JP2007267506A - Gas-insulated bus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact and economical gas-insulated bus for improving the insulation reliability. <P>SOLUTION: An electrode 6 embedded on the low-voltage side in an insulating spacer 3 is fixed to an end flange 8 in a grounded metal container 1. The insulating spacer 3 is composed as a rod or a plate. The central axis C1 of the insulating spacer 3 is installed so as to be inclined at an arbitrary angle (a) between the central axis D1 of the grounded metal container 1. A high-voltage conductor 2 accommodated within the grounded metal container 1 is insulated and supported by the insulating spacer 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a gas-insulated bus that encloses an insulating gas such as SF ₆ gas as an insulating medium in a ground metal container, and insulates and supports a high-voltage conductor by an insulating spacer in the ground metal container.

  Conventionally, gas insulated buses have been used in substations and the like. The gas-insulated bus is configured by installing a high-voltage conductor for energization in a grounded metal container, insulated and supported by an insulating spacer, and encapsulating an insulating gas as an insulating medium in the grounded metal container.

FIGS. 11A and 11B show one configuration example of such a gas-insulated bus. That is, an insulating gas is sealed in the cylindrical ground metal container 1 as an insulating medium. As this insulating gas, SF ₆ gas is usually used. SF ₆ gas is characterized by high stability, inertness, incombustibility, odorlessness, harmlessness, and a dielectric strength that is two to three times that of air at the same pressure.

  In the ground metal container 1, a high-voltage conductor 2 for energization is disposed concentrically with the ground metal container 1 and is insulated and supported in the ground metal container 1 by a cylindrical insulating spacer 3. Yes. The insulating spacer 3 includes an insulator 7 made of a thermosetting synthetic resin such as an epoxy resin, and a high voltage side embedded electrode 5 and a low voltage side embedded electrode 6 are provided at both ends of the insulator 7. Are integrally cast.

  The insulating spacer 3 configured as described above is configured so that the high voltage side embedded electrode 5 is on the high voltage conductor 2 side and the low voltage side embedded electrode 6 is on the ground metal container 1 side so that the high voltage conductor 2 is grounded. It is attached between the metal container 1. In this case, the ground metal container 1 is provided with a support seat 4 for attaching the low voltage side embedded electrode 6 of the insulating spacer 3. The insulating spacer 3 is disposed so as to be orthogonal to the longitudinal direction of the high voltage conductor 2.

  By the way, with the increase in capacity of gas-insulated equipment as power demand increases, there is a strong demand for improving the insulation reliability of gas-insulated bus bars. The insulation reliability of the gas-insulated bus is determined by “insulating performance of insulating gas” and “insulating performance of insulating spacer”. Of these, the insulating performance of the insulating spacer is the creeping performance of creeping metal foreign matter that is considered to exist in the grounded metal container. That is, no matter how high the insulating performance of the insulating gas in the ground metal container is, if the creeping insulating performance of the insulating spacer is low, the insulation reliability of the gas insulating bus will be lowered.

  In order to improve the creeping insulation performance of the insulating spacer, it is effective to extend the creeping insulation distance. Here, extending the insulation distance is nothing but increasing the inner diameter of the ground metal container (that is, the inner diameter of the gas-insulated bus). However, in recent years when it is difficult to secure land for construction of substations and environmental harmony is emphasized, gas insulation buses are required to ensure high insulation reliability and to be compact. It is not preferable to do.

  In order to solve such problems, various proposals have been conventionally made. For example, in Patent Document 1, as shown in FIGS. 12A and 12B, in order to increase the creeping insulation distance L <b> 1 of the insulating spacer, the high voltage conductor 2 is arranged from a horizontal plane including the central axis of the ground metal container 1. In addition, there is shown a technique in which it is arranged eccentrically upward in the vertical direction.

Further, in Patent Document 2, as shown in FIGS. 13A and 13B, a ring-shaped insulating plate 11 is provided below the cylindrical insulating spacer 3 in order to increase the creeping insulation distance L1 of the insulating spacer. The technique which suppresses the behavior of a metal foreign material is provided.
JP-A-9-149531 Japanese Patent Laid-Open No. 9-308061

  However, in the technique described in Patent Document 1, the high voltage conductor 2 is arranged eccentrically upward in the vertical direction with respect to the horizontal plane including the central axis of the ground metal container 1, so that the inner diameter of the ground metal container is greatly reduced. Therefore, the realization of compactness was insufficient.

