KR20110076538A - Solid insulated type vacuum circuit breaker - Google Patents

Abstract

PURPOSE: A solid insulated shield combination type vacuum circuit breaker is provided to exclude the use of SF6(Sulfur hexafluoride) gas by injection-molding epoxy insulation materials to have an insulated housing. CONSTITUTION: A fixed connection conductor(110) is connected to a lead-in cable. A movable connection conductor(120) is electrically connected to a disconnecting switch. A vacuum valve(200) is located between the fixed connection conductor and the movable connection conductor. A pair of main shield units(310,320) are bended to surround the edges of the vacuum valve. An insulated housing(400) surrounds the outer sides of the fixed connection conductor, the movable connection conductor, and the vacuum valve.

Description

Solid insulated type Vacuum Circuit Breaker

The present invention relates to a vacuum circuit breaker, and more specifically, by using an epoxy resin, which is a main insulating material, to realize earth-to-earth and pole-to-pole insulation, and does not use SF6 gas, and increases the electric field of a portion where the electric field strength increases. The present invention relates to a new type of solid insulated vacuum circuit breaker which can be prevented to improve insulation performance.

In general, Gas Insulation Switchgear (GIS) uses insulation gas (SF6) with excellent insulation performance and arc extinguishing function in a metal sealed container (tank) as an insulating medium to store conductors and various protective devices for reliability. It is an improved water substation facility, and is composed of various components such as vacuum circuit breaker, disconnecting switch, and earthing switch.

The vacuum breaker of the gas insulated switchgear serves to determine the power supply and interruption through the bus, and the blocking operation is controlled by the manipulator.

Existing general vacuum circuit breaker is composed of an insulating housing having a large appearance, a vacuum valve provided in the insulating housing and a movable contact and a fixed contact are installed corresponding to each other in the vacuum valve, the movable contact by the movable shaft Is selectively moved to energize the fixed contact.

In this case, the insulating housing is configured to perform the ground-to-earth insulation in a state where SF6 gas, which is an insulating medium, is filled.

However, the above-described vacuum circuit breaker according to the related art has a disadvantage in that reliability for safety is not high because there is always a fear of dielectric breakdown due to conductive foreign matter.

In particular, SF6 gas used as an insulating medium is a material that causes environmental pollution, and in recent years, the development of a structure that can replace the SF6 gas due to the use regulations for the environmental pollutant is urgently developed.

The present invention has been made to solve the various problems according to the prior art described above, the object of the present invention is to implement the insulation between the earth and the pole by using an epoxy resin and not using SF6 gas and the electric field strength The present invention provides a new type of solid insulated shield-coupled vacuum circuit breaker that provides an additional high-voltage shield to prevent the electric field rise in the rising area to improve the insulation performance.

Solid insulation shield coupled vacuum circuit breaker of the present invention for achieving the above object is a fixed connection conductor connected to the lead cable; A movable connection conductor disposed to be spaced apart from the fixed connection conductor on a horizontal line and electrically connected to the disconnecting unit; It is located between the fixed connection conductor and the movable connection conductor, the fixed electrode in the state of energized with the fixed connection conductor, the inner space is selectively installed on the fixed electrode while being horizontally movable in the state of energized with the movable connection conductor A vacuum valve having a movable electrode connected thereto; A pair of main shields, one end of which is coupled to an opposite wall surface between the fixed connection conductor and the movable connection conductor, and the other end of which is bent to surround an end edge portion of the vacuum valve; And an insulating housing made of an epoxy insulator formed to form an appearance of the vacuum circuit breaker while surrounding the outside of the fixed connection conductor, the movable connection conductor, the vacuum valve, and the main shield through a molding process.

Here, the end of each of the main shield portion is characterized in that it is formed to be inwardly bent round.

In addition, the vacuum valve is composed of two high-voltage electrode portion which is respectively energized with a fixed connection conductor and a movable connection conductor, and a cylindrical body end formed of a ceramic insulator for insulation and support of the two high-voltage electrode portion, forming the both ends, Each main shield portion is formed so as to protrude to the extent that it can cover the edge portion of the body end beyond the position of the high voltage electrode portion.

In addition, the insulating housing is coupled to the cable portion while forming one end and the cable coupling end is formed with a first opening for insertion of the cable is inserted, the other end is coupled to the manipulator while forming the other end and the insulating rod is penetrated to be connected to the movable electrode A rod through end having a second opening formed therein, and a disconnector connecting end having a third opening formed on the circumferential surface between the cable coupling end and the rod through end, coupled to the disconnecting unit and electrically connected between the disconnecting unit of the disconnecting unit and the movable connection conductor. And a secondary shield part bent to wrap around a portion where each opening hole of the insulating housing is formed on a wall surface opposite to the wall surface to which each main shield part is coupled among both wall surfaces of the respective connecting conductors. Characterized in that configured.

