KR200478813Y1 - Gas insulated switchgear - Google Patents

Abstract

The present invention provides an improved gas insulated switchgear capable of cooling the temperature of the heat gas flowing out to the enclosure side as much as possible. A fixed main contact having a cooling cylinder in which a heat gas outlet is formed; A fixed arc contact fixedly installed to extend in the longitudinal direction of the fixed main contactor; A cooling cylinder in which a hot gas outlet is formed; A movable rod which can be moved forward or backward in a linear direction by a linear driving force from a driving source; A movable arc contact movable to a first position in contact with the fixed arc contact and to a second position separate from the fixed arc contact; A movable main contact movable to a position contacting the fixed main contact and a position separated from the fixed main contact; A first cooling ring having a plurality of protruding portions and recessed portions for cooling the heat gas before being discharged through the cooling normal heat gas outlet; And a second cooling ring. ≪ Desc / Clms Page number 3 >

Description

[0001] GAS INSULATED SWITCHGEAR [0002]

The present invention relates to a gas insulated switchgear, and more particularly to a gas insulated switchgear in which the heat gas cooling performance can be improved.

Gas insulated switchgear is installed on very high voltage power lines of several tens kilovolts (kilo volts) to several hundred kilovolts or more, and is used when intentional opening and closing of lines in normal use or when a ground fault or short circuit It is a power device that protects electric power system and electrical equipment by automatically shutting off the line when a large fault current due to shortage occurs. In order to open and shut off the ultra high voltage circuit, the gas insulated switchgear has fixed contacts and movable contacts for opening and closing circuits in a grounded metal container filled with insulating gas.

The construction and operation of one example of the prior art in such a gas insulated switchgear will be described with reference to Figs. 1 and 2. Fig.

1 is a cross-sectional view showing a state of a closed (closed) state as a cross-sectional view of a gas insulated switch according to the prior art, in which half of the lower symmetry about the center line of a single dotted chain line is omitted, and FIG. 2 is a cross- Sectional view showing the cut-off (open) state.

The overall sectional view of the gas insulated switchgear according to the prior art can be referred to, for example, Korean Patent Registration No. 10-0631006 (entitled "Gas Insulated Switchgear Device") registered by the applicant of the present invention.

The gas insulated switchgear according to an example of the prior art is composed of a stationary unit, a movable unit, and an enclosure.

The enclosure 1 is an enclosure for accommodating the components of the gas insulated switchgear, and is filled with an insulated gas having 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 12, and a fixed arc contact 7, and is accommodated in the enclosure 1.

The movable unit includes a cooling cylinder 10, a movable main contact 8, a movable nozzle 6 and a movable arc contact 5, a movable rod 4, an operation link 3, and an actuator ACTUATOR (2). The cooling cylinder 10, the movable main contact 8, the movable nozzle 6 and the movable arc contact 5 and the movable rod 4 are accommodated in the housing 1. The operation link 3 is housed in the housing 1, And the operation unit 2 is located outside the enclosure 1. The operation unit 2 is located outside the enclosure 1. [

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

The cooling cylinder portion 12 is electrically and mechanically connected to the fixed main contact 9 and receives the fixed arc contact 7 therein and absorbs heat from the arc generated when the circuit is opened and closed to cool the arc, (Hereinafter, referred to as thermal gas). The cooling cylinder portion 12 is electrically connected to either the power supply side or the load side of the external power circuit. At the rear of the cooling cylinder (12), there is provided a heat gas outlet (11) for discharging the heat gas into the insulating gas filled between the enclosures (1).

The fixed arc contact 7 is provided in the cooling cylinder 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 Lt; RTI ID = 0.0 > electrically < / RTI > and mechanically separated by a predetermined time delay.

The cooling cylinder 10 is provided with a fixed piston (not shown) fixed on the inner circumferential surface thereof by being in contact with the outer surface of the movable main contactor 8 and electrically connected to each other, Thereby forming a compression chamber. The cooling cylinder 10 is electrically connected to the power supply side of the external power circuit or one side of the load side on the opposite side to the side to which the cooling cylinder 12 is electrically connected. At the rear of the cooling cylinder (10), there is provided a heat gas outlet (11) for discharging the heat gas into the insulating gas filled between the enclosures (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 moved in the same direction together with the movable arc contact 5.

The nozzle 6 is integrally movably provided at the tip of the movable main contact 8 by welding or the like so that when the movable main contact 8 is retracted and the compression chamber is compressed ) The compressed insulated gas is injected toward the fixed arc contact (7) facing it.

The movable arc contact 5 is movably connected together with the movable main contact 8 as described above and is mechanically connected to the operating link 3 in order to receive the driving force.

