KR20120008369U - Gas insulated switchgear - Google Patents

Abstract

The present invention is to provide an improved gas insulated switchgear capable of maximally cooling the temperature of the heat gas flowing out to the enclosure side, the enclosure according to the present invention; A fixed main contact having a cooling tube portion in which a heat gas outlet is formed; A fixed arc contact fixedly installed to extend in the longitudinal direction of the fixed main contact; A cooling cylinder in which a heat gas outlet is formed; A movable rod capable of moving forward or backward in a linear direction by a linear driving force from the drive source; A movable arc contact movable into a first position contacting the fixed arc contact and a second position separate from the fixed arc contact; A movable main contact movable to a position in contact with the fixed main contact and to a position separate from the fixed main contact; A first cooling ring having a plurality of protrusions and recesses to cool the heat gas before being discharged through the cooling gas heat outlet; And a second insulated ring is disclosed.

Description

Gas Insulated Switchgear {GAS INSULATED SWITCHGEAR}

The present invention relates to a gas insulated switchgear and in particular to a gas insulated switchgear which can improve the heat gas cooling performance.

Gas insulated switchgear is installed on ultra high voltage power lines (circuits) of tens of kilovolts or more and hundreds of kilovolts or more to intentionally open or close the line in normal use or to ground faults or electric It is a power device that protects an electric power system and electric equipment by automatically cutting off a line automatically when a large accident current occurs due to a shortage. Gas insulated switchgear has a fixed contact and a movable contact for opening and closing the circuit in a grounded metal container filled with insulating gas for the opening and closing of an ultra high voltage circuit.

In the gas insulated switchgear, a configuration and an operation of an example of the related art will be described with reference to FIGS. 1 to 2.

1 is a cross-sectional view showing a closed (closed) state as a cross-sectional view of a gas insulated switchgear according to the prior art (not shown), with half of the lower symmetry around a center line of a dashed line, and FIG. 2 is a cross-sectional view of the gas insulated switchgear of FIG. This is a cross-sectional view showing the blocking (opening) state.

The overall cross-sectional view of the gas insulated switchgear according to the prior art may refer to Korean Patent Registration No. 10-0631006 (name of the invention: gas insulated switchgear) which is registered by the applicant of the present invention.

The gas insulated switchgear according to the example of the prior art is composed of a stationary side unit (STATIONARY UNIT), a movable side unit (MOVABLE UNIT) and the enclosure (1).

Enclosure 1 is a housing for accommodating the components of the gas insulated switchgear is filled with an insulating gas having an electrical insulation, such as sulfur hexafluoride (SF6). The enclosure 1 is also grounded.

The stationary side unit is composed of a stationary main contactor (9), a cooling cylinder section (12), a stationary arc contactor (7), and is housed in an enclosure (1).

The movable side unit includes a cooling cylinder 10, a movable main contactor 8, a movable nozzle 6 and a movable arc contactor 5, a movable rod 4, an operation link 3 and an actuator. 2). The cooling cylinder 10, the movable main contactor 8, the movable nozzle 6 and the movable arc contactor 5, and the movable rod 4 are housed in the enclosure 1, and the operation link 3 is enclosed in the enclosure 1. Extending in and out of, the manipulator 2 is located outside of the enclosure 1.

The fixed main contact 9 is a main contact portion electrically connected to either side of the power supply side or the load side of the power circuit.

The cooling tube part 12 is electrically and mechanically connected to the fixed main contactor 9 and accommodates the fixed arc contactor 7 therein. The cooling cylinder part 12 absorbs heat from the arc generated when the circuit is opened and closed, and the arc cools and becomes an insulated gas. It performs the function of discharging (hereinafter referred to as heat gas). The cooling cylinder part 12 is electrically connected to either side of the power supply side or the load side of an external power circuit. The rear side of the cooling cylinder part 12 is provided with a heat gas outlet 11 for discharging the heat gas into the insulating gas filled between the enclosure (1).

The fixed arc contact 7 is provided in the cooling cylinder portion 12 corresponding to the movable arc contact 5 of the movable side unit, and the fixed main contact 9 is electrically and mechanically separated from the movable main contact 8. This minimizes arcing by separating electrical and mechanical with a predetermined time delay.

