JPH09322369A - Low noise aerial transmission line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To firmly fix the terminal of a wind sound preventive spiral rod and completely prevent the slip out of the terminal by winding a rigid metallic wire spiral rod for slip out prevention around the terminal of the wound wind sound preventive spiral rod. SOLUTION: To begin with, short wind sound preventive spiral rods 2-1 and 2-2 preformed in advance in a factory are prepared, and those are coupled and wound in order around the established aerial transmission line 1. Then, a rigid metallic wire spiral rod 3 for slip out prevention preformed in advance in a factory is wound around the wind sound preventive spiral rod winding wrap connection 4 between the wind sound preventive spiral rods 2-1 and 2-2 wound that way. The terminal fixing force of the wound wind sound preventive spiral rods 2-1 and 2-2 goes higher remarkably than the fixing force of the terminal, as a result, the low-noise aerial transmission line 1 completely dissolves the fear of the slip out of the terminal of the wind sound preventive spiral rods 2-1 and 2-2 even if it suffers a short circuit accident.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low noise overhead power transmission line. More specifically, the present invention relates to a low noise overhead power transmission line obtained by improving a method of fixing a terminal portion of a wind noise-preventing spiral rod wound around an outer circumference of the overhead power transmission line to prevent wind noise generated in the overhead power transmission line. It is a thing.

[0002]

2. Description of the Related Art Overhead power transmission lines sometimes generate a specific wind noise by receiving wind.

Naturally, it is strongly demanded that such wind noise of the overhead power transmission line be reduced as an environmental problem.

A method of winding a wind noise preventing spiral rod around the outer circumference of an existing overhead power transmission line is known as an effective method for reducing wind noise of the overhead power transmission line.

Here, the wind noise preventing spiral rod is formed by preforming a metal wire into a short spiral rod shape at the time of factory production.

The wind noise-preventing spiral rod thus preformed is transported to the installation location of the existing overhead transmission line, and then wound around the outer circumference of the existing overhead transmission line.

Conventionally, the end portion of the wind noise prevention spiral rod wound around the outer circumference of the existing overhead power transmission line is pre-installed so that the wind noise prevention spiral rod itself can be fixed around the outer circumference of the existing overhead power transmission line at the time of factory production. Since it is a form, I did not add any special fixing work.

Further, regarding the lap portion which is a joint portion of the wind noise preventing spiral rod, the wind noise preventing spiral rod is pressed and attached so as not to loosen, and the length of the lap portion is about 50 mm. It was being constructed.

By the way, when a short circuit accident occurs in the overhead power transmission line, especially in the multi-conductor overhead power transmission line, a phenomenon occurs in which adjacent electric wires attract each other by electromagnetic force.

When such a short-circuit accident occurs, the wire portion sandwiched between the wire anchorage point, which is the fixed point of the multi-conductor overhead power transmission line, and the spacer attachment point (this sandwiched wire portion is called a sub span). Then, a phenomenon occurs in which the electric wire is adsorbed in the longitudinal direction from the central portion of the sandwiched electric wire portion toward the electric wire anchoring point, which is a fixed point, and the spacer attachment point, and thereby the electric wires collide with each other.

This collision force is considerably large, and when it is severe, there is a concern that the end portion of the wind noise prevention spiral rod wound around the outer periphery of the multiconductor overhead transmission line may come off due to the collision impact force.

That is, since the end portion of the wind noise prevention spiral rod wound around the outer circumference of the conventional existing overhead power transmission line is simply attached in the direction in which the strands of the wind noise prevention spiral rod do not loosen, the fixing force is not increased. As a result, there was a concern that the terminal portion of the wind noise prevention spiral rod, which had been wound around the outer circumference of the existing overhead power transmission line, would come off due to the collision impact force between the electric wires when a short circuit or the like occurred.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in view of such a point, and the purpose thereof is to solve the above-mentioned drawbacks of the prior art and to wind it around the outer circumference of an overhead power transmission line. Provided is a low noise overhead power transmission line capable of firmly fixing the end portion of the wind noise prevention spiral rod, thereby completely preventing the wind noise prevention spiral rod from coming off the end portion even if a short circuit accident occurs. Especially.

[0014]

The gist of the present invention resides in that a plurality of short wind noise preventing spiral rods are sequentially wound along a longitudinal direction of a long overhead transmission line so as to be connected to each other. In a noise overhead power transmission line, there is provided a low noise overhead power transmission line characterized in that a rigid metal wire spiral rod for preventing disengagement is wound around an outer periphery of a terminal portion of a wind noise prevention spiral rod wound around.

