WO2018223827A1

WO2018223827A1 - Ultra-large cross-section high-voltage low-loss combined optical-fiber submarine cable and manufacturing method thereof

Info

Publication number: WO2018223827A1
Application number: PCT/CN2018/087259
Authority: WO
Inventors: 宋光辉
Original assignee: 江苏亨通高压海缆有限公司
Priority date: 2017-06-05
Filing date: 2018-05-17
Publication date: 2018-12-13
Also published as: CN107195367A; CN107195367B

Abstract

An ultra-large cross-section high-voltage low-loss combined optical-fiber submarine cable and a manufacturing method thereof are provided. The submarine cable comprises cable cores, an optical unit (8), a filling strip (10), and a sequentially coated tape (9), inner liner layer (11), armor layer (12), and outer layer (13). The cable core comprises, from the inside to the outside, a water blocking conductor (1), a conductor shielding layer (2), an insulating layer (3), an insulating shielding layer (4), a water blocking buffer layer (5), a lead sleeve (6), and an outer sheath (7). The cable cores are twisted to form a central hole, and the optical unit (8) is disposed in the central hole. The present technical solution adopts an advanced production apparatus to improve production efficiency and product quality of submarine cables. The submarine cables manufactured thereby have the following advantages: an optical unit is disposed in a central hole after the cable cores are formed into a cable, and the optical unit is not subject to forces during production and laying; a filling strip is made of a semiconductor material to form an equipotential between a lead sleeve and an armor layer, effectively reducing thermal resistance loss during transmission, and helping alleviate the global energy crisis; and the structural design of the armor layer causes the current carrying capacity to be the same for the entire cable.

Description

Ultra-large section high voltage low loss fiber composite submarine cable and preparation method thereof

Technical field

The invention relates to the technical field of submarine cable preparation, in particular to an ultra-large cross-section high-voltage low-loss optical fiber composite submarine cable and a preparation method thereof, and the prepared cable can be used as a 10-core submarine power cable of 10 to 750 kV.

Background technique

At present, the common optical fiber composite three-core submarine power cable, such as the submarine power cable disclosed in the announcement number CN 202394580 U and the composite cable disclosed in the announcement number CN 201984890 U. The cable core of the former is composed of a water blocking conductor and an inner shielding layer, an insulating layer, an outer shielding layer and a water blocking buffer layer which are sequentially disposed outside the water blocking conductor, and a cable unit is disposed in the gap of the cable core, and a space around the cable unit is provided. Filled with a filler, the filler and the power cable are sequentially provided with a wrapping tape, an inner cushion layer, an armor layer and an outer layer; the latter core comprises a stranded insulated core and a filling strip; The strip is provided with an axially slotted slotted hole; the fiber slot unit is disposed in the slotted hole.

The existing processing technology of the optical fiber composite three-core submarine power cable is complicated, and the optical unit in the cable forming process is very vulnerable to the torsion of the cable core, causing damage to the optical unit; the thermal resistance loss is large, and the transmission is long-distance sea-line cable. The loss is large. In addition, the armored layer structure is single, the seabed section and the landing section external ambient temperature are different, the matching of the submarine cable and the landing section cable current carrying capacity is not enough; the cable filling does not have the conductive function, and the lead sleeve and the armored equipotential are difficult to achieve, The thermal resistance is large.

Summary of the invention

The technical problem to be solved by the present invention is to provide an ultra-large cross-section high-voltage low-loss optical fiber composite submarine cable and a preparation method thereof, which can solve the above-mentioned deficiencies of the existing three-core cable.

In order to solve the above technical problem, a technical solution adopted by the present invention is to provide an ultra-large cross-section high-voltage low-loss optical fiber composite submarine cable, comprising: a cable core, a light unit, a filler strip, and a sheath, light, and the like. a belt, an inner liner layer, an armor layer and an outer layer on the outer side of the unit and the filler strip; wherein the cable core is sequentially blocked by a water blocking conductor, a conductor shielding layer, an insulating layer, an insulating shielding layer, and a water blocking buffer from the inside to the outside The layer, the lead sleeve and the outer sheath are formed; the cable core has a plurality of cores and is twisted to form a center hole, and the light unit is placed in the center hole.

