulated switchgear according to claim 1, wherein an interlocking end is provided at a portion of the movable body where the main movable electrode is formed, the movable end being capable of moving the movable piston when the movable portion moves.
The gas insulated switchgear according to claim 1, wherein the moving body is provided with an auxiliary nozzle for injecting a gas in a direction opposite to the spraying direction of the main nozzle to send gas to a moving body space formed inside the moving body, .
2. The gas insulated switchgear according to claim 1, wherein the movable arc electrode and the fixed arc electrode are combined before the main fixed electrode and the main movable electrode are coupled and separated before the main fixed electrode and the main movable electrode are separated from each other, .
 [5] The apparatus as claimed in claim 1, wherein the movable body is provided with a gas control valve in the movable body, Of the gas insulated switchgear of the present invention.

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