KR20150113723A - Insulating spacer and gas-insulated electrical device having the same - Google Patents

Abstract

The present invention relates to an insulating spacer capable of obtaining sufficient performance of insulation even in a small size by effectively mitigating an electric field, and to a gas-insulated electrical device including the same. The insulating spacer according to the present invention is an insulating spacer interposed between an electrical conductor and a metallic tank so that the electrical conductor can be placed while being separated from the metallic tank, which envelops the outer side of the electrical conductor. The insulating spacer comprises: a central conductor electrically connected to the electrical conductor; an outer shielding member which is a conductor and is configured to be electrically connected to the metallic tank; and an insulating member composed of an insulating material, enveloping the outer shielding member so that the outer shielding member cannot be exposed to a space between the electrical conductor and the metallic tank, and configured to fixate the central conductor to the metallic tank. The outer shielding member has a curved surface part which is convex toward the central axis of the insulating spacer. According to the insulating spacer of the present invention, the size of a gas-insulated electrical device can be made smaller by mitigating an electric field at a joining point, thereby improving the performance of insulation. Accordingly, costs for manufacturing a gas-insulated electrical device can be reduced.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an insulated spacer,

The present invention relates to an insulating spacer and a gas-insulated electrical apparatus having the same, and more particularly, to an insulating spacer having a simple shape and easy fabrication, capable of effectively attenuating an electric field, To a gas-insulated electrical device.

The gas-insulated electrical apparatus is generally referred to as an apparatus for performing insulation using an insulating gas such as SF ₆ gas and includes, for example, a gas insulated switchgear.

In such a gas-insulated electrical apparatus, an insulating spacer is disposed between flanges functioning as a connecting portion of a cylindrical metal container to be grounded, and is fixed so as to be hermetically sealed. Insulating gas is sealed in each metal container at a high pressure of about 0.4 to 0.6 MPa do.

For example, the gas insulated switchgear is composed of each device such as a breaker, a disconnecting switch, a grounding switch, and a bus bar which are housed in a metal container, and these devices are operated at appropriate intervals In order to partition the insulating gas, the gas compartment is sealed with an insulating spacer.

Normally, the insulating spacer satisfies the insulation performance and also requires a mechanical strength for sealing the insulating gas of high pressure. Therefore, an epoxy material filled with alumina or an epoxy resin material filled with silica is mainly used.

Figure 1 is a schematic partial cross-sectional view of a typical insulating spacer.

1, a general insulating spacer 10 comprises a central conductor 11 electrically connected to conducting conductors 1 and 2 and a central conductor 11 fixed to the grounded metal tank 3 And an insulating member 12 formed of an insulator, and has the shape of a cone as a whole in order to increase the insulation distance.

The conventional insulating spacer 10 is interposed between and fixed to the flange 4 of the metal tank 3, thereby being mounted on the gas-insulated electrical apparatus. 1, the space between the conductive conductors 1, 2 and the metal tank 3 is partitioned, and the insulating gas is sealed at high pressure in these spaces.

At the junction J where the insulating member 12, the metal tank 3, and the insulating gas meet, the electric field is distorted and concentrated due to the difference in conductivity between the different members, and functions as an insulation breakdown point. Therefore, there has been an attempt to alleviate the phenomenon that the electric field is concentrated and distorted around the junction J, thereby alleviating the electric field around the junction J and further improving the insulation performance.

1, a spring-shaped shield ring 14, which is electrically connected to the metal tank 3 through the earth tumbler 13 and embedded in the insulating member 12, is used Registration utility model 20-0288898).

However, although the electric field relaxation effect can be obtained to some extent near the junction J by such a shield ring 14, since the electric field relaxation effect is not sufficient, a spacer is formed in a cone shape as shown in Fig. I had to do it.

Therefore, if the effect of reducing the electric field is further increased, the insulation distance can be reduced. As a result, the size of the insulation spacer can be reduced, and a shield structure with an effect of further reducing the electric field is required for downsizing and cost reduction.