 The movable rod (4) is a power transmission means that is drive-connected to the external drive source manipulator (2) and connected to transmit power to the movable arc contactor (5). The movable rod 4 is provided with a discharge port 14 for absorbing the heat of the arc that flows back through the nozzle 6 and discharging the heated gas into the cooling cylinder 10.

The actuator 2 is a drive source provided outside the enclosure 1 for providing a linear drive force, for example, a drive source such as an electric motor, a spring for urging the elastic force, a permanent magnet actuator, etc., gears for transmitting the drive force therefrom, a crank ), A link, and the like.

The operation of opening and closing the power circuit of the gas insulated switchgear according to an example of the related art constructed as described above will be briefly described with reference to FIGS.

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

When the 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 contact 5 driven by the movable rod 4, The movable main contactor 8 and the nozzle 6 which are movably connected to the contactor 5 linearly move to the left side toward the fixed arc contactor 7 side in the cooling cylinder 12. [ Therefore, the movable arc contact 5 comes into contact with the fixed arc contact 7, and the movable main contact 8 comes into contact with the fixed main contact 9, so that the power circuit is connected between the power source side and the load side. At this time, since the compression chamber is expanded, there is no injection of the insulating gas toward the fixed arc contact 7.

Next, the operation from the power circuit closed state shown in Fig. 1 to the power circuit open state shown in Fig. 2 will be described.

When the power from the manipulator 2 is transmitted to the movable rod 4 and the movable rod 4 moves linearly to the right as shown in Fig. 1, the movable arc contact 5 driven by the movable rod 4 and the movable arc 4, The movable main contact 8 and the nozzle 6 which are movably connected to the contactor 5 linearly move from the stationary arc contact 7 in the cooling cylinder 12 to the outside. The movable primary contact 8 is first disconnected from the fixed primary contact 9 and subsequently the movable arc contact 5 is also disconnected from the fixed arc contact 7 and the power circuit between the power source side and the load side is opened It is in a cut-off state. At this time, since the compression chamber between the fixed pistons fixed by the movable main contactor 8 which is retreating is compressed, the insulated gas is injected toward the stationary arc contact 7 so as to extinguish the arc.

In addition, the arc is heat-absorbed by the insulating gas, and the hot gas, which has been cooled and becomes hot, is discharged into the enclosure 1 through the heat gas outlet 11 of the cooling tube portion 12 and the arc flowing back through the nozzle 6 The insulating gas in the compression chamber absorbs heat and becomes a heat gas and is discharged into the cooling cylinder 10 through the discharge port 14 and then discharged into the enclosure 1 through the heat gas discharge port 11 of the cooling cylinder 10 do.

In the gas insulated switchgear according to an example of the prior art 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 shut off and the gas insulated switch is re- ) Position of the three-phase AC circuit, there is a problem that the insulation between the circuits of the three-phase AC circuit may be destroyed or a ground fault may occur.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide an improved gas insulated switchgear capable of cooling the temperature of the heat gas flowing out to the enclosure side as much as possible.

The object of the present invention is to provide a gas insulated switchgear,

Enclosure;

A fixed main contact fixedly installed in the enclosure and having a cooling cylinder formed with a heat gas outlet;

A fixed arc contact fixedly installed at an inner central portion of the fixed main contactor so as to extend in the longitudinal direction of the fixed main contactor;

A cooling cylinder which is formed to extend from the fixed main contact and is fixedly installed in the enclosure and has a heat gas discharge port;

An insulating gas filled in the enclosure;

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

And a movable arm contact member 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 contactor and a second position separated from the fixed arc contactor, ;

A movable primary 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 contactor and a position separated from the fixed main contactor;

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

And a second cooling ring which is fixed to the cooling cylinder of the fixed main contact and has a plurality of protrusions and recesses to cool the thermal gas before being discharged through the cooling cylinder thermal gas outlet, And can be achieved by providing a gas insulated switch according to the invention.

The gas insulated switchgear according to the present invention is provided with a cooling plate having a plurality of protruding portions and recessed portions in the movable portion and the fixed portion so that the hot gas can be cooled before the hot gas is discharged to the housing side, It is possible to prevent the occurrence of insulation breakdown and grounding phenomenon.

In the gas insulated switchgear according to the present invention, the recessed portion is spirally formed so as to form a plurality of gas turbulences, so that a mixture of a high-temperature gas and a low-temperature gas around the cooling plate is generated by a plurality of gas turbulences And the temperature of the thermal gas can be cooled by the heat transfer.

1 is a cross-sectional view of a gas insulated switchgear according to the prior art in which a half of a lower symmetry about a center line of a single dot chain line is omitted,
Fig. 2 is a cross-sectional view showing the cut-off (open) state of the gas insulated switch of Fig. 1,
Fig. 3 is a cross-sectional view of a gas insulated switch according to a preferred embodiment of the present invention, in which half of the lower symmetry about the center line of the single dot chain line is omitted,
4 is a partial enlarged view of the gas insulated switch according to Fig.

