JPH0767236A - Lateral runout prevention device for jumper wires - Google Patents

Abstract

(57) [Summary] [Structure] The tip ends of the two polymer insulators 21A and 21B are connected by the connecting fittings 35, and the base ends thereof are connected by the rod-like member 23 to form a substantially triangular support 25. To do. Bar-shaped member 23
Fixed to the tower main landing gear 13, and two polymer insulators 21A and 21B
The jumper wire 17 beside the steel tower is supported at the tip connection part of the. [Effect] Since the middle portion of the jumper wire is supported by the two polymer insulators that form the two sides of the triangle, the lateral runout of the jumper wire can be reliably prevented. Since it is structurally simple, it is inexpensive, and because it is lightweight, it can be easily attached to a steel tower. Due to the flexibility of the polymer insulator, the jumper wire can be moved in the line direction, and the jumper wire is not subjected to excessive stress and is not damaged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing lateral vibration of jumper wires in overhead power transmission lines.

[0002]

2. Description of the Related Art When excessive jumping occurs on a jumper wire due to strong wind or the like, the jumper wire approaches a tower and causes a flashover accident. In order to prevent such an accident, it is effective to attach a jumper wire lateral vibration prevention device to the steel tower.

As a conventional jumper wire lateral run-out preventing device, an intermediate portion of the jumper wire is provided with a steel tower arm above it.
A structure having a structure in which it is connected to a steel tower arm below it with an insulator is known (Japanese Patent Publication No. 61-42486). This structure is called a tie-down system.

[0004]

In a tie-down type jumper wire lateral runout preventing device, a tower arm must be present above and below the jumper wire. In the case of a normal tension steel tower, the upper phase and middle phase jumper lines have upper and lower tower arms respectively, but the lower phase jumper wire does not have a tower arm. Therefore, in order to adopt the tie-down method, it is necessary to specially provide the fourth steel tower arm, which is disadvantageous in that the cost of lateral shake prevention measures is high.

When large amplitude vibration such as galloping occurs on the main line of the span, the jumper wire also moves in the line direction.
Since the jumper wire is constrained by the upper and lower insulators and can hardly move in the track direction, excessive stress may be applied to the insulator mounting portion of the jumper wire, resulting in fatigue damage.

In view of the above problems, an object of the present invention is that it is not necessary to provide a fourth steel tower arm, is structurally simple and inexpensive, and is free from undue stress on the jumper wire. An object of the present invention is to provide a lateral shake prevention device for jumper wires.

[0007]

In order to achieve this object, the present invention connects two polymer insulators at their distal ends and at the same time connects their base ends to both ends of one rod-shaped member.
The polymer insulator and one rod-shaped member constitute a substantially triangular support, the rod-shaped member is fixed to the steel tower, and a jumper wire located beside the steel tower at the tip connecting portion of the two polymer insulators. Alternatively, a jumper spacer may be supported (Claim 1), or the tip ends of two polymer insulators may be connected, and the base end portions may be fixed to the steel tower at a distance larger than the tip end portions to form two polymer insulators. A part of the steel tower constitutes a substantially triangular support, and a jumper wire or a jumper spacer located next to the steel tower is supported by the tip connecting portion of the two polymer insulators (claim 2). .

[0008]

According to the above construction, the jumper wire is supported by the two polymer insulators whose two ends are connected to each other to form the two sides of the triangle. Therefore, even if a strong cross wind is applied, the jumper wire can be surely deflected laterally. It can be prevented. Further, the structure is simple, and the fourth steel tower arm is not required, so that the cost is low.

Further, the polymer insulator is composed of a FRP rod as a central core material, and a polymer (silicon rubber or ethylene propylene rubber etc.) is molded around the FRP rod in a multi-stage umbrella shape. Moreover, it has some flexibility. Therefore, even if the jumper wire is supported by the two polymer insulators, the flexibility of the polymer insulator allows the jumper wire to move to some extent in the line direction. Therefore, even if galloping or the like occurs on the main line, the jumper wire moves in the direction of the line, so that it is difficult to apply unreasonable stress to the jumper wire.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 3 show a first embodiment of the present invention. In the figure, 11 is a tension-resistant steel tower, 13 is a main landing gear of the steel tower 11,
Reference numeral 15 is an arm of the steel tower 11, 17 is a jumper wire, and 19 is a jumper spacer.

This jumper wire lateral runout preventer is provided with a substantially triangular support 25 composed of two polymer insulators 21A and 21B and one rod-like member 23.
It supports the middle part of 17. Polymer insulator 21A,
As shown in FIG. 2, 21B has a FRP rod 27 as a central core material, around which a polymer 29 such as silicon rubber or ethylene propylene rubber is molded in a multi-stage umbrella shape, and an eye metal fitting 31 is provided at the tip end and a base end portion. The flange metal fitting 33 is integrally attached to the structure.

A vertically extending connecting fitting 35 is fixed to a jumper spacer 19 located beside the steel tower main leg 13. The connecting fitting 35 has clevis fittings 37 at both ends. The eye fitting 31 at the tip of the polymer insulator 21A, 21B is
The clevis fitting 37 is connected by bolts and nuts. As a result, the tip ends of the two polymer insulators 21A and 21B are connected by the connecting fitting 35.

The flange metal fittings 33 at the base end portions of the two polymer insulators 21A and 21B are connected to both ends of a rod member 23 made of steel or the like by bolts and nuts. Bar-shaped member
The length of 23 is sufficiently longer than the connecting fitting 35. Therefore, the distance between the two polymer insulators 21A and 21B becomes larger at the base end portion than at the tip end portion, and the polymer insulators 21A and 21B and the rod-shaped member 23 constitute a strong support 25 having a substantially triangular shape.

