WO2021168947A1 - Bundled submarine cable and manufacturing method therefor - Google Patents

Abstract

A bundled submarine cable and a manufacturing method therefor. The bundled submarine cable (100) comprises a protective layer (10) and at least three groups of three-core return circuits (30) disposed in the protective layer, each group of three-core return circuits uses different twisting intercepts, and the three-core return circuits are symmetrically disposed on the inner side of the protective layer. Multiple strands of three-core return circuits of the bundled submarine cable are integrated into a submarine cable, satisfying the requirements of multiple electric submersible pumps for an underwater production system or multiple generator sets for offshore new energy development for power transmission at different frequencies and different powers; and the whole cable is formed by using different twisting intercepts among the three-core return circuits, so that crosstalk among wire cores is greatly reduced, and the operation safety of a terminal device is improved.

Description

Clustered submarine cable and preparation method thereof Technical field

The invention relates to the technical field of submarine cables, in particular to a clustered submarine cable and a preparation method thereof.

Background technique

The clustered submarine cable power transmission technology integrates multiple 3-core circuits into one cable, and simultaneously transmits electric energy of different voltage levels and different frequencies.

The existing cluster submarine cable has the following technical defects: limited by the equipment manufacturing capacity, the currently commonly used cluster submarine cable has a 3-core structure, and the utilization rate is limited in the development of marginal oilfields. Especially in dynamic submarine cable design, multiple small-size clustered submarine cables are often suspended on a floating foundation, which is prone to collision and interference during operation; when multi-core clustered submarine cables transmit high-power electric energy, they are buried in the J-tube and seabed. , The heat in the bending reinforcement is easy to concentrate, resulting in excessively high temperature, thereby reducing the transmission capacity. In order to achieve the required transmission capacity, a larger conductor cross-section is usually selected, which increases the manufacturing cost; different loops are twisted and integrated, and because the intercepts are the same, it will cause serious crosstalk problems, that is, one set of cores is at different transmission frequencies. , Voltage will cause instantaneous charge accumulation in other groups of circuits, which will affect the normal operation of terminal equipment.

Summary of the invention

In view of the above, it is necessary to provide a clustered submarine cable.

The technical scheme provided by the present invention is:

A clustered submarine cable includes a protective layer and at least three groups of three-core circuits arranged in the protective layer, and each group of the three-core circuits adopts different stranding intercepts.

Preferably, the three-core loop includes three core units and a reinforcing tape located on the outer periphery of the three core units, and each of the core units includes a plurality of conductors located in the center and sequentially wrapped around the conductors The insulating layer, metal shielding layer and phase separation protective sheath on the upper part.

Preferably, the reinforced strap and the protective layer are also filled with several filling units.

Preferably, the protective layer includes an inner protective layer, an armor layer, and an outer covering layer arranged in sequence from the inside to the outside. On the outer circumference of the armor layer, a number of drill holes are opened on the inner protective layer.

Preferably, the interval between two adjacent boreholes on the inner protective layer is 5-10 m.

Preferably, a number of light units are further arranged in the protective layer, and the light units are arranged in a circumferential array on the inner side of the protective layer.

Preferably, the number of the three-core circuits is greater than or equal to 3 and less than or equal to 13.

Preferably, the twisted intercept of the three-core loop is set in an increasing clockwise direction.

Another object of the present invention is to provide a method for preparing a clustered submarine cable, which is used to prepare the above-mentioned clustered submarine cable, including the following steps:

First, the three-core circuit is individually cabled, and the cabled three-core circuit is placed on the cable pay-off rack as an independent unit, and the stranding point is cabled according to the design section, and the outer circumference is covered with a protective layer.

Preferably, during the separate cabling process of the three-core circuit, the cabling gap is filled with a filling unit and covered with a reinforced tape.

The multi-strand three-core loop of the above-mentioned clustered submarine cable is integrated into a submarine cable to meet the requirements of multiple electric submersible pumps for underwater production systems or multiple generator sets for the development of new energy on the sea with different frequencies and different powers. Different stranding intercepts are used between the core loops. When forming the entire cable, the crosstalk between the cores will be greatly reduced, and the operation safety of the terminal equipment will be improved.

Description of the drawings

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

Fig. 1 is an overall schematic diagram of a bundled submarine cable in an embodiment of the present invention.

Figure 2 is an overall schematic diagram of three groups of three-core loop bundled submarine cables in the present invention.

Figure 3 is an overall schematic diagram of four groups of three-core loop bundled submarine cables in the present invention.

