JPH07327311A - Three-phase bus - Google Patents

Abstract

PURPOSE:To support a conductor in a duct, at the intermediate part thereof, by means of an insulating spacer while conducting the duct on the opposite sides thereof. CONSTITUTION:A pair of ducts are coupled through an insulating spacer 21 for supporting a conductor 24 penetrating the spacer 21. The spaces on the opposite sides of the insulating spacer 21 are conducted through a small diameter part 24a of the conductor 24 and notches 24b, 24c made on the opposite sides thereof at positions making an angle of 90-180 deg..

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-phase bus bar, which supports an intermediate portion in the longitudinal direction of a conductor.

[0002]

2. Description of the Related Art Gas insulated switchgears are installed in power plants and substations. FIG. 7 (a) shows a circuit diagram of the gas-insulated switchgear with a single line, and FIG. 7 (b) is a block diagram of its components. In the figure, DS is a disconnecting switch, ES is a grounding device, and C
B is a circuit breaker, CH is a cable head, Tr is a transformer, P
CT indicates an instrument transformer.

As shown in FIG. 7 (b), tanks 1 to 6 in which each device is housed are connected by three-phase buses 7 and 8. The three-phase bus bar accommodates three-phase conductors in a substantially cylindrical pipe, and its length varies depending on the layout of the tank. As shown in FIG. 8 which is an AA cross section of the three-phase bus bar 7, a portion supporting the conductor is provided at an intermediate position of the long three-phase bus bar 7.

That is, the structure is as follows. Flange portions 11, 12, and 13 are formed at the same position in the length direction of the pipeline 10 and at mutually 90 ° or 180 ° positions, and the blind portions 14 are formed on the flange portions 11, 12, and 13, respectively.
Is airtightly attached via a bolt (not shown). The support member 15 made of an insulating material is provided on the inner surface of the blind plate 14.
Of the three phases are connected to the other end of the support member 15, respectively.

[0005]

However, since the number of flanges for mounting the support member must be formed around the pipe as many as the conductors, the structure of the pipe becomes complicated and the cost becomes high.

[0006] Therefore, an object of the present invention is to provide a three-phase bus which solves the above problems.

[0007]

The structure of the present invention for attaining such an object is a circle for three phases accommodated in the inside of the pipe by connecting insulating spacers to both ends of the pipe having a substantially cylindrical shape. In a three-phase busbar in which a rod-shaped conductor is airtightly penetrated through an insulating spacer to fill the insulating gas in the pipeline, the pipeline is composed of two or more split pipelines and a space between adjacent split pipelines is A second insulating spacer is interposed, each conductor is penetrated through the second insulating spacer, and a small-diameter portion having a small outer diameter is formed at a substantially intermediate position of a portion penetrating the second insulating spacer in the length direction of the conductor. However, notches with a substantially arcuate cross section are formed from the outer peripheral surface of the conductor to the position outside the end surface of the insulating spacer to connect the interiors of the divided conduits to each other, and The angle formed by a pair of notches around And wherein the set to 0 ° to 180 °.

[0008]

The portions other than both ends of the conductor for three phases are supported by the second insulating spacer. The attachment of the second insulating spacer is simple because the structure can be made substantially the same as that provided at both ends of the connected divided pipelines. Since the insides of the divided pipelines communicate with each other through the pair of notches and the small diameter portion and the second insulating spacer, it suffices to manage the state of the insulating gas inside any of the divided pipelines.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings.

(A) First Embodiment A first embodiment of a three-phase bus bar according to the present invention is shown in FIGS.
As shown in FIG. 2, a pair of divided pipe lines 2 is formed by dividing one pipe line.
0 and 20 are connected via a second insulating spacer 21. The ends of the divided pipeline 20 are connected to the other pipelines 23, 23 via insulating spacers 22, respectively. As shown in FIG. 3, the conductors 24 for three phases penetrate and are supported by the insulating spacers 21 and 22.

FIG. 4 shows an enlarged view of the connecting portion of the divided pipe lines 20, 20. Ring-shaped metal spacer 25 and split conduit 2
The second insulating spacer 21 is sandwiched between the flange portions 20a by connecting the flange portions 20a of No. 0 with the bolts 26, and the O-ring 27 is provided between the second insulating spacer 21 and the flange portion 20a. Is provided.
A tubular portion 21a is formed at three locations on the second insulating spacer 21, and a metal pipe 28 is fitted in the tubular portion 21a. Since the second insulating spacer 21 is a mold cast product, the positions of the pipes 28 for the three phases are set accurately with the precision of the mold. The conductors 24 are inserted into the pipes 28, respectively.
A cutout portion or the like is formed on the outer peripheral surface of the portion inserted into 8, and the insides of the divided pipeline 20 communicate with each other.

That is, it is as follows. 4D
As shown in FIG. 1 in detail of the portion, a small diameter portion 24a having an outer diameter smaller than that of the other portion is formed at a substantially intermediate position of a portion of the conductor 24 which is inserted into the pipe 28.
4a and the pipe 28, the cutout portion 24b extending from the small-diameter portion 24a to the outside of the end surface of the pipe 28 is formed on the outer peripheral surface of the conductor 24 in order to communicate the flow passage 29 and the insides of the left and right divided pipelines 20. , 24c are formed. Notch 24
b and 24c have a cut surface formed in an arc shape when cut along a plane perpendicular to the axis of the conductor 24 so that a flat surface in contact with the outer peripheral surface of the small diameter portion 24a is formed on the outer peripheral surface of the conductor 24. A flow passage 30 is formed between the portion 24b and the pipe 28, while a flow passage 31 is formed between the cutout portion 24c and the pipe 28. As shown in FIG. 1B, the cutouts 24b, 2
The angle formed by 4c is 180 ° in this embodiment.