As described above, the solid insulation shield-coupled vacuum circuit breaker of the present invention eliminates the use of SF6 gas by injection molding an epoxy insulation to form an insulation housing, thereby making it possible to manufacture environmentally friendly products. Has

In particular, although the insulating housing and the other components (each connecting conductor and the vacuum valve, etc.) are made of different materials from each other, the additional configuration of the shield part reduces the concentration phenomenon of the electric field and improves the partial discharge characteristics. Accordingly, the peeling phenomenon between the dissimilar materials can be prevented and the dielectric breakdown can be prevented.

Hereinafter, a preferred embodiment of the solid insulation shield coupled vacuum circuit breaker of the present invention will be described with reference to FIGS. 1 to 3.

1 is a view illustrating the entire structure of a switchgear for a drainage apparatus provided with a solid insulation shield coupled vacuum circuit breaker according to an exemplary embodiment of the present invention, and FIGS. 2 and 3 illustrate a vacuum circuit breaker according to an exemplary embodiment of the present invention. The structure for is shown.

As shown in the drawing, the vacuum circuit breaker 1 according to the exemplary embodiment of the present invention has a fixed connection conductor 110, a movable connection conductor 120, a vacuum valve 200, and a pair of main shields 310 and 320. And an insulating housing 400.

This will be described in more detail below for each configuration.

First, the fixed connection conductor 110 is a series of configuration that receives the current through the lead cable 11 while the lead cable 11 of the cable portion 10 is connected.

At this time, the front of the fixed connection conductor 110 (the left side on the drawing) is formed through the coupling hole 111 to form a coupling portion with the lead cable 11 and the coupling electrode 240 to be described later. do.

Next, the movable connection conductor 120 is a series of components that are electrically connected to the disconnecting unit (not shown) of the disconnecting unit 20 and support the horizontal movement of the movable electrode 250 to be described later.

The movable connection conductor 120 is disposed to be spaced apart from the fixed connection conductor 110 on a horizontal line.

In addition, a connection end (not shown) for electrical connection with the disconnector is formed on a circumferential surface of the movable connection conductor 120, and the movable electrode (at the center side of the movable connection conductor 120). Through-holes 122 are formed to penetrate the 240 and to be connected to the insulating rod 31.

In this case, the insulating rod 31 is a series of configurations to contact the movable electrode 250 to the fixed electrode 240 or to short-circuit while moving horizontally in accordance with the operation of the manipulator (not shown).

Next, the vacuum valve (Vacuum Interrupter) 200 serves to selectively block or energize the current drawn through the fixed connection conductor 110 to provide to the movable connection conductor 120. Configuration.

The vacuum valve 200 is composed of a pair of high voltage electrode portions 210 and 220 forming both ends, and a cylindrical body end 230 wrapped around the two high voltage electrode portions 210 and 220 to insulate and support the body. Inside the stage 230, a fixed electrode 240 that is energized with the fixed connection conductor 110 and a movable electrode 250 that is energized with the movable connection conductor 120 are installed to correspond to each other.

At this time, the pair of high voltage electrode parts 210 and 220 are fixed side high voltage electrode parts 210 which are energized with the fixed connection conductor 110 and movable side high pressure electrode parts 220 which are energized with the movable connection conductor 120. The fixed side high voltage electrode part 210 is energized with the fixed electrode 240 and the movable side high pressure electrode part 220 is configured to be energized with the movable electrode 250.

In particular, the movable electrode 250 is connected to the insulating rod 31 which is horizontally moved through the through-hole 122 of the movable connecting conductor 120, the fixed electrode by the operation of the insulating rod 31 Optionally contact or short circuit 240.

In addition, the body end 230 is formed of a ceramic insulator to insulate and support the two high voltage electrode portions 210 and 220.

Next, each of the main shields 310 and 320 is a series of components that prevent the increase of the strength of the electric field generated through the corner portions of both ends of the vacuum valve 200 and improve the partial discharge characteristics.

The main shields 310 and 320 are formed by bending a flat plate into a cylindrical shape, each of which is fixedly coupled to an opposite wall surface between the fixed connection conductor 110 and the movable connection conductor 120.

At this time, one end of the main shield portion (310, 320) is coupled to each wall surface of the fixed connection conductor 110 and the movable connection conductor 120, and the other end is directed toward the opposite direction between the connection conductors (110, 120) from the wall surface. While being bent, it is formed to surround an end edge portion of the vacuum valve 200.

In particular, the other end of the main shield portion (310,320) is formed to a length enough to cover the edge portion of the body end 230 beyond the position of the high-pressure electrode (210,220) constituting the vacuum valve 200. .

