CN101807453B - Power cables for the seabed - Google Patents

Abstract

A power cable for seabed comprises a line core (1), a shielding layer (2), a insulation (3), a shielding layer and an inner sheath (4) of the insulation, a sheathed inner cushion (5), a sheathing layer (6) and an external sheathed protective layer (7) which are arranged from inside to outside, and is characterized in that the line core (1) consists of a steel wire and an aluminum wire, the steel wire is positioned the center of the line core (1), and the steel wire and the aluminum wire are twisted into the line core (1) which is formed by a steel-cored aluminium strand structure. Compared with the prior art, the line core of the invention consists of the steel wire and the aluminum wire, the steel wire is positioned the center of the line core, the steel wire and the aluminum wire are twisted into the line core which is formed by the steel-cored aluminium strand structure. The structure has the advantages that since aluminum is used to replace copper, the cost is saved, conductivity is also fully consistent with the standard; since mixing line of steel wire twisted with aluminum wire can free up the insufficient tensile strength of the aluminum wire, and the cable made by the invention reduce the cost, and the conductivity and tensile strength meet the required standards.

Description

Power cables for the seabed

technical field

The invention relates to the technical field of submarine cables, in particular to a submarine power cable.

Background technique

An existing Chinese utility model patent No. 200720108676.8 titled "A Submarine Crosslinked Power Cable" discloses a structure, which includes a wire core, an armored inner lining, and an armored layer arranged from the inside to the outside. And the armored outer sheath, which is characterized in that the armored layer is composed of a number of non-magnetic metal wires evenly arranged around, and the non-magnetic metal wires are provided with a plastic anti-corrosion layer; the advantage is that the non-magnetic metal wire armor structure replaces galvanized steel wire The armored structure not only eliminates the serious eddy current and hysteresis loss caused by the galvanized steel wire armored structure, but also makes the allowable current carrying capacity nearly 30% higher than that of the galvanized steel wire armored cable, and ensures that the submarine communication The tensile strength of the power cable; the non-magnetic metal wire is provided with a plastic anti-corrosion layer, so that the non-magnetic metal wire armored cable can be placed in seawater for a long time without being corroded. But its disadvantage is that it only improves the armor layer, but does not improve the cost, tensile strength and conductivity of the conductor, so the production of this cable consumes a lot of copper, that is, the cost is high, so its structure is still There is room for improvement.

Contents of the invention

The technical problem to be solved by the present invention is to provide a power cable for seabed with low manufacturing cost, high cable tensile strength and qualified electrical conductivity in view of the above-mentioned prior art.

The technical solution adopted by the present invention to solve the above-mentioned technical problems is: the power cable used for the seabed, including the wire core, the shielding layer, the insulating layer, the insulator shielding layer and the inner sheath, and the armored inner cushion layer arranged from the inside to the outside , an armored layer and an armored outer protective layer, characterized in that: the wire core is composed of a steel wire wire and an aluminum wire, the steel wire wire is located at the center of the wire core, and the steel wire wire and the aluminum wire are steel-cored aluminum strands The core formed by the wire structure.

As an improvement, the structure of the aluminum-steel-reinforced wire means that several strands of steel-wire conductors are located at the center, while several strands of aluminum conductors are intertwined outside the steel-wire conductors to form an aluminum-steel-reinforced conductor.

As an improvement, the shielding layer includes a semiconductor electrical tape and a conductor shielding layer, the wire core is wrapped in the semiconductor electrical tape, and the semiconductor electrical tape is wrapped in the conductor shielding layer.

As a further improvement, the insulator shielding layer includes an insulating shielding layer, a semiconductive resistance water buffer layer, a copper tape wrapping layer, and the semiconductive resistance water buffer layer is an insulator shielding layer, and the inner sheath includes a lead sleeve and a semiconductive polymer Vinyl inner liner, its arrangement position is insulated shielding layer, semi-conductive resistance water buffer layer, copper tape wrapping layer, semi-conductive resistance water buffer layer, lead sheath and semi-conductive polyethylene inner liner from inside to outside .