(Patent Document 1)

Korean Registered Utility Model 20-0288898 (September 11, 2002)

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned technical needs, and it is an object of the present invention to provide a method of manufacturing a semiconductor device which can reduce the electric field at a junction, Insulating spacers and a gas-insulated electrical apparatus having the same.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

The insulating spacer of the present invention for solving the above problems is an insulating spacer interposed between the conductive conductor and the metal tank so that the conductive conductor is spaced apart from a metal tank surrounding the conductive metal. Wherein the insulating spacer comprises: a center conductor electrically connected to the conducting conductor; An insulating member made of an insulating material and disposed between the center conductor and the metal tank so as to fix the center conductor to the metal tank; And an outer shield member which is a conductor and which is at least partially covered by the insulating member and electrically connected to the metal tank and has a convex curved surface portion toward a center axis of the insulating spacer, and at least a part of the conductor member is wrapped by the insulating member, And an inner shield member electrically connected to the central conductor and having a convex curved surface portion toward the outside of the insulating spacer.

According to another aspect of the present invention, the curved surface portion of the outer shield member is located closer to the center conductor side than a point where the metal tank and the insulating member meet. The curved surface portion of the inner shield member is located closer to the metal tank side than the point where the center conductor and the insulating member meet.

According to still another aspect of the present invention, at least one of the outer shield member and the inner shield member is formed in the form of a thin plate or mesh having a plurality of holes.

According to still another aspect of the present invention, at least one of the curved portions of the outer shield member and the inner shield member is composed of the separated curved portions.

According to still another aspect of the present invention, at least one curved portion of the outer shield member and the inner shield member is integrally formed without a separate portion.

According to still another aspect of the present invention, an outer circumferential surface of the insulating member is formed such that a point where the metal tank and the insulating member meet is located outside the inner circumferential surface of the metal tank.

According to still another aspect of the present invention, the insulating spacer is a disc-shaped insulating spacer.

According to still another aspect of the present invention, the insulating spacer is a cone-shaped insulating spacer.

According to still another aspect of the present invention, the insulating spacer is applicable to a case where there are two or more central conductors.

Means for Solving the Problems The gas insulated electrical apparatus of the present invention for solving the above problems is characterized by including the above-described insulating spacer.

According to the insulating spacer of the present invention, the electric field at the junction between the metal tank and the spacer is relaxed, thereby improving the insulation performance, making it possible to miniaturize the size of the gas-insulated electrical device, and to easily manufacture it with a simple shape. Thus, the production cost of the gas-insulated electrical apparatus can be reduced.

Figure 1 is a schematic partial cross-sectional view of a typical insulating spacer.
2 is a schematic partial cross-sectional view of an insulating spacer according to an embodiment of the present invention.
3A and 3B are electric field distribution simulation data assuming that there is no inner shield member and no outer shield member.
4A and 4B are electric field distribution simulation data when the outer shield member is provided.
5A and 5B are electric field distribution simulation data in the case where both the inner shield member and the outer shield member are provided.
6 is a schematic partial cross-sectional view of an insulating spacer according to another embodiment of the present invention.
7A and 7B are electric field distribution simulation data in the case where both the inner shield member and the outer shield member are provided.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

Although the first, second, etc. are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical scope of the present invention.

In the present specification, when the same reference numerals are used to denote the same elements even when different reference numerals are used, the same reference numerals are used as much as possible.

The sizes and thicknesses of the individual components shown in the figures are shown for convenience of explanation and the present invention is not necessarily limited to the size and thickness of the components shown.

Hereinafter, embodiments of the insulating spacer of the present invention will be described with reference to the accompanying drawings.

FIG. 2 is a schematic partial sectional view of an insulation spacer according to an embodiment of the present invention, FIGS. 3A and 3B are electric field distribution simulation data assuming that there is no inner shield member and no outer shield member, FIGS. 4A and 4B 5A and 5B are electric field distribution simulation data in the case where both the inner shield member and the outer shield member are provided.

2, an insulating spacer 100 according to an embodiment of the present invention includes a center conductor 110, an insulating member 120, an outer shield member 130, and an inner shield member 140 .

