JPS637428B2 - - 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, when installing long coaxial cylindrical conductors such as gas-insulated busbars or conduit aerial cables, it is necessary to install them not only in straight lines and at right angles, but also at any angle, depending on the conditions of the installation site. It's starting to happen. Furthermore, when laying a conductor in a tunnel, it is necessary to carry it to the installation site through many corners, and due to these needs, there is a strong desire for a conductor with a large deviation angle. Conventionally, in order to obtain a declination angle on a conductor, as shown in FIG. Opposite ends of the center conductor 2 supported concentrically on the cylindrical sheath 7 are conductor-connected by the declination conductor connection part 9,
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 central conductors 1,
2 shows reduced diameter conductor ends, in particular one conductor 1 having a radial enlargement 1b from its center while transitioning to the conductor end 1a. 3 and 3' are contacts having protruding parts that come into contact with the circumferential surfaces of the conductor ends 1a and 2a, and the contacts 3 and 3' cover and straddle the conductor ends 1a and 2a, and The outer surfaces of the contacts 3, 3' are constructed such that the contacts 3, 3' are always pressed against the conductor ends 1a, 2a by a plurality of springs 4 so that a sufficient electrical connection can be made. In addition,
A shield 5 is fixed to the enlarged portion 1b of the conductor 1 and covers 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 time the angle θ is zero (coaxial) and a certain angle of declination, both center conductors are connected to the contactor. A sufficient electrical connection is made by 3, 3'.

However, the magnitude of this deflection angle θ, that is, the rotation angle, is limited by the following reasons.

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

(2) Similarly, at a certain angle, the inclined portion 2b between the conductor 2 and the reduced diameter conductor end 2a comes into contact with the edge 5a of the shield 5.

(3) Similarly, one end of the conductor end 2a contacts the end surface of the conductor end 1a at a certain angle.

(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.

As explained above, there are problems in increasing the deflection angle with conventional tube-type contacts, and the number of parts in the above configuration is large, so advanced management is required to increase reliability. is required, and the production cost is also high. The present invention improves the deflection angle connection section using the above-mentioned tulip type contactor and provides a large deflection angle conductor connection section which can take an even larger deflection angle.

The embodiments shown in the drawings will be described below. Third
The figure is a cut-away front view of the shield of an embodiment of the present invention, Figure 4 is a cut-away top view of the shield of the same embodiment, and Figure 5 is a diagram of the embodiment of Figure 3 rotated by an angle of deviation θ. It is.

In the figure, the end of the conductor 1 is formed as a spherical end 10 . Then, a part of the spherical end 10 on the opposite side to the conductor 1 is shaved off, and the conductor mounting end 1
1 is formed. The end of the conductor 2 is formed so as to end at the conductor attachment end surface 12. The conductor mounting end faces 11 and 12 are faced to each other with an appropriate distance between them, and a flexible conductor 13 made by laminating thin copper plates or aluminum plates or braided copper wire is fixed to both the mounting end faces 11 and 12 with bolts 14. and electrical connections are made. 15 is a right cylindrical shield, and its length has enough room on the conductor 2 side to insert a piston ring, which will be described later, between it and the conductor 2,
On the conductor 1 side, the length is such that the open end of the right cylindrical shield 15 is exactly at the top P of the spherical end 10, and its inner diameter is such that there is a slight gap between the inner diameter and the opposite conductor end. The open end of the right cylindrical shield 15 on the conductor 1 side has two ears 1 facing each other in the diametrical direction.
6, and an annular groove 17 is formed inside the open end on the conductor 2 side. Before connecting the flexible conductor 13 as described above, the piston ring 18 is fitted into the annular groove 17 of the right cylindrical shield 15, and then the conductor 2 is fitted, and the right cylindrical shield 15 is once inserted from the end of the conductor. After moving the flexible conductor 13 to a separated position and fixing the flexible conductor 13,
One end of this right cylindrical shield 15 is connected to a flexible conductor 1
3 in the direction of the spherical end 10;
The two ears 16 are rotatably fixed to the spherical end 10 by short pins 19 on both sides of the spherical central axis of the spherical end 10 . In this case, a long pin is used to form a spherical end 10 and a right cylindrical shield 1.
5 and may be supported. A lead 20 for fixing the shield potential is provided as necessary.

