JP2009289705A - Steel core aluminum stranded wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an overhead open power transmission line for clearly confirming a steel wire exposed in a melting damage part by visual observation, when a part of an aluminum wire of a surface layer is damaged by melting by a short-circuit accident etc, in a steel core aluminum stranded wire formed by integrally winding the aluminum wire on the outer periphery of the steel wire to cover it. <P>SOLUTION: This steel core aluminum stranded wire is composed of the steel wire 2 and the aluminum wire 10 integrally wound on the outer periphery of the steel wire to cover it by intertwining in a layer shape. A color of both is made different by forming a coloring layer on at least one outside surface of the steel wire and the aluminum wire. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an improvement in a steel core aluminum wire widely used as an overhead power transmission bare wire.

Steel core aluminum strands are widely used in power transmission and distribution facilities, with steel wires for increasing mechanical strength and aluminum wires as the main conductor that is wound around and integrated with the layers around the steel wires. ing.
When a large amount of snow adheres to and accumulates on the steel core aluminum wire used as an overhead power transmission line, the steel core aluminum wire bends downward and deforms due to the weight of the snow, but when the accumulated snow falls, the reaction moves upward. Jump to. At this time, when a short-circuit accident occurs due to contact with another overhead power transmission line located above, the wire breakage due to melting occurs in both power transmission lines. The range of melting damage occurs in the form of dots over the range of several centimeters to several meters, but even if the aluminum wire on the surface layer is broken due to melting damage, it is the same color (silver) as the inner steel wire Even if observed with binoculars from the ground surface 30 to 40 m away, it was extremely difficult to confirm the presence or absence of melting damage. Such a melting accident also occurs by lightning strike.

Japanese Patent Application Laid-Open No. 2001-143533 discloses an aerial bare electric wire composed of a steel strand for ensuring tensile strength and an aluminum strand wound around the outer circumference of the steel strand, and at least one aluminum strand. Is composed of a colored layer formed on the outer periphery of the core wire and a metal coating layer formed on the outer periphery of the colored layer. According to this, when corrosion occurs in the electric wire and even a part of the metal coating layer on the surface disappears, the colored layer located inside the disappearing portion is exposed, so that the presence of corrosion can be visually confirmed. .
However, this conventional example is premised on the disappearance of the metal coating layer due to corrosion, and when the aluminum wire itself having the colored layer melts and disappears due to a short circuit or lightning stroke, the colored layer does not exist, so the early stage It is difficult to find the melted part.
JP 2001-143533 A

As described above, the conventional steel core aluminum wire has the same color as the inner steel core and the aluminum wire on the surface layer. When the heart was exposed, it was difficult to detect this melted part even if it was confirmed using a telescope or approached by a helicopter.
The present invention has been made in view of the above, and in a steel core aluminum wire in which an aluminum wire is wound around and integrated with the outer periphery of a steel wire, a part of the surface aluminum wire is melted due to a short circuit accident or the like. An object of the present invention is to provide an overhead bare power transmission line that can clearly check a steel wire exposed in a damaged portion by visual observation.

In order to achieve the above object, a steel core aluminum stranded wire according to the invention of claim 1 is a steel core aluminum comprising a steel wire and an aluminum wire which is wound around and integrated with the outer periphery of the steel wire in a layered manner. A color layer is formed on the outer surface of at least one of the steel wire and the aluminum wire, and the colors of both are made different.
When a part of the aluminum wire is melted down due to a short circuit accident, lightning strike, etc., the outer surface of the steel wire, which has a different color from the aluminum wire, is exposed from the melted part, so that the observer from the ground surface or helicopter can easily It is possible to know the presence or absence of erosion and the extent of erosion at an early stage.
The steel core aluminum stranded wire according to the invention of claim 2 is characterized in that it is made different from the color of the aluminum wire by forming the colored layer on the steel wire.
Although a colored layer may be provided on the aluminum wire side, the disadvantage is reduced when the colored layer is provided on the steel wire.
According to a third aspect of the present invention, there is provided a steel core aluminum stranded wire according to the second aspect, wherein the colored layer is made of a paint having corrosion resistance.
The steel wire is usually plated to prevent corrosion, but the corrosion resistance can be improved by using a material having corrosion resistance as a coating material constituting the colored layer.