The rod-shaped member 23 is fixed to the steel tower main landing gear 13 by the fixing metal fitting 39.
Fixed to. The tip end connecting portions of the polymer insulators 21A and 21B support the jumper spacer 19. As a result, the intermediate portion of the jumper wire 17 is firmly supported by the two polymer insulators 21A and 21B forming the two sides of the triangle, and it is possible to reliably prevent large lateral shake due to strong wind.

Further, the polymer insulators 21A and 21B have a certain degree of flexibility, and both of them are located in a substantially vertical plane including the steel tower main landing gear 13, so that the jumper wire 17 in The movement can be followed by the bending of the polymer insulators 21A and 21B. Therefore, even when galloping occurs on the main line, it is difficult for an excessive stress to act on the support portion of the jumper wire 17, and fatigue damage to the jumper wire 17 can be prevented.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a front view corresponding to FIG. 2 of the first embodiment. This embodiment is largely different from the first embodiment in that the base end portions of the two polymer insulators 21A and 21B are individually attached to the steel tower main landing gear 13 without using the rod member 23 in FIG. The polymer insulators 23A and 23B of the book and a part of the tower main leg 13 constitute a substantially triangular support 25.

Specifically, two polymer insulators 21A and 21A are used.
B has a base end formed of an eye fitting 41, and the clevis fitting 45 of the mounting member 43 is connected to each of the eye fittings 41 by bolts and nuts. The structure is fixed to.

In this way, the inclination angle of the two polymer insulators 21A and 21B can be changed by changing the mounting distance D of the mounting member 43 to the steel tower main landing gear 13, so that the steel tower 11
The change in the insulation distance L between the jumper wire 17 and the jumper wire 17 can be easily accommodated. Since other configurations are the same as those in the first embodiment,
The same parts are designated by the same reference numerals and the description thereof will be omitted.

Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a plan view corresponding to FIG. 3 of the first embodiment. The front view is the same as FIG. 2 of the first embodiment.
In this embodiment, two support towers 13 on each side are provided with support members.
25 is fixed, and one-phase jumper wire 17 is supported by two sets of supports 25. Since other configurations are similar to those of the first embodiment, the same parts are designated by the same reference numerals. This anti-shake device is suitable for large jumper wires,
A small and lightweight polymer insulator can handle a large external force.

Next, FIG. 6 shows a fourth embodiment of the present invention.
This embodiment is an example in which the present invention is applied to a single conductor jumper wire. In this case, the eye metal fittings 27 at the tips of the polymer insulators 21A and 21B are connected by a connecting metal fitting 47, and a clamp 49 attached to the connecting metal fitting 47 holds the jumper wire 17. Other configurations are similar to those of the first embodiment, and therefore, the same parts as those in FIG. 2 are designated by the same reference numerals.

Next, FIG. 7 shows a fifth embodiment of the present invention.
This embodiment is an example in which the present invention is applied to a single conductor jumper wire, but in this case, two polymer insulators 21A and 21B are used.
Are arranged horizontally. That is, the base end portions of the two polymer insulators 21A and 21B are separately fixed to the two steel tower main legs 13, and the tip portions thereof are connected by the connecting metal fittings 47, and
The structure is such that the clamp 49 attached to the gripper holds the jumper wire 17.

[0022]

As described above, according to the present invention, since the middle portion of the jumper wire is supported by the two polymer insulators forming the two sides of the triangle, the lateral runout of the jumper wire can be reliably prevented. You can Further, the structure is simple, so the cost is low, and since it is lightweight, it can be easily attached to a steel tower. In addition, the flexibility of the polymer insulator allows the jumper wire to move in the direction of the track, so that it is difficult for undue stress to act on the jumper wire and there is less risk of damaging the jumper wire.

[Brief description of drawings]

FIG. 1 is a front view showing a steel tower to which a jumper wire lateral shake preventing device according to a first embodiment of the present invention is attached.

FIG. 2 is a front view of the jumper wire lateral shake preventing device in FIG.

3 is a plan view of the jumper wire lateral shake preventing device in FIG. 1. FIG.

FIG. 4 is a front view showing a second embodiment of the present invention.

FIG. 5 is a plan view showing a third embodiment of the present invention.

FIG. 6 is a front view showing a fourth embodiment of the present invention.

FIG. 7 is a plan view showing a fifth embodiment of the present invention.

[Explanation of symbols]

11: Tensile steel tower 13: Steel tower main leg 15: Steel tower arm 17: Jumper wire 19: Jumper spacer 21A, 21B: Polymer insulator 23: Rod-like member 25: Triangular support 35: Connecting metal fitting 39: Fixing metal fitting 43: Mounting Metal fittings

Claims (2)

[Claims] 1. Two polymer insulators are connected to each other at their distal end portions, and their base end portions are connected to both ends of one rod-shaped member, so that the two polymer insulators and one rod-shaped member have a substantially triangular shape. Of the support member, and fixing the rod-shaped member to the steel tower,
A jumper wire lateral runout preventing device, characterized in that a jumper wire or a jumper spacer located beside a steel tower is supported at a tip connecting portion of two polymer insulators. 2. The two polymer insulators are connected to each other at their distal end portions, and the base end portions thereof are fixed to the steel tower at intervals larger than those of the front end portions so that the two polymer insulators and a part of the steel tower have a substantially triangular shape. A jumper wire lateral runout preventing device, comprising a support body, which supports a jumper wire or a jumper spacer located beside a steel tower at a tip connecting portion of two polymer insulators.