  Further, in the case where the ring-shaped insulating plate 11 is provided below the cylindrical insulating spacer as described in Patent Document 2, not only the number of parts is increased in order to fix the insulating plate 11, but also a compact size. If the inner diameter of the ground metal container is reduced to reduce the size, it will be difficult to fix the insulating spacer and insulating plate inside the ground metal container, and the probability of occurrence of foreign matter will increase. This is disadvantageous in terms of economy and reliability. It may become.

  Furthermore, what can be said in common to the techniques described in Patent Document 1 and Patent Document 2 are a metal lid, a packing material, a mounting bolt, and the like for mounting the low-voltage side embedded electrode 6 to the ground metal container 1. The support seat 4 composed of parts is provided, which is a bottleneck in reducing the number of parts as a gas-insulated bus.

  As described above, in order to improve the insulation reliability of the gas-insulated bus, it is important to suppress the probability that metal foreign matters are generated or remain in the ground metal container. For this purpose, it is necessary to eliminate extra processing of the ground metal container and the high voltage conductor and to reduce the number of parts to be used. And it is necessary to be able to easily confirm the work site when docking the gas-insulated buses with a very high probability of occurrence of foreign matter.

  Further, in recent years when it is difficult to secure a site for constructing a substation and importance is placed on environmental harmony, there is a demand for a gas-insulated bus that has high insulation reliability and at the same time is more compact. Thus, there is an urgent need to develop a gas-insulated bus that improves these problems.

  The present invention has been proposed in order to solve the above-described problems of the prior art, and its purpose is to improve the insulation reliability and to achieve a more compact and economical gas. It is to provide an insulated bus.

  In order to achieve the above object, the invention according to claim 1 is configured such that a high-voltage conductor for energization is insulated and supported by an insulating spacer in a ground metal container in which an insulating medium is enclosed. In the gas-insulated bus, the insulating spacer is formed in a bar shape or a plate shape, and the end portion of the insulating spacer on the ground metal container side is fixed to the end flange itself of the ground metal container.

  ADVANTAGE OF THE INVENTION According to this invention, while improving insulation reliability, the gas insulation bus bar excellent in economical efficiency which aimed at the further compactness can be provided.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments to which the present invention is applied (hereinafter referred to as embodiments) will be specifically described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the member same as the prior art example shown in FIGS. 11-13, and description is abbreviate | omitted.

(1) First Embodiment (1-1) Configuration The features of the present embodiment are a configuration in which the low-voltage side embedded electrode 6 of the insulating spacer 3 is fixed to the end flange 8 itself of the ground metal container 1, and the insulating spacer 3. Is in the shape of

  That is, as shown in FIGS. 1A and 1B, in this embodiment, the low voltage side embedded electrode 6 of the insulating spacer 3 is fixed to the end flange 8 itself of the ground metal container 1. . The insulating spacer 3 is configured in a rod shape or a plate shape, and the central axis C1 of the insulating spacer 3 is installed so as to make an arbitrary angle a with the central axis D1 of the ground metal container 1. The angle a is preferably in the range of 10 ° to 45 °. By this insulating spacer 3, the high voltage conductor 2 housed in the ground metal container 1 is insulated and supported by the ground metal container 1.

(1-2) Actions / Effects In the present embodiment having the above-described configuration, the following actions / effects are obtained.
That is, by fixing the embedded electrode 6 on the low voltage side of the insulating spacer 3 to the end flange 8 itself of the ground metal container 1, the support seat 4 for attaching the insulating spacer 3 which has been conventionally required becomes unnecessary, and its installation Therefore, the probability of occurrence of foreign matter is reduced. Furthermore, since the insulating spacer 3 can be attached in the vicinity of the opening of the ground metal container 1, the assembly workability is greatly improved, and the generation of foreign matters can be further suppressed.