The cooling cylinder 10 has an inner circumferential surface in electrical contact with the outer surface of the movable main contactor 8 and is provided with a fixed piston (not shown) fixed therein so as to provide insulation gas between the movable main contactor 8. Form a compression chamber. The cooling cylinder 10 is electrically connected to the opposite side to the side to which the said cooling cylinder part 12 is electrically connected as either the power supply side or the load side of an external power circuit. The rear of the cooling cylinder 10 is provided with a heat gas outlet 11 for discharging the heat gas into the insulating gas filled between the enclosure (1).

The movable main contact 8 is mechanically connected to the movable arc contact 5 by a connector such as a link LINK (not shown) and linearly moves in the same direction with the movable arc contact 5.

The nozzle 6 is integrally movable at the distal end of the movable main contactor 8 by welding or the like so that the movable main contactor 8 retracts and the compression chamber is compressed (that is, when the power circuit is opened). ) Spray toward the fixed arc contact 7 facing the compressed insulation gas.

The movable arc contacts 5 are movably connected together with the movable main contact 8 as described above and mechanically connected to the operation link 3 to receive the driving force.

 The movable rod 4 is a power transmission means which is driven to be connected to the manipulator 2 which is an external drive source and connected to transfer the power to the movable arc contactor 5. The movable rod 4 is provided with an outlet 14 for absorbing heat of the arc flowing back through the nozzle 6 and discharging the heat gas, which has become a high temperature, into the cooling cylinder 10.

The manipulator 2 is a drive source provided on the outside of the enclosure 1 to provide a linear driving force, for example, a drive source such as an electric motor, a spring that accumulates elastic force, a permanent magnet actuator, and a gear and a crank for transmitting the driving force therefrom. ), Links, and the like.

Referring to FIGS. 1 and 2, a power circuit opening and closing operation of a gas insulated switchgear according to an example of the related art configured as described above will be described below.

First, the operation from the power circuit open state of FIG. 2 to the power circuit input state of FIG. 1 will be described.

When power from the manipulator 2 is transmitted to the movable rod 4 and the movable rod 4 linearly moves to the left as shown in FIG. 1, the movable arc contactor 5 and the movable arc driven to the movable rod 4 are driven. The movable main contact 8 and the nozzle 6 which are movably connected to the contact 5 are linearly moved to the left toward the fixed arc contact 7 in the cooling cylinder portion 12. Thus, the movable arc contactor 5 is in contact with the fixed arc contactor 7 and the movable main contactor 8 is in contact with the stationary main contactor 9 to be in a closed state in which a power circuit between the power supply side and the load side is connected. At this time, since the compression chamber is expanded, there is no injection toward the fixed arc contactor 7 of the insulating gas.

Next, the operation from the power circuit closing state of FIG. 1 to the power circuit opening state of FIG. 2 will be described.

When power from the manipulator 2 is transmitted to the movable rod 4 and the movable rod 4 linearly moves to the right as shown in FIG. 1, the movable arc contactor 5 and the movable arc driven to the movable rod 4 are driven. The movable main contact 8 and the nozzle 6 which are movably connected to the contact 5 are linearly moved from the fixed arc contact 7 in the cooling cylinder 12 to the oil side. Therefore, the movable main contactor 8 is first separated from the fixed main contactor 9, and subsequently the movable arc contactor 5 is also separated from the fixed arc contactor 7 so that the power circuit between the power supply side and the load side is opened. It is blocked. At this time, since the compression chamber between the fixed pistons fixed by the retracting movable main contactor 8 is compressed, the insulating gas is injected toward the fixed arc contactor 7 to extinguish the arc.

In addition, the arc is heat-absorbed and cooled by the insulating gas, and the hot gas, which has become a high temperature, is discharged into the enclosure 1 through the heat gas outlet 11 of the cooling cylinder part 12, and the arc flowing backward through the nozzle 6 The insulating gas in the compression chamber absorbs heat to become heat gas and is discharged into the cooling chamber 10 through the outlet 14, and then discharged into the enclosure 1 through the heat gas outlet 11 of the cooling cylinder 10. do.

In the gas insulated switchgear according to an example of the prior art, which is constructed and operated as described above, the hot gas of high temperature and high pressure discharged into the enclosure 1 and remaining in the enclosure 1 is re-injected (closed). When driving to the) position there was a problem that can break the insulation between the phases of the three-phase AC circuit, or cause a ground fault.

Accordingly, the present invention solves the problems of the prior art described above, and an object of the present invention is to provide an improved gas insulated switchgear capable of maximally cooling the temperature of the heat gas flowing out to the enclosure side.

