JP2906390B2 - Jumper for overhead transmission line between narrow lines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jumper device for an overhead transmission line between narrow lines.

[0002]

2. Description of the Related Art Recently, a narrow line overhead transmission line requiring a narrow land width has been studied because of the difficulty in acquiring land for an overhead transmission line and a rise in land price. FIGS. 4 and 5 show the basic configuration of an overhead transmission line between narrow lines. In the figure, 1 is a main line of an overhead transmission line, 3 is a jumper wire, 5 is a steel tower trunk, 7 is a steel tower arm, 9 is a tension insulator series, and 11 is a V-shaped insulator.

[0003] In other words, in the narrow line overhead transmission line, the distance D between the adjacent main lines 1 is reduced by attaching the tension insulator string 9 near the base of the tower arm 7. However, in this structure, if the jumper wire 3 is disposed immediately below the tension insulator string 9, the insulation interval between the jumper wire 3 and the tower body 5 cannot be secured. Therefore, in a conventional jumper device for an overhead transmission line between narrow lines, a V-shaped insulator 11 is attached below the tower arm 7, a middle portion of the jumper wire 3 is viewed from above at a lower end of the V-shaped insulator 11, and the jumper wire is viewed from above. 3 is supported so that an intermediate portion thereof is located outside the both ends, thereby maintaining an insulation interval between the jumper wire 3 and the tower body 5.

[0004]

However, the conventional jumper device for an overhead transmission line between narrow lines has the following disadvantages. Since a V-shaped insulator whose upper end is widened in the longitudinal direction of the tower arm is used, the length of the tower arm must be increased in order to ensure a sufficient insulation interval between the jumper wire and the tower body. When the voltage exceeds 154 kV, the length of the tower arm becomes longer, and the tower becomes larger. Since the jumper wire is bent in a form in which the downward sag and the outward bulge are combined, it is difficult to keep the shape of each jumper wire constant, and the appearance is not good.

SUMMARY OF THE INVENTION An object of the present invention is to provide a jumper device for an overhead transmission line between narrow lines, which can reduce the length of a tower arm and stabilize the shape of a jumper wire in view of the above problems. .

[0006]

According to the present invention, a jumper wire is constituted by a rigid conductor and flexible conductors connected to both ends of the jumper wire .
The aluminum pipe, an intermediate part is positioned keeping a required insulation distance on the side of the tower trunk made from those two end portions are bent shaped so as to be positioned below the front end side of the tension insulator string, The middle part of this rigid conductor is supported by a polymer insulator with a FRP core suspended from the point of attachment of the tower arm to the end of the tension insulator, and both ends of the rigid conductor are hung from the connection fitting at the end of the tension insulator. The flexible conductor is supported by a lowered support member, and an outer end of the flexible conductor is connected to a retaining clamp.

[0007]

[Function] Since the rigid conductor keeps its bent shape by itself, the insulator supporting the middle part of the jumper wire may be hung from a position corresponding to the tower tower arm almost directly above the middle part of the rigid conductor. The length of the tower arm can be reduced as compared with the case where a conventional V-shaped insulator is used. The rigid conductor is light
It consists of a large amount of aluminum pipe bent and molded,
Is a lightweight, rigid and moderately flexible polymer with an FRP core
-Simple jumper device because of the insulator
Lighter, lighter, lower costs, and easier installation work
Can be Further, the bent shape of the rigid conductor is constant, and the flexible conductor may be bent in a substantially vertical plane, so that the bent shape is stable. For this reason, the shape of each jumper wire can be made substantially uniform, and the appearance is improved.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 show an embodiment of the present invention. In this jumper device for an overhead transmission line between narrow lines, the jumper wire is composed of an aluminum pipe (rigid conductor) 3a and a stranded conductor (flexible conductor) such as ACSR connected to both ends thereof.
3b.

The aluminum pipe 3a is bent so that its middle part is located on the side of the tower body 5 with a required insulation interval, and both ends are located below the tip of the tension insulator string 9. Is molded. The bent shape of the illustrated aluminum pipe 3a is such that the middle portion is a straight line extending in the line direction and both ends are bent in a direction perpendicular thereto, but the bent shape of the aluminum pipe 3a is not limited to this. is not. For example, the intermediate portion may have a shape that is curved in an arc shape.

