KR20200107644A - Gas circuit breaker of a gas insulated switchgear - Google Patents

Abstract

The present invention relates to a gas circuit breaker of a gas insulated switchgear capable of preventing foreign substances generated in the gas circuit breaker from floating in a state attached to an insulation housing. According to the present invention, by having a structure capable of collecting foreign substance particles in a part in which the foreign substances are mainly generated and preventing the foreign substances from floating, electric field distortion and insulation breakdown due to the foreign substance floating can be prevented. To this end, the gas circuit breaker of a gas insulated switchgear comprises: the insulation housing; a fixed unit; a movable unit; an insulation bucket; and a foreign substance collection unit.

Description

Gas circuit breaker of a gas insulated switchgear}

The present invention relates to a gas circuit breaker of a gas insulated switchgear capable of preventing foreign substances generated in a gas circuit breaker from being floated in a state attached to an insulating housing.

In order to stably supply power to each power load that consumes power after generating power in a power plant, an ultra-high voltage GIS (Gas Insulated Switchgear) is installed at each substation. GIS is a power device that can transmit and distribute efficiently by stably protecting the system in case of an accident in the power system. GIS uses insulating gas for insulation and external temperature blocking. Ultra-high voltage GIS is GCB (Gas Circuit Breaker), DS (Disconnecting Switch, Disconnector), ES (Earthing Switch, Earthing Switch) HSES (High Speed Earthing Switch, High Speed Earthing Switch), Bushing, Cable and GIB (Gas Insulated Bus) duct, gas insulated booth duct), etc.

Among them, GCB (Gas Circuit Breaker) is an electric device that protects the power system and load by safely blocking the current in case of manually opening or closing a line or trip operation due to an accident current such as a ground fault or short circuit. to be. The gas circuit breaker separates the electrode by receiving power from an externally connected manipulator. At this time, the arc is blocked and extinguished by injecting an insulating gas into the arc generated between the contacts. The gas injected into the arc between the contacts absorbs heat from the high-temperature arc, and in this process, the electrical conductivity of the arc is removed, so that the block is made.

Gas circuit breakers are largely divided into a puffer method and a complex extinguishing method according to the configuration and blocking method of the blocking unit. The popper method is a method of extinguishing the arc by compressed heat gas, and the complex extinguishing blocking method is a blocking method that combines the existing popper method and thermal expansion method. An example of a nozzle structure, which is a major part of the above-described purpur type gas circuit breaker, is disclosed in Korean Patent Publication 10-2016-0141580 (published on December 9, 2016).

The puffer-type gas circuit breaker 100 of the prior literature includes a fixed part provided with a fixed arc contact 22 and a fixed main contact 23, and selectively contacted or separated from the fixed part, and the movable arc contact 32 and the movable part It includes a movable part provided with the main contact (33). The movable portion slides into contact with the fixed portion or is separated from the fixed portion.

In the gas circuit breaker having the above-described configuration, non-conductive and conductive foreign substances are generated during assembly and transportation processes, and during a switching operation in which friction occurs due to sliding motion. The generated foreign matter is scattered and stacked inside the insulating housing (not shown) of the gas circuit breaker.

In the case where the switching direction of the gas circuit breaker is arranged perpendicular to the installation surface as in the prior literature, a problem such as electric field distortion due to foreign material particles does not occur because the switching part and the part where the foreign material are stacked are far away.

However, in a gas circuit breaker in which the switching direction is arranged horizontally with the installation surface, a problem may occur because foreign matter particles fall and adhere to the inside of the insulating housing because the distance to the foreign matter is close.

In more detail, when the voltage applied to the gas insulated switchgear exceeds a certain value, foreign matters rise from the attachment surface of the insulating housing. When the applied voltage increases, the standing foreign matter particles float and float. These foreign particles may cause distortion in the electric field and cause insulation breakdown.

It is impossible to completely prevent the occurrence of foreign matter during assembly, transportation and switching operations. In particular, the most foreign matter is generated during initial operation switching, so the foreign matter generated by repeating the switching operation more than a certain number of times after assembly and transportation is cleaned and installed on site. However, it is impossible to prevent the occurrence of foreign matter after installation on site. Therefore, there is a need for a method to prevent injuries of foreign substances generated after installation on site.