As described above, the small diameter portion 24a is formed on the conductor 24, and the cutout portions 24b and 24c are formed at positions 180 ° from each other.
The notch having the arcuate cross section with a flat machined surface is the easiest to process, but when a single notch having such a shape is formed from one end to the other end of the pipe 28, the outer periphery of the conductor 24 is formed. This is because the flow path is formed only on one side of the surface, and the conductor swings in the direction of the flow path, causing eccentricity.

Next, the structure of the portion where the conductor 24 penetrates the insulating spacer 22 is shown in FIG. Insulating spacers 22 partition the insulating gas and support conductors 24. In the same manner as described above, the insulating spacer 22 is airtightly attached between the divided pipe line 20 and the pipe line 23, and the embedded conductors 34 for three phases are embedded in the insulating spacer 22 to seal the two. There is. Then, the hexagon socket head cap screw 35 is inserted into the mounting hole 24e of the flange portion 24d formed at the end of each conductor 24, and the hexagon socket head cap screw 35 is screwed into the tap hole 34a of the embedded conductor 34. , The conductors 24 and the embedded conductors 34 are integrally coupled. Although FIG. 5 shows the structure at the right end of FIG. 2, the structure at the left end is the same as that of FIG.

In addition, a connecting portion 36 using a contact for connecting the conductors 24 is provided in the divided conduit 20 as shown in FIG.

Next, the operation of such a three-phase bus will be described.

The long conductor 24 disposed over the pair of divided conduits 20 has a second insulating spacer 21 at the middle portion thereof.
A pair of split conduits 20 supported by and interconnected by
Insulating spacers 22 are airtightly attached to both ends of each of the divided pipes 20, and an insulating gas is filled in each of the divided pipelines 20. The insulating gas in both of the divided conduits 20 is the flow path 2 shown in FIG.
Since they are communicated with each other through 9 to 31, the insulating gas can flow in the direction indicated by the arrow or the opposite direction.
Therefore, it is sufficient to manage the pressure of the insulating gas in one of the divided conduits 20.

(B) Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. In the present embodiment, the notch portion 2 which is 180 ° in the first embodiment is used.
The angle formed by 4b and 24c is 9 as shown in FIG. 6 (b).
It is set to 0 °.

The other structure and operation are the same as those of the first embodiment, and the description thereof will be omitted.

In the first and second embodiments, the pair of cutouts is 1
The case where the angle is 80 ° and the case where the angle is 90 ° are shown, but the number may be any number within the range of 90 ° to 180 °. In addition, in Examples 1 and 2, one pipeline is divided into two divided pipelines and only one second insulating spacer is interposed, but it may be divided into three or more divided pipelines. it can.

[0021]

As can be seen from the above description, according to the three-phase bus of the present invention, one pipeline is divided into a plurality of divided pipelines and the second insulating spacer is interposed between the divided pipelines. Since they are connected to each other, the middle portion of the long conductor can be supported with a simple structure. Further, since the flow path is formed between the second insulating spacer and the conductor, the insides of the plurality of divided pipelines communicate with each other, and the gas division is not subdivided. Therefore, the management of the insulating gas does not become complicated.
Furthermore, since the flow path is formed by forming a small diameter portion and a pair of notches having a substantially arcuate cross section in the conductor and the angle formed between the pair of notches is 90 ° to 180 °, it is easy to process the notches. Yes, the conductor does not run out.

[Brief description of drawings]

1 relates to a main part of a first embodiment of a three-phase bus according to the present invention, (a) is a detailed view of a D part of FIG. 4, (b) is a G of (a).
-G arrow view.

FIG. 2 is an overall view showing Example 1 of a three-phase bus bar according to the present invention.

FIG. 3 is a view on arrow BB in FIG.

FIG. 4 is an enlarged view of a C portion of FIG.

5 (a) is an enlarged view of a portion E in FIG. 2, (b) is (a).
FIG.

FIG. 6 relates to Example 2 of the three-phase bus bar according to the present invention,
(A) is a detailed view of a main part, (b) is a view taken along the line H-H of (a).

FIG. 7 relates to a gas insulated switchgear, (a) is a circuit diagram,
(B) is a block diagram.

FIG. 8 shows a main part of a conventional three-phase bus, and FIG.
(B) AA arrow line view.

[Explanation of symbols]

 20 ... Divided conduit 21 ... Second insulating spacer 22 ... Insulating spacer 24 ... Conductor 24a ... Small diameter portion 24b, 24c ... Notched portion

Claims (1)

[Claims] 1. An insulating gas is provided in the pipeline by connecting insulating spacers to both ends of the substantially tubular pipeline, and airtightly penetrating the three-phase round rod-shaped conductors accommodated in the pipeline into the insulating spacer. In the three-phase bus bar filled with, the second insulating spacer is interposed between adjacent divided pipes and the pipe is composed of two or more divided pipes, each conductor in the second insulating spacer. A small diameter portion with a small outer diameter is formed at a substantially intermediate position of the portion that penetrates through the second insulating spacer in the length direction of the conductor, and is the outer peripheral surface of the conductor from the small diameter portion to the end surface of the insulating spacer. Notches each having a substantially arcuate cross-section are formed up to the outer position to communicate the insides of the divided conduits with each other, and the angle formed by the pair of notches around the axial center of the conductor is 90 ° to 18 °.
A three-phase bus bar set at 0 °.