JPS6312352B2 - - Google Patents

Description

[Detailed Description of the Invention] Gas insulated electrical equipment has come to be used in large quantities because gas insulation can improve performance and make it more compact.
Among these, regarding the installation of long coaxial cylindrical conductors such as gas insulated busbars or conduit aerial cables,
Depending on the conditions of the installation site, it is becoming necessary to install not only in a straight line or at a right angle, but also at any angle. In addition, when installing the cable inside a tunnel, it is necessary to carry the cable through many corners to the installation site.
Due to these needs, there is a strong desire for the emergence of conductors with large deviation angles. Conventionally, in order to take the declination angle on a conductor,
As shown in FIG. 1, a central conductor 1 is concentrically supported on a metal cylindrical sheath 7 by an insulating spacer 8, and a central conductor 2 is concentrically supported on a metal cylindrical sheath 7 by an insulating spacer 8. The opposite ends of the sheaths 7 are electrically connected to each other by a declination conductor connection part 9, and correspondingly, the metal cylindrical sheaths 7 are joined by a metal bellows 6, and the inside is filled with an insulating gas.

As illustrated in FIG. 2, most of the deflection conductor connecting portions 9 are formed by so-called tulip-type contacts.

In Fig. 2, 1a and 2a are both center conductors 1 and 2.
In this example, one conductor 1 has an enlarged portion 1b in the radial direction from its center while transitioning to the conductor end 1a. 3,3'
is a contactor having a protrusion that contacts the circumferential surfaces of the conductor ends 1a, 2a, and the contactor 3,
3' covers and straddles the conductor ends 1a and 2a;
The outer surfaces of the contacts 3, 3' are constantly connected to the protruding parts of the contacts 3, 3' by the conductor ends 1a, 2a by a plurality of springs 4.
It is configured such that it can be held down and a sufficient electrical connection can be made. Note that 5 is a shield fixed to the enlarged portion 1b of the conductor 1 and covering the connection portion.

As shown in the figure, the center conductor 2 intersects with the center conductor 1 at an angle of declination θ, but between the declinations when the angle θ is zero (coaxial), both center conductors are in contact. Sufficient electrical connection is maintained by the terminals 3 and 3', but the magnitude of this declination angle θ, that is, the rotation angle, is limited by the following reasons, and the range in which the maximum declination angle can be taken is also limited. limited to a few degrees.

(1) One end of the conductor end 2a comes into contact with the contactor 3' at a certain angle.

(2) At a certain angle, the conductor 2 and the reduced diameter conductor end 2a
The inclined portion 2b between the two contacts the edge 5a of the shield 5.

(3) At a certain angle, one end of conductor end 2 is connected to conductor end 1.
Contact with the end face of a.

(4) If the deflection angle increases, the contact force between the conductor ends 1a, 2a and the contacts 3, 3' becomes unbalanced, which may impair the current carrying function.

Of course, one of the above problems (1) to (3) usually occurs, but as explained above, there are problems in increasing the declination angle with conventional tube-shaped contacts. In addition, since the above configuration has a large number of parts, a high degree of management is required to improve reliability, and the manufacturing cost is also high.

The present invention improves the deflection angle connection using the above-mentioned tulip type contact and provides a large deflection angle conductor that can take a large deflection angle. In the connection part having the twin spring contact described above, if the contact is divided into many parts instead of just two, the deflection angle between both conductors can be set in any direction with respect to the central axis of one conductor. However, in actual installation and use, it is often sufficient to have a configuration that allows a sufficient deviation in at least one direction.

In the present invention, the ends of both conductors are formed as hemispherical ends having circular mating surfaces, a rotating surface contactor is mounted between the circular mating surfaces, and the hemispherical ends are centered on the mating surfaces. It is characterized by being fixed on an axis passing perpendicularly to the shaft.

The embodiments shown in the drawings will be explained below.

FIG. 3 is a cross-sectional view of the main part of the embodiment of the present invention, and FIG. 4 is a side view of the embodiment of FIG.

1 and 2 are conductors, each of which is formed as a hemispherical end portion 10, 20 having a circular mating surface 11. A contact 12 (described later) is mounted between both mating surfaces 11, and one end of a support shaft 13 inserted into a shaft hole passing perpendicular to the center of the circular mating surface 11 is provided within the spherical surface of the hemispherical end 20. A coil spring 1 is supported at the bottom of a hole 14 communicating with the shaft hole, the other end of the support shaft 13 is provided within the spherical surface of the hemispherical end 10, and is held at the bottom of a hole 15 communicating with the shaft hole.
By tightening the cap nuts 17 through the conductors 1 and 2, the ends 10 and 20 are rotatably tightened while being pressed against the contact 12, and the hemispherical ends 10 and 20 protrude from the bases of the conductors 1 and 2. end face 18 adjacent to
The hemispherical end portions 10, 2 are connected by the shaft 13.
0 is rotatably pivoted with the contact 12 therebetween, a concave surface corresponding to these is maintained so as to maintain a constant gap a between the spherical surface and the spherical surface of the peripheral portion of the opposing hemispherical end. It is formed as. This gap a
This is to prevent metal surface sliding in areas other than the contact portion.