The object of the present invention, in the gas insulated switchgear,

Enclosure;

A fixed main contactor fixedly installed in the enclosure and having a cooling cylinder portion having a heat gas outlet;

A fixed arc contactor fixedly installed at an inner center of the fixed main contactor to extend in the longitudinal direction of the fixed main contactor;

A cooling tube formed to extend from the fixed main contactor and fixedly installed in the enclosure and having a heat gas outlet;

An insulating gas filled in the enclosure;

A movable rod capable of moving forward or backward in a linear direction by a linear driving force from the drive source (MOVABLE ROD);

A movable arc contact connected to the movable rod and movable forward or backward by the movable rod moving forward or backward and movable to a first position contacting the fixed arc contact and a second position separate from the fixed arc contact ;

A movable main contact connected to the movable rod and movable forward or backward by the movable rod moving forward or backward and movable to a position contacting the fixed main contact and a position separate from the fixed main contact;

A first cooling ring fixed to the cooling barrel and having a plurality of protrusions and recesses to cool the heat gas before being discharged through the cooling gas heat outlet; And

And a second cooling ring fixed to the cooling cylinder of the fixed main contactor and having a plurality of protrusions and recesses to cool the hot gas before being discharged through the hot gas outlet on the cooling cylinder. It can be achieved by providing a gas insulated switchgear according to the design.

The gas insulated switch according to the present invention can be installed in the movable part and the fixed part by installing a cooling plate having a plurality of protrusions and recesses to cool the hot gas before the hot gas is discharged to the enclosure side. Operation) can prevent breakdown and occurrence of ground fault.

In the gas insulated switchgear according to the present invention, the recess is spirally formed to form a plurality of gas turbulences, whereby a mixture of hot gas and cold gas is generated around the cooling plate by the plurality of gas turbulences. And it is possible to obtain the effect that the temperature of the heat gas can be cooled by the heat transfer.

1 is a cross-sectional view showing a closed (closed) state as a cross-sectional view of a gas insulated switchgear according to the related art, in which half of the lower symmetry is centered on a center line of a single-dot chain line;
2 is a cross-sectional view illustrating a blocking (opening) state for the gas insulated switchgear of FIG. 1,
3 is a cross-sectional view of a gas insulated switchgear according to a preferred embodiment of the present invention, in which half of the lower symmetry around the center line of the one-dot chain line is omitted.
4 is a partially enlarged view of the gas insulated switchgear according to FIG. 3.

The object of the present invention and the constitution and effect of the present invention to achieve the same will be more clearly understood by the following description of the preferred embodiment of the present invention with reference to the accompanying drawings.

FIG. 3 is a cross-sectional view of a gas insulated switchgear according to a preferred embodiment of the present invention, in which half of the lower symmetry is not shown, and FIG. 4 is a partially enlarged view of the gas insulated switchgear according to FIG. 3.

Referring to Figures 3 to 4 will be described the configuration of the gas insulated switchgear according to a preferred embodiment of the present invention.

As shown, the gas insulated switch is an enclosure (1), a fixed main contactor (9), a fixed arc contactor (7), a cooling vessel (10), a movable rod (4), a movable arc contactor (5), a movable main contactor. (8), the 1st cooling ring 20b and the 2nd cooling ring 20a are included.

Enclosure 1 is filled with an insulating gas therein, and accommodates the above components constituting the gas insulated switchgear according to the present invention. Enclosure (1) is composed of a cylindrical tube made of a metal material such as iron plate and is grounded to prevent electrical safety accidents such as electric shock.

The components constituting the gas insulated switchgear according to the present invention installed in the enclosure (1) can be largely divided into a fixed side unit and a movable side unit, where the fixed main unit (9) And a fixed arc contactor 7 and a second cooling ring 20a, wherein the movable side unit includes a cooling vessel 10, a movable rod 4, a movable arc contactor 5, and a movable main contactor. (8) and the 1st cooling ring 20b are included.

First, the configuration of the components included in the fixed side unit will be described.

The fixed main contactor 9 is fixedly installed in the enclosure 1 and has a cooling cylinder portion 12 in which a heat gas outlet 11 is formed. The fixed main contactor 9 and the cooling cylinder portion 12 are composed of an electrical conductor and may be formed integrally with each other or connected integrally. The fixed main contact 9 can be electrically connected to the power supply side or the load side of the external power circuit.