In the present invention, the detachment-preventing rigid metal wire spiral rod is preformed into a coil shape at the factory.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a low noise overhead power transmission line of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a plan view showing an embodiment of the low noise overhead power transmission line of the present invention.

In FIG. 1, 1 is an overhead transmission line, 2-1, 2
Reference numeral -2 is a wind noise preventing spiral rod, 3 is a rigid metal wire spiral rod for preventing disengagement according to the features of the present invention, and 4 is a wind noise preventing spiral rod wrap connection portion.

FIG. 2 is an enlarged plan view of the detachment-preventing rigid metal wire spiral rod 3 according to the features of the present invention.

That is, in one embodiment of the end portion of the wind noise prevention spiral rod of the present invention shown in FIG. 1, first, a short wind noise prevention spiral rod 2 which is preformed in advance in a factory is used.
1, 2-2, 2-3 (not shown), 2-4 (not shown), 2-N (not shown) are prepared, and they are attached to the outer circumference of the existing overhead transmission line 1. Connect them in sequence and wind them.

At this time, in the connecting portion 4 of the short wind noise preventing spiral rods 2-1 and 2-2, the end portions of the wind noise preventing spiral rods 2-1 and 2-2 wrap over a length of 5 mm. It is wound around the outer circumference of the existing overhead transmission line 1 so that

Similarly, the wind noise preventive spiral rod winding wrap connecting portion 4 is also applied to 2-3 (not shown), 2-4 (not shown), ..., 2-N (not shown). The same is done.

Then, the wind noise preventing spiral rods 2-1 and 2-2 thus wound around the wind noise preventing spiral rod wrap connection portion 4 have an outer periphery shown in FIG. The rigid metal wire spiral rod 3 for preventing disengagement shown is wound.

The strands of the rigid metal wire spiral rod 3 for preventing detachment are the wind noise preventing spiral rods 2-1 and 2-2.
Use a metal wire that has greater rigidity than the wire used in.

(Embodiment 2) FIG. 3 is a plan view showing another embodiment of the low noise overhead power transmission line of the present invention.

In FIG. 3, 1 is an overhead power transmission line, 2 is a wind noise prevention spiral rod, 3 is a rigid metal wire spiral rod for preventing disconnection according to the features of the present invention, and 5 is a winding terminal portion of the wind noise prevention spiral rod 2. Is.

That is, in another embodiment of the low noise overhead power transmission line of the present invention, the winding end portion 5 of the wind noise prevention spiral rod 2 is used.
A rigid metal wire spiral rod 3 for preventing disengagement is wound around the outer periphery of the wind noise preventing spiral rod 2 so that the position is at the center of the connecting portion.

(Collision Impact Test) In the low noise overhead power transmission lines of Examples 1 and 2 obtained as described above, the terminal fixing force of the wind noise prevention spiral rod 2 is the wind in the conventional low noise overhead power transmission line. It was 1.6 times or more the fixing force at the end of the sound-proof spiral rod 2. As a result, even if a short-circuit accident occurs in a low-noise overhead power transmission line, it is possible to completely eliminate the concern that the wind noise-preventing spiral rod will come out of the end, thereby reducing the reliability of the overhead noise of the overhead power transmission line. It is possible to improve the property.

[0029]

According to the low noise overhead power transmission line of the present invention, the end portion fixing force of the wind noise prevention spiral rod wound around it is more remarkable than the wind noise preventing spiral rod end portion fixing force in the conventional low noise overhead power transmission line. As a result, the low-noise overhead power transmission line can completely eliminate the concern that the wind noise-preventing spiral rod will come off the terminal portion even if a short-circuit accident occurs, and is industrially useful.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a low noise overhead power transmission line of the present invention.

FIG. 2 is an enlarged plan view of a rigid metal wire spiral rod for preventing detachment according to a feature of the present invention.

FIG. 3 is a plan view showing another embodiment of the low noise overhead power transmission line of the present invention.

[Explanation of symbols]

 1 Overhead transmission line 2, 2-1, 2-2 Wind noise prevention spiral rod 3 Rigid metal wire spiral rod for prevention of disconnection 4 Wind noise prevention spiral rod winding wrap connection 5 Wind noise prevention spiral rod winding terminal

Claims (1)

[Claims] 1. A low noise overhead power transmission line formed by sequentially winding a plurality of short length wind noise-preventing spiral rods along a longitudinal direction of a long overhead power transmission line. A low noise overhead power transmission line characterized in that a rigid metal wire spiral rod for preventing disconnection is wound around the outer periphery of the terminal portion.