It is an object of the present invention to provide a gas circuit breaker of a gas insulated switching device capable of preventing foreign substances generated in a gas circuit breaker from floating in a state attached to an insulating housing.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention that are not mentioned can be understood by the following description, and will be more clearly understood by examples of the present invention. In addition, it will be easily understood that the objects and advantages of the present invention can be realized by the means shown in the claims and combinations thereof.

The gas circuit breaker of the gas insulated switchgear according to the present invention includes an insulating housing filled with insulating gas; A fixing part fixed inside the insulating housing and having a contact point; A movable part installed inside the insulating housing and provided with a contact point that contacts or separates from the contact point of the fixed part, and a nozzle for injecting extinguishing gas when separated from the contact point of the fixed part; An insulating tube installed at a contact portion between the contact points of the fixed portion and the movable portion, enclosing the contact portion between the contacts, and having a through hole through which the extinguishing gas is discharged; And a foreign material collecting unit formed on the insulating housing, provided under the insulating tube, and stacking foreign material particles discharged through the through hole.

The insulating housing is characterized in that the longitudinal direction is horizontally disposed on the installation surface.

A collection container integrally formed with the insulating housing and protruding to the outside of the insulating housing to form an accommodation space; And a blocking wall provided on the upper part of the collection container and having a hollow through which the foreign material particles fall, and blocking a part of the collection container from the upper side.

The insulating cylinder is characterized in that the through hole faces a lower side of the insulating housing, and the blocking wall is formed such that the hollow corresponds to the position of the through hole of the insulating cylinder.

The barrier wall has a size corresponding to the size of the through hole.

The foreign material blocking unit further includes a cover coupled to the lower end of the collection container so as to be openable.

The barrier wall is characterized in that the insulating material.

The gas circuit breaker of the gas insulated switchgear according to the present invention can prevent electric field distortion and insulation breakdown due to foreign matter injury by collecting foreign material particles in a part where foreign matter mainly occurs and preventing injury.

In addition, since the gas circuit breaker of the gas insulated switchgear according to the present invention is located in a portion where a foreign material collection portion can secure a sufficient insulating distance from a contact point, electric field distortion and insulation breakdown can be prevented.

In addition to the above-described effects, specific effects of the present invention will be described together while describing specific details for carrying out the present invention.

1 is a cross-sectional view showing a gas circuit breaker of a gas insulated switching device according to an embodiment of the present invention.
2 is an enlarged cross-sectional view of a main part of the gas circuit breaker according to FIG. 1.
3 is a perspective view showing a foreign material collection unit according to the present invention.
4 is a cross-sectional view showing a foreign material collection unit according to FIG. 3.
5 is a perspective view showing a foreign material collection unit according to another embodiment of the present invention.

The above-described objects, features, and advantages will be described later in detail with reference to the accompanying drawings, and accordingly, one of ordinary skill in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of known technologies related to the present invention may unnecessarily obscure the subject matter of the present invention, a detailed description will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar elements.

Hereinafter, it means that an arbitrary component is disposed on the "top (or lower)" of the component or the "top (or lower)" of the component, the arbitrary component is arranged in contact with the top (or bottom) of the component. In addition, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

In addition, when a component is described as being "connected", "coupled" or "connected" to another component, the components may be directly connected or connected to each other, but other components are "interposed" between each component. It is to be understood that "or, each component may be "connected", "coupled" or "connected" through other components.

1 is a cross-sectional view showing a gas circuit breaker of a gas insulated switching device according to an embodiment of the present invention. 2 is an enlarged cross-sectional view of a main part of the gas circuit breaker according to FIG. 1. 3 is a perspective view showing a foreign material collection unit according to the present invention. 4 is a cross-sectional view showing the foreign material collecting unit according to FIG. 3 (hereinafter, for convenience, the longitudinal direction of the insulating housing is defined as a left-right direction and a direction orthogonal to the longitudinal direction is defined as an up-down direction based on FIG. Since the configuration is a known technology, only the configuration related to the present invention will be briefly described).