  According to the present invention, in a steel core aluminum wire composed of a steel wire and an aluminum wire that is wound around and integrated with the outer periphery of the steel wire in a layered manner, the outer surface of at least one of the steel wire and the aluminum wire is colored. Since the two colors were made different by forming a layer, when a part of the aluminum wire on the surface layer was melted due to a short circuit accident or the like, the steel wire exposed in the melted part can be clearly confirmed visually. .

Hereinafter, the overhead bare power transmission line according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of an overhead bare power transmission line according to an embodiment of the present invention, FIG. 2 (a) is a cross-sectional view showing a state where an aluminum wire is melted, and FIG. FIG.
The steel core aluminum stranded wire 1 includes a steel wire (steel stranded wire) 2 for increasing mechanical strength, and an aluminum wire 10 as a main conductor that is wound and integrated around the steel wire 2 in a layered manner. I have.
The characteristic configuration of the present invention is that a colored layer is formed on at least one of the steel wire 2 and the aluminum wire 10 so that both colors are different, and thus the aluminum wire 10 is partially melted due to a short circuit accident or the like. In this case, based on the color difference between the color of the outer surface of the steel wire 2 exposed from the melted spot 11 and the color of the non-fused spot 12 outside the melted spot 11, the presence and range of the melted spot can be confirmed. It is in the point which did.
Originally, both the galvanized steel wire 2 and the bare aluminum wire 10 are almost silver, so even if a part of the aluminum wire is melted and the steel wire 2 is exposed, visual observation from the ground However, in the present invention, the color of the colored layer 3 of the steel wire 2 and the color of the aluminum wire 10 are clearly different. It becomes easy to confirm.

In the present embodiment, in order to make the colors of the steel wire 2 and the aluminum wire 10 different, red, orange, and other noticeable color paints are applied to the entire outer surface of the individual wires 2a constituting the steel wire 2 as a steel strand. While the used colored layer 3 is formed, no color is applied to the silver aluminum wire 10. When the aluminum wire 10 is melted, the melted portion is not melted. However, if the colored layer 3 of the steel wire 2 exposed in the melted portion is a conspicuous color, visual recognition is easy. In particular, it becomes easy to confirm the melting range by the area of the exposed colored layer 3 of the steel wire 2.
Although the aluminum wire 10 can be colored, since the aluminum wire becomes a current-carrying portion, there is a possibility that when a paint is applied, it acts as a resistance material when connecting the wire from the steel core aluminum to another electric wire or the like. For this reason, it is preferable to apply the coating color to the steel wire 2 side.
In addition, the outer surface of the steel wire 2 is galvanized to prevent corrosion, but the galvanization may be omitted by using a material having a corrosion prevention function as a paint for coating the steel wire. it can.
In the illustrated embodiment, the steel wire 2 is a stranded wire, but it may be a single wire. Further, although the aluminum wire is a single strand, it may be a strand composed of a plurality of layers.

It is sectional drawing of the overhead bare power transmission line which concerns on one Embodiment of this invention. (A) is sectional drawing which shows the state which the melting damage generate | occur | produced in the aluminum wire, (b) is an external view which shows a erosion part.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Steel core aluminum strand, 2 ... Steel wire, 3 ... Colored layer, 10 ... Aluminum wire, 11 ... Melt spot, 12 ... Non-scratch spot

Claims (3)

It is a steel core aluminum stranded wire composed of a steel wire and an aluminum wire that is wound around and integrated with the outer periphery of the steel wire in a layered manner,
A steel core aluminum stranded wire characterized in that a colored layer is formed on an outer surface of at least one of the steel wire and the aluminum wire to make the colors of both different.   A steel core aluminum stranded wire characterized by forming the colored layer on the steel wire to make it different from the color of the aluminum wire.   The steel core aluminum stranded wire according to claim 2, wherein the colored layer is made of a paint having corrosion resistance.

Images