JPH07135726A - Jumper device for short length aerial transmission line - Google Patents

Abstract

PURPOSE:To shorten the length of a steel tower arm by downwards installing an FRP interlining polymer insulator toward the tip from the mounting point of a tension insulator run and supporting the intermediate section of a jumper line so as to be positioned toward the steel-tower arm side fronter from both end sections at the lower end of the polymer insulator. CONSTITUTION:A two-FRP interlining polymer insulator 13 is mounted downwards on the side fronter than the mounting point P of the tension insulator run of a steel tower arm 7 at an interval in the line direction in a device, a support fitting 15 is set up at the lower end of the FRP interlining polymer insulator 13, and the intermediate sections of jumper lines 3 are supported. The intermediate sections of the jumper lines 3 are brought to the state in which the intermediate sections are positioned on the side of the steel tower arm 7 fronter than both end sections as viewing from an upper section, and the clearances of insulation among the intermediate sections of the jumper lines 3 and a steel tower 5 are kept. Accordingly, the mounting point of the FRP interlining polymer insulator 13 can be brought near to the root of the steel tower arm, thus shortening the length of the steel tower arm 7, then miniaturizing the steel tower.

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 a conventional overhead transmission line between narrow lines is shown in FIGS. 10 and 11. In the figure, 1 is the main line of an overhead power transmission line, 3 is a jumper line, 5 is a 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.

The V-shaped insulator 11 is constructed by combining a solid SP (station post) insulator or a suspended insulator with a V-shaped insulator. The V-shaped insulator 11 is for preventing the jumper wire 3 from rolling and moving due to its own weight.

[0005]

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. When using a suspension insulator, it is necessary to attach a weight to the lower end in order to reduce the displacement in the track direction due to the wind. The total weight of the suspension insulator and the weight is considerably large, and the tower becomes large. As a countermeasure against wind, it is preferable to use a solid SP insulator with high rigidity, but since the solid SP insulator is made of porcelain and has a small bending strength, if the tower shakes due to an earthquake, it will be destroyed by its own weight and jumper wire weight. There is a risk. In particular, when the voltage is 275 kV or more, three solid SP insulators are connected and used in series. However, at such a length, the bending strength is insufficient and it is difficult to use.

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 a tower arm.

[0007]

[Means for Solving the Problems] One means for achieving this object is to attach a polymer insulator with a FRP core downward to the tip side from the attachment point of a tension insulator insulator of a steel tower arm, and to attach the lower end of the polymer insulator with a FRP core. The intermediate portion of the jumper wire is supported so that the intermediate portion of the jumper wire is located closer to the tip end side of the steel tower arm than both ends when viewed from above (claim 1).

Another means for achieving the above object is to construct the intermediate part of the jumper wire with a rigid conductor, and attach two FRP core-filled polymer insulators downward to the tip end side from the tension insulator connection point of the steel tower arm. , The distance between the lower ends of these two FRP cored polymer insulators is made larger than the distance between the upper ends,
The rigid conductor is supported at its lower end so that the rigid conductor is located closer to the tip of the steel tower arm than both ends of the jumper wire when viewed from above (claim 2).

Still another means for achieving the above object is to provide a plurality of FRP core-filled polymer insulators on the side surface of the steel tower trunk under the steel tower arm, with the tips connected and the distance between the base ends widened. The polymer insulator is attached, and the intermediate portion of the jumper wire is supported by the tip connecting portion of the polymer insulator so that the intermediate portion of the jumper wire is located closer to the tip end side of the steel tower arm than both ends when viewed from above (claim 3). ).

[0010]

In the present invention, the FRP cored polymer insulator is used as the insulator for supporting the intermediate portion of the jumper wire under the steel tower arm. FRP cored polymer insulator is FR
A P (fiber reinforced plastic) rod is arranged at the center, and a polymer such as silicon rubber or EPDM (ethylene-propylene-diene terpolymer) is molded around the rod in a multi-tiered insulator shape. Length 3 ~
It is possible to manufacture one having a length of about 6 m. Since the FRP cored polymer insulator has such a structure, the flexural fracture strength and the tensile strength are extremely large and the weight is extremely small as compared with the solid SP insulator. The performances of the FRP cored polymer insulator of 275 kV design and the solid SP insulator are compared as follows.

[0011]

[Table 1]

Thus, the bending strength and the tensile strength are large,
Moreover, by using a lightweight FRP core-filled polymer insulator and supporting the middle part of the jumper wire with the above-mentioned configuration, the length of the steel tower arm can be shortened and the load applied to the steel tower arm is reduced. Can be miniaturized.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 9, 1 is a main line of an overhead power transmission line, 3 is a jumper wire, 5 is a steel tower trunk, 7 is a steel tower arm, 9 is a tension-resistant insulator string, 13 is a polymer insulator with FRP core, and 15 is a support metal fitting. Is.

1 to 3 show an embodiment of the invention of claim 1. In this jumper device for overhead transmission lines between narrow lines,
To the tip side from the attachment point P of the tension insulator connection of the steel tower arm 7,
Two polymer insulators 13 with FRP cores are attached downward with a space in the line direction. A support fitting 15 is attached to the lower end of the FRP core-containing polymer insulator 13, and the middle part of the jumper wire 3 is supported by the support fitting 15. In this state, the intermediate portion of the jumper wire 3 is located closer to the tip end side of the steel tower arm 7 than both ends when viewed from above (in the state of FIG. 2). As a result, the insulation distance between the intermediate portion of the jumper wire 3 and the steel tower trunk 5 is maintained.