First, the main configuration of the gas circuit breaker will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1, the gas circuit breaker 10 of the gas insulated switchgear according to an embodiment of the present invention includes an insulating housing 100 largely filled with insulating gas, and a fixed inside the insulating housing 100. The top 200, the fixed part support 300 for supporting the fixed part 200, the movable part 400 selectively contacted or separated from the fixed part 200, and a movable part support for supporting the movable part 400 ( 500).

The insulating housing 100 forms an accommodation space therein, and an insulating gas is filled in the accommodation space. The insulating housing 100 is disposed so that the longitudinal direction is horizontal to the installation surface. The above-described fixed part 200 and fixed part support 300, movable part 400, and movable part support 500 are accommodated in the receiving space of the insulating housing 100. The parts where the contact is made are connected by a cylindrical insulating tube 800.

The fixed part 200 includes a fixed arc contact 210 and a fixed main contact 230. The fixing part 200 is coupled to the fixing part support 300 and fixed within the insulating housing 100. The fixing part 200 and the fixing part support 300 are disposed along the length direction of the insulating housing 100.

The movable part 400 includes a movable part arc contact 410 and a movable part main contact 430. The movable part 400 is coupled to the movable part support 500 to be coupled into the insulating housing 100. A part of the movable part 400 is installed to be movable toward the fixed part 200 by the cylinder part 600. The movable part support 500 is coupled with a puffer cylinder 610 to be described later via a wear ring 510 and a support spring 530.

The cylinder part 600 includes a puffer cylinder 610, a cylinder rod 630, and at least one nozzle 650. The movable arc contact 410 and the movable main contact 430 are provided at one end of the cylinder rod 630, and the other end of the cylinder rod 630 is coupled to the movable rod 700 receiving an external driving force. The cylinder rod 630 moves together with the puffer cylinder 610 in a coupled state by being partially inserted into the puffer cylinder 610. A nozzle 650 is provided at an end of the purpur cylinder 610 and an end of the cylinder rod 630 adjacent to the movable arc contact point 410. The arc extinguishing gas is injected through the nozzle 650.

Both ends of the insulating tube 800 are coupled to the fixed part support 300 and the movable part support 500 by a movable rod 700. The insulating cylinder 800 has a through hole 830 formed in a portion of the insulating cylinder 800 adjacent to a portion where contact is made. The through hole 830 is formed toward the inner peripheral surface of the insulating housing 100. Soho gas, which will be described later, is discharged through the through hole 830.

The gas circuit breaker 10 having the above-described configuration, when the movable rod 700 moves toward the movable part 400 by an external driving force when energized, the cylinder rod 630 and the pupy cylinder 610 connected to the movable rod 700 ) Moves toward the fixing part 200. Accordingly, the movable part arc contact 410 and the movable part main contact 430 move toward the fixed part 200. When blocked, the movable rod 700 moves in the opposite direction so that the movable arc contact 410 and the movable main contact 430 are moved away from the fixed part 200.

When energized, the movable arc contact 410 contacts the fixed arc contact 210 and then the movable main contact 430 contacts the fixed main contact 230. Since the movable arc contact 410 contacts the fixed arc contact 210 first, a peak voltage that may occur during energization may be reduced. Thereafter, a current can stably flow through the main contact 230 of the fixed part and the main contact 430 of the movable part through which most of the electric current flows.

Conversely, when an abnormality occurs in the circuit system or it is necessary to cut off for inspection, the movable part main contact 430 is first separated from the fixed part main contact 230 to reduce the amount of electric current, and then the movable part arc contact 410 is separated.

When the movable arc contact 410 is separated from the fixed arc contact 210, an arc is generated by the inertia of the energized current. Since high temperature and high pressure heat is generated around the arc by the arc, the extinguishing gas filled in the inner part of the puffer cylinder 610 is injected through the nozzle 650 to extinguish this.