As a further improvement, the armored inner cushion can be selected as an asphalt inner cushion with polypropylene ropes as internal reinforcements; and the armored outer protective layer is an asphalt outer wrapping layer with polypropylene ropes as internal reinforcements.

As a further improvement, the armor layer is composed of a plurality of galvanized steel wire ropes, and the galvanized steel wire ropes form a protective layer with cross-sections distributed on the same circumferential surface.

As a further improvement, the armor layer is provided with magnetic isolation aluminum alloy wires between the galvanized steel wires, and the cross sections of the galvanized steel wires and the magnetic isolation aluminum alloy wires are located on the same circumferential surface.

As a further improvement, an optical cable layer is also provided between the armored layer and the armored inner cushion, and the optical cable layer includes an optical cable, a polyethylene filler wire and a supporting aluminum alloy wire, the optical cable, the polyethylene filler wire and The cross-sections of the supporting aluminum alloy wires are located on the same circumferential surface, and the left sides of every two optical cables are arranged in turn as polyethylene filling lines and supporting aluminum alloy lines, and the right sides of the two optical cables are arranged in sequence as polyethylene filling lines and supporting lines. Aluminum alloy wires, and every two optical cables, two polyethylene filling wires on the left and right, and six supporting aluminum alloy wires form a repeating unit and are arranged to form an optical cable layer.

Compared with the prior art, the present invention uses a wire core composed of a steel wire conductor and an aluminum wire conductor, the steel wire conductor is located at the center of the wire core, and the steel wire conductor and the aluminum conductor are twisted together to form a steel-cored aluminum stranded wire structure. Core. The advantage of this structure is that copper is replaced by aluminum, which not only saves cost, but also fully meets the standard of conductivity, and the mixed wire of steel wire twisted aluminum can avoid the problem of insufficient tensile strength of aluminum wire, so The cable made by the invention not only reduces the production cost, but also the electrical conductivity and the tensile strength meet the prescribed standards.

Description of drawings

Fig. 1 is the structural representation of the embodiment of the present invention;

Fig. 2 is a structural representation of another embodiment of the present invention;

Fig. 3 is the enlarged view of part I in Fig. 1;

Figure 4 is an enlarged view of Part II in Figure 1;

FIG. 5 is an enlarged cross-sectional view of a partial wire core cross-section in FIG. 1 .

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Embodiment 1, as shown in Fig. 1, Fig. 3, Fig. 4 and Fig. 5, the power cable used for the seabed includes a core 1, a shielding layer 2, an insulating layer 3, an insulator shielding layer and an inner core arranged from the inside to the outside. Sheath layer 4, armored inner cushion layer 5, armored layer 6 and armored outer protective layer 7. The armor layer 6 is composed of a plurality of galvanized steel wire ropes 61, and the galvanized steel wire ropes 61 form a protective layer with cross-sections distributed on the same circumferential surface. The wire core 1 is a conductor wire 1 formed by twisting a plurality of aluminum wires and a mixed wire of steel wire 11 twisted aluminum wire 11 that can increase the tensile strength of the cable, wherein the steel wire 11 is located at the center of the wire core 1 Location. The shielding layer 2 includes a semiconductor electrical tape 22 and a conductor shielding layer 21 , the wire core 1 is wrapped in the semiconductor electrical tape 22 , and the semiconductor electrical tape 22 is wrapped in the conductor shielding layer 21 . And described insulator shielding layer comprises insulation shielding layer 41, semiconductive resistance water buffer layer 42, copper tape wraps around cladding 43, semiconductive resistance water buffer layer 42 is insulator shielding layer, and described inner sheath 4 comprises lead sheath 44 And semiconductive polyethylene inner cushion layer 45. The arrangement position is from the inside to the outside: the insulating shielding layer 41, the semi-conductive resistance water buffer layer 42, the copper tape wrapping layer 43, the semi-conductive resistance water buffer layer 42, the lead sleeve 44 and the semi-conductive polyethylene inner cushion layer 45. The armored inner cushion 5 is the asphalt inner cushion with polypropylene rope as the internal reinforcement, and the armored outer protective layer uses polypropylene rope as the asphalt outer wrapping layer for the internal reinforcement.

