JPH09288916A - Power cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To distinguish power cables surely and easily, enhance work efficiency, and prevent errors based on mis-recognition by coloring at least the layer positioning on the outermost shell among protection layers corresponding to the application, a structure, and a disposing position, and the like. SOLUTION: The respective layers of a protection layer 40 are colored in different colors. For example, a polypropylene yarn layer 19 on the outermost shell is in red, an armoring iron wire 18 is in blue, a polypropylene yarn layer 17 is in yellow, an armoring iron wire 16 is in green, a polypropylene yarn layer 15 is in white. The colors of the polypropylene yarn layer 19 positioning on the outermost shell are properly set depending on the application, the laying and disposing position, and the like of a submarine cable. For instance, when two cables are simultaneously laid, a left side is in red, and a right is in blue.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power cable having a multilayer structure in which an insulating layer and a protective layer are formed around a conducting portion, and more particularly to a power cable suitable for installation on the seabed.

[0002]

2. Description of the Related Art Conventionally, in a power cable laid on the seabed, that is, a submarine cable, an outer periphery of a conductor portion is covered with an insulator, and a metal shield wire is wound on the conductor and fixed with asphalt or the like. Later, in order to protect against impacts when laying on the sea floor, anchoring of ships, bottom fishing, etc. Is forming.

[0003]

However, in the conventional power cable, the color of the outermost layer is the material color, and usually only the color (black) of asphalt is present. Since it is formed, it is extremely difficult to judge at a glance which cable is used for what purpose when a plurality of cables are arranged in parallel. Therefore, when performing a repair work on a cable, first, the cable to be repaired must be specified, and there is also a risk that a mistake in work or the like may occur due to incorrect recognition of the cable.

The present invention has been made to solve the above problems of the conventional power cable, and an object thereof is to provide a power cable capable of easily identifying and printing a plurality of cables.

[0005]

A power cable according to the present invention is a power cable in which at least a single insulating layer and a protective layer are formed around a conducting portion, and the power cable is located at least at the outermost shell of the protective layer. Layer, its application, structure,
It is colored in a color corresponding to the arrangement position and the like. Therefore, according to this power cable, even when a plurality of power cables are installed in parallel, the operator can recognize the target cable at a glance and can significantly improve the work efficiency, It is also possible to prevent the occurrence of work mistakes and the like due to the incorrect recognition of the cable.

If the outermost layer is colored in a color different from that of the inner layer, when the protective layer is damaged, the outer layer will be visually different due to the difference in color from the inner layer. The damaged portion can be easily determined, and the repair work can be simplified. It is conceivable that the layer at the outermost shell is preferably a yarn layer and the color of the strands of this yarn layer is colored.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. The power cable shown here is a 350 kV direct current submarine cable used when installed on the seabed, and has a multilayer structure as shown in FIGS. 1 and 2. 1 is an explanatory perspective view showing a partial cutaway of the internal structure of a submarine cable showing an embodiment of the present invention, and FIG. 2 is a vertical sectional front view of the submarine cable.

In the figure, reference numeral 1 is an oil conduit pipe provided at the center of the submarine cable, and inside thereof (for insulation)
An oil passage 1a that allows the oil to flow is formed. 10 is a conduction layer formed along the periphery of the oil conduction pipe 1,
The conductive layer 10 includes a conductor 2 made of electrolytic copper and the conductor 2
The conductive screen 3 and the conductive screen 4 cover and fix the outer periphery of the. Reference numeral 20 denotes an insulating layer provided on the outer peripheral portion of the conductive layer 10. This insulating layer 20 is made of insulating paper 5,
The insulating screen 6 covers the insulating paper 5, and the insulating binder 7 covers the insulating screen 6.

Reference numeral 8 denotes a metal sheath that protects the insulating layer 20 and has pressure resistance against the pressure of the insulating oil, and is made of a lead alloy here. Reference numeral 30 denotes a sheath reinforcing layer for protecting the metal sheath 8, and the sheath reinforcing layer 30 includes the fiber tape 9 and the stainless tape 1.
1a and a fiber tape 11b. And
On the outer periphery of the sheath reinforcing layer 30, a lead-free anticorrosion layer 12 made of polyethylene, a fiber tape 13, and an anti-tere.
Copper tapes 14 for do (for countermeasures against worms) are sequentially provided. Further, 40 is a protective layer, and this protective layer 40
The polypropylene yarn layer 15 covering the sheath reinforcing layer 30, the outer iron wire 16 wound around the outer periphery of the polypropylene yarn layer 15, the polypropylene yarn layer 17 covering the outer iron wire 16, and the polypropylene yarn layer 17 It consists of a wound outer iron wire 18 and a polypropylene yarn layer (outermost shell layer) 19 that covers the outer iron wire 18, which protects the cable from the harsh environment that is prone to electrolytic corrosion, abrasion, various fishing injuries, etc. I'm supposed to get it.