The term " inner side " used herein means a side where the conductive conductors 1 and 2 are located, and the term " outer side " means a side where the metal tank 3 is located do.

The center conductor 110 is electrically connected to the conductive conductors 1 and 2 and serves to fix the conductive conductors 1,2. The conductive conductors 1 and 2 may be fixedly connected to each other via the center conductor 110 in a separated state or may be integrally formed and inserted into and fixed to the center conductor 110, ). The connection form of the center conductor 110 and the conductive conductors 1 and 2 may be variously modified.

The insulating member 120 is formed such that the outer shield member 130 and the inner shield member 140 to be described later in this embodiment are not exposed in the space between the conductive conductors 1 and 2 and the metal tank 3 So as not to be exposed to the insulating gas), the outer shield member 130 and the inner shield member 140. However, it is not necessary that the insulating member 120 surrounds all of the outer shield member 130 and the inner shield member 140 as in the present embodiment, and the outer shield member 130 and the inner shield member 140, As shown in FIG. That is, the outer shield member 130 or the inner shield member 140 may be partially exposed to the insulating member 120.

The insulating member 120 may be formed of an insulating material such as epoxy or the like and may be made of an insulating material containing alumina or silica to withstand a high-pressure insulating gas filled therein.

The insulation member 120 maintains the distance between the conductive conductors 1 and 2 and the metal tank 3 such that the conductive conductors 1 and 2 are spaced apart from the metal tank 3 surrounding the conductive conductors 1 and 2 It plays a role. That is, the center conductor 110 is also fixed to the metal tank 3.

The outer shield member 130 is composed of a conductor and is configured to be electrically connected to the grounded metal tank 3. In this embodiment, the outer shield member 130 is electrically connected to the metal tank 3 by the grounding frame 139.

The outer shield member 130 has a convex curved surface portion 131 directed inward (that is, toward the center axis C of the insulating spacer 100). In the present embodiment, the curved surface portion 131 is divided into a plurality of central portions.

It is preferable that the curved surface portion 131 has a continuous curved surface without a sharp point and the curved surface portion 131 of the curved surface portion 131 is located inside (i.e., the center conductor 110 ) Side) of the main body. As a result, the electric field near the junction point J can be relaxed.

The operation of the outer shield member 130 having the above-described curved surface portion 131 will be described with reference to Figs. 3A, 3B, 4A and 4B. For reference, the simulation data of FIGS. 3A to 4B were obtained assuming that a voltage of 1425 V was applied to the center conductor 110. FIG.

Referring to FIGS. 3A and 3B, when the outer shield member 130 is not applied, the electric field is distorted near the junction J, so that a much higher electric potential than that around the junction J is formed as the electric field is concentrated. Therefore, there is a high possibility that insulation breakdown occurs near the junction point J.

4A and 4B, it can be seen that the electric field is relaxed near the junction J due to the outer shield member 130, and the potential at the junction J is lowered. That is, the possibility of dielectric breakdown at the junction J is significantly lowered.

This electric field relaxation is caused by the shape of the outer shield member 130, particularly, the curved surface portion 131. The curved surface portion 131 raises the equipotential line from the junction J to the inside, thereby alleviating the electric field at the junction J. Accordingly, in order to maximize the electric field relaxation effect, it is preferable to position the curved surface portion 131 closer to the inside than the junction point J.

2, it is preferable that the curved surface portion 131 of the outer shield member 130 extends to the vicinity of the junction point J for effective field relaxation. That is, it is preferable that the curved surface portion 131 occupies most of the width of the insulating member 120, for example, 90%, 95%, or more. The upper limit of the range in which the curved surface portion 131 occupies the width of the insulating member 120 is that the outer shield member 130 is covered with the insulating member 120 and the insulating member 120 located outside the outer shield member 130, Can be determined by design criteria or design criteria that can be attached with sufficient mechanical strength. That is, it is preferable that the insulating member 120 surrounds the outer shield member 130 and extends the curved surface portion 131 to the maximum extent only to maintain the minimum strength.