The middle part of the aluminum pipe 3a is a tower arm 7
Of the aluminum pipe 3a is suspended from a connection fitting (a yoke or the like) 15 at the tip of the tension insulator series 9. It is supported by a rod-shaped support member 17. Thereby, the aluminum pipe 3a is kept substantially horizontal.

As the insulator 13, FRP is used to allow the aluminum pipe 3a to move in the line direction and to reduce the weight.
Use a heart-filled polymer insulator. FRP cored polymer insulators are arranged around a FRP (fiber reinforced plastic) rod, around which a polymer such as silicon rubber or EPDM (ethylene-propylene-diene terpolymer) is formed into a multi-stage insulator shape. It is molded. Since the FRP cored polymer insulator has such a structure, it has appropriate flexibility, high tensile strength, and small weight. Therefore, it is possible to follow the movement of the aluminum pipe 3a in the direction of the track, and to reduce the load applied to the tower arm 7.

The outer ends (upper ends) of the stranded conductors 3b connected to both ends of the aluminum pipe 3a are connected to an anchoring clamp 19. The stranded conductor 3b is connected to the end of the aluminum pipe 3a located below the tip of the tension insulator string 9 and to the tension insulator string 9.
Is connected to the retaining clamp 19 connected to the distal end portion thereof via the connection fitting 15 or the like, so that the bending may be performed in a substantially vertical plane, and it is easy to make the bending shape constant.

As described above, since the bent shape of the stranded conductor 3b is substantially constant and the bent shape of the aluminum pipe 3a is also constant, the shape of the entire jumper wire is stabilized, and the appearance is improved. Since the tower arm 7 only needs to have a length necessary to suspend the intermediate portion of the aluminum pipe 3a with the insulator 13, the length can be made shorter than in the conventional case.

[0014]

As explained above, according to the present invention, the length of the arm of the tower of the overhead transmission line between narrow lines can be shortened, and the tower can be downsized. Also jumper
Since the equipment can be simplified and lightened, the cost is low and
The installation work becomes easy and the polymer insulator with FRP core
The rigidity of the wire allows it to follow the rigid conductor in the line direction
It is difficult to generate excessive stress. Further, since the shape of the jumper line can be kept substantially constant, the aesthetic appearance of the jumper device can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a jumper device according to one embodiment of the present invention.

FIG. 2 is a side view of the jumper device of FIG.

FIG. 3 is a front view of the jumper device of FIG. 1;

FIG. 4 is a plan view showing a conventional overhead transmission line between narrow lines and a jumper device thereof.

FIG. 5 is a front view of the jumper device of FIG. 4;

[Explanation of symbols]

 1: Main line of overhead power transmission line 3a: Aluminum pipe (rigid conductor) 3b: Stranded conductor (flexible conductor) 5: Steel tower trunk 7: Steel tower arm 9: Tension insulator series 13: Insulator 15: Connection bracket 17: Supporting member 19: End clamp P: Tower arm attachment point of tower arm

Continuation of the front page (56) References JP-A-55-131216 (JP, A) JP-A-64-23708 (JP, A) JP-A-6-284539 (JP, A) JP-A-61-35528 (JP) , U) Japanese Utility Model Application Hei 4-38631 (JP, U) Japanese Patent Publication No. 50-19191 (JP, B1) Japanese Patent Publication No. 50-19190 (JP, B1) (58) Fields surveyed (Int. Cl. ⁶ , DB Name) H02G 7/00-7/22

Claims (1)

(57) [Claims] 1. A jumper wire comprising a rigid conductor and flexible conductors connected to both ends thereof, wherein said rigid conductor comprises a single aluminum pipe having an intermediate portion disposed laterally of a steel tower trunk. The rigid conductors are bent and molded so that they are located with the required insulation spacing and both ends are located below the tip of the tension insulator series. The middle part of this rigid conductor is attached to the tower arm with the tension insulator series. The flexible conductor is supported by a FRP cored polymer insulator suspended from the point to the tip side, and both ends of the rigid conductor are supported by a support member suspended from a connection fitting at the end portion of the tension insulator continuous tip. A jumper device for an overhead transmission line between narrow lines, the end of which is connected to an anchoring clamp.