That is, considering that both edge portions of the high voltage electrode portions 210 and 220 forming the vacuum valve 200 are formed at an acute angle or a right angle shape, the electric field stress is concentrated due to the high pressure in the corresponding region. An interface or a crack may be generated between the insulating housing 300 made of an epoxy insulating material and each of the high voltage electrode parts 210 and 220. As a result, an electric field strength may be increased and a breakdown voltage characteristic may be lowered to cause breakdown. .

Therefore, by providing each of the main shields 310 and 320 in the form of wrapping the corresponding portion in a portion where the concentration of the electric field occurs (a corner portion of the high voltage electrode portion), the field concentration stress can be reduced.

In addition, it is more preferable that the end portions of the other ends of each of the main shield portions 310 and 320 are rounded and bent inward, so that an electric field concentration phenomenon due to an acute angle formed by the ends is prevented. .

Next, the insulating housing 400 is a part forming the appearance of the vacuum circuit breaker 1, and the fixed connection conductor 110, the movable connection conductor 120, the vacuum valve 200, and each main shield through a molding process. It is formed to surround the outside of the parts 310 and 320 to form the appearance of the vacuum circuit breaker 1, and is made of an epoxy insulator.

That is, the insulating housing 400 is formed of epoxy insulating material in a state in which the fixed connection conductor 110, the movable connection conductor 120, the vacuum valve 200, and the main shield portions 310 and 320 are seated on a mold mold. It is formed by injection.

The insulating housing 400 of such a structure is not to implement the ground-to-earth insulation through a separate insulation medium, such as SF6 gas, but to enable the ground-to-ground insulation itself while performing the role of the insulation medium itself.

That is, the outer surface of the insulating housing 400 and the portion between the fixed connection conductor 110, the movable connection conductor 120, the vacuum valve 200, and the main shield portions 310 and 320 do not form an empty space. The site is filled with an epoxy insulator to enable earth-to-earth insulation.

The insulating housing 400 forms one end and forms a cable engaging end 410 having a first opening 411 formed therein so as to be coupled to the cable unit 10 and an insertion cable 11 to be inserted therein, while forming the other end. A rod through end 420 formed with a second opening 421 through which an insulating rod 31 penetrates and is connected to an operator (not shown) and connected to the movable electrode 250, and the cable coupling end ( The third opening is formed on the circumferential surface between the 410 and the rod through end 420 and is coupled to the disconnecting unit 20 and is electrically connected between the disconnecting unit of the disconnecting unit 20 and the movable connection conductor 120. 431 is configured to include a disconnecting terminal connecting end 430 is formed.

In the following, the operation of the vacuum circuit breaker 1 according to the embodiment of the present invention described above will be described in more detail.

First, during operation of a normal gas insulated switchgear (GIS), the movable electrode 250 and the fixed electrode 240 are energized while being in contact with each other, as shown in FIG. 2, whereby the lead cable of the cable unit 10 ( 11) the current provided through the fixed circuit breaker 110, the electrodes 240, 250, and the movable connection conductor 120 of the vacuum circuit breaker 1 is sequentially provided to the disconnector 20.

In particular, during the above-described series of processes, electric field concentration occurs at the corners of the pair of high voltage electrode parts 210 and 220 through which the high voltage current flows in the vacuum breaker 1.

However, considering that the edge portions of the high voltage electrode portions 210 and 220 are surrounded by the main shield portions 310 and 320 coupled to the connection conductors 110 and 120, the electric field concentration phenomenon occurs at the edge portions. Since the sustainability of the main shields 310 and 320 is constrained by the main shields 310 and 320, the electric field concentration stress may be reduced, and thus partial discharge may be reduced even in the continuous operation state.

In addition, the insulating performance of the insulating housing 400 may be further supplemented by the epoxy insulating material filled between the corner portion and each of the main shield portions 310 and 320.

Therefore, the peeling phenomenon on the interface between the insulating housing 400 made of different materials and each of the high voltage electrode parts 210 and 220 can be prevented.

On the other hand, when the abnormal current is generated in the system during the normal operation described above, or when the current needs to cut off for maintenance, the operation control for the manipulator is made.

That is, as the operation of the manipulator is performed, the retraction operation of the insulating rod 31 is performed. As a result, the short circuit of the current is caused by the movable electrode 250 connected to the insulating rod 31 being separated from the fixed electrode 240. Is done. This is as shown in Figure 3 attached.

Therefore, the high voltage current provided from the inlet cable 11 of the cable part 10 is blocked from being provided to the disconnector 20.

As a result, the vacuum circuit breaker 1 of the present invention which performs the above-described series of operations requires the use of SF6 gas by injection molding an epoxy insulator to form an insulating housing 400, thereby making it possible to manufacture environmentally friendly products. Has the advantage enabled.