Then, in the protective layer 40, the layers constituting the protective layer 40 are colored in different colors. For example, the polypropylene yarn layer 19 located in the outermost shell of each layer 19
The layers are sequentially colored in different colors, such as red, the outer iron wire 18 located inside thereof is blue, the polypropylene yarn layer 17 is yellow, the outer iron wire 16 is green, and the polypropylene yarn layer 15 is white. In addition, it is desirable to set the color of the adjacent layers to a color having a large difference in brightness as much as possible. Further, the polypropylene yarn layer 19 located on the outermost shell
The color of is properly set depending on the use of the submarine cable or the position of cloth on the seabed. For example, when two cables C1 and C2 are laid at the same time as shown in FIG. 2, the cable C1 located on the left side is red and the submarine cable C2 located on the right side is blue, depending on the laying position of the submarine cables. Set a different color.
In addition, when laying multiple strands of three or more strands, different colors are similarly set depending on the laying position of each cable.

As described above, in the above embodiment,
The color of the polypropylene yarn layer 19 located on the outermost shell is
Because it is colored in a color according to its application, installation position, etc.,
Even when there are many strips of cable within a predetermined width, an operator can identify the cable to be repaired at a glance during cable repair work, and the work can be performed efficiently.

Further, in this embodiment, since the layers constituting the protective layer 40 are formed in different colors, if there is a damaged portion in the protective layer 40, the damaged state is exposed to the outside. By checking the color, you can easily check. For example, when the layers constituting the protective layer 40 are sequentially configured from the outermost shell yarn layer 19 in a color scheme such as red, blue, yellow, green, and white, yellow is visually recognized at the damaged portion and green. Is not visible,
It can be judged that the protective layer 40 is damaged in the three layers of the polypropylene yarn layer 19, the armoring iron wire 18, and the polypropylene yarn layer 17, and confirmation and repair work can be performed quickly and appropriately.

In the above embodiment, the polypropylene yarn layer 19 located at the outermost shell of the submarine cable.
Was colored with a single color according to its use and installation position, but by combining a plurality of colors with the layer located at the outermost shell, for example, drawing a pattern as shown in C1 and C2 of FIG.
The cables may be identified by the difference in this pattern.

Further, in each of the above-mentioned embodiments, coloring or pattern formation on the polypropylene yarn layer at the outermost shell position of the submarine cable may be carried out by using the color which each fiber constituting this layer has. Alternatively, it may be performed by applying some coating to the outer surface of the same layer. further,
The present invention is not limited to submarine cables, and can be applied to other power cables and optical / power optical composite cables.

[0015]

As described above, according to the power cable of the present invention, the color of the layer at the outermost shell position of each power cable can be set according to the use and laying position of the power cable. Therefore, when repairing the power cable, the power cable can be reliably identified,
It is possible to improve the efficiency of the work, and it is possible to prevent the occurrence of a work error due to the incorrect recognition of the power cable. In addition, the protective layer is composed of a plurality of layers,
If each layer is colored in a different color, the damaged state of the power cable can be easily confirmed, and the confirmation and repair work can be performed more quickly and appropriately.

[Brief description of drawings]

FIG. 1 is an explanatory perspective view showing an internal structure of a submarine cable according to a first embodiment of the present invention with a part cut away.

FIG. 2 is a vertical sectional front view of what is shown in FIG.

FIG. 3 is an explanatory plan view showing a laid state of the submarine cable shown in FIG. 1.

FIG. 4 is an explanatory plan view showing a laid state of a submarine cable according to a second embodiment of the present invention.

[Explanation of symbols]

 10 Conductive part 20 Insulating layer 40 Protective layer 19 Polypropylene yarn layer (outermost shell layer) C Submarine cable C1 Submarine cable C2 Submarine cable

Claims (3)

[Claims] 1. A power cable in which at least a single insulating layer and a protective layer are formed around a conductive portion, wherein at least the outermost layer of the protective layer is used, structured and arranged. The power cable is characterized by being colored in a color corresponding to the position. 2. A power cable in which at least a single insulating layer and a protective layer are formed around a conductive portion, wherein at least the outermost layer of the protective layers is located inward of the outermost layer. The power cable according to claim 1, wherein the power cable is colored in a color different from that of the layer. 3. The power cable according to claim 1, wherein the outermost layer is a yarn layer, and the strands of the layer are colored.