In a preferred embodiment of the invention, the filler strip is a semiconductor material that forms an equipotential with the lead sleeve and the armor layer.

In a preferred embodiment of the present invention, the conductor, the water blocking pressed circular configuration, the maximum cross-sectional area of filaments twisted 30mm ^2, the maximum cross-sectional area of 3500mm ^2, pressed coefficient was 97.5%.

In a preferred embodiment of the invention, the insulating layer has a minimum eccentricity of no more than 1.3% and a maximum withstand voltage of 750 kV.

In a preferred embodiment of the present invention, the armor layer comprises a steel wire armor layer and a copper wire armor layer which are alternately connected in sequence, wherein the steel wire armor layer is coated on the sea bottom section of the cable. The copper wire armor layer is wrapped around the landing section of the cable.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a method for preparing an ultra-large cross-section high-voltage low-loss optical fiber composite submarine cable, comprising the following steps:

(1) Preparing the cable core: comprising preparing a water-blocking conductor, three-layer co-extruding to prepare a conductor shielding layer, an insulating layer and an insulating shielding layer, eliminating the stress and then wrapping the water-blocking buffer layer, extruding the lead sleeve, and extruding the outer sheath, Obtaining the cable core;

(2) Cabling: cross-linking the cable cores to form a central hole between the cores, and two-to-two contact between the cores on any section after the cable is formed;

(3) A light-integrating unit is built into the center hole formed by the cable, and a water-blocking conductor is disposed, and then the inner liner is wrapped, the armor is wrapped, and the outer layer is finally wrapped to obtain the submarine cable.

In a preferred embodiment of the present invention, in the step (1), the water-blocking conductor is prepared by first drawing and annealing with a giant puller to obtain a monofilament, and then penetrating the monofilament into the 127. The wire stranding machine is placed in a circular nano-mold, and then a water-blocking material is added thereto, and the circular water-blocking conductor is pressed by twisting.

In a preferred embodiment of the present invention, in the step (1), the three-layer co-extrusion preparation of the conductor shielding layer, the insulating layer and the insulating shielding layer adopts a vertical cross-linking production line and is extruded through a cone head. It is obtained that the highest voltage of the obtained insulating layer is 750 kV, and the minimum eccentricity is not more than 1.3%.

The invention has the beneficial effects that the preparation method of the ultra-large cross-section high-voltage low-loss optical fiber composite submarine cable adopts the advanced production equipment, improves the production efficiency of the submarine cable and the quality of the finished product, and the prepared submarine cable has the following advantages. :

1. The light unit is placed in the central hole after the cable core is cabled, which ensures that the light unit is completely unstressed during the production and laying process, and effectively protects the light unit; in addition, the light unit can completely avoid moisture, sunlight, Erosion of smoke, etc.; suitable for various types of cables, providing communication, temperature measurement, monitoring and other functions;

2. The filling strip is made of semiconductor material, which forms an equipotential between the lead sleeve and the armor layer, which effectively reduces the thermal resistance loss during transmission and helps to alleviate the global energy crisis;

3. The structural design of the armor layer achieves the same current carrying capacity of the entire cable.

DRAWINGS

1 is a schematic cross-sectional view showing a preferred embodiment of a super large cross section high voltage low loss optical fiber composite submarine cable according to the present invention;

2 is a flow chart showing a process for preparing an ultra-large cross-section high voltage and low loss optical fiber composite submarine cable;

The components of the drawings are marked as follows: 1. water blocking conductor, 2. conductor shielding layer, 3. insulating layer, 4. insulating shielding layer, 5. water blocking buffer layer, 6. lead sleeve, 7. outer sheath, 8. Light unit, 9. Tape, 10. Filler strip, 11. Inner liner, 12. Armor layer, 13. Outer layer.

detailed description

The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings, in which the advantages and features of the invention can be more readily understood by those skilled in the art.

