JP2585591B2 - Optical fiber composite single core power cable - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an optical fiber composite single-core power cable in which a single-core power cable such as a single-core OF cable and a single-core cross-linked polyethylene insulated cable is combined with an optical fiber line. It is.

(Background of the Invention) As shown in FIG. 3, a conventional optical fiber composite power cable has one or more optical fiber wires arranged in a twisting gap between three power cores.

In the drawing, (10) is the power line core, and the power line core (10)
An optical fiber wire (B) is arranged in the twisting gap, twisted in a circular shape with the inclusion (11), and a metal sheath (12) is applied to the outside thereof to form an optical fiber composite power cable. ing.

However, in recent years, especially for submarine cables, single-core optical fiber cables with no electromagnetic induction, large communication capacity, and small occupied area have been mainly used for the purpose of reducing cable installation work and reducing the occupied area of the seabed. There is an increasing demand for compounding with power cables. However, since the single-core power cable has no space for arranging optical fiber wires unlike the three-core power cable, an optical fiber composite single-core power cable has been realized despite the above demands. There is no present.

Therefore, in order to realize an optical fiber composite single-core power cable, it is necessary to not only select a space for disposing the optical fiber line, but also to easily take out the composite optical fiber line. It is important to consider so as not to impair.

(Disclosure of the Invention) The present invention provides an optical fiber composite single-core power cable that has fulfilled the above-mentioned demands. The feature of the present invention is that concave portions are previously formed at a constant pitch between a cable core and a metal sheath on the outside thereof. The conductive or semiconductive strip provided is spirally wound and provided, and an optical fiber wire is inserted into a gap between the metal sheath formed of the continuous wire of the concave portion.

FIG. 1 is a perspective view showing each layer of a specific example of an optical fiber composite single core power cable according to the present invention. In this specific example, a single-core OF cable is illustrated as the power cable, but it is needless to say that a cross-linked polyethylene cable and a solid-type oil-paper insulated power cable can be similarly implemented.

In the drawing, (A) is a cable core having an oil-impregnated paper insulation layer (3) on a cable conductor (1) having an oil passage (2) inside, on which an external shielding layer and, if necessary, copper. It is formed by providing a wire weaving cloth tape winding layer (neither is shown). On such a cable core (A), recesses 4a are previously formed at a constant pitch as shown in FIG.
A plurality of conductive or semi-conductive strips (4) provided with helical coils are spirally wound at intervals, and a metal sheath (5) of aluminum, lead, stainless steel or the like is formed on the strip (4).
And an anticorrosion layer (6) of polyethylene, polyvinyl chloride or the like is further provided thereon. Further, in the case of a submarine cable, a seating floor, a sheathing line and a serving layer are further provided on the above.

Then, by winding the conductive or semiconductive strip (4) provided with the concave portion 4a spirally on the cable core A, the concave portion 4a is fixed at a fixed angle as shown in FIG. , The optical fiber A is inserted into this.

In a single-core power cable, a metal sheath (5) also serves as a ground electrode, and a charging current due to a voltage applied between the cable conductor (1) (high voltage portion) and the outer shielding layer is transferred from the outer shielding layer to the metal sheath. I need to wash it away. Therefore, it is necessary to use a conductive or semi-conductive material as the band-like body (4). For example, a braided copper wire, a cloth tape or string woven with the copper fine wire, a carbon particle, or a metal such as copper or aluminum For example, a strip or a filament formed by extruding plastic such as polyethylene, polypropylene, or polybutene mixed with powder, a metal strip such as copper, aluminum, or lead, or a combination thereof is used.

The optical fiber wire (B) may be either single-core or multi-core. The configuration is such that the optical fiber is accommodated in the spiral groove of the spacer having the spiral groove on the outer peripheral surface, and metal or plastic is placed outside the optical fiber. Or a twisted optical fiber on a tension member, and a sheath made of metal, plastic, or the like is provided on the outside thereof, but the configuration is not particularly limited. In addition, in an OF cable or the like impregnated with insulating oil, it is preferable to apply a metal coating such as aluminum or copper to protect the optical fiber from the oil.

The optical fiber composite single-core power cable of the present invention having the above-described structure has an optical fiber line (B) housed in the concave portion 4a of the strip 4 by stripping the metal sheath (5) at the end. Can be easily taken out, and at this time, the cable core (A) is not hurt at all. Therefore, the power cable can be connected in the same manner as in the related art, and is extremely practical.

In the manufacturing process of the OF cable, the band (4)
In order to protect the cable core (A) from being attached to the optical fiber wire (B), it is preferable to provide a wound layer of a copper wire woven cloth tape on the outer shielding layer. In addition, it is preferable to wind a plurality of strips with a gap in order to increase the pitch of the optical fiber line accommodating gap or the oil passage gap formed by these gaps. The number of windings is reduced, and the bending diameter of the optical fiber wire is increased, which is preferable in terms of reducing transmission loss and mechanical strength.

Further, if a gap between the concave portion (4a) of the band-shaped body (4) and the optical fiber line (B) or a concave portion (4a) not accommodating the optical fiber line (B) is formed, these are used to make an oil passage and an oil passage. Since the insulating oil flows relatively smoothly in the longitudinal direction of the cable, the oil flow resistance is further reduced as compared with the case where the oil passage under the metal sheath using the mere band is used, which is advantageous as the oil passage.

In the optical fiber composite single-core power cable according to the present invention, after the optical fiber line is inserted, the band is inserted into the band after the optical fiber line is inserted for the purpose of sufficiently adhering the optical fiber line onto the cable core and protecting the optical fiber line from damage during metal sheathing. It is practically preferable to provide a wound layer made of a copper wire woven cloth tape or a combination of the tape and a metal tape on the body.

(Effect of the Invention) According to the above-described optical fiber composite single-core power cable of the present invention, a conductive or semiconductive strip having recesses provided at a predetermined pitch in advance is wound around a cable core to be continuous. Since the optical fiber line is housed in the concave portion connected to the optical fiber line, the optical fiber line can be taken out without deteriorating the performance of the power cable, and the connection of the power cable can be performed by a conventional method.

Furthermore, by using a conductive or semiconductive band, the metal sheath and the external shielding layer can be electrically connected to allow a charging current to flow.

[Brief description of the drawings]

FIG. 1 is a perspective view showing each layer of a specific example of the optical fiber composite single core power cable of the present invention. FIG. 2 (a) is an explanatory view of a band-shaped body provided with a concave portion, and FIG. 2 (b) is an external view of an optical fiber line inserted state. FIG. 3 is a cross-sectional view of an example of a conventional optical fiber composite power cable. A: cable core, B: optical fiber wire, 1: cable conductor, 3: insulating layer, 4: band, 4a: concave portion,
5: metal sheath, 6: anticorrosion layer, 7: gap.

Claims (1)

(57) [Claims] 1. A conductive or semi-conductive strip having concave portions provided in advance at a constant pitch is spirally wound between a cable core and a metal sheath outside the cable core. An optical fiber composite single-core power cable, wherein an optical fiber line is inserted into a gap with the metal sheath.