JPS6332007B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a three-phase pipe bus for transporting electric power.

Conventionally, there has been a device of this type as shown in FIG. In the figure, 1a is the first phase bus, 1b is the second phase bus, 1c is the third phase bus, 2a, 2b, 2
c is a support insulator that supports these busbars,
Reference numerals 3a, 3b, and 3c are support fittings for fixing these support insulators, and 4 is a tube that houses the above-mentioned structure and serves as an outer covering. In this structure, the centers Oa, 1c, and
Each busbar is supported by support insulators 2a, 2b, and 2c arranged along perpendicular lines extending from Ob and Oc to the inner surface of the tube. Therefore, in order to support the busbars via the support fittings 3a, 3b, and 3c, it is necessary to place a supporting insulator in a limited space between the support fittings and the busbars. Not only the surface electric field strength of the insulator, but also the electric field strength in the direction penetrating the supporting insulator becomes high as well, which has the disadvantage that the inner diameter of the tube cannot be reduced.

This invention has been made to eliminate the above-mentioned drawbacks of conventional devices.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings. FIGS. 2a, 2b, and 2c are explanatory diagrams each showing a three-phase pipeline bus line according to an embodiment of the present invention in a cross section perpendicular to the axis O of the pipe 4. FIG. In Figure 2 a, b, and c, 1a is the first phase bus line, 1
b is a second phase busbar, 1c is a third phase busbar, and the first phase busbar 1a and the third phase busbar 1c are located at a substantially horizontal position passing through the axis O of the tube 4 inside the tube 4 at a predetermined interval. are juxtaposed. The second phase generatrix 1b is located below these generatrixes 1a, 1c and on a vertical line passing through the axis O of the tube 4. Hereinafter, the first phase bus bar 1a will be referred to as a first bus bar and a third phase bus bar 1c.
will be referred to as a second bus bar, and the second phase bus bar 1b will be referred to as a third bus bar. In Figure 2a, 3
a is a support fitting for the first generatrix 1a, which is an isosceles triangle whose base is a line connecting the axes Oa and Ob of the first generatrix 1a and the third generatrix 1b, and has an apex Pa on the inner surface of the tube 4. Pipe 4 near the above apex Pa of OaObPa
is fixed on the inner surface of. 2a is the above-mentioned support fitting 3
It is a rod-shaped support insulator that has one end fixed to a and the other end connected to and supports the first bus bar 1a, and its axis is on the line connecting Oa and Pa. Second
In Figure b, 3b is a support fitting for the third generatrix 1b, and each axial center of the first generatrix 1a and the third generatrix 1b is
The line connecting Oa and Ob is the base and the apex is on the inner surface of tube 4.
It is fixed to the inner surface of the tube 4 near the apex Pb of the isosceles triangle Oa, Ob, Pb having Pb.
2b is a rod-shaped support insulator whose one end is fixed to the support fitting 3b and whose other end is connected to and supports the third bus bar 1b, and its axis is on the line connecting Ob and Pb. In Figure 2c, 3c is the second
A supporting metal fitting for the second bus bar 1c, which
An isosceles triangle ObOcPc whose base is a line connecting the axes Oc and Ob of the third generatrix 1b and the apex Pc on the inner surface of the tube 4 is fixed to the inner surface of the tube 4 near the apex Pc. There is. 2c is a rod-shaped supporting insulator whose one end is fixed to the support fitting 3c and whose other end is connected to and supports the second bus bar 1c.

By configuring as described above, the space for arranging the support insulators 2a, 2b, and 2c becomes larger, the electric field strength applied to the support insulators becomes lower, and the inner diameter of the tube 4 can be reduced. Object 2a,
2b and 2c may all have the same structure. FIG. 3 shows an embodiment in which the first phase bus bar 1a and the third phase bus bar 1c are arranged above the center O of the pipe, and FIG. This is an example in which it is held by a support insulator 2a. It goes without saying that in these cases, the second phase and third phase busbars also have the same structure and produce the same effects. In addition,
The support insulators 2a, 2b, and 2c each have the same cross section, or even in different cross sections, the support metal fitting 3
It can be arranged by simply changing the shapes of a, 3b, and 3c.

As described above, according to the present invention, since the electric field strength applied to the support insulator is reduced, the inner diameter of the tube housing the bus bar can be reduced, which is economical.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional three-phase pipeline busbar, FIG. 2 is a sectional view showing one embodiment of the present invention, and FIGS. 3 and 4 are sectional views showing other embodiments of the invention, respectively. It is. In the figure, 1a to 1c are bus bars, and 2a to 2c are support insulators 4, which are tubes. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A cylindrical tube, first and second generatrix lines installed in the tube, extending substantially parallel to its axis, and disposed substantially horizontally at a predetermined interval in a cross section perpendicular to the axis; A three-phase busbar consisting of a third busbar located below the busbar and between these busbars, with the line connecting the axes of the first and third busbars as the base, and below the first busbar and the above-mentioned busbar. An isosceles triangle whose base is a line connecting the apex of the isosceles triangle having the apex on the inner surface of the tube and the axes of the second and third generating lines, and having the apex on the inner surface of the tube below the second generating line. three supporting metal fittings each fixed to the inner surface of the tube in the vicinity of the apex of the pipe, and three rod-shaped rod-shaped metal fittings each having one end fixed to each of these supporting metal fittings and the other end connected to the generatrix, respectively. A three-phase conduit busbar with supporting insulation.