The above and other objects and features of the present invention will become more apparent from the following description of the preferred embodiments of the present invention with reference to the accompanying drawings.

FIG. 3 is a cross-sectional view of a gas insulated switch according to a preferred embodiment of the present invention, in which half of the lower symmetry is centered about the center line of the single dot chain line, and FIG. 4 is a partial enlarged view of the gas insulated switch according to FIG.

The configuration of the gas insulated switch according to the preferred embodiment of the present invention will be described with reference to Figs. 3 to 4. Fig.

As shown, the gas insulated switchgear includes an enclosure 1, a fixed main contact 9, a fixed arc contact 7, a cooling cylinder 10, a movable rod 4, a movable arc contact 5, (8), a first cooling ring (20b) and a second cooling ring (20a).

The enclosure 1 is filled with an insulating gas therein, and the components constituting the gas insulated switch according to the present invention are accommodated therein. The enclosure (1) is made of a cylindrical tube made of a metal material such as an iron plate, and is grounded to prevent electric safety accidents such as electric shock.

The component parts constituting the gas insulated switchgear according to the present invention provided in the enclosure 1 can be roughly divided into a fixed side unit and a movable side unit, A stationary arc contact 7 and a second cooling ring 20a, and the movable unit is provided with a cooling cylinder 10, a movable rod 4, a movable arc contact 5, (8) and a first cooling ring (20b).

First, the configuration of the component parts included in the fixed-side unit will be described.

The fixed main contact 9 is fixedly installed in the enclosure 1 and has a cooling cylinder 12 in which a heat gas outlet 11 is formed. The fixed main contact 9 and the cooling cylinder 12 are composed of electrical conductors and can be integrally formed or integrally connected to each other. 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 electric conductor fixedly installed in the inner central portion of the fixed main contact 9 so as to extend in the longitudinal direction of the fixed main contact 9. The fixed arc contact 7 minimizes arcing by electrically and mechanically separating the fixed main contact 9 by a predetermined time delay rather than electrically and mechanically separating it from the movable main contact 8.

The configuration of the component parts included in the next movable 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 fixedly installed in the enclosure 1 at a predetermined distance from the fixed main contact 9, And the heat gas discharge port 11 is formed to be opened toward the outer casing 1 side. The cooling cylinder 10 is composed of an electric conductor and can be electrically connected to the power supply side of the external power circuit or the side opposite to the side to which the fixed main contact 9 is connected in the load side. In addition, the cooling cylinder 10 is provided with a fixed piston (not shown) fixed to the inside thereof by being in contact with the outer surface of the movable main contactor 8 to be electrically connected to each other, Thereby forming a gas compression chamber (13).

The movable rod 4 is a rod-shaped power transmission means connected to a drive source and capable of moving forward or backward in a linear direction by a linear driving force provided by the drive source, Directly or indirectly through a connecting member. The driving source is a driving source provided outside the enclosure 1 and serving as a driving source for providing a linear driving force to the movable rod 4, for example, a driving source such as an electric motor, a spring for urging the elastic force, a permanent magnet actuator, A gear for cranking, a crank, a link, and the like. The movable rod 4 is provided with a discharge port 14 for absorbing the heat of the arc that flows back through the nozzle 6 and discharging the heated gas into the cooling cylinder 10.

The movable arc contact 5 is connected to the movable rod 4 and is movable forward or backward by the movable rod 4 moving forward or backward. The movable arc contact 5 is movable between a first position in contact with the fixed arc contact 7, And an electrical conductor movable to a second position separate from the first electrical conductor (7).

The movable main contact 8 is connected to the movable rod 4 and can be moved forward or backward by the movable rod 4 moving forward or backward. The movable main contact 8 is movable between a position where the outer peripheral surface contacts the fixed main contact 9, (9). The movable main contact 8 is composed of a substantially cylindrical electric conductor and is always in contact with the cooling cylinder 10 and electrically connected to the cooling cylinder 10. A nozzle 6 may be attached to the distal end portion of the movable main contactor 8 by welding or the like so as 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 screw fixing. The first cooling ring 20b has a plurality of protruding portions 20a1 (see FIG. 4) and a recessed portion 20a2 (see FIG. 4) on its surface and is discharged through the heat gas outlet 11 on the cooling cylinder 10 Thereby cooling the previous thermal gas (G). 4 shows the structure of the second cooling ring 20a provided in the cooling cylinder 12 of the fixed main contact 9 in detail in enlarged detail. However, in the first cooling ring 20b, It is noted that the recessed portion has the same configuration as the plurality of projecting portions 20a1 and recessed portion 20a2 of the second cooling ring 20a.