In the case of 275 kV design with this structure, the wind speed is 4
When exposed to a wind of 0 m / sec, a polymer insulator with FRP core 1
At the bottom of 3, there is a displacement of about 57 cm. This displacement may be included in the length of the steel tower arm 7 in advance. Further, with respect to the vibration of the earthquake, the elasticity of the FRP core-containing polymer insulator 13 can absorb the vibration, and its own weight is small.
It was found that the strain generated in the cored polymer insulator 13 was small and there was no possibility of breakage.

On the other hand, FRP cored polymer insulator 1
If a solid SP insulator is used instead of 3 and the same jumper device is configured as above, destruction will not occur at a wind speed of 40 m / sec, but during an earthquake, the solid SP insulator will be 260 to 446.
It was found that a load of kg was applied and it was easily destroyed.

4 to 6 show an embodiment of the invention of claim 2. In this jumper device for overhead transmission lines between narrow lines,
The intermediate portion of the jumper wire 3 is made of a rigid conductor such as an aluminum pipe 3a. Further, two FRP cored polymer insulators 13 are attached downwardly at a distance in the line direction from the tip end side of the tension-resistant insulator consecutive attachment point P of the steel tower arm 7. The two FRP cored polymer insulators 13 are arranged such that the distance between their lower ends is larger than their upper ends, and the aluminum pipes 3a are supported substantially horizontally at their lower ends. In this state, the aluminum pipe 3a is located closer to the tip end side of the steel tower arm 7 than both ends of the jumper wire 3 when viewed from above (in the state of FIG. 5). As a result, the insulation distance between the aluminum pipe 3a and the steel tower trunk 5 is maintained.

7 to 9 show the third embodiment of the invention. In this jumper device for overhead transmission lines between narrow lines,
Two FRPs on the side of the steel tower trunk 5 under the steel tower arm 7.
A cored polymer insulator 13 is attached with its tip end connected and its base end opened in the up-down direction. A support fitting 15 is attached to the tip connecting portion of the polymer insulator 13, and the middle part of the jumper wire 3 is supported by the support fitting 15. In this state, the intermediate portion of the jumper wire 3 is located closer to the tip end side of the steel tower arm 7 than both end portions when viewed from above (in the state of FIG. 8). As a result, the insulation distance between the intermediate portion of the jumper wire 3 and the steel tower trunk 5 is maintained. This structure can minimize the length of the tower arm 7.

In the embodiments of FIGS. 7 to 9, two polymer insulators with FRP cores, the tips of which were connected to each other, were attached to the steel tower trunk with the base ends opened in the vertical direction. The two polymer insulators with FRP cores may be attached to the steel tower trunk with the base ends opened horizontally. Further, three or more FRP core-containing polymer insulators may be attached to the steel tower trunk with the ends connected and the base ends open.

[0020]

As described above, according to the present invention, a lightweight FRP cored polymer insulator supports an intermediate portion of a jumper wire, and moreover, the attachment point of the FRP cored polymer insulator is more than that of a conventional steel tower arm. Since it can be brought closer to the other side, the length of the steel tower arm can be shortened, and thereby the steel tower can be downsized.

[Brief description of drawings]

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

FIG. 2 is a plan 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 side view of a jumper device according to an embodiment of the invention of claim 2;

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

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

FIG. 7 is a side view of a jumper device according to an embodiment of the invention of claim 3;

FIG. 8 is a plan view of the jumper device shown in FIG.

9 is a front view of the jumper device of FIG. 7. FIG.

FIG. 10 is a plan view showing a conventional overhead transmission line between narrow lines and a jumper device thereof.

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

[Explanation of symbols]

1: Main line of overhead power transmission line 3: Jumper line 3a: Aluminum pipe (rigid conductor) 5: Steel tower trunk 7: Steel tower arm 9: Tension insulator insulator 13: FRP cored polymer insulator 15: Supporting metal fitting P: Steel tower arm Attachment points for tension insulators

Claims (3)

[Claims] 1. A polymer insulator with a FRP core is attached downward from a tip end side of a tension-resistant insulator connecting point of a steel tower arm,
The intermediate portion of the jumper wire is supported at the lower end of the FRP cored polymer insulator so that the intermediate portion of the jumper wire is located closer to the tip of the steel tower arm than the both ends when viewed from above. Jumper device for electric wires. 2. The intermediate portion of the jumper wire is made of a rigid conductor, and the end portion of the tower arm is 2 from the attachment point of the tension insulator connection.
The two polymer insulators with FRP cores are attached downward, and the distance between the lower ends of the two polymer insulators with FRP cores is made larger than the distance between the upper ends, and the rigid conductors are jumpered at the lower ends as seen from above. A jumper device for an overhead transmission line between narrow lines, wherein the jumper device is supported so as to be located closer to the tip end side of a steel tower arm than both ends of the line. 3. A plurality of FRP core-containing polymer insulators are attached to the side surface of the steel tower trunk below the steel tower arm in a state in which the tips are connected and the base ends are opened from the tips, and the tip connection part of the polymer insulator is provided. The jumper device for an overhead transmission line between narrow lines, characterized in that the middle part of the jumper wire is supported so that the middle part of the jumper wire is located closer to the tip of the steel tower arm than both ends when viewed from above.