The outer surface of the portion of the outer shield member 130 excluding the curved surface portion 131 may be formed to follow the outer circumferential surface of the insulating member 120 as shown in FIG. This provides an improved mechanical strength of the end of the insulating member 120 and also allows the curved surface 131 of the outer shield member 130 to be maximally expanded.

It is preferable that the junction point J is far from the center conductor 110 or the curved surface portion 131 so that the junction point J is located outside the inner circumferential surface of the metal tank 3 120 are formed.

On the other hand, if the curved surface portion 131 has a sharp point, the electric field is concentrated on the portion, so that the possibility of dielectric breakdown increases. Therefore, it is preferable that the curved surface portion 131 has a convex shape as a whole.

With this outer shield member 130, the possibility of dielectric breakdown can be reduced as described above. The outer shield member 130 may be used as the inner shield member 140 to be described later. However, even if the inner shield member 140 is not used, the effect of alleviating the electric field at the junction point J can be obtained. have.

The inner shield member 140 is a conductor that is electrically connected to the center conductor 110 and is surrounded by the insulating member 120 so as not to be exposed to the space between the conductive conductors 1 and 2 and the metal tank 3 .

The inner shield member 140 also has a curved surface portion 141 which is convex toward the outer side of the insulating spacer 100 (i.e., on the side of the metal tank 3) like the outer shield member 130. In the present embodiment, the curved surface portion 141 is divided into a plurality of central portions.

It is preferable that the curved surface portion 141 has a continuous curved surface without any point, because the electric field concentration at the sharp point is avoided.

The action of the inner shield member 140 having the curved surface portion 141 described above will be described with reference to Figs. 3A, 3B, 5A and 5B.

5A and 5B, the curved surface portion 141 of the inner shield member 140 can relieve the electric field in the vicinity of the junction J, and the point where the electric field is concentrated is the inner side of the insulating member 120 . Even if the electric field is concentrated inside the insulating member 120, the possibility of dielectric breakdown may be lowered if the electric field near the junction J is relaxed.

Therefore, the possibility of dielectric breakdown in the vicinity of the center conductor 110 can be lowered by the inner shield member 140.

The outer shield member 130 and the inner shield member 140 may be used alone or in combination. Of course, the insulation performance is best when used together.

The outer shield member 130 and the inner shield member 140 may have the shape of an outer surface as shown in FIG. 2, for example, the inner shield member 140 may be filled with a conductor. However, since the conductor forming the outer shield member 130 and the inner shield member 140 and the insulating member 120, which is an insulator, have different thermal expansion ratios, they are not bonded to each other when they are bonded together as a wide surface. Therefore, it is preferable that the outer shield member 130 and the inner shield member 140 are formed in a plate shape as shown in FIG. 2, and the inner and outer sides thereof are all surrounded by the insulating member 120.

It is preferable that a plurality of holes are formed in the outer shield member 130 and the outer shield member 140 so that the insulating member 120 is filled with the holes. More preferably, the outer shield member 130 and the outer shield member 140 are formed in a mesh shape. When the outer shield member 130 and the outer shield member 140 are formed as described above, it is possible to enhance the bonding performance with the insulating member 120 and to further increase the mechanical strength. As a result, Can withstand the destruction caused by.

The insulating spacer 100 of the present embodiment is interposed between the flanges 4 of the metal tank 3 and can be fixed by inserting bolts through the grounding tier 139 and then assembling the nuts. At this time, an O-ring 5 made of a rubber material may be interposed between the insulating spacer 100 and the flange 4 in order to prevent leakage of insulated gas injected into the metal tank 3.

Here, the grounding frame 139 can be inserted into the insulating spacer 100 in the form of an insert, and a tab or hole is formed on the inner circumferential surface thereof. The grounding frame 139 is electrically connected to the metal tank 3 and also serves to connect electrically adjacent metal tanks.

FIG. 6 is a schematic partial cross-sectional view of an insulation spacer according to another embodiment of the present invention, and FIGS. 7A and 7B are electric field distribution simulation data in the case of including both an inner shield member and an outer shield member.

