WO2015145654A1

WO2015145654A1 - Gas insulated busbar

Info

Publication number: WO2015145654A1
Application number: PCT/JP2014/058834
Authority: WO
Inventors: 将広藤岡; 祐貴兵頭; 真人川東
Original assignee: 三菱電機株式会社
Priority date: 2014-03-27
Filing date: 2014-03-27
Publication date: 2015-10-01

Abstract

　In the present invention, a gas insulated busbar is provided with a bellows, a current-carrying conductor, and an adsorbent. The bellows is disposed in the axial direction of the busbar. The current-carrying conductor is axially disposed in an insulating gas space enclosed by the bellows, and has a hollow portion open to the insulating gas space. The adsorbent is installed in the hollow portion of the current-carrying conductor.

Description

Gas insulated bus

The present invention relates to a gas insulated bus.

Patent Document 1 discloses a gas insulated bus. According to the gas-insulated bus, flanges are provided at both ends of the bellows filled with the insulating gas. And the adsorbent which adsorb | sucks the water | moisture content in insulating gas is embedded in the at least one flange of both ends of bellows.

JP 2000-31423 A

According to the technique described in Patent Document 1, the adsorbent is embedded in the flange provided at the end of the bellows. Conversely, in order to install the adsorbent, it is necessary to provide a flange on the bellows. Therefore, the bellows becomes longer by the amount of the flange, and the bellows size increases. Moreover, the process for providing a flange in a bellows is required, and a manufacturing cost increases.

One object of the present invention is to provide a technique capable of reducing the size of a bellows in a gas insulated bus provided with a bellows.

In one aspect of the present invention, the gas insulated bus includes a bellows, a current-carrying conductor, and an adsorbent. The bellows is disposed along the axial direction of the bus bar. The current-carrying conductor is disposed along the axial direction in the insulating gas space surrounded by the bellows, and has a hollow portion that is open to the insulating gas space. The adsorbent is installed in the hollow portion of the conducting conductor.

According to the present invention, the size of the bellows can be reduced in the gas insulated bus provided with the bellows.

FIG. 1 is an axial sectional view showing an example of the structure of a gas-insulated bus according to an embodiment of the present invention. FIG. 2 is a sectional view taken along line AA in FIG. FIG. 3 is an axial cross-sectional view showing an example of the structure of the gas-insulated bus according to the first comparative example. FIG. 4 is a conceptual diagram showing a gas-insulated bus according to Comparative Example 2.

The gas insulated bus according to the embodiment of the present invention will be described with reference to the attached drawings.

Embodiment.
FIG. 1 is an axial cross-sectional view showing a structural example of a gas insulated bus 1 according to an embodiment of the present invention. FIG. 2 is a sectional view taken along line AA in FIG. In FIG. 1 and FIG. 2, the central axis of the gas insulated bus 1 is indicated by the symbol “C”. The X direction is an axial direction (the direction of the central axis C), the Z direction is a vertical direction, and the Y direction is a direction orthogonal to the X direction and the Z direction. 1 and 2 show a three-phase collective gas-insulated bus 1.

The gas insulated bus 1 is provided with a cylindrical tank 2 filled with an insulating gas. A part of the tank 2 is provided with a telescopic bellows 3. More specifically, insulating

spacers

4a and 4b are provided at predetermined positions of the tank 2, and the bellows 3 is installed between the

insulating spacers

4a and 4b. As shown in FIG. 1, an adapter 5 may be provided between the end of the bellows 3 and the insulating spacer 4b. The bellows 3 may be a bellows type or a slide type (slide bellows).

The tank 2 and the bellows 3 are arranged along the X direction. An insulating gas is sealed in a space surrounded by the tank 2 and the bellows 3. This space is hereinafter referred to as “insulating gas space 6”.

In the insulating gas space 6, a current-carrying conductor 10 for power transmission is arranged. More specifically, the conducting conductor 10 is disposed along the X direction in parallel with the tank 2 and the bellows 3. In the present embodiment, three-phase conducting conductors 10 are arranged in the insulating gas space 6. Each current-carrying conductor 10 is disposed so as to penetrate through the

insulating spacers

4a and 4b, and is supported by the

insulating spacers

4a and 4b.