In the above-described switching operation (contact and separation of the contacts), the main components of the movable part 400 slide along the length direction of the insulating housing 100. Since the puffer cylinder 610 is plated with silver on the outside, the plated surface is worn as the switching operation is repeated. Therefore, conductive foreign substances such as silver particles are generated by the wear of the surface. In addition, wear ring powder, which is non-conductive foreign material particles and spring powder, which are conductive particles, may be generated at frictional portions such as the wear ring 510 and the support spring 530.

The foreign material particles generated in this way fall by the action of gravity, so they pass through the through hole 830 of the insulating tube 800 and fall into the foreign material collection unit 900.

As shown in FIGS. 2 to 4, the foreign material collection unit 900 includes a collection container 910 disposed below the through hole 830 and a blocking wall 930 provided above the collection container 910. And, it includes a cover 950 provided in the lower portion of the collection container 910.

The collection container 910 is disposed under the through hole 830 through which foreign material particles are mainly dropped. The collection container 910 is formed to protrude to the outside of the insulating housing 100 so as to secure a sufficient insulating distance with a contact portion between the contacts inside the insulating container 800. The collection container 910 may be formed in a cylindrical shape, and forms a predetermined accommodation space therein. Falling foreign matter particles are stacked in the collection container 910.

The collection container 910 may be integrally formed on the insulating housing 100. Since the collecting container 910 is formed on the insulating housing 100, the collecting container 910 may be made of the same material as the insulating housing 100. The collection container 910 has a shape in which the upper and lower ends are open. A blocking wall 930 is provided on the top of the collection container 910 to prevent the foreign matter particles from being injured. A cover 950 is coupled to the lower portion of the collection container 910 so as to be open and close. The collection container 910 is closed by the cover 950, although the bottom is open. The cover 950 serves as the bottom of the collection container 910.

The blocking wall 930 is formed integrally or coupled to the upper end of the cylindrical collection container 910. The blocking wall 930 may have a shape partially covering the open upper end of the collection container 910. In the present invention, the blocking wall 930 may be in the form of a disk in which a hollow is formed in a portion where foreign material particles mainly fall. That is, the blocking wall 930 may have a donut shape as in FIG. 4. The reason why the barrier wall 930 has a hollow is to secure a passage through which foreign substances fall. Therefore, it is preferable that the hollow has a size corresponding to at least the size of the through hole 830 formed in the insulating tube 800.

In addition, the blocking wall 930 may have a plate surface disposed parallel to the upper end of the collection container 910 with reference to FIG. 3. It is preferable that the blocking wall 930 is made of a material capable of securing insulation performance. For example, the barrier wall 930 may be made of a material such as epoxy. If the blocking wall 930 is not an insulating material, the insulating performance may be adversely affected by the blocking wall 930 as well. However, since the blocking wall 930 is an insulating material, insulating performance can be secured even if conductive foreign material particles are attached to the blocking wall 930.

In addition, the blocking wall 930 has a hollow for the fall of foreign matter particles, but since the hollow portion protrudes to the outside of the insulating housing 100, the blocking wall 930 has a larger gap than the interval between the blocking wall 930 and the switching portion. Therefore, even if the foreign material particles float toward the hollow, the foreign material collection unit 900 has a sufficient insulating distance from the switching part, so that electric field distortion caused by the foreign material particles can be minimized.

When the voltage applied to the gas circuit breaker 10 exceeds a certain value while the foreign material particles are stacked on the collection container 910, the foreign material particles may stand up and float inside the insulating housing 100. However, since the blocking wall 930 is provided on the upper portion of the collection container 910, even if foreign matter particles float, they collide with the blocking wall 930 and sink again. In addition, since the blocking wall 930 is an insulating material, it is possible to block conductive foreign substances from affecting the switching portion.

The cover 950 is coupled to the lower portion of the collection container 910 so as to be openable. The cover 950 may be coupled to the collection container 910 by a rotation method or an insertion method. By opening the cover 950 by the administrator, foreign matter particles stacked on the collection container 910 can be removed.

It is not possible to completely block the generation of foreign substances during the assembly and transportation process of the gas circuit breaker 10 and the switching operation. Foreign matter particles are most often generated during the initial switching operation. The types of foreign substances are mainly wearing powder, which is a non-conductive material, silver particles of the puffer cylinder 610, which is a conductive material, and support spring powder.

