JPS6123603B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an overhead electric wire having hydrophilic properties and a method for manufacturing the same.

Generally, overhead electric wires are made of metal wires twisted together.
If this is constructed, when it rains,
Rainwater adheres to the surface of the wire in a spherical shape. Therefore, when a high voltage is applied to the overhead wires, corona discharge occurs from the spherical rainwater, which generates noise.

As an overhead electric wire that suppresses such corona discharge, one is known in which the surface of the electric wire is made hydrophilic and the wettability is improved so that the attached rainwater does not become spherical.

Conventionally, as a means to provide this hydrophilicity,
A method of imparting hydrophilic properties by sandblasting, boehmite treatment, or alkaline aqueous solution treatment on the surface of an electric wire to provide a large number of recesses on the surface of the electric wire has been widely adopted.

However, both methods had little effect on making the material hydrophilic, and therefore had little effect on inhibiting corona discharge.

On the other hand, in order to improve hydrophilicity, it is possible to combine the above-mentioned sandblasting treatment with boehmite treatment or surface treatment with an alkaline aqueous solution to obtain a composite effect, but this would require two Ikioi treatment steps, which would be cumbersome. Not only that, but it also has the disadvantage of being inferior in economic efficiency.

The present invention provides a hydrophilic overhead wire and a method for manufacturing the same, which improves on these drawbacks.

Next, the hydrophilic overhead wire according to the present invention will be explained based on FIG.

The figure shows a case in which the present invention is applied to a steel-core aluminum stranded wire that is wrapped with aluminum armor rods at predetermined intervals to prevent wind noise and snow accumulation.

In the figure, 1 is a steel core, 2 is an aluminum stranded wire layer twisted on the steel core 1, and 3 is an armor rod spirally wound on the aluminum strands 2 at predetermined intervals.

Reference numeral 4 indicates a recess provided on the surface of the outermost aluminum stranded wire layer 2 and the surface of the aluminum armor rod 3.

This recess 4 has the same size as the conventional one, for example.
The size is about 10 microns.

5 is the outermost aluminum stranded wire layer 2 provided with a recess 4
Indicates metal powder, such as iron powder, which is oxidized by moisture adhering to the surface and the surface of the armor rod 3.

The size of the metal powder 5 is, for example, 10 microns or less.

It should be noted that the overhead wire may not only be of other types, but also one that does not include the armor rod 3.

Furthermore, as a method for forming the recess 4 and attaching the metal powder 5, any method can be used such as spraying an adhesive onto the surface of the overhead electric wire that has been subjected to sandblasting treatment, and then spraying the metal powder thereon. Although construction can be carried out before or after erection, the following manufacturing method according to the present invention can be adopted.

The method for manufacturing the hydrophilic overhead wire of the present invention will be described below.

In the figure, 6 indicates a steel core aluminum stranded wire.

The steel-core aluminum stranded wire 6 has an armor rod 3 wound around its outer periphery in a spiral manner at predetermined intervals.

The steel-core aluminum stranded wire 6 thus constructed is introduced into a shot device 7 equipped with a plurality of shot guns 8, and a shot material is shot onto the surface of the outermost aluminum stranded wire layer. A recess is provided.

In this case, a part of the shot material is attached to the surface of the aluminum stranded wire layer by the shot, thereby forming a hydrophilic overhead wire as shown in FIG.

Shot materials include metals that have a hardness greater than that of the outermost layer of aluminum and that oxidizes with moisture;
For example, use iron.

Note that even under normal shot conditions, depressions are formed on the surface of the aluminum stranded wire layer, and part of the shot material adheres to the surface of the aluminum stranded wire layer. and apply this to normal pressure
It is desirable to shoot at a pressure of about 130% so that the shot material bites into the surface of the aluminum stranded wire layer and a portion of it remains on the surface of the aluminum stranded wire layer.

Furthermore, not only may other overhead wires be used, but the armor rod 3 may not be provided.

Furthermore, the shot treatment described above may be performed before or after erection.

However, according to the hydrophilic overhead wire of the present invention, since the surface has many recesses and metal powder that is oxidized by moisture is attached, when it is installed, the metal powder is oxidized by rainwater and the wire surface becomes porous. Since it is covered with oxide, the hydrophilicity increases significantly in conjunction with the recesses.

Furthermore, according to the method of the present invention, a shot material made of a metal that is oxidized by moisture is shot on the surface of the overhead wire layer so that a part of the shot material adheres to the surface of the wire, thereby providing a large number of recesses. The treatment process is only one step, and is much simpler and more economical than conventional methods.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of the hydrophilic overhead electric wire of the present invention, and FIG. 2 is an explanatory diagram illustrating a method for manufacturing the hydrophilic overhead electric wire of the present invention. DESCRIPTION OF SYMBOLS 1... Steel core, 2... Aluminum stranded wire layer, 3... Armor rod, 4... Recess, 5... Metal powder, 6...
...Steel core aluminum stranded wire, 7...Shot device.

Claims (1)

[Claims] 1. An overhead electric wire made of twisted metal wires,
1. A hydrophilic overhead electric wire characterized in that the surface of the electric wire is provided with a large number of recesses and metal powder that is oxidized by moisture is attached. 2. On the surface of an overhead wire made of twisted metal wires, shot material made of a metal that is oxidized by moisture is shot so that a part of the shot material adheres to the surface of the wire in the form of powder, thereby creating many recesses. A method for producing a hydrophilic electric wire, comprising: providing a hydrophilic electric wire;