KR20100074912A - Gas insulated switchgear - Google Patents

Abstract

PURPOSE: A gas insulated switchgear is provided to improve the durability of the insulation spacer by optimizing the position of a metal shield. CONSTITUTION: A sealed container(110) comprises one or more inlet hole(112) projected to the outside direction. At least one assembly(120) is used to seal the inlet hole. A metal shield(130) of spherical shape is electrically connected to the assembly. An inner conductor(140) is arranged along the length direction in the middle part of the sealed container. An insulation spacer(150) is expanded to the inner conductor in order to support the inner conductor from the assembly.

Description

Gas Insulated Switchgear {GAS INSULATED SWITCHGEAR}

The present invention relates to a gas insulated switchgear.

In general, a gas insulated switch charger (GIS) uses a gas for insulation, which has excellent insulation performance and arc extinguishing function, in a metal hermetically sealed container as an insulating medium, thereby storing the conductor and various protective devices therein to improve reliability. It is a substation facility, and is composed of various components such as breaker, disconnector, and ground switch.

The gas insulated switchgear includes an insulating spacer positioned in the hermetically sealed container, wherein the insulating spacer supports a conductor through which a high voltage current flows so as not to contact the inner wall of the hermetically sealed container so as to be insulated from each other and around the conductor. Serves to mitigate the electric field.

The insulating spacer is generally divided into a metal ring flange type and a buried insert insertion type according to the material of the flange assembly. Among them, a metal shield is located in the insulating spacer of the buried bracket insertion type, and the metal shield is connected to the buried bracket by a shield conductor. This structure can mitigate the electric field on the insulating spacer.

However, the position of the metal shield is different according to the insulating spacer, and the place where the electric field is concentrated according to the position of the metal shield may be distributed differently. In this case, the performance of the insulating spacer may be degraded in a portion where some electric field is high. Degradation of the insulation spacer may cause frequent failure of the gas insulation switchgear.

The present invention provides a gas insulated switchgear which can reduce the electric field applied around the insulating spacer through the optimization of the position of the metal shield.

Further objects to be solved by the present invention are not limited to the above-mentioned objects, and other objects not mentioned will be clearly understood by those skilled in the art from the following description. Could be.

Gas insulated switchgear according to an embodiment of the present invention is a sealed container formed with at least one insertion hole protruding in the outward direction; At least one embedded bracket for sealing the insertion opening; A spherical metal shield electrically connected to the embedded bracket; A center conductor disposed along a longitudinal direction in the central portion of the sealed container; And an insulating spacer extending from the at least one embedment bracket to the center conductor to support the center conductor, wherein the metal shield has an outer circumferential surface of the metal shield on the same line as the inner surface of the sealed container. It is arranged to be located.

Here, the metal shield may be electrically connected to the embedded bracket by a metal connecting member. In this case, the metal connecting member may be connected to the central portion of the embedded bracket in a direction perpendicular to the embedded bracket.

The insulating spacer may include a spacer center portion through which the center conductor passes; A spacer curved portion extending outwardly from the spacer center portion; And a spacer end bent outwardly from the spacer curved portion and inserted into the insertion hole. Such an insulating spacer may be an epoxy resin molded body.

Here, the closed container may be formed in a tubular shape. In this case, at least two insertion holes facing each other may be formed in the sealed container.

Specific details of other embodiments are included in the detailed description and the drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings.

According to the present invention, by optimizing the position of the metal shield, it is possible to reduce the electric field applied to the area around the insulating spacer, for example, a sealed container, an insulating spacer, and a portion where the gas filled in the sealed container meets each other. Through this, the durability of the insulating spacer can be improved, and the reliability of the gas insulated switchgear can be ensured.

Hereinafter, a gas insulated switchgear according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals refer to like elements throughout.

1 is a view for schematically explaining a configuration of a gas insulated switchgear according to an embodiment of the present invention. 2 is a view for explaining in more detail the position of the metal shield in the gas insulated switchgear shown in FIG.