In order to remove foreign substances generated during initial switching, the most foreign substances can be removed by removing the generated foreign substances by switching a preset number of times before installation on the site. After on-site installation, there is an inconvenience that foreign substances can be removed only after the contact is cut off for inspection of the gas circuit breaker 10 and all insulating gases are removed and all internal parts are separated.

However, in the case of the present invention, a blocking wall 930 may be provided to block the foreign material from being floated even if it occurs, and the cover 950 may be opened to discharge foreign material particles to the outside of the collection container 910. Therefore, since it is possible to remove and clean foreign particles without separating all the parts inside the insulating housing 100, there is an effect of shortening work time and improving workability.

The gas circuit breaker according to an embodiment of the present invention having the above-described configuration has a structure capable of collecting foreign material particles in a part where foreign matter mainly occurs and preventing injury, thereby preventing electric field distortion and insulation destruction due to foreign material injury. I can.

In addition, since the foreign material collection portion is located in a portion that can secure a sufficient insulating distance from the contact point, electric field distortion and insulation breakdown can be prevented.

On the other hand, the gas circuit breaker of the present invention may include a foreign material collection unit 900 as shown in FIG. 5 (a detailed description of the same configuration as in the above-described embodiment will be omitted).

5 is a perspective view showing a foreign material collection unit according to another embodiment of the present invention.

As shown in FIG. 5, in the foreign matter collecting unit 900 according to another exemplary embodiment of the present invention, the blocking wall 930 on the upper part of the collecting container 910 may be formed to be inclined upward toward the hollow.

When the hollow side of the blocking wall 930 is disposed to be inclined upward, the hollow is increased, so that foreign substances may more easily fall into the collection container 910 and be stacked. Therefore, it is possible to minimize the amount of foreign matter particles stacked on the outside of the collection container 910.

The above-described present invention is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those of ordinary skill in the technical field to which the present invention belongs. Is not limited by

10: gas circuit breaker 100: insulated housing
200: fixed part 300: fixed part support
400: movable part 500: movable part support
510: wear ring 530: support spring
600: cylinder part 610: puffer cylinder
700: movable rod 800: insulation box
810: insulation shield 830: through hole
900: foreign matter collection unit 910: collection container
930: barrier wall 950: cover

Claims (7)

An insulating housing filled with insulating gas;
A fixing part fixed inside the insulating housing and having a contact point;
A movable part installed inside the insulating housing and provided with a contact point that contacts or separates from the contact point of the fixed part, and a nozzle for injecting an extinguishing gas when separated from the contact point of the fixed part;
An insulating tube installed at a contact portion between the contact points of the fixed portion and the movable portion, enclosing the contact portion between the contacts, and having a through hole through which the extinguishing gas is discharged; And
A foreign material collection unit formed on the insulating housing, provided under the insulating tube, and stacking foreign material particles discharged through the through hole;
Including
Gas circuit breaker in gas insulated switchgear.
The method of claim 1,
The insulating housing has a longitudinal direction horizontally disposed on the installation surface.
Gas circuit breaker in gas insulated switchgear.
The method of claim 2,
The foreign matter collection unit
A collection container integrally formed with the insulating housing and protruding to the outside of the insulating housing to form an accommodation space; And
A barrier wall provided on the upper part of the collection container and having a hollow through which the foreign material particles fall, and blocking a part of the collection container from an upper side;
Containing
Gas circuit breaker in gas insulated switchgear.
The method of claim 3,
The insulating container
The through hole faces the lower side of the insulating housing,
The barrier is
The hollow is formed to correspond to the position of the through hole of the insulating tube
Gas circuit breaker in gas insulated switchgear.
The method of claim 4,
The barrier is
The size of the hollow has a size corresponding to the size of the through hole
Gas circuit breaker in gas insulated switchgear.
The method of claim 3,
The foreign material blocking part
Further comprising a cover coupled to be opened and closed at the bottom of the collection container
Gas circuit breaker in gas insulated switchgear.
The method of claim 3,
The barrier is
Characterized in that the insulating material
Gas circuit breaker in gas insulated switchgear.

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