6, the insulating spacer 200 of the present embodiment includes a center conductor 210, an insulating member 220, an outer shield member 230, and an inner shield member 240.

The center conductor 210 and the insulating member 220 are the same as those of the center conductor 110 and the insulating member 120 of the insulating spacer 100 shown in FIG. Only the shapes of the curved surfaces 231 and 241 of the outer shielding member 230 and the inner shielding member 240 are different from those of the embodiment of FIG.

The outer shielding member 230 and the inner shielding member 240 of the present embodiment are different from the outer shielding member 130 and the inner shielding member 140 of Figure 2 in that the curved portions 231 and 241 ).

7A and 7B, it is possible to alleviate the electric field in the vicinity of the junction J even when the curved surface portions 231 and 241 are provided, thereby improving the insulation performance.

The insulating spacers 100 and 200 described above can be manufactured as a disk type instead of a cone type as shown in FIGS. 2 and 6 as the insulating performance is improved. Accordingly, the amount of the insulating member used can be reduced to reduce the production cost, and the volume occupied by the insulating spacer can be reduced, thereby reducing the volume of the gas-insulated electrical apparatus in which the insulating spacer 100, 200 of the present invention is mounted have.

However, this does not mean that the insulating spacers 100 and 200 can not be manufactured in a cone shape. The shapes of the insulating members 120 and 220 may be formed in a cone shape, unlike the above embodiments.

In the above-described embodiments, the number of the central conductors 110 and 210 is described as an example. However, the number of the central conductors may be two or more. That is, three central conductors may be provided to accommodate the three-phase conducting conductors, and more than three central conductors may be provided.

The above-described insulating spacers 100 and 200 may be used in, for example, a gas insulated switchgear (GIS), but the present invention is not limited thereto and can be widely applied to various electric apparatuses that take a gas-insulated manner.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

1, 2 ... Conducting conductor
3 ... Metal tank
4… flange
5 ... O-ring
110, 210 ... Center conductor
120, 220 ... Insulating member
130, 230 ... The outer shield member
131, 231 ... The curved portion of the outer shield member
139, 239 ... Grounding tee
140, 141 ... The inner shield member
100, 200 ... The insulating spacer

Claims (10)

An insulating spacer interposed between the conductive conductor and the metal tank so that the conductive conductor is spaced apart from a metal tank surrounding the conductive conductor,
A center conductor electrically connected to the conductive conductor;
An insulating member made of an insulating material and disposed between the center conductor and the metal tank so as to fix the center conductor to the metal tank; And
An outer shield member which is a conductor and which is at least partially covered by the insulating member and electrically connected to the metal tank and has a convex curved surface portion facing the central axis of the insulating spacer, and a conductor, which is at least partially wrapped by the insulating member, And an inner shield member electrically connected to the conductor and having a convex curved portion toward the outside of the insulating spacer. The method according to claim 1,
The curved surface portion of the outer shield member is located closer to the center conductor side than the point where the metal tank and the insulating member meet,
Wherein the curved surface portion of the inner shield member is positioned closer to the metal tank side than a point where the center conductor and the insulating member meet. The method according to claim 1,
Wherein at least one of the inner shield member and the outer shield member is in the form of a thin plate or mesh having a plurality of holes. The method according to claim 1,
Characterized in that at least one curved portion of the outer shield member and the inner shield member is composed of discrete curved portions. The method according to claim 1,
Characterized in that at least one curved portion of the outer shield member and the inner shield member is integrally formed without a separate portion. The method according to claim 1,
And an outer circumferential surface of the insulating member is formed such that a point where the metal tank and the insulating member meet is positioned outside the inner circumferential surface of the metal tank. The method according to claim 1,
Wherein the insulating spacer is a disc-shaped insulating spacer. The method according to claim 1,
Wherein the insulating spacer is a cone-shaped insulating spacer. The method according to claim 1,
Wherein the insulating spacer is applicable when there are two or more of the central conductors. A gas-insulated electrical apparatus comprising an insulating spacer according to any one of claims 1 to 9.

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