The second cooling ring 20a is fixed to the cooling cylinder 12 of the fixed main contact 9 as shown in Fig. 4 of a ring shape and has a plurality of protrusions 20a1 and 20a1 on the surface thereof. And has a groove portion 20a2 to cool the hot gas before being discharged through the hot gas outlet 11 on the cooling cylinder 10.

According to a preferred feature of the present invention, the recessed portion 20a2 in the first cooling ring 20b and the second cooling ring 20a may have a plurality of (many) gas turbulences Flow) G2.

Next, the operation and effect of the gas insulated switchgear according to the preferred embodiment of the present invention constructed as described above will be explained with reference to Figs. 3 to 4. Fig.

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

When the movable rod 4 is moved linearly from the position shown in Fig. 3 to the left, the movable arc contact 5, which is drive-connected to the movable rod 4, And the movable main contact 8 and the nozzle 6 which are movably connected together to the movable arc contact 5 move linearly to the left side toward the fixed main contact 9 and fixed arc contact 7 side. Therefore, the movable arc contact 5 comes into contact with the fixed arc contact 7, and the movable main contact 8 comes into contact with the fixed main contact 9, so that the power circuit is connected between the power source side and the load side. At this time, since the compression chamber 13 is expanded, there is no injection of the insulating gas toward the fixed arc contact 7.

Next, the operation from the power circuit closed state described above to the power circuit open state shown in Fig. 3 will be described.

3, when the power from the driving source (not shown) is transmitted to the movable rod 4 and the movable rod 4 is linearly moved to the right as shown in Fig. 3, the movable arc contact 5 And the movable main contact 8 and the nozzle 6 which are movably connected to the movable arc contact 5 are arranged in a straight line from the stationary main contact 9 and the fixed arc contact 7 in the cooling cylinder 12 to the right Move. The movable primary contact 8 is first disconnected from the fixed primary contact 9 and subsequently the movable arc contact 5 is also disconnected from the fixed arc contact 7 and the power circuit between the power source side and the load side is opened It is in a cut-off state. At this time, since the compression chamber 13 between the fixed pistons fixed by the movable main contactor 8 which is retreating is compressed, the insulated gas is injected toward the fixed arc contact 7 so as to extinguish the arc.

The arc heat is absorbed by the insulating gas and is cooled and heated. The hot gas 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 backward through the nozzle 6 absorbs the heat of the insulating gas in the compression chamber and becomes a heat gas and is discharged into the cooling cylinder 10 through the discharge port 14, And is discharged into the enclosure 1 through the discharge port 11.

According to the present invention, the second cooling ring 20a and the plurality of projections 20a1 and 20a2 of the first cooling ring 20b according to the present invention, before the heat gas G is discharged through the heat gas outlet 11, The hot gas G is cooled while being contacted with the long groove 20a2 along the long surface distance and the thermal gas cooled by the spiral grooved portion 20a2 forms gas turbulence G2 like a number of tornadoes do. This gas turbulence G2 promotes the mixing of the high temperature thermal gas G1 with the conventional insulating gas at a relatively low temperature and cools the temperature of the heat gas by the heat transfer so that it is discharged through the heat gas outlet 11 into the enclosure 1 do.

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

1: Enclosure 2: Actuator
3: Operation link 4: Running rod
5: movable arc contactor 6: nozzle
7: stationary arc contactor 8: movable main contactor
9: Fixed main contactor 10: Cooling trough
11: heat gas outlet 12: cooling cylinder
13 compression chamber 14 outlet

Claims (2)

A gas insulated switchgear comprising:
An enclosure in which an insulating gas is filled;
A fixed main contact fixedly installed in the enclosure and having a cooling cylinder formed with a heat gas outlet;
A fixed arc contact fixedly installed at an inner central portion of the fixed main contactor so as to extend in the longitudinal direction of the fixed main contactor;
A cooling cylinder which is fixedly installed in the enclosure at a predetermined distance from the fixed main contact and has a heat gas outlet;
A movable rod (MOVABLE ROD) capable of moving forward or backward in a linear direction by a linear driving force from a driving source;
And a movable arm contact member 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 contactor and a second position separated from the fixed arc contactor, ;
A movable primary 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 contactor and a position separated from the fixed main contactor;
A first cooling ring which is fixed by the connection method including welding and screw fixing to the cooling cylinder and has a plurality of projections and recesses to cool the thermal gas before being discharged through the cooling normal heat gas outlet; And
And a second cooling ring fixed to the cooling cylinder of the fixed main contact and having a plurality of protrusions and recesses to cool the thermal gas before being discharged through the cooling cylinder thermal gas outlet, switch. The method according to claim 1,
Wherein the recess is spirally formed to form a plurality of gas turbulences.

Images