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

Example 1

An ultra-large cross-section high-voltage low-loss optical fiber composite submarine cable comprising a plurality of (three or more) cable cores, which are sequentially composed of a water blocking conductor 1, a conductor shielding layer 2, an insulating layer 3, and an insulating shielding layer from the inside to the outside. 4. The water blocking buffer layer 5, the lead sleeve 6 and the outer sheath 7 are formed; the cores are cross-linked and twisted together, a central hole is formed between the cores, and the light unit 8 is placed in the central hole, and the submarine cable is During the production and laying process, the light unit is completely unstressed and can be effectively protected from damage. The filling strip 10 is filled in the center hole and the outer circumference of each of the cores, and the outer side thereof is sequentially coated with a tape 9, an inner liner 11, an armor layer 12 and an outer layer 13.

Wherein, the filling strip 10 is made of a semiconductor material, and is connected with the short wires of the lead sleeve 6 and the armor layer 12 to form an equipotential between the lead sleeve 6 and the armor layer 12, that is, the lead sleeve 6, the filling strip 10, and The equipotential is formed between the armor layers 12, which can reduce the loss of thermal resistance during transmission, that is, reduce the line loss, which can effectively alleviate the global energy crisis; in addition, the induced potential can be eliminated, and the device and the person are superimposed due to the induced potential Hazard.

The use of a compact circular conductor water-blocking structure, its larger size, wider coverage, higher coefficient pressed, in particular, the maximum cross-sectional area of filaments twisted 30mm ^2, the maximum cross-sectional area of 3500mm ² The compression factor is 97.5%.

The insulating layer 3 has a minimum eccentricity of not more than 1.3% and a maximum withstand voltage of 750 kV.

The armor layer 12 adopts a structure of copper wire + steel wire + copper wire, that is, a steel wire armor layer and a copper wire armor layer which are alternately connected in sequence, wherein the steel wire armor layer is coated on the sea bottom section of the cable The copper wire armor layer is wrapped in the landing section of the cable. Since the submarine cable is generally divided into a sea bottom section and a landing section, and the seabed is different from the land environment (the land temperature is high and the thermal resistance is large), in order to achieve the same current carrying capacity of the whole cable, the sea bottom section is equipped with a steel wire armor with a large thermal resistance coefficient. The landing section adopts a copper wire armor with a thermal resistance coefficient smaller than that of the steel wire, so that the current carrying capacity of the whole cable can be consistent.

The submarine cable can be used in a high-voltage environment of 750V, and the operation load monitoring and fault point positioning are performed at the same time.

The method for preparing the above-mentioned ultra-high-section high-voltage low-loss optical fiber composite submarine cable comprises the following steps:

(1) Preparing a cable core, including:

Preparing a water-blocking conductor: firstly drawing with a giant puller and annealing to obtain a monofilament, then inserting the obtained monofilament into a 127-disc stranding machine and placing it into a circular nano-mold, and then adding a water-blocking material thereto, The circular water blocking conductor is compacted by stranding; the obtained water blocking conductor has larger specification, wider coverage area and higher compression coefficient, specifically, the maximum stranded single wire cross-sectional area reaches 30 mm ² , and the maximum cross-sectional area Up to 3500mm ² , the compression coefficient is 97.5%;

Three-layer co-extrusion preparation of conductor shielding layer, insulating layer and insulating shielding layer: a vertical cross-linking production line is used, and the conductor shielding layer, the insulating layer and the insulating shielding layer are respectively extruded through three extruders, and then the conductor shielding layer, The insulating layer and the insulating shielding layer are extruded through a tapered head to obtain a three-layer co-extruded structure of the conductor shielding layer, the insulating layer and the insulating shielding layer, which ensures the eccentricity of the insulating layer and the purity of the insulation, specifically, the obtained The maximum voltage of the insulating layer is 750kV, and the minimum eccentricity is not more than 1.3%;