Therefore, in FIG. 3, the conductor 2 can be rotated relative to the conductor 1 in a direction perpendicular to the plane of the paper.

Next, the contacts will be explained.

In FIG. 5, reference numeral 12a denotes a spherical conductive contact, and a plurality of spherical contacts 12a are inserted into grooves b formed concentrically around the shaft hole in the opposing circular mating surfaces 11. By inserting
When the contact 12a rotates to obtain the deflection angle, it rotates within the groove b, thereby reliably forming an electrical connection between the hemispherical ends 10 and 20.

FIG. 6A shows a conductive disk with a corrugated cross section, concentrically extending from the center with convex portions, concave portions, and convex portions, as shown in the partial oblique view in FIG. 6, between the circular mating surfaces 11. A structure in which sufficient elasticity can be imparted to the electrical connection between both hemispherical end portions 10 and 20 by inserting a contactor 12b made of A contactor 12c made of concentric corrugated conductive disks with a corrugated cross section.
It is shown. The interrupt groove p may be a partial groove that does not reach the center from the periphery. According to such a configuration, the contact pressure by the contact between the circular mating surfaces of both hemispherical end portions 10 and 20 can be made uniform.

In FIG. 7, a hole 21 for holding a plurality of rod-shaped contacts 12d is provided in the mating surface of either of the hemispherical end portions 10, 20, and the contacts 12d are axially moved by the coil spring 19, and the leaf spring 19 The tip of the rod-shaped contact 12d is smoothly formed and presses against the opposing circular mating surfaces to form an electrical connection.

As explained above, the deflection angle connection part of the center conductor is formed, but in correspondence with the center conductor having such a deflection angle connection part, it is possible to extend and contract it on the outside like a bellows, for example, although it is not shown in the figure. If a flexible metal pipe is used as a joint and the metal sheath extending from both pipes is connected to cover the center conductor, and when in use, the sealed internal space is filled with insulating gas.
It can be a gas insulated busbar or a conduit aerial cable. The declination angle connection part of the center conductor has already been explained, and since the outer sheath is also made of a stretchable and flexible tube as a joint, the direction of the declination angle is limited within one plane, but a large declination angle On the other hand, the conductor end forms a spherical shape by combining the hemispherical ends, and even if it is rotated to take the declination angle, the external shape of the connection part will not change other than due to the declination angle of the conductor. There are almost no factors that cause this change, and since the supporting shaft ends of both hemispherical end portions are formed so as not to protrude from the spherical surface of the hemispherical end portion, a shield for mitigating the electric field at the connection portion is not required, and the connection The structure of the part can be simplified, the size can be reduced, and a conductor with a large deflection angle can be obtained.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the case of taking the declination angle in a conventional gas-insulated bus bar and conduit aerial cable, and Fig. 2 shows an example of the declination conductor for taking the declination angle in Fig. 1. 3 is a cross-sectional view of the main part of the embodiment of the present invention, FIG. 4 is a side view of the embodiment of FIG. 3, and FIGS. 5, 6 A, B,
C, FIG. 7 is a diagram showing a contact portion used in the present invention. 1, 2...Conductor, 3,3'...Contactor, 4...
Spring, 5... Shield, 6... Metal bellows, 7
... Sheath, 8 ... Spacer, 9 ... Deviation conductor connection section, 10, 20 ... Hemispherical end, 11 ... Circular mating surface, 12 ... Rotating surface contactor, 13 ... Support shaft, 14 , 15, 21...hole, 16...spring, 1
7... Cap nut, 18... End face, 19, 19'...
...Spring.

Claims (1)

[Scope of Claims] 1. The ends of both center conductors of a coaxial cylindrical conductor each consisting of a center conductor and a metal sheath are formed as hemispherical end portions having circular mating surfaces, and a rotating surface is formed between the circular mating surfaces. A contactor is attached, the hemispherical end portions are fixed on an axis passing perpendicularly through the center of the mating surface, and an expandable joint tube is formed between the metal sheaths correspondingly. Large declination conductor. 2. A spherical contact is used as the rotating surface contact, and the plurality of spherical contacts are mounted in a groove formed concentrically with respect to an axis passing through the center of the mating surface. Large deviation angle conductor according to item 1. 3. As the rotating surface contactor, a concentric waveform disc-shaped contact with a wave-shaped cross section, or a contactor having a radial groove in the concentric waveform disc-shaped contact, is used,
2. The large deviation angle conductor according to claim 1, wherein the contactor is mounted between circular mating surfaces. 4. A rod-shaped contact is used as the rotating surface contact, and a pressing spring is inserted into a plurality of holes formed on one mating surface to fit the rod-shaped contact. Large declination conductor.