JPS5837924B2 - overhead power lines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an overhead power transmission line in which the surface of the outer stranded wire layer is subjected to hydrophilic treatment, particularly roughening treatment, to prevent the generation of corona during rain.

In general, when it rains, rainwater forms water balls on the surface of the wires and forms corona particles on the installed overhead power transmission lines.

? Since then, as a means to prevent the generation of corona, the surface of the outer stranded wire layer of electric wires has been treated to make it hydrophilic, for example, the surface of the outer layer aluminum strands of steel-core aluminum stranded wires has been chemically treated to form an aluminum hydroxide film on the surface. Methods to prevent water balls from forming on the surface of electric wires even when it rains have been widely adopted, such as by roughening the surface of the aluminum wire by sand blasting or the like.

According to experiments, among the above methods, the method in which the wire surface is roughened has the greatest corona prevention function.

However, since the surface of the outer stranded wire layer of an overhead power transmission line configured in this manner is roughened, it is possible to prevent the occurrence of corona during rain, but on the other hand, the surface of the outer stranded wire layer is roughened. Therefore, the frictional resistance on the surface is high.

Therefore, when this electric wire is extended, friction occurs between the surface of the electric wire and a metal wheel, etc., causing problems such as the electric wire becoming loose.

The present invention improves these drawbacks.

This will be explained based on an embodiment shown in FIG.

In the diagram, 1 indicates an overhead power transmission line, such as a steel-core aluminum stranded wire, and 2
This figure shows an outer stranded wire layer of the steel-core aluminum stranded wire, and the outer surface of this outer stranded wire layer 2 has been subjected to a roughening treatment 3 as shown in FIG.

As the surface roughening treatment, any method such as sandblasting the surface or polymerization treatment with boehmite treatment may be employed.

1, a water-soluble lubricant 4 is applied to the top surface of the roughened surface as shown in FIG.

As this water-soluble lubricant, the following can be employed.

■ Mineral oil, oil or wax with 10 moles or more of ethylene oxide added.

■ Mineral oil, oil or wax with one or more nonionic, anionic or cationic surfactants? A mixture of two or more types.

■ ■ and ■ are dissolved in their aqueous solutions or organic solvents.

1. In addition, the above-mentioned method for surface roughening treatment and application of a water-soluble lubricant involves subjecting the aluminum wires constituting the outer twisted wire layer to a treatment liquid or a lubricant solution before the wire stranding process. Any method can be adopted, such as a method in which the wires are passed through the wire and subjected to an IT-twisting process to form an outer twisted wire layer, or a method in which the surface of the wire is subjected to such treatment after the wire-twisting process.

1. It is not necessary that the roughened surface and the lubricant-applied surface match perfectly, and it is fine for either of them to have a large area, but at least both are completed as shown in Figure 2. It is necessary to apply this to the outermost circumference of the wire.

Furthermore, the present invention can be applied to overhead power transmission lines other than steel core aluminum stranded wires.

However, according to the present invention, the outer surface of the outer stranded wire layer of the electric wire is laminated with a roughened surface and a surface coated with a water-soluble lubricant. The frictional resistance is reduced by the lubricant, and therefore the frictional resistance between the electric wire and the metal wheel etc. is lowered, and the electric wire will not be damaged.

Moreover, since the surface to which the water-soluble lubricant is applied is roughened, the water-soluble lubricant (which has a low viscosity) penetrates deep into the roughened surface due to capillary action, making it difficult to Will not fall off.

Therefore, the lubricant does not leak out during the installation of the overhead power transmission line of the present invention, and not only can the wires be prevented from collapsing during the installation, but also the line installation work can be carried out smoothly. I can.

1) Since the lubricant is water-soluble, it melts and flows out during rain, exposing the roughened surface, which prevents rainwater from adhering to the surface of the wire in the form of spheres. It is possible to prevent the occurrence of corona during rain and achieve the intended purpose.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram illustrating an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of the main part of FIG. 1...Overhead power transmission line, 2...Outer twisted wire layer, 3...Roughening treatment, 4...Water-soluble lubricant.

Claims (1)

[Claims] 1. An overhead power transmission line in which the surface of the outer stranded wire layer is roughened and a water-soluble lubricant is applied to the roughened surface.