  Further, the smaller the angle a formed between the central axis C1 of the insulating spacer 3 and the central axis D1 of the ground metal container 1, the longer the creeping insulation distance L1 of the insulating spacer 3 becomes. That is, the smaller the angle a, the larger the creeping insulation distance L1 from the bottom surface of the ground metal container 1 to the high voltage conductor 2 where the probability of the presence of metallic foreign matter is very high.

Therefore, when this embodiment is compared with the conventional example as shown in FIG. 11 (in which the insulating spacer 3 is arranged orthogonal to the longitudinal direction of the high voltage conductor 2), both have the same insulation reliability performance. In other words, in this case, the inner diameter of the grounded metal container 1 can be made smaller, so that the both sides can ensure the same creepage insulation distance L1. Compactness is possible.
Thus, according to the present embodiment, a gas-insulated bus bar excellent in quality and economical can be obtained.

(2) Second Embodiment (2-1) Configuration A feature of the present embodiment is that the low-voltage side embedded electrode 6 of the insulating spacer 3 is fixed to the end flange 8 itself of the ground metal container 1, and the insulating spacer 3 Is in the shape of
That is, as shown in FIGS. 2A and 2B, the insulating spacer 3 used in the gas-insulated bus according to this embodiment is configured such that the low-voltage side embedded electrode 6 of the insulating spacer 3 is connected to the end flange 8 of the ground metal container 1. It is configured to be fixed to itself.

  Further, the insulating spacer 3 of the present embodiment has at least one bending point, and is configured in a rod shape or a plate shape having the first central axis C2 and the second central axis C3 with the bending point as a base point. The insulating spacer has a first central axis C2 parallel to the central axis D1 of the ground metal container 1, and a second central axis C3 is the central axis D1 of the ground metal container 1. And an arbitrary angle a. The angle a is preferably in the range of 10 ° to 45 °. By this insulating spacer 3, the high voltage conductor 2 housed in the ground metal container 1 is insulated and supported by the ground metal container 1.

(2-2) Action / Effect In the present embodiment having the above-described configuration, the following action / effect can be obtained.
That is, by fixing the embedded electrode 6 on the low voltage side of the insulating spacer 3 to the end flange 8 itself of the ground metal container 1, the support seat 4 for attaching the insulating spacer 3 which has been conventionally required becomes unnecessary, and its installation Therefore, the probability of the occurrence of foreign matter is reduced. Furthermore, since the insulating spacer 3 is attached close to the opening of the ground metal container 1, the assembly workability is greatly improved, and the generation of foreign matters can be further suppressed.

  Further, the creeping insulation distance L1 of the insulating spacer 3 becomes longer as the angle a formed by the second central axis C3 of the insulating spacer 3 and the central axis D1 of the ground metal container 1 is smaller. That is, the smaller the angle a, the larger the creeping insulation distance L1 from the bottom surface of the ground metal container 1 to the high voltage conductor 2 where the probability of the presence of metallic foreign matter is very high.

Therefore, when this embodiment is compared with the conventional example as shown in FIG. 11, when both have a structure having equivalent insulation reliability performance, that is, both can ensure the same creeping insulation distance L1. In this case, the inner diameter of the ground metal container 1 can be made shorter in this embodiment, and the gas insulated bus can be made compact.
Thus, according to the present embodiment, a gas-insulated bus bar excellent in quality and economical can be obtained.

(3) Third Embodiment (3-1) Configuration The feature of this embodiment is the arrangement of the end surface 9 of the ground metal container 1 and the end surface 10 of the high-voltage conductor 2.
That is, as shown in FIGS. 3A and 3B, in the present embodiment, the end surface 9 of the ground metal container 1 and the end surface 10 of the high-voltage conductor 2 are configured in the same position in the vertical direction. Has been.

(3-2) Actions / Effects In the present embodiment having the above-described configuration, the following actions / effects are obtained. That is, the probability of occurrence of metallic foreign matter in the grounded metal container 1 is very high when the gas-insulated buses are docked with each other compared to other cases. Therefore, by making it possible to confirm the state of the end surface 10 of the high-voltage conductor 2 from the end surface 9 of the ground metal container 1, the probability of occurrence of metal foreign matter can be suppressed. Thereby, insulation reliability can be improved.