In the example shown in FIG. 1, each conducting conductor 10 in the insulating gas space 6 surrounded by the bellows 3 includes a fixed conductor 11, a fixed conductor 12, and a detachable conductor 13. The fixed conductor 11 is fixed to the insulating spacer 4a. The fixed conductor 12 is fixed to the insulating spacer 4b. The detachable conductor 13 is disposed so as to connect between the fixed conductor 11 and the fixed conductor 12. However, the detachable conductor 13 is detachable from the

fixed conductors

11 and 12. For example, one end of the detachable conductor 13 is connected to be fitted to the fixed conductor 11, and the other end is fastened to the fixed conductor 12 by a bolt 14.

Further, at least a part of the detachable conductor 13 is hollow. That is, the detachable conductor 13 has a hollow portion 15. The hollow portion 15 is open toward the insulating gas space 6, that is, is connected to the insulating gas space 6. More specifically, an opening 16 is formed in a part of the outer periphery of the detachable conductor 13, and the hollow portion 15 is connected to the insulating gas space 6 through the opening 16.

According to the present embodiment, the adsorbent 20 for adsorbing moisture and decomposition gas in the insulating gas is installed in the hollow portion 15 of the detachable conductor 13. For the installation or replacement of the adsorbent 20, it is convenient to use the opening 16 described above. Therefore, it is preferable that the opening 16 is formed to have a size that allows at least the adsorbent 20 to pass therethrough. In this case, the adsorbent 20 is installed at a position adjacent to the opening 16 through the opening 16. Further, in order to easily install and replace the adsorbent 20, it is preferable that the opening 16 is formed on the upper surface of the detachable conductor 13.

In the example shown in FIG. 1, the above-described bolt 14 is also exposed in the hollow portion 15. In this case, the operator can attach and remove the bolt 14 through the opening 16. Using the common opening 16, the adsorbent 20 can be installed or replaced, and the bolt 14 can be attached or removed, which is preferable.

FIG. 2 shows the arrangement of the detachable conductors 13-1, 13-2, and 13-3 for three phases in the YZ plane orthogonal to the X direction. As shown in FIG. 2, the detachable conductors 13-1, 13-2, and 13-3 are arranged at the positions of the vertices of the equilateral triangle. That is, the detachable conductors 13-1, 13-2, 13-3 are arranged in a regular triangle shape. Further, the positions of the centers of gravity of the detachable conductors 13-1, 13-2 and 13-3 coincide with the central axis C of the bellows 3.

Further, in FIG. 2, the detachable conductor 13-3 located at the bottom is displaced from the center line in the vertical direction (XZ direction). This is because dust tends to collect at the bottom of the bellows 3, and the detachable conductor 13-3 is separated from the bottom.

In addition, in the example shown by FIG.1 and FIG.2, although the detachable conductor 13 had the hollow part 15, it is not restricted to it. The fixed conductor 11 or the fixed conductor 12 may have a hollow portion 15. That is, it is only necessary that the hollow portion 15 is formed in at least a part of the conducting conductor 10. The adsorbent 20 is installed in the hollow portion 15.

<Comparative Example 1>
FIG. 3 is an axial cross-sectional view showing a structural example of the gas-insulated bus 1 ′ according to Comparative Example 1. In Comparative Example 1, a flange 30 is provided at the end of the bellows 3 and the adsorbent 20 is accommodated in the flange 30 as in the case of Patent Document 1 described above.

However, the bellows 3 becomes longer by the amount of the flange 30 that houses the adsorbent 20, and the size of the bellows 3 increases. Moreover, the process for providing the flange 30 in the bellows 3 is needed, and a manufacturing cost increases.

On the other hand, according to the present embodiment, the flange 30 as shown in FIG. 3 is unnecessary. Accordingly, the length and size of the bellows 3 can be reduced. Moreover, since the process for providing the flange 30 in the bellows 3 becomes unnecessary, manufacturing cost is reduced.

<Comparative example 2>
FIG. 4 is a conceptual diagram showing a gas-insulated bus according to Comparative Example 2. In Comparative Example 2, the structure 40 that houses the adsorbent 20 is attached to the inner peripheral surface of the bellows 3.