In particular, although the insulating housing 400 and the other components (each connecting conductor and the vacuum valve, etc.) are made of different materials from each other, the concentration of the electric field strength is reduced by the additional configuration of the shield portions 310 and 320. In addition, as the partial discharge characteristic is improved, the peeling phenomenon between the dissimilar materials can be prevented and the dielectric breakdown can be prevented.

On the other hand, the vacuum circuit breaker 1 according to the embodiment of the present invention described above also in the cable coupling end 410 in which the electrical connection between the fixed connection conductor 110 and the incoming cable 11 of each portion of the insulating housing 400 is made. Due to the continuous rise of the temperature due to the application of a high voltage current may cause a peeling phenomenon at the interface between the fixed connection conductor 110 and the insulating housing 400, due to which the electric field strength also rises in the corresponding area may cause a concentration phenomenon Can be.

Therefore, in the exemplary embodiment of the present invention, the other end of the fixed connection conductor 110 has one end fixed to the wall surface of the side wall to which the inlet cable 11 is connected, and the other end thereof is connected to the inlet direction of the inlet cable 11. It is further suggested that a separate auxiliary shield portion 510 formed to be bent toward is further included.

That is, by improving the partial discharge characteristics of the corresponding portion by the auxiliary shield 510, the electric field concentration phenomenon can be reduced, thereby preventing breakdown of the cable coupling end 410 of the insulating housing 400. I would have to.

Of course, the auxiliary shield 520 may be further included in the wall surface of the side wall through which the insulating rod 31 penetrates from both side walls of the movable connection conductor 120, as shown in the drawing. The shield part 520 serves to prevent dielectric breakdown of the rod through end 420 of the insulating housing 400.

1 is a schematic diagram showing the installation of a solid insulation shield coupled vacuum circuit breaker according to a preferred embodiment of the present invention;

2 is a cross-sectional view showing in more detail the internal structure of the solid insulation shield coupled vacuum circuit breaker in a preferred embodiment of the present invention;

3 is a cross-sectional view showing a state in which the electrodes of the solid insulation shield-coupled vacuum circuit breaker are short-circuited with each other in a preferred embodiment of the present invention.

Explanation of symbols for main parts of the drawings

1. Vacuum breaker 110. Fixed connection conductor

111. Coupling hole 120. Movable connecting conductor

122. Through hole 200. Vacuum valve

210. Fixed side high pressure electrode 220. Movable side high voltage electrode

230. Body end 240. Fixed electrode

250. Moving electrodes 310,320. Main shield

400. Insulated housing 410. Cable mating ends

411. First opening 420. Rod through end

421. Second opening 430. Disconnector connection end

431. The third opening 510,520. Auxiliary shield

Claims (4)

A fixed connection conductor connected to the incoming cable; A movable connection conductor disposed to be spaced apart from the fixed connection conductor on a horizontal line and electrically connected to the disconnecting unit; It is located between the fixed connection conductor and the movable connection conductor, the fixed electrode in the state of energized with the fixed connection conductor, the inner space is selectively installed on the fixed electrode while being horizontally movable in the state of energized with the movable connection conductor A vacuum valve having a movable electrode connected thereto; A pair of main shields, one end of which is coupled to an opposite wall surface between the fixed connection conductor and the movable connection conductor, and the other end of which is bent to surround an end edge portion of the vacuum valve; Solid insulation comprising: an insulating housing made of a fixed insulating conductor, a movable connecting conductor, a vacuum valve, and an epoxy insulating material formed to form an appearance of a vacuum circuit breaker by surrounding the outside of the main shield part through a molding process. Shield-coupled vacuum breakers. The method of claim 1, Solid end shield coupled vacuum circuit breaker, characterized in that the end of each main shield is rounded and formed inwardly bent. The method of claim 2, The vacuum valve is composed of a cylindrical body end formed of a ceramic insulator for insulating and supporting the two high voltage electrode portions, each of which is energized with a fixed connection conductor and a movable connection conductor, respectively forming an extreme end, Each of the main shields is formed so as to protrude to the extent that it can cover the edge portion of the body end beyond the position of the high voltage electrode portion, the solid insulated shield coupled vacuum circuit breaker. 4. The method according to any one of claims 1 to 3, The insulating housing is coupled to the cable portion while forming one end, and a cable coupling end having a first opening formed therein for insertion of the cable, and a second end through which the insulating rod penetrates to be connected to the movable electrode. A rod through end formed with an opening hole, and a disconnector connecting end having a third opening formed on a circumferential surface between the cable coupling end and the rod through end, coupled to the disconnecting unit and electrically connected between the disconnecting unit of the disconnecting unit and the movable connection conductor; Configured by A solid surface characterized in that the side of the opposite side of the wall surface of each of the connecting conductors of the connecting conductor is coupled to each other further comprises an auxiliary shield formed bent to surround the periphery of the respective opening hole formed in the insulating housing Insulated shield-coupled vacuum circuit breaker.

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