(4) Fourth Embodiment (4-1) Configuration The feature of this embodiment is the application of an adhesive material to the inner surface of the ground metal container 1.
That is, as shown in FIGS. 4A and 4B, in the present embodiment, a predetermined adhesive is applied to the range of the inner surface S1 of the ground metal container 1 on the vertical lower projection surface of the insulating spacer 3. ing.

(4-2) Actions / Effects In the present embodiment having the above-described configuration, the following actions / effects can be obtained. That is, in this embodiment, since the adhesive material is applied to the range of the inner surface S1 of the ground metal container 1 on the vertical lower projection surface of the insulating spacer 3, the probability of being present in the ground metal container 1 is very high. Among the minute metal foreign objects, in particular, the minute metal foreign objects existing in the vicinity of the insulating spacer 3 can be easily captured. As a result, the insulating spacer 3 used in the gas-insulated bus according to the present embodiment is less susceptible to the influence of metallic foreign substances that are behaving with an electrostatic force due to voltage, so that the insulation reliability can be greatly improved.

(5) Fifth Embodiment (5-1) Configuration A feature of the present embodiment is an attachment position of the insulating spacer 3.
That is, as shown in FIGS. 5A and 5B, in the present embodiment, the insulating spacer 3 is arranged vertically above the horizontal plane including the central axis of the high-voltage conductor 2.

(5-2) Action / Effect In the present embodiment having the above-described configuration, the following action / effect can be obtained. That is, in this embodiment, the insulating spacer 3 is arranged above the horizontal plane including the central axis of the high-voltage conductor 2, and as a result, the insulating spacer 3 starts from the bottom surface of the grounded metal container 1 with a high probability of the presence of metallic foreign matter. The distance L2 up to 3 becomes longer. As a result, in this embodiment, since the insulating spacer 3 is less susceptible to the influence of metal foreign matter than the case where the insulating spacer 3 is disposed vertically below the horizontal plane including the central axis of the high-voltage conductor 2, the insulation reliability is improved. Can be improved.

(6) Other Embodiments The present invention is not limited to the above-described embodiments, and the following modifications can be considered. That is, in each of the above embodiments, the case where the number of insulating spacers is one has been described. However, as shown in FIGS. 6A and 6B, the present invention is similarly applied to a case where there are a plurality of insulating spacers. Needless to say, the following effects can be obtained.

  Further, as shown in FIGS. 7A, 7B, and 8A, 8B, an allowable load applied to the high-voltage conductor 2 by providing the insulating spacer 3 at the connecting portions at both ends of the ground metal container 1. In addition, it is possible to easily extend the support interval Z of the high-voltage conductor 2 in the axial direction of the ground metal container 1.

  In the above embodiments, the center axis of the ground metal container 1 and the center axis of the high-voltage conductor 2 are matched. However, as shown in FIGS. It goes without saying that the same effect can be obtained even if the above is applied when the center axis of the ground metal container 1 and the center axis of the high voltage conductor 2 are shifted in the vertical direction.

  In addition, although all the above embodiments have been described for the case where they are used for a single phase, as shown in FIGS. 10A and 10B, the same effects can be obtained even when the present invention is applied to a three-phase bus. Needless to say.