1 and 2, a gas insulated switchgear 100 according to an embodiment of the present invention includes a sealed container 110, a buried bracket 120, a metal shield 130, a center conductor 140, and insulation. A spacer 150.

The hermetically sealed container 110 is a body forming the exterior of the gas insulated switchgear 100, and is provided in the shape of a tube such that an inner space thereof is sealed. The airtight container 110 is made of a metal material having excellent durability and mechanical strength, each divided into at least two or more parts, and the divided parts are provided to be coupled to each other. Here, the present invention is not limited by the manner in which the respective portions of the sealed container 110 are combined.

The inner space of the sealed container 110 may be filled with an insulating gas, for example, sulfur hexafluoride (SF ₆ ) gas, which has excellent insulation performance and anti-fogging function, but the present invention is not limited to the gas type. .

The airtight container 110 has at least one insertion hole 112 protruding outward. The number and the formation positions of the insertion holes 112 are not particularly limited, but, for example, at least two insertion holes 112 may be formed to face each other in consideration of installation positions of the insulating spacers 150 and the like.

The embedded bracket 120 may seal the insertion hole 112 so that the gas filled in the sealed container 110 through the insertion hole 112 may not leak. The embedded bracket 120 may be provided to contact the sealed container 110.

The metal shield 130 may be located at an inner central portion of the insulating spacer 150. Specifically, as illustrated in FIG. 2, the metal shield 130 has an outer circumferential surface in the insertion hole 112 direction of the metal shield 130 on the same line 114 as the inner surface of the sealed container 110. It may be arranged to. That is, a portion of the outer circumferential surface of the metal shield 130 that is close to the insertion hole 112 is formed on the inner surface of the sealed container 110 in which the insertion hole 112 is not installed among the inner surfaces of the sealed container 110. It can be located on the extension surface. In addition, the center of the metal shield 130 may be located on the vertical axis 122 of the embedded bracket (120).

The metal shield 130 may be electrically connected to the embedded bracket 120 by the metal connecting member 132. The metal connecting member 132 is, for example, in a direction perpendicular to the buried bracket 120 such that the center of the metal shield 130 may be located on the vertical axis 122 of the buried bracket 120. It may be connected to the central portion of the embedded bracket (120). In such a structure, the electric field applied to the insulating spacer 150 may be discharged along the metal shield 130, the metal connecting member 132, the embedding bracket 120, and the sealed container 110. Meanwhile, the metal connecting member 132 may be directly connected to the sealed container 110 in consideration of the shape and installation position of the insulating spacer 150.

The metal shield 130 may be formed, for example, in a spherical shape, but is not limited thereto, and various shape modifications may be made. For example, the metal shield 130 may be formed in an ellipsoidal shape, a rod shape, a pyramidal shape, or the like, and thus the present invention is not limited to the shape of the metal shield 130.

The central conductor 140 may be installed along the longitudinal direction of the sealed container 110 at the center of the inner space of the sealed container 110. The center conductor 140 may be formed of a metal material having excellent conductivity, whereby a high voltage current may flow through the center conductor 140.

The insulating spacer 150 extends from the at least one buried bracket 120 to the center conductor 140 so as to support the center conductor 140 so that the center conductor 140 does not contact the airtight container 110. It may be extended.

The insulating spacer 150 may be formed in a conical shape or a disk shape, but in an exemplary embodiment of the present invention, the insulating spacer 150 may be formed in a conical shape. For example, the insulating spacer 150 may include a spacer center portion 152 through which the center conductor 140 penetrates, a spacer curved portion 154 extending outwardly from the spacer central portion 152, and the spacer curved portion 154. It may be bent to the outside, and may include a spacer end 156 inserted into the insertion hole (112). Here, the through hole 158 through which the center conductor 140 penetrates is formed in the spacer center portion 152, and the spacer end 156 is inserted into the insertion hole 112, so that the embedment bracket and // Or it may be in contact with the hermetic container 110.

