CN107610832B - Submarine cable with ultralow thermal resistance loss and preparation method thereof - Google Patents

Abstract

The invention discloses an ultralow-thermal-resistance-loss submarine cable which comprises a cable insulation wire core, and a metal shielding layer, an insulation lining layer, an armor layer and a tegument layer which are sequentially coated on the cable insulation wire core; the metal shielding layer and the armor layer are connected in a short circuit mode through a conductive structure. The preparation method of the submarine cable with ultralow thermal resistance loss adopts on-line production molding, is simple and convenient to operate and high in production efficiency, and has the advantages that the metal shielding layer and the armor layer are connected in a short mode through the conductive structure, so that the conduction effect is realized, the transmission current is increased, the thermal resistance loss is reduced, the submarine cable is endowed with the ultralow thermal resistance loss performance, the electric quantity loss can be effectively reduced, and the market prospect is wide.

Description

Submarine cable with ultralow thermal resistance loss and preparation method thereof

Technical Field

The invention relates to the technical field of power cable production, in particular to an ultralow-thermal-resistance-loss submarine cable and a preparation method thereof.

Background

With the deep development of the ocean in China, submarine cables with large length and large capacity are widely applied. The metal shielding layer and the armor layer of the traditional submarine cable are isolated by the lining layer and are mutually insulated, so that the thermal resistance loss can be increased invisibly, and the electric quantity of the loss is huge for the submarine cable with large length. Therefore, in order to ensure the full utilization of energy, reducing the loss in power transmission becomes a great technical problem in ocean engineering.

Disclosure of Invention

The invention mainly solves the technical problem of providing the submarine cable with ultralow thermal resistance loss and the preparation method thereof, which can improve current transmission, reduce thermal resistance loss and solve the problems of the conventional submarine cable.

In order to solve the technical problems, the invention adopts a technical scheme that: the submarine cable with the ultralow thermal resistance loss comprises a cable insulation wire core, and a metal shielding layer, an insulation lining layer, an armor layer and an outer coating layer which are sequentially coated on the cable insulation wire core; the metal shielding layer and the armor layer are connected in a short circuit mode through a conductive structure.

In a preferred embodiment of the present invention, the conductive structure is a tin-plated copper woven belt, an aluminum alloy belt or a silver wire.

In a preferred embodiment of the present invention, the outer surface of the conductive structure is covered with a waterproof sealant.

In a preferred embodiment of the present invention, the insulating lining layer comprises a cable sheath and a lining layer sequentially covering the metal shielding layer.

In a preferred embodiment of the invention, the cable insulated wire core comprises a compact circular water-blocking conductor, a conductor shielding layer, an insulating shielding layer and a semi-conductive water-blocking tape from inside to outside in sequence.

In a preferred embodiment of the present invention, the metal shielding layer is a lead layer; the armor layer is a steel wire, a copper wire or a mixed structure of the steel wire and the copper wire.

In order to solve the technical problem, the invention adopts another technical scheme that: the preparation method of the submarine cable with ultralow thermal resistance loss comprises the following steps:

(1) Insulation test: in the production process of the cable, carrying out insulation test on the cable insulation wire core coated with the metal shielding layer and the insulation lining layer on the surface;

(2) Cutting and processing: cutting off the insulation lining layer on the surface of the cable insulation wire core tested in the step (1) to form a cutting opening surrounding the metal shielding layer for one circle, and then cleaning the surface of the metal shielding layer at the cutting opening;

(3) Welding a conductive structure: welding and fixing the conductive structure on the cutting opening in the step (2), and marking;

(4) Filling waterproof sealant: pouring waterproof sealant on the surface and around the conductive structure in the step (3) to cover the conductive structure and the gap between the conductive structure and the cutting opening, and ensuring that the conductive structure is partially led out;

(5) Short-circuiting: producing an armor layer on the surface of the insulating lining layer in the step (1), and welding the leading-out part of the reserved conductive structure in the step (4) with the armor layer to realize short-circuit connection of the metal shielding layer and the armor layer;

(6) Completing production and marking: and (4) producing a covering layer on the surface of the armor layer obtained in the step (5), and marking the short circuit position in the step (5) on the surface of the armor layer to obtain the ultra-low thermal resistance loss submarine cable.