It is a figure which shows the structure of 1st Embodiment of the gas insulated bus which concerns on this invention, Comprising: (A) is sectional side view, (B) is the side view seen from the arrow A direction of FIG. 1 (A). It is a figure which shows the structure of 2nd Embodiment of the gas insulated bus based on this invention, Comprising: (A) is a sectional side view, (B) is the side view seen from the arrow A direction of FIG. 2 (A). It is a figure which shows the structure of 3rd Embodiment of the gas insulated bus which concerns on this invention, Comprising: (A) is a sectional side view, (B) is the side view seen from the arrow A direction of FIG. 3 (A). It is a figure which shows the structure of 4th Embodiment of the gas insulated bus based on this invention, Comprising: (A) is a sectional side view, (B) is the side view seen from the arrow A direction of FIG. 4 (A). It is a figure which shows the structure of 5th Embodiment of the gas insulated bus based on this invention, Comprising: (A) is sectional side view, (B) is the side view seen from the arrow A direction of FIG. 5 (A). It is a figure which shows the structure of other embodiment of the gas insulated bus based on this invention, Comprising: (A) is a sectional side view, (B) is the side view seen from the arrow A direction of FIG. 6 (A). It is a figure which shows the structure of other embodiment of the gas insulated bus based on this invention, Comprising: (A) is a sectional side view, (B) is the side view seen from the arrow A direction of FIG. It is a figure which shows the structure of other embodiment of the gas insulated bus based on this invention, Comprising: (A) is a sectional side view, (B) is the side view seen from the arrow A direction of FIG. 8 (A). It is a figure which shows the structure of other embodiment of the gas insulated bus which concerns on this invention, Comprising: (A) is a sectional side view, (B) is the side view seen from the arrow A direction of FIG. 9 (A). It is a figure which shows the structure of other embodiment of the gas insulated bus based on this invention, Comprising: (A) is a sectional side view, (B) is the side view seen from the arrow A direction of FIG. 10 (A). It is a figure which shows the structure of the conventional gas insulated bus, Comprising: (A) is a sectional side view, (B) is the side view seen from the arrow A direction of FIG. 11 (A). It is a figure which shows the structure of the conventional gas insulation bus, Comprising: (A) is a sectional side view, (B) is the side view seen from the arrow A direction of FIG. It is a figure which shows the structure of the conventional gas insulation bus, Comprising: (A) is a sectional side view, (B) is the side view seen from the arrow A direction of FIG. 13 (A).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Ground metal container 2 ... High voltage conductor 3 ... Insulating spacer 4 ... Insulating spacer support seat 5 ... High voltage side embedded electrode 6 ... Low voltage side embedded electrode 7 ... Insulator 8 ... Flange 9 ... Ground metal container end surface 10 ... High voltage conductor end face C1... Center axis C2 of rod or plate-like insulating spacer. First center axis C3 based on bending point of rod or plate-like insulating spacer. Bending point of rod or plate-like insulating spacer. Second central axis a as a base point ... An angle L1 between the central axis of the insulating spacer and the central axis of the ground metal container. Insulation creepage distance L2 of the insulating spacer ... Distance S1 from the bottom surface of the ground metal container ... To the inner surface of the ground metal container Adhesive material coating zone Z ... Support distance of high-voltage conductor

Claims (7)

In a gas insulated bus in which a high voltage conductor for energization is insulated and supported by an insulating spacer in a grounded metal container enclosing an insulating medium inside,
The insulating spacer is configured in a rod shape or a plate shape,
An end portion of the insulating spacer on the ground metal container side is fixed to an end flange itself of the ground metal container.   2. The gas-insulated bus according to claim 1, wherein the insulating spacer is installed so that a central axis of the insulating spacer forms a predetermined angle with a central axis of the ground metal container. In a gas insulated bus in which a high voltage conductor for energization is insulated and supported by an insulating spacer in a grounded metal container enclosing an insulating medium inside,
The insulating spacer is configured in a rod shape or a plate shape having at least one bending point,
An end portion of the insulating spacer on the ground metal container side is fixed to an end flange itself of the ground metal container. The insulating spacer has a first central axis and a second central axis from the bending point;
The first center axis and the center axis of the ground metal container are parallel to each other, and the second center axis and the center axis of the ground metal container are installed at a predetermined angle. The gas-insulated bus according to claim 3.   The gas-insulated bus according to any one of claims 1 to 4, wherein an end face of the high-voltage conductor and an end face of the ground metal container are configured to be in the same position in a vertical direction. .   The gas-insulated bus according to any one of claims 1 to 5, wherein an adhesive material is applied to an inner surface of the ground metal container located on a vertical lower projection surface of the insulating spacer.   The gas insulated bus according to any one of claims 1 to 6, wherein the insulating spacer is disposed vertically above a horizontal plane including a central axis of the high voltage conductor.

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