JPH0427644B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an optical cable composite overhead ground wire in which an optical cable is embedded in an overhead ground wire for a power transmission line, and particularly relates to a method for manufacturing an optical cable composite overhead ground wire in which reinforced optical cables are twisted together. It is about the method.

In recent years, in the field of overhead power transmission, as power transmission capacity has increased, power generation and substation facilities have become larger, and power generation and substations have tended to be located in remote locations. In order to cope with this, communication lines have been used such as electric power carriers and microwaves, but the former has a limited information capacity and cannot centralize grid protection control, and the latter is limited by location conditions and other communication services. There were drawbacks such as the difficulty in securing lines due to the diversification of networks.

These problems are solved by using an optical cable composite overhead ground wire in which an optical cable is embedded within the overhead ground wire. Various structures can be considered for the optical cable composite overhead ground wire, but for ease of manufacturing and to protect the optical cable during manufacturing and use, it is recommended to protect a single optical cable or multiple optical cables with a metal pipe.
A composite overhead ground wire in which this wire is twisted together with other overhead ground wire constituent wires is preferred.

The present invention relates to a method for manufacturing an optical cable composite overhead ground wire using this type of metal pipe sheath-reinforced optical cable. Conventional methods for creating metal pipe sheath-reinforced optical cables used in optical cable composite overhead ground wires include inserting the optical cable into a previously prepared pipe, forming a metal tape into a circle around the optical cable, and welding the seam. A method was taken. However, with respect to reinforced optical cables used in optical cable composite overhead ground wires, the former has a limit on the length of the cable that can be inserted, and the latter has difficulties in forming small diameter pipes and is affected by heat during welding. This had the disadvantage that the cable protection layer was damaged.

In view of the above points, the present invention provides a method for economically manufacturing a long optical cable composite overhead ground wire without causing damage to the optical cable.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for manufacturing a reinforced optical cable used for the optical cable composite overhead ground wire of the present invention shown in the drawings will be described below.

As shown in FIG. 1, a metal tape B sent out from a metal tape supply 2 is attached to an optical cable A sent out from an optical cable supply 1 through a cleaning tank 3, a tape slitter 4, guide rollers 5 and 6, and then vertically spliced by a forming machine 7. A pipe with an inner diameter of 4 mmφ or more is coated and the seam portion is welded using a welding machine 8.

9 indicates a squeeze roll. Immediately after welding, the die or roll 1 is cooled in a cooling tank 10.
1, the cable is expanded into a predetermined shape to form a metal-coated optical cable C, which is then wound onto a winder 12. FIG. 2A shows a sectional view taken along the line a-a' in FIG. 1, and FIG. 2A shows a sectional view taken along the line bb' in FIG.

Here, the pipe with an inner diameter of 4 mmφ or more is 4 mm.
If it is less than φ, not only will the optical cable protective layer deteriorate due to the heat effect during welding, but also when directly molding a small diameter pipe, an extremely thin tape will be used, but the tape edge This is because they tend to overlap due to their tight momentum, and if a relatively thick tape is used instead of such thin tape,
This is because the cross section resembles a chestnut, and the abutting portion has a sharp point, making it difficult to form a substantially perfect circle.The present invention has solved this problem by using extremely conventional means. It is something.

Furthermore, when expanding the pipe, it is possible to make the wall thickness of the pipe uniform by using a hollow floating plug provided with a passage for the optical cable, rather than just empty drawing. Further, the welding itself may be TIG welding, high frequency welding, or other known methods.

An optical cable composite overhead ground wire is manufactured by twisting Al or Al alloy zinc-plated steel wires or aluminum-coated steel wires using the obtained metal-coated reinforced optical cable as a center wire.

Next, examples of the present invention will be shown.

(1) 5052, Al alloy 18.8mm width x 0.4mm thickness tape 0.9
It was supplied vertically to a mmφ4-core optical cable, formed into a concentric pipe with an outer diameter of 6mmφ, and the seam was TIG welded. Immediately after welding, the pipe was cooled with water and expanded to an outer diameter of 4.2 mmφ without bending the pipe. At this time, the optical cable was not subject to thermal or mechanical deterioration.

This aluminum-coated optical cable with an outer diameter of 4.2 mmφ is used as the center line, and a wire with an Al ratio of 62% is placed around it.
18 aluminum coated steel wires of 4.2mmφ were twisted together.
Optical cable composite overhead ground wire.

(2) The optical cable composite overhead ground wire obtained in (1) above is arranged in a regular hexagon with a side of 6 m and has a diameter of 450 mm.
30 times between the gold wheels of φ with a tension of 1200Kg, then 2500Kg
The optical cable was passed through it five times without any damage.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a method for manufacturing a reinforced optical cable used for an optical cable composite overhead ground wire according to the present invention, Fig. 2A is a sectional view taken along line a-a' in Fig. 1, and Fig. 2A is a sectional view taken along line a-a' in Fig.
A cross-sectional view taken along the −b′ line is shown. 1 is an optical cable supply, 2 is a metal tape supply, 3 is a cleaning tank, 4 is a tape slitter, 5, 6
is a guide roll, 7 is a molding machine, 8 is a welding machine, 9 is a squeeze roll, 10 is a cooling machine, 11 is a die,
12 is a winding machine, A is an optical cable, B is a metal tape, and C is a metal coated optical cable.

Claims (1)

[Claims] 1. Form an aluminum alloy tape around the multi-core optical cable to an inner diameter of 4 mm or more, weld the seam, and immediately after cooling, expand the tube using dies or rolls, use the expanded metal-coated optical cable as the center line, and place around it. A method for manufacturing an optical cable composite overhead ground wire, which comprises twisting aluminum or aluminum alloy zinc-coated wires or aluminum-coated steel wires.