The closed tray eliminates the stress, the wrapping machine wraps the water blocking buffer layer, the lead machine extrudes the lead sleeve, and the extruder extrudes the outer sheath to obtain the cable core;

(2) Cable-forming: the cable cores are cross-linked by vertical cable-forming and joint-opening machines to form a central hole between the cores, and two or two tangent-cuts between the cores on any section after cable-forming contact;

(3) In the vertical cable-forming and joint-opening machine, a light-integrated unit is built into the center hole formed by the cable, and a water-blocking conductor is arranged, and then the inner liner is wrapped, armored, and finally wrapped around the outer layer. The submarine cable.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformation of the present invention and the contents of the drawings may be directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Claims

An ultra-large cross-section high-voltage low-loss optical fiber composite submarine cable comprising: a cable core, a light unit, a filler strip, and a tape, an inner liner layer, and an armor layer respectively coated on the outer side of the cable core, the light unit and the filler strip And the outer layer; wherein the cable core is composed of a water blocking conductor, a conductor shielding layer, an insulating layer, an insulating shielding layer, a water blocking buffer layer, a lead sleeve and an outer sheath from the inside to the outside; wherein There are a plurality of cable cores and stranded to form a central hole in which the light unit is placed.
The ultra-large cross-section high-voltage low-loss optical fiber composite submarine cable according to claim 1, wherein the filler strip is made of a semiconductor material and forms an equipotential with the lead sleeve and the armor layer.
The ultra-large cross-section high-voltage low-loss optical fiber composite submarine cable according to claim 1, wherein the water-blocking conductor adopts a compact circular structure, and the maximum twisted monofilament cross-sectional area is up to 30 mm 2 , and the maximum cross-sectional area is up to 3500mm 2 , the compression coefficient is 97.5%.
The ultra-large cross-section high-voltage low-loss optical fiber composite submarine cable according to claim 1, wherein the insulating layer has a minimum eccentricity of not more than 1.3% and a maximum withstand voltage of 750 kV.
The ultra-large cross-section high-voltage low-loss optical fiber composite submarine cable according to claim 1, wherein the armor layer comprises a steel wire armor layer and a copper wire armor layer which are alternately connected in sequence, wherein the wire 铠A layer is wrapped over the subsea section of the cable, and the copper wire armor layer is wrapped over the landing section of the cable.
The method for preparing an ultra-large-section high-voltage low-loss optical fiber composite submarine cable according to any one of claims 1 to 5, comprising the steps of:

(1) Preparing the cable core: comprising preparing a water-blocking conductor, three-layer co-extruding to prepare a conductor shielding layer, an insulating layer and an insulating shielding layer, eliminating the stress and then wrapping the water-blocking buffer layer, extruding the lead sleeve, and extruding the outer sheath, Obtaining the cable core;

(2) Cable-forming: cross-linking the cable cores to form a central hole between the cores, and two-to-two contact between the cores on any cross-section after the cable is formed;

(3) A light-integrating unit is built into the center hole formed by the cable, and a water-blocking conductor is disposed, and then the inner liner is wrapped, the armor is wrapped, and the outer layer is finally wrapped to obtain the submarine cable.
The method for preparing an ultra-large-section high-voltage low-loss optical fiber composite submarine cable according to claim 6, wherein in the step (1), the water-blocking conductor is prepared by first drawing with a giant puller and Annealing, obtaining a monofilament, then penetrating the monofilament into a 127-disc stranding machine and placing it into a circular nano-mold, and then adding a water-blocking material thereto, and twisting to obtain a compact circular water-blocking conductor.
The method for preparing an ultra-large-section high-voltage low-loss optical fiber composite submarine cable according to claim 6, wherein in the step (1), the three layers are co-extruded to prepare a conductor shielding layer, an insulating layer and an insulating shielding layer. The vertical cross-linking production line is used and extruded through a tapered head. The highest voltage of the obtained insulating layer is 750 kV, and the minimum eccentricity is not more than 1.3%.