Embodiment two, as shown in Figure 2, its basic structure is identical with embodiment one, and its difference is that the armor layer 6 is provided with the magnetic isolation aluminum alloy wire 9 between the galvanized steel wire ropes 61, and the galvanized steel wire rope 61 and the magnetic isolation The cross sections of the aluminum alloy wires 9 are located on the same circumferential surface. An optical cable layer 8 is also arranged between the armor layer 6 and the armored inner cushion layer 5, and the optical cable layer 8 includes an optical cable 80, a polyethylene filling wire 81 and a supporting aluminum alloy wire 82, and the optical cable 80, polyethylene The cross-sections of the filling wire 81 and the supporting aluminum alloy wire 82 are located on the same circumferential surface, and the left sides of every two optical cables 80 are arranged in turn as polyethylene filling wires 81 and supporting aluminum alloy wires 82, and the right sides of the two optical cables 80 are The polyethylene filling wires 81 and the supporting aluminum alloy wires 82 are arranged in sequence, and the six wires composed of two optical cables 80 and two polyethylene filling wires 81 and supporting aluminum alloy wires 82 on the left and right are formed into repeating units. Optical cable layer 8.

Claims (7)

1. A power cable for the seabed, comprising a wire core (1), a shielding layer (2), an insulating layer (3), an insulating shielding layer (41), a semiconducting resistance water buffer layer ( 42), copper tape wrapping layer (43), semiconductive resistance water buffer layer (42), lead sheath (44) and semiconductive polyethylene inner cushion layer (45), armored inner cushion layer (5), armored layer (6) and armored outer protective layer (7), characterized in that: the wire core (1) is composed of steel wire and aluminum wire, the steel wire is located at the center of the wire core (1), and the steel wire The conductor and the aluminum conductor are wire cores (1) formed by a steel-reinforced aluminum stranded wire structure; the steel-reinforced aluminum stranded wire structure means that several strands of steel conductors are located at the center, and several strands of aluminum conductors are outside the steel conductors and mutually Stranded into ACSR conductors. 2. The power cable for seabed according to claim 1, characterized in that: the shielding layer (2) comprises a semiconductor electrical tape (22) and a conductor shielding layer (21), and the wire core (1) is wrapped in a semiconductor In the electric tape (22), and the semiconductor electric tape (22) is wrapped in the conductor shielding layer (21). 3. The power cable for seabed according to claim 1, characterized in that: the armored inner cushion (5) is an asphalt inner cushion with polypropylene ropes as internal reinforcing ribs. 4 . The power cable for seabed according to claim 1 , characterized in that: the armored outer protective layer is an asphalt outer wrapping layer with polypropylene ropes as internal reinforcing ribs. 5. The power cable for seabed according to any one of claims 1 to 4, characterized in that: the armor layer (6) is composed of a plurality of galvanized steel wire ropes (61), and the galvanized steel wire ropes (61) A protective layer formed with a structure in which the cross sections are located on the same circumferential surface. 6. The power cable for seabed according to claim 5, characterized in that: said armor layer (6) is provided with a magnetic isolation aluminum alloy wire (9) between galvanized steel wire ropes (61), said The cross-sections of the galvanized steel wire rope (61) and the magnetic isolation aluminum alloy wire (9) are located on the same circumferential surface. 7. The power cable for seabed according to claim 5, characterized in that: an optical cable layer (8) is also arranged between the armored layer (6) and the armored inner cushion (5), and the optical cable layer (8) Including optical cable (80), polyethylene filling wire (81) and supporting aluminum alloy wire (82), described optical cable (80), polyethylene filling wire (81) and supporting aluminum alloy wire (82) The cross sections are located on the same circumferential surface, and the left sides of every two optical cables (80) are arranged in sequence as polyethylene filling wires (81) and supporting aluminum alloy wires (82), and the right sides of the two optical cables (80) are arranged in sequence It is composed of polyethylene filling wire (81), supporting aluminum alloy wire (82), and every two optical cables (80) and two polyethylene filling wires (81) on the left and right, and supporting aluminum alloy wire (82). The wire groups are arranged as repeating units to form an optical cable layer (8).

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