The insulating spacer 150 may be provided in the form of a molded body formed using an epoxy resin, but the present invention is not limited thereto. That is, since the insulating spacer 150 may be formed of a material having excellent insulation and durability, the present invention is not limited to the material of the insulating spacer 150.

Table 1 shows the results of the electric field analysis according to the metal shield position in the gas insulated switchgear according to an embodiment of the present invention and the gas insulated switchgear according to the comparative example. In the gas insulated switchgear according to the comparative example, the metal shield is positioned with the outer circumferential surface of the metal shield spaced from the same line as the inner surface of the sealed container.

First part Second part Third site Comparative example 100 100 100 Example 73 61 73

In Table 1, as shown in FIG. 2, the first and second portions 160 and 162 respectively include a gas filled in the airtight container 110, the insulating spacer 150, and the airtight container 110. The third part 164 refers to an inner space where the gas and the insulating spacer 150 meet each other. In addition, the numerical value of each site | part in the Example of Table 1 shows the relative value according to the electric field analysis result which converted into 100 for each site | part in accordance with a comparative example.

Referring to Table 1, the gas insulation opening and closing device 100 according to an embodiment of the present invention is the first and second portions 160 and 162, which are the portions which have the greatest influence on the insulation performance of the insulation spacer 150. It can be seen that the electric field concentration is relaxed than the comparative example, and it can be also confirmed that the electric field concentration is relaxed in the third portion 164 than the comparative example.

As such, the outer circumferential surface of the metal shield 130 in the direction of the insertion hole 112 is positioned on the same line 114 as the inner surface of the hermetically sealed container 110, and the center of the metal shield 130 is the embedding bracket ( When positioned on the vertical axis 122 of the 120, it is possible to prevent the dielectric breakdown phenomenon of the insulating spacer 150. Through this, durability of the insulation spacer 150 may be improved, and reliability of the gas insulation switchgear 100 may be ensured. In addition, since the size of the metal shield 130 can be reduced, it is possible to reduce the cost of parts and to facilitate manufacturing in the production process.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains can realize that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. I can understand that.

Therefore, it should be understood that the above-described embodiments are provided so that those skilled in the art can fully understand the scope of the present invention. Therefore, it should be understood that the embodiments are to be considered in all respects as illustrative and not restrictive, The invention is only defined by the scope of the claims.

1 is a view for schematically explaining a configuration of a gas insulated switchgear according to an embodiment of the present invention.

2 is a view for explaining in more detail the position of the metal shield in the gas insulated switchgear shown in FIG.

{Description of symbols for main parts of the drawing}

100: gas insulated switchgear 110: airtight container

112: insertion hole 120: purchase bracket

130: metal shield 132: metal connecting member

140: center conductor 150: insulation spacer

Claims (7)

A hermetically sealed container having at least one insertion hole protruding in an outward direction; At least one embedded bracket for sealing the insertion opening; A spherical metal shield electrically connected to the embedded bracket; A center conductor disposed along a longitudinal direction in the central portion of the sealed container; And An insulating spacer extending from said at least one embedded bracket to said center conductor for supporting said center conductor Including; And the metal shield is arranged such that an outer circumferential surface of the metal shield in the insertion opening direction is positioned on the same line as the inner surface of the sealed container. The method of claim 1, And the metal shield is electrically connected to the buried bracket by a metal connecting member. The method of claim 2, And the metal connecting member is connected to a central portion of the embedded bracket in a direction perpendicular to the embedded bracket. The method of claim 1, wherein the insulating spacer, A spacer center portion through which the center conductor passes; A spacer curved portion extending outwardly from the spacer center portion; And An end portion of the spacer which is bent outward from the spacer curved portion and inserted into the insertion hole Gas insulated switchgear comprising a. The method of claim 1, The gas insulated switchgear which the said insulating spacer is an epoxy resin molded object. The method of claim 1, The closed container is a gas insulated switchgear, characterized in that the tubular shape. The method of claim 6, And the at least two insertion openings facing each other are formed in the sealed container.

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