FIG. 4 shows the arrangement of the three-phase conducting conductors 10-1 (10-1 ′), 10-2 (10-2 ′), 10-3 in the YZ plane orthogonal to the X direction. Has been. The current-carrying conductors 10-1, 10-2, 10-3 are arranged in a regular triangle shape as in the case of the present embodiment shown in FIG. That is, the position of the center of gravity of the current-carrying conductors 10-1, 10-2, 10-3 is coincident with the central axis C of the bellows 3. The distance between two adjacent conductors 10-1, 10-2, and 10-3 is D.

However, when the structure 40 is attached to the inner peripheral surface of the bellows 3, it is necessary to separate the current-carrying conductor 10 from the structure 40 in order to ensure insulation. Specifically, as shown in FIG. 4, it is necessary to move the current-carrying conductors 10-1 and 10-2 to positions 10-1 'and 10-2', respectively. In this case, the arrangement of the current-carrying conductors 10-1 ', 10-2', 10-3 is not an equilateral triangle. Further, the positions of the centers of gravity of the conducting conductors 10-1 ′, 10-2 ′, and 10-3 are deviated from the central axis C of the bellows 3. The distance between the adjacent conducting conductors 10-1 '(10-2') and the conducting conductor 10-3 is D 'smaller than D.

Here, in order to ensure insulation between the current-carrying conductors 10, a certain level is required as the distance D '. In order to ensure the same degree of insulation as in the case of the distance D, the diameter of the tank 2 and the bellows 3 in which the current-carrying conductor 10 is accommodated must be increased. This means an increase in size and manufacturing costs.

On the other hand, according to the present embodiment, it is not necessary to attach the structure 40 on the inner peripheral surface of the bellows 3 in order to install the adsorbent 20. Therefore, an equilateral triangular arrangement such as the current-carrying conductors 10-1, 10-2, and 10-3 in FIG. 4 is possible. As described above, the equilateral triangular arrangement is optimal from the viewpoint of ensuring insulation between the current-carrying conductors 10 and contributes to the reduction of the diameter of the tank 2 and the bellows 3. That is, according to the present embodiment, it is possible to reduce the size and manufacturing cost of the gas insulating bus 1.

The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments, and can be appropriately changed by those skilled in the art without departing from the scope of the invention.

1, 1 'gas insulated bus, 2, tank, 3, bellows, 4a, 4b insulating spacer, 5 adapter, 6 insulating gas space, 10, 10-1, 10-2, 10-3 energizing conductor, 11 fixed conductor, 12 fixed Conductor, 13, 13-1, 13-2, 13-3 detachable conductor, 14 bolt, 15 hollow part, 16 opening part, 20 adsorbent, 30 flange, 40 structure.

Claims

Bellows arranged along the axial direction of the busbar;
An energizing conductor that is disposed along the axial direction in the insulating gas space surrounded by the bellows and has a hollow portion that is open to the insulating gas space;
A gas-insulated bus comprising: an adsorbent installed in the hollow portion of the conductive conductor.
The hollow portion is connected to the insulating gas space through an opening formed in the conductive conductor,
The gas-insulated bus according to claim 1, wherein the opening is formed to have at least a size through which the adsorbent passes.
The gas-insulated bus according to claim 2, wherein the opening is formed on an upper surface of the conductive conductor.
The conducting conductor is
A fixed conductor fixed to an insulating spacer;
A detachable conductor detachable from the fixed conductor,
The gas insulated bus according to any one of claims 1 to 3, wherein the detachable conductor has the hollow portion.
The detachable conductor is fastened to the fixed conductor by a bolt,
The gas-insulated bus according to claim 4, wherein the bolt is exposed in the hollow portion.
The gas insulated bus is a three-phase collective type,
The gas insulated bus according to any one of claims 1 to 5, wherein the current-carrying conductors are arranged for three phases in the insulating gas space.
The gas-insulated bus according to claim 6, wherein the three-phase conducting conductor is disposed at each vertex of an equilateral triangle in a plane orthogonal to the axial direction.
The gas insulated bus according to claim 6 or 7, wherein the position of the center of gravity of the three-phase conducting conductor coincides with the axial center of the bellows in a plane orthogonal to the axial direction.