In a preferred embodiment of the present invention, in the step (2), the method of cleaning process is: the surface pitch is removed by gasoline and then the dust is removed by alcohol.

In a preferred embodiment of the present invention, in the step (3), the welding method is thermal welding.

The invention has the beneficial effects that: the preparation method of the submarine cable with ultralow thermal resistance loss adopts on-line production molding, is simple and convenient to operate and high in production efficiency, and has the advantages that the metal shielding layer and the armor layer are connected in a short mode through the conductive structure, so that the conduction effect is realized, the transmission current is increased, the thermal resistance loss is reduced, the submarine cable is endowed with the ultralow thermal resistance loss performance, the electric quantity loss can be effectively reduced, and the market prospect is wide.

Drawings

FIG. 1 is a schematic view of the internal longitudinal structure of a preferred embodiment of an ultra-low thermal resistance loss submarine cable according to the present invention;

FIG. 2 is a schematic structural diagram of a short circuit of an ultra-low thermal resistance loss submarine cable according to the present invention;

the parts in the drawings are numbered as follows: 1. the cable comprises an insulating cable core, 11 parts of a compressed round water-blocking conductor, 12 parts of a conductor shielding layer, 13 parts of an insulating layer, 14 parts of an insulating shielding layer, 15 parts of a semiconductive water-blocking tape, 2 parts of a metal shielding layer, 3 parts of an insulating lining layer, 31 parts of a cable sheath, 32 parts of an inner lining layer, 4 parts of an armor layer, 5 parts of an outer covering layer, 6 parts of a conductive structure and 7 parts of waterproof sealant.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the present invention more comprehensible to those skilled in the art, and will thus provide a clear and concise definition of the scope of the present invention.

Referring to fig. 1 and 2, an embodiment of the present invention includes:

example 1

The invention discloses an ultralow thermal resistance loss submarine cable which comprises a cable insulation wire core 1, and ametal shielding layer 2, an insulation lining layer 3, an armor layer 4 and ategument layer 5 which are sequentially coated on the cable insulation wire core 1; the cable insulation core 1 sequentially comprises a compact round water-blocking conductor 11, aconductor shielding layer 12, an insulation layer 13, an insulation shielding layer 14 and a semi-conductive water-blockingtape 15 from inside to outside; the insulating lining layer 3 comprises acable sheath 31 and alining layer 32 which are sequentially covered on themetal shielding layer 2.

Themetal shielding layer 2 and the armor layer 4 are connected in a short circuit mode through the conductive structure 6, and the metal shielding layer and the armor layer are conducted, so that transmission current is increased, and thermal resistance loss is reduced.Waterproof sealant 7 covers the outer surface of the conductive structure and the gap between the conductive structure and the cutting opening, so that a waterproof effect is achieved.

The conductive structure 6 is a tin-plated copper braided belt; themetal shielding layer 2 is a lead layer; the armor layer 4 is a steel wire, a copper wire or a mixed structure of the steel wire and the copper wire.

The preparation method of the submarine cable with ultralow thermal resistance loss comprises the following steps:

(1) And (3) insulation test: in the production process of the cable, an insulation resistance meter is used for carrying out insulation test on the cable insulation wire core coated with the metal shielding layer and the insulation lining layer on the surface so as to ensure that the manufactured cable insulation wire core is intact, and the cable insulation wire cores at two ends are provided with margins of more than 1m so as to ensure that the joint is not subjected to tension at two sides after the manufacture is finished;

(2) Cutting and processing: cutting off the insulation lining layer on the surface of the cable insulation wire core tested in the step (1) to form a cutting opening surrounding the metal shielding layer for one circle, and then cleaning the surface of the metal shielding layer at the cutting opening, wherein the method comprises the following steps: removing asphalt on the surface by using gasoline, and removing dust by using alcohol;

(3) Welding a conductive structure: welding and fixing the tin-plated copper braided belt on the cutting opening in the step (2) in a thermal welding mode, and marking;

