JP2564301Y2 - Optical fiber composite overhead electric wire - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber composite overhead electric wire used for an overhead ground line of an overhead transmission line.

[0002]

2. Description of the Related Art Conventionally, as an optical fiber composite overhead wire, a built-in type optical fiber composite overhead ground wire in which an optical fiber unit is built in the center of an overhead ground wire, and an optical fiber unit is spirally wound around the outer circumference of the overhead ground wire. The optical fiber composite overhead ground wire wound around is used.

[0003]

With a built-in type optical fiber composite overhead electric wire, if a trouble such as disconnection occurs in the optical fiber unit, it is difficult to repair or replace only the optical fiber unit. It is necessary to replace the whole. In the case of the wound optical fiber composite overhead electric wire, there is no problem as described above. However, a process of manufacturing an ordinary overhead electric wire, winding the optical fiber unit after the overhead wire is required, and the construction is troublesome.

[0004]

SUMMARY OF THE INVENTION The present invention provides an optical fiber composite overhead electric wire which has solved the above-mentioned problems, and has a structure in which a wire containing an optical fiber unit is formed on the outermost layer by an aluminum-coated steel wire. (Including an aluminum alloy-coated steel wire), and the strand containing the optical fiber unit comprises an optical fiber around a central tension member.
A resin coating layer and an aluminum coating layer (including an aluminum alloy coating layer) around the optical fiber unit consisting of twisted core wires
Sequentially made from those provided, the outer diameter d ₁ of the optical fiber unit, the outer diameter d ₂ of the resin coating layer, the outer diameter d ₃ of the aluminum coating _{layer, 0.5d 1 ≦ d 2 -d 1} ≦ d 1 And 0.1d ₁
≦ d ₃ −d ₂ ≦ d ₁ .

[0005] The resin coating layer of the element wire containing the optical fiber unit can be made of heat-resistant plastic or FRP (fiber reinforced plastic), and the aluminum coating layer can be formed by vapor deposition of aluminum or aluminum alloy.

[0006]

[Function] This optical fiber composite overhead electric wire is made by twisting the strand containing the optical fiber unit on the outermost layer together with other strands. When a trouble such as disconnection occurs in the optical fiber unit, the element wire in the optical fiber unit can be repaired or replaced.

[0007] The resin coating layer and the aluminum coating layer of the element wire containing the optical fiber unit prevent electric corrosion due to contact with an adjacent aluminum-coated steel wire, and prevent the optical fiber unit from dielectric breakdown when a large current flows. This is to prevent damage. The outer diameter d ₁ of the optical fiber unit, the outer diameter d ₂ of the resin coating layer, to the relationship between the outer diameter d ₃ of the aluminum coating layer as described above, the optical fiber unit containing element for the aluminum-coated steel wire This is because the rate of decrease in the tensile strength of the wire with respect to the aluminum-coated steel wire is kept within 5% and the decrease in strength as an overhead electric wire is reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. This optical fiber composite overhead ground wire is formed by twisting an aluminum-coated steel wire 2 having a sector shape in cross section around a center aluminum-coated steel wire 1, and further having an aluminum-coated steel wire 3 having a circular cross section as the outermost layer.
Together with the strands 4 containing the optical fiber unit.

The strand 4 containing the optical fiber unit has a configuration as shown in FIG. That is, an optical fiber core 6 is twisted around the center tension member 5 to form an optical fiber unit 7, and a resin coating layer 8 and an aluminum coating layer 9 are sequentially provided around the optical fiber unit 7. The resin coating layer 8 is made of heat-resistant plastic or FR.
The aluminum coating layer 9 is formed by vapor deposition of aluminum or an aluminum alloy.

[0010] In the configuration as FIG. 2, the outer diameter d ₁ of the optical fiber unit 7, the outer diameter d ₂ of the resin coating layer 8, by changing the relationship between the outer diameter d ₃ of the aluminum coating layer 9, light Table 1 shows the results of examining the rate of decrease in the tensile strength of the strand 4 containing the fiber unit with respect to the aluminum-coated steel wire 3.

[0011]

[Table 1]

From the above results, the relationship between d ₁ , d ₂ and d ₃ is 0.5d ₁ ≦ d ₂ −d ₁ ≦ d ₁ and 0.1d ₁ ≦ d
It was confirmed that if the condition of ₃₋ d ₂ ≦ d ₁ was satisfied, the reduction rate of the tensile strength of the strand 4 containing the optical fiber unit with respect to the aluminum-coated steel wire 3 was within 5%. If the rate of decrease in the tensile strength of the strand is kept within 5%, even if the number of strands in the optical fiber unit is up to 25% of the total number of strands, the tensile strength of the overhead ground wire is reduced. The reduction rate can be suppressed to within 5%, and it has been confirmed that there is no particular problem in the standard.

[0013]

As described above, in the optical fiber composite overhead electric wire according to the present invention, since the strand containing the optical fiber unit is twisted together with other strands on the outermost layer, trouble such as disconnection of the optical fiber unit occurs. In the case of occurrence, the element wire in the optical fiber unit can be repaired or replaced, and the production and the wiring work can be easily performed.

Further, since the element wire containing the optical fiber unit has a resin coating layer and an aluminum coating layer, it is possible to prevent electrolytic corrosion caused by contact with an adjacent aluminum coating steel wire.
The optical fiber unit can be prevented from being damaged due to dielectric breakdown or the like when a large current flows. Further, since the rate of decrease in the tensile strength of the strand containing the optical fiber unit with respect to the aluminum-coated steel wire is small, the decrease in strength as an overhead electric wire can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of an optical fiber composite overhead ground wire according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an optical fiber unit-containing wire used for the optical fiber composite overhead ground wire of FIG.

[Explanation of symbols]

 1, 2, 3: Aluminum coated steel wire 4: Element wire with optical fiber unit 7: Optical fiber unit 8: Resin coating layer 9: Aluminum coating layer

Claims (1)

(57) [Scope of request for utility model registration] 1. An optical fiber unit-containing element wire is twisted together with an aluminum-coated steel wire (including an aluminum alloy-coated steel wire) on the outermost layer, wherein the optical fiber unit-containing element wire is wound around a center tension member. Fiber optic core
It consists of stranding resin coating layer and the aluminum coating layer around the optical fiber unit formed by those sequentially provided (including aluminum alloy coating layer), the outer diameter of the optical fiber unit d ₁
When an outer diameter d ₂ of the resin coating layer, the outer diameter d ₃ of the aluminum coating layer
Is 0.5d ₁ ≦ d ₂ −d ₁ ≦ d ₁ and 0.1d ₁ ≦ d
An optical fiber composite overhead electric wire, wherein a relationship of ₃₋ d ₂ ≦ d ₁ is satisfied.