JPH07135728A - Jumper device for short length aerial transmission line - Google Patents

Abstract

PURPOSE:To shorten the length of a steel tower arm while stabilizing the shape of a jumper line by supporting both end sections of a rigid conductor by support members hung down from connecting fittings at the front end sections of tension insulator runs and connecting the external ends of flexible conductors to anchor clamps. CONSTITUTION:A jumper line is composed of an aluminum pipe 3a and stranded conductors 3b connected at both ends. The intermediate section of the aluminum pipe 3a is supported by an insulator 13 suspended toward the tip from the mounting points P of the tension insulator runs of a steel tower arm 7, both end sections of the aluminum pipe 3a are supported by rod-shaped support members 17 hung down from connecting fittings 15 at the front end sections of tension insulator runs 9, and the aluminum pipe 3a is kept approximately horizontal. The external ends of the stranded conductors 3b bonded with both ends of the aluminum pipe 3a are connected to anchor clamps 19, and may be bent in an approximately vertical plane. Accordingly, the length of the arm of the steel tower of a short length the aerial transmission line can be shortened while the shape of the jumper line can be kept approximately constant.

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, narrow-line overhead power transmission lines, which require only a small land width, have been studied because of difficulty in obtaining land for overhead power transmission lines and soaring land prices. The basic configuration of an overhead transmission line between narrow lines is shown in FIGS. 4 and 5. In the figure, 1 is a main line of an overhead power transmission line, 3 is a jumper line, 5 is a steel tower trunk, 7 is a steel tower arm, 9 is a tension insulator string, and 11 is a V-shaped insulator.

That is, in the overhead transmission line between narrow lines, the tension insulator string 9 is attached near the base of the steel tower arm 7 to reduce the distance D between the adjacent main lines 1. However, in this structure, if the jumper wire 3 is arranged directly below the tension insulator string 9, the insulation distance between the jumper wire 3 and the steel tower trunk 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 under a steel tower arm 7, and a lower end of the V-shaped insulator 11 is used to see an intermediate portion of the jumper wire 3 from above. The intermediate part of 3 is supported so as to be located outside the both ends, thereby maintaining the insulation distance between the jumper wire 3 and the steel tower trunk 5.

[0004]

However, the conventional jumper device for overhead transmission lines between narrow lines has the following drawbacks. Since the V-shaped insulator whose upper end is widened in the longitudinal direction of the steel tower arm is used, the length of the steel tower arm must be increased in order to ensure a sufficient insulation distance between the jumper wire and the steel tower trunk. If the voltage exceeds 154 kV, the length of the steel tower arm becomes large, and the steel tower becomes large. Since the jumper wire is bent into a shape in which a downward descent and an outward bulge are combined, it is difficult to keep the shape of each jumper wire constant, which is not aesthetically pleasing.

In view of the above problems, an object of the present invention is to provide a jumper device for an overhead transmission line between narrow lines, which can shorten the length of the tower arm and stabilize the shape of the jumper wire. .

[0006]

In order to achieve this object, the present invention comprises a jumper wire composed of a rigid conductor and flexible conductors connected to both ends of the jumper wire, the rigid conductor having an intermediate portion. It is located on the side of the steel tower trunk with a required insulation space, and is bent and shaped so that both ends are located below the tip side of the tension insulator string, and the middle part of this rigid conductor is stretched on the steel tower arm. Outer end of the flexible conductor is supported by an insulator suspended from the attachment point of the insulator series and supported by a support member suspending both ends of the rigid conductor from the connecting metal fittings at the tip of the tension insulator series. Is connected to a detention clamp.

[0007]

[Function] Since the rigid conductor holds the bent shape by itself, the insulator supporting the intermediate portion of the jumper wire may be suspended from a position of the tower arm that is substantially above the intermediate portion of the rigid conductor. The length of the steel tower arm can be shortened as compared with the case of using the conventional V-shaped insulator. Also, the weight of the insulator can be reduced. Further, the bending shape of the rigid conductor is constant, and since the flexible conductor may be bent in a substantially vertical plane, the bending shape is stable. For this reason, the shapes of the jumper wires can be made substantially constant, and the appearance is improved.

[0008]

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

The aluminum pipe 3a is bent so that an intermediate portion thereof is located laterally of the steel tower trunk 5 with a required insulation distance and both ends thereof are located below the tip of the tension insulator string 9. It is molded. The bent shape of the aluminum pipe 3a shown in the figure is such that the middle portion is a straight line extending in the line direction and both end portions are bent at right angles 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 curved in an arc shape.

The middle part of the aluminum pipe 3a is a tower arm 7
The aluminum pipe 3a is supported by the insulator 13 suspended from the attachment point P of the tension-resistant insulator string attachment point P, and both ends of the aluminum pipe 3a are suspended from the connecting fittings (yoke, etc.) 15 at the tip of the tension-resistant insulator string 9. It is supported by a rod-shaped support member 17. As a result, the aluminum pipe 3a is kept substantially horizontal.

As the insulator 13, it is desirable to use a suspended insulator or a polymer insulator with an FRP core in order to allow the aluminum pipe 3a to move in the line direction. FRP core polymer insulator is FRP (fiber reinforced plastic)
Place the rod in the center and surround it with silicone rubber or E
PDM (ethylene-propylene-diene terpolymer)
The polymer is molded into a multi-tiered insulator shape. Since the FRP cored polymer insulator has such a structure, it has appropriate flexibility, high tensile strength, and low weight. Therefore, the movement of the aluminum pipe 3a in the track direction can be followed, and the load applied to the steel tower arm 7 can be reduced.

The outer ends (upper ends) of the stranded wire conductors 3b connected to both ends of the aluminum pipe 3a are connected to a strain clamp 19. The stranded conductor 3b is connected to the end of the aluminum pipe 3a located below the tip of the tension-resistant insulator string 9 and the tension-resistant insulator string 9.
Since the toe clamp 19 that is connected to the tip end of the through the connecting metal fitting 15 or the like is connected, it suffices to bend in a substantially vertical plane, and it is easy to make the bent shape constant.

Since the bent shape of the stranded wire conductor 3b is almost constant and the bent shape of the aluminum pipe 3a is also constant, the shape of the jumper wire as a whole is stable and the appearance is improved. Further, the steel tower arm 7 needs only have a length necessary to suspend the intermediate portion of the aluminum pipe 3a with the insulator 13, so that the length can be made shorter than in the conventional case.

[0014]

As described above, according to the present invention, the length of the arm of the steel tower of the overhead transmission line between narrow lines can be shortened, and the steel tower can be miniaturized. Further, since the shape of the jumper wire can be kept substantially constant, the appearance of the jumper device can be improved.

[Brief description of drawings]

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

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

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

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

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

[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: Tensile insulator series 13: Insulator 15: Connecting metal fitting 17: Support member 19: Stretching clamp P: Steel tower arm tension insulator connection point

Claims (1)

[Claims] 1. A jumper wire is composed of a rigid conductor and flexible conductors connected to both ends of the jumper wire, and the rigid conductor has an intermediate portion thereof laterally of a steel tower trunk with a required insulation interval. Bend molding so that both ends are located below the tip side of the tension insulator series, and the middle part of this rigid conductor is supported by the insulator suspended from the attachment point of the steel pole arm to the tip side. In addition, both ends of the rigid conductor are supported by a supporting member suspended from a connecting metal fitting at the tip of the tension-resistant insulator string, and the outer end of the flexible conductor is connected to a strain clamp. Jumper device for overhead power lines.