As can be understood from the above explanation, the pin 19 is located on the diameter of the sphere forming the spherical end 10, so the conductor 2 is aligned with the conductor 1 with the pin 19 as the axis as shown in FIG. When the right cylindrical upper shield 15 is rotated to the position of the deflection angle θ, the opposite open end of the right cylindrical upper shield 15 rotates without any hindrance while leaving a gap between it and the surface of the spherical end portion 10. At this time, as already explained, on the conductor 2 side, the right cylindrical upper shield 15 is connected to the piston ring 1 at the end thereof.
8, and the change in length that occurs between both conductors due to rotation is caused by the right cylindrical upper shield 15 sliding on the conductor 2 via the piston ring 18, It is possible to achieve smooth rotation with the movement of As a matter of course, the flexible conductor 13 needs to be connected so as to exhibit sufficient flexibility in the direction of rotation.

As explained above with reference to FIGS. 3 to 5, in the present invention, one end of the right cylindrical shield 15 is connected to the center conductor 1.
Pin 1 on the spherical center axis of the spherical end 10 of
Since it is rotatably supported by 9, when it is rotated so as to form an angle of deviation θ with respect to the other center conductor 2, this axis of rotation is located at the end of the right cylindrical shield 15. Therefore, a large deformation θ can be obtained. This deflection angle θ can be increased by making the spherical end portion 10 larger in comparison to the diameter of the central conductor 1.

Further, as described above, since the right cylindrical shield 15 is connected to the spherical end portion 10 by the pin 19, the shield 15 is held in a stable state with the center conductor 1, and both center conductors 1, 2 Stable movement can be maintained between the shield potential fixing leads 20, and there is no fear that the shield potential fixing lead 20 will rotate and come off due to vibration or the like.

Furthermore, although a right cylindrical shield 15 is used,
A device having such a shape can be easily manufactured using a metal material using a lathe or the like.

As described above with respect to the embodiments, according to the present invention, it is possible to give a large declination angle to the conductor. Correspondingly, on the outside, a flexible metal tube, such as a bellows, is used as a joint and connected to a metal sheath extending from both sides, and the
When in use, the sealed internal space is filled with insulating gas.

When the center conductor takes a declination angle, or when both conductors stretch or contract, the conductors connected by the flexible conductor smoothly rotate relative to each other and do not stretch or , is displaced according to the shrinkage. Therefore, it is suitable for carrying into tunnels and for use as an aerial cable for conduits laid in places with slopes, and when laying in places where there is a risk of ground subsidence, it is necessary to pass through this zone. This problem can be solved by connecting the aerial cable unit having the large deflection angle conductor connection portion according to the present invention to an appropriate location on the aerial cable line.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the case where a declination angle is taken in a conventional gas-insulated conduit aerial cable.
The figure shows an example of the connection part according to the deflection angle in FIG. 1, with the shield cut away, and FIGS. 3, 4, and 5 are front and top views, respectively, of an embodiment of the present invention with the shield cut away. A diagram is shown in which the angle θ and the declination angle θ are taken. DESCRIPTION OF SYMBOLS 1, 2... Center conductor, 3, 3'... Contact, 4... Spring, 5... Shield, 6... Metal bellows, 7... Sheath, 8... Spacer, 9... Deflection conductor connection part, 10...
Spherical end portions, 11, 12... conductor mounting end surfaces, 13...
Flexible conductor, 14... Bolt, 15... Right cylindrical shield, 16... Shield ear, 17... Annular groove,
18... Piston ring, 19... Pin, 20... Shield potential fixing lead.

Claims (1)

[Claims] 1. A coaxial cylindrical conductor consisting of a center conductor and a metal sheath, with one end of the center conductor having a spherical shape and facing the end of the other center conductor, and connecting both ends with a flexible conductor. , one end of the right cylindrical shield surrounding the flexible conductor is slidably fitted to the end of the other center conductor, and the other end ear of the shield is placed on the spherical center axis of the spherical end. A large deflection angle conductor connection section characterized by being rotatably fixed by pins on both sides.