JP2906389B2 - 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]

SUMMARY OF THE INVENTION To achieve this object the present invention, the tower trunk below the tower arm, the side, FRP heart filled poly to protrude in three directions of the front and rear
Attach the insulators and attach one
The Rumipaipu on the side of the intermediate portion towers trunk, to support the bent molded rigid conductors as both end portions located forward and rearward of the towers trunk, located under the tension insulator strings that rigid conductors The connecting portion and the retaining clamp are connected by a slackened flexible conductor.

[0007]

In this jumper device, a jumper wire is formed by the rigid conductor and the flexible conductor. The rigid conductor is fixed to the tower body by insulators projecting in three directions from the tower body. Therefore, it is not necessary for the tower arm to support the middle part of the jumper wire (the middle part of the rigid conductor), and it is sufficient that the tower arm has the length necessary to support the tension insulator series of the narrow line overhead transmission line. Become. Therefore, the length of the tower arm can be greatly reduced as compared with the case where the conventional V-shaped insulator is used. Ma
Rigid conductor is made by bending a lightweight aluminum pipe
The insulator is made of lightweight, rigid and flexible FRP core
Jumper device because it is made of polymer insulator
Simplification, weight reduction, cost reduction, easy installation work
Can be achieved. In addition, rigid conductors are fixedly supported by insulators
FRP cored polymer insulator is flexible
High strength against earthquakes and mains vibration.
You. 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 appearance of the jumper device 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) 3b such as ACSR connected near both ends thereof. .

The aluminum pipe 3a maintains a required insulation interval between the aluminum pipe 3 and the tower main body 5, and has an intermediate portion located on the side of the tower main body 5 and both ends located in front and rear of the tower main body 5. It is bent. 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. Instead, the shape may be, for example, an arc.

[0010] tower trunk 5 under the tower arm 7 has its side, are insulators 13a a rigid so as to project the three sides of the front and rear, 13b, 13c are mounted.
As the insulators 13a to 13c, polymer insulators containing an FRP core are used.
Use

[0011] The FRP cored polymer insulator is arranged with a FRP (fiber reinforced plastic) rod at the center, around which silicone rubber or EPDM (ethylene-propylene-
It is formed by molding a polymer such as a diene terpolymer into a multi-stage insulator shape. Since the FRP cored polymer insulator has such a structure, it has moderate rigidity and flexibility, and is small in weight.

The bent and formed aluminum pipe 3a is supported by the tips of the insulators 13a to 13c. Thereby, the aluminum pipe 3a is attached to the tower main body 7 in a substantially horizontal state. Naturally, the length of the insulators 13a to 13c should be such that the insulation interval between the tower body 7 and the aluminum pipe 3a can be maintained.

The stranded conductor 3 is provided between a portion of the aluminum pipe 3a located under the tension insulator string 9 and the anchoring clamp 15.
b. The stranded conductor 3b has slack as shown in FIG. 2, and the slack absorbs the movement on the main line 1 side. The stranded conductor 3b is located below the tension insulator string 9 of the aluminum pipe 3a,
End clamp 1 connected to the tip of tension insulator series 9
5 is connected, it is only necessary to bend in a substantially vertical plane, and it is easy to make the bent 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 has only to have a length necessary to retain the tension insulator string 9 of the overhead transmission line between narrow lines, the length can be made shorter than before.

[0015]

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
High strength against earthquakes and mains vibrations due to the flexibility of the child
it can. Further, since the shapes of the rigid conductor and the jumper wire 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 insulator 13: Insulator 15: End clamp

Continuation of the front page (56) References JP-A-64-23708 (JP, A) JP-A-6-276652 (JP, A) JP-A-4-38631 (JP, U) JP-B-36-8377 (JP) , B1) JP 50-19191 (JP, B1) JP 50-19190 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02G 7/00-7/22

Claims (1)

(57) [Claims] Claims: 1. A tower trunk under a tower arm, on its side,
FRP mind entering port so as to project to the front and a three-way backward
Rim insulators are attached and rigid conductors are formed by bending one aluminum pipe at the tip of the insulator so that the middle part is located on the side of the tower body and both ends are located in front of and behind the tower body. And a connection between a portion of the rigid conductor located under the tension insulator series and the retaining clamp is connected by a slackened flexible conductor. Jumper device.