The fixed arc contact 7 is a contact composed of an electrical conductor fixedly installed in the inner center of the fixed main contact 9 extending in the longitudinal direction of the fixed main contact 9. The fixed arc contact 7 minimizes arcing by separating the fixed main contact 9 electrically and mechanically with a predetermined time delay rather than electrically and mechanically disconnecting from the movable main contact 8.

Next, the configuration of the components included in the movable side unit will be described.

The cooling cylinder 10 is a component corresponding to the fixed main contact 9 of the fixed side unit in the movable side unit, and is fixedly installed in the enclosure 1 at a predetermined distance from the fixed main contact 9. The heat gas discharge port 11 is formed to be open toward the outer enclosure 1 side. The cooling tube 10 is composed of an electrical conductor and can be electrically connected to the opposite side to the side to which the fixed main contactor 9 is connected, either on the power side or the load side of the external power circuit. In addition, the cooling cylinder 10 has an inner circumferential surface in electrical contact with the outer surface of the movable main contactor 8 and is electrically connected to each other, and has a fixed piston (not shown) fixed therein to insulate the movable main contactor 8 from each other. The compression chamber 13 of gas is formed.

The movable rod 4 is a rod-type power transmission means connected to a drive source and movable forward or backward in a linear direction by a linear drive force provided by the drive source. The movable rod 4 carries a linear drive force by the movable arc contactor 5 and the movable main contactor 8. To directly or indirectly through a connecting member. The drive source is a drive source which is installed outside the enclosure 1 and provides a linear driving force to the movable rod 4, for example, a drive source such as an electric motor, a spring for compressing elastic force, a permanent magnet actuator, and the like and a driving force therefrom. Gears, cranks, links, etc. may be included. The movable rod 4 is provided with an outlet 14 for absorbing heat of the arc flowing back through the nozzle 6 and discharging the heat gas, which has become a high temperature, into the cooling cylinder 10.

The movable arc contactor 5 is connected to the movable rod 4 and is movable forward or backward by the movable rod 4 moving forward or backward, and the fixed arc contactor with the first position contacting the fixed arc contactor 7. It consists of an electrical conductor moveable to a second position separate from (7).

The movable main contactor 8 is connected to the movable rod 4 and can be moved forward or backward by the movable rod 4 moving forward or backward, and the position where the outer circumferential surface contacts the fixed main contactor 9 and the fixed main contactor It is movable to the position separated from (9). The movable main contact 8 is composed of a substantially cylindrical electrical conductor and is always in electrical contact with the cooling cylinder 10 in contact with the cooling cylinder 10. A nozzle 6 may be attached to the leading end of the movable main contactor 8 by welding or the like to guide the injection of the insulating gas.

The first cooling ring 20b is formed of a ring-shaped metal material and is fixed to the cooling cylinder 10 by a connection method such as welding or screwing. The first cooling ring 20b has a plurality of protrusions (see reference numeral 20a1 in FIG. 4) and grooves (see reference numeral 20a2 in FIG. 4) on its surface to be discharged through the heat gas outlet 11 on the cooling tube 10. The previous heat gas G is cooled. In FIG. 4, the configuration of the second cooling ring 20a installed in the cooling cylinder part 12 of the stationary main contactor 9 is enlarged in detail, but the plurality of protrusions and the plurality of protrusions of the first cooling ring 20b are illustrated. Note that the recessed portion has the same configuration as the plurality of protrusions 20a1 and the recessed portion 20a2 of the second cooling ring 20a.

As shown in FIG. 4 of the ring shape, the 2nd cooling ring 20a is fixedly installed in the cooling cylinder part 12 of the stationary main contactor 9, and the several protrusion 20a1 and the yaw are formed on the surface. The groove 20a2 is cooled to cool the heat gas before being discharged through the heat gas outlet 11 on the cooling tube 10.

According to a preferred feature of the present invention, in the first cooling ring 20b and the second cooling ring 20a, the groove portion 20a2 may have a plurality (a large number) of gas turbulences as shown in FIG. 4. It is formed spirally to form a flow G2.

Next, the effect of the gas insulated switchgear according to the preferred embodiment of the present invention configured as described above will be described with reference to FIGS. 3 to 4.

First, the operation from the power circuit open state of FIG. 3 to the power circuit input (closed) state will be described.