(4) Filling waterproof sealant: pouring waterproof sealant on the surface and around the tinned copper woven belt in the step (3) to cover the tinned copper woven belt and a gap between the tinned copper woven belt and a cutting opening, performing waterproof protection, and ensuring that a tinned copper woven belt structure is partially led out;

(5) Short-circuiting: producing an armor layer on the surface of the insulating lining layer in the step (1), and welding the leading-out part of the reserved conductive structure in the step (4) with the armor layer to realize short-circuit connection of the metal shielding layer and the armor layer;

(6) Completing production and marking: and (4) producing a covering layer on the surface of the armor layer obtained in the step (5), and marking the short circuit position in the step (5) on the surface of the armor layer to obtain the ultra-low thermal resistance loss submarine cable.

Example 2

The difference from example 1 is that the conductive structure is an aluminum alloy strip.

Example 3

The difference from example 1 is that the conductive structure is a silver wire.

According to the submarine cable with the ultralow thermal resistance loss, the metal shielding layer and the armor layer are connected in a short circuit mode through the conductive structure, so that the effect of conduction is achieved, transmission current is increased, and the thermal resistance loss is reduced.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally arranged when the products of the present invention are used, and are used for convenience of description and simplicity of description only, and do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. The submarine cable with ultralow thermal resistance loss is characterized by comprising a cable insulation wire core, and a metal shielding layer, an insulation lining layer, an armor layer and a tegument layer which are sequentially coated on the cable insulation wire core; the metal shielding layer and the armor layer are in short-circuit connection through a conductive structure;

the preparation method of the submarine cable with ultralow thermal resistance loss comprises the following steps:

(1) And (3) insulation test: in the production process of the cable, carrying out insulation test on the cable insulation wire core coated with the metal shielding layer and the insulation lining layer on the surface;

(2) Cutting and processing: cutting off the insulation lining layer on the surface of the cable insulation wire core tested in the step (1) to form a cut surrounding the metal shielding layer for one circle, and cleaning the surface of the metal shielding layer at the cut;

(3) Welding a conductive structure: welding and fixing the conductive structure on the cutting opening in the step (2), and marking;

(4) Filling waterproof sealant: pouring waterproof sealant on the surface and around the conductive structure in the step (3) to cover the conductive structure and the gap between the conductive structure and the cutting opening, and ensuring that the conductive structure is partially led out;

(5) Short-circuiting: producing an armor layer on the surface of the insulating lining layer in the step (1), and welding the leading-out part of the reserved conductive structure in the step (4) with the armor layer to realize short-circuit connection of the metal shielding layer and the armor layer;

(6) Completing production and marking: and (4) producing a covering layer on the surface of the armor layer obtained in the step (5), and marking the short circuit position in the step (5) on the surface of the armor layer to obtain the ultra-low thermal resistance loss submarine cable.

2. The ultra-low thermal resistance loss submarine cable according to claim 1, wherein said electrically conductive structure is a tin-plated copper braid, an aluminum alloy tape, or a silver wire.

3. The ultra low thermal resistance loss submarine cable according to claim 1 or 2, wherein the outer surface of said electrically conductive structure is covered with a waterproof sealant.

4. The ultra-low thermal resistance loss submarine cable according to claim 1, wherein the insulating lining layer comprises a cable sheath and an inner lining layer which sequentially cover the metal shielding layer.

5. The ultra-low thermal loss resistance submarine cable according to claim 1, wherein the cable insulated core comprises, in order from the inside to the outside, a compacted circular water-blocking conductor, a conductor shield, an insulating layer, an insulating shield, and a semi-conductive water-blocking tape.

6. The ultra-low thermal resistance loss submarine cable according to claim 1, wherein said metallic shield layer is a lead layer; the armor layer is a steel wire, a copper wire or a mixed structure of the steel wire and the copper wire.

7. The ultra-low thermal resistance loss submarine cable according to claim 1, wherein in step (2), the method of cleaning is: the surface pitch is removed by gasoline and then the dust is removed by alcohol.

8. The ultra low thermal resistance loss submarine cable according to claim 1, wherein in step (3), the welding method is thermal welding.

Images