When power from a driving source, not shown, is transmitted to the movable rod 4 and the movable rod 4 linearly moves to the left from the position shown in FIG. 3, the movable arc contactor 5 driven to the movable rod 4 is connected. And the movable main contact 8 and the nozzle 6 movably connected together to the movable arc contact 5 are linearly moved leftward to the fixed main contact 9 and the fixed arc contact 7. Thus, the movable arc contactor 5 is in contact with the fixed arc contactor 7 and the movable main contactor 8 is in contact with the stationary main contactor 9 to be in a closed state in which a power circuit between the power supply side and the load side is connected. At this time, since the compression chamber 13 is expanded, there is no injection toward the fixed arc contact 7 of the insulating gas.

Next, the operation from the above-described power circuit closing state to the power circuit opening state of FIG. 3 will be described.

When power from a driving source (not shown) is transmitted to the movable rod 4 and the movable rod 4 linearly moves to the right as shown in FIG. 3, the movable arc contactor 5 driven to the movable rod 4 is connected. And the movable main contactor 8 and the nozzle 6 movably connected together to the movable arc contactor 5 are straight to the right from the fixed main contactor 9 and the fixed arc contactor 7 in the cooling tube section 12. Move. Therefore, the movable main contactor 8 is first separated from the fixed main contactor 9, and subsequently the movable arc contactor 5 is also separated from the fixed arc contactor 7 so that the power circuit between the power supply side and the load side is opened. It is blocked. At this time, since the compression chamber 13 between the fixed pistons fixed by the retracting movable main contactor 8 is compressed, insulation gas is injected toward the fixed arc contactor 7 to arc the arc.

In addition, the arc is heat-absorbed by the insulating gas, cooled and heated to a high temperature (G) is discharged into the enclosure 1 through the heat gas outlet 11 of the first fixed container 12 as shown in FIG. The arc flowing back through the nozzle 6 absorbs heat into the insulating gas in the compression chamber to become heat gas, and is discharged into the cooling tube 10 through the outlet 14, and then the heat gas of the cooling tube 10. It is discharged into the enclosure 1 through the outlet 11.

Here, according to the present invention, before the heat gas G is discharged through the heat gas outlet 11, a plurality of protrusions 20a1 of the second cooling ring 20a and the first cooling ring 20b according to the present invention and The heat gas G is contacted and cooled along the long surface distance by the groove 20a2, and the heat gas cooled by the spiral groove 20a2 forms a gas turbulence G2 like a lot of whirlwinds. do. This gas turbulence (G2) promotes the mixing of the hot thermal gas (G1) and the existing insulating gas of a relatively low temperature, the temperature of the hot gas is cooled by heat transfer, discharged into the enclosure (1) through the heat gas outlet (11) do.

Therefore, according to the present invention, since the insulation gas in the enclosure 1 does not have a large temperature rise due to the heat gas, problems such as insulation breakdown and ground fault can be prevented due to high temperature and high pressure change of the insulation gas.

1: enclosure 2: manipulator
3: operation link 4: movable rod
5: movable arc contact 6: nozzle
7: fixed arc contact 8: operation main contact
9: fixed main contactor 10: cooling tank
11: heat gas outlet 12: cooling tube part
13: compression chamber 14: outlet

Claims (2)

In gas insulated switchgear,
An enclosure filled with insulating gas therein;
A fixed main contactor fixedly installed in the enclosure and having a cooling cylinder portion in which a heat gas outlet is formed;
A fixed arc contactor fixedly installed at an inner center of the fixed main contactor to extend in the longitudinal direction of the fixed main contactor;
A cooling tube fixedly installed in the enclosure at a predetermined distance from the fixed main contactor and having a heat gas outlet;
A movable rod capable of moving forward or backward in a linear direction by a linear driving force from the drive source (MOVABLE ROD);
A movable arc contact connected to the movable rod and movable forward or backward by the movable rod moving forward or backward and movable to a first position contacting the fixed arc contact and a second position separate from the fixed arc contact ;
A movable main contact connected to the movable rod and movable forward or backward by the movable rod moving forward or backward and movable to a position contacting the fixed main contact and a position separate from the fixed main contact;
A first cooling ring fixed to the cooling barrel and having a plurality of protrusions and recesses to cool the heat gas before being discharged through the cooling gas heat outlet; And
A second cooling ring fixed to the cooling cylinder of the fixed main contactor and having a plurality of protrusions and recesses to cool the hot gas before being discharged through the hot gas outlet on the cooling cylinder; switch. The method of claim 1,
And said recess is formed spirally to form a plurality of gas turbulences.

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