Figure 4 is an overall schematic diagram of five groups of three-core loop bundled submarine cables in the present invention.

Fig. 5 is an overall schematic diagram of seven groups of three-core loop bundled submarine cables in the present invention.

Fig. 6 is an overall schematic diagram of nine groups of three-core loop bundled submarine cables in the present invention.

Fig. 7 is an overall schematic diagram of a three-core circuit in an embodiment of the present invention.

Description of reference signs:

Bundled submarine cable	100
The protective layer	10
Inner sheath	11
drilling	111
Armor layer	13
Outer layer	15
Three core circuit	30
Core unit	31
conductor	311
Conductor shield	312
Insulation	313
Insulation shield	314
Metal shield	315
Phase separation protective sheath	317
Enhanced strap	33
Filling unit	50
Light unit	70

The following specific implementations will further illustrate the embodiments of the present invention in conjunction with the above-mentioned drawings.

Detailed ways

In order to more clearly understand the above objectives, features, and advantages of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific implementations. It should be noted that, in the case of no conflict, the features in the embodiments of the present application can be combined with each other.

In the following description, many specific details are set forth in order to fully understand the embodiments of the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the embodiments of the present invention.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the embodiments of the present invention. The terminology used in the specification of the present invention herein is only for the purpose of describing specific embodiments, and is not intended to limit the embodiments of the present invention.

Please refer to FIG. 1, a bundled submarine cable 100, including a protective layer 10, at least three groups of three-core circuits 30, a filling unit 50 and a number of light units 70, the protective layer 10 is wrapped around the outer periphery of the three-core circuit 30 , Used to provide outer protection for the clustered submarine cable 100, the filling unit 50 and the optical unit 70 are filled between the gaps of the three-core circuit 30, and the stranded intercept of each three-core circuit 30 different.

Please refer to FIG. 1, the protective layer 10 includes an inner protective layer 11, an armor layer 13 and an outer sheath 15 which are sequentially arranged from the inside to the outside. In one embodiment, the inner protective layer 11 is a polyethylene sheath. In order to improve the structural roundness and resistance to lateral pressure. The inner sheath 11 is also provided with a borehole 111, which is used to facilitate the filling of seawater into the gap of the three-core circuit 30, so that the seawater can quickly take away the heat collection in the three-core circuit 30, and at the same time improve The current carrying capacity of the clustered submarine cable 100. In one embodiment, the distance between two adjacent boreholes 111 is 5-10 m. The armor layer 13 is used to improve the circumferential tensile strength and the lateral extrusion strength. In one embodiment, the armor layer 13 is a single-layer armored steel wire layer. In other embodiments, the armor The layer 13 can also be provided as a multilayer armor structure. The outer drape 15 is wrapped around the outer circumference of the armor layer 13, and the outer drape 15 is used to fasten the armor layer 13. In one embodiment, the outer drape 15 is a polypropylene rope , The polypropylene rope is tied around the outer circumference of the armor layer 13.

1, in one embodiment, the three-core circuits 30 are arranged in thirteen groups, and nine of the thirteen groups of three-core circuits 30 are arranged in a circumferential array on the inner side of the protective layer 10, The other four groups of the three-core circuits 30 are arranged in the center of the nine groups of three-core circuits 30 arranged in a circular array. 2-6, in other embodiments, the number of groups of the three-core circuit 30 can also be set to any of 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, and 13. A numerical value, the three-core circuit 30 is filled in the inner side of the protective layer 10 in an orderly manner, and the three-core circuit 30 is symmetrically arranged on the inner side of the protective layer 10. As in one embodiment, the twist intercept of the three-core circuit 30 can be set to increase in a clockwise direction.

Referring to FIG. 7, the three-core circuit 30 includes three core units 31 and a reinforced tape 33 located on the outer periphery of the core unit 31. Each core unit 31 includes a conductor 311 located in the center and a conductor 311 located in the center. The conductor shielding layer, the insulating layer 313, the insulating shielding layer 314, the metal shielding layer 315, and the phase-separated protective sheath 317 are sequentially wrapped around the outer periphery of the conductor 311. The conductor 311 is used to transmit electric energy. In one embodiment, the conductor 311 is a copper conductor. In other embodiments, the conductor 311 may also be an aluminum conductor. Wherein, the metal shielding layer 315 is used to reduce the outer diameter of the core unit 31, reduce the minimum bending radius of the submarine cable, and play a role of radial water blocking for the core unit 31. In one embodiment, the metal shielding layer 315 is a copper-plastic composite tape.

1 and 2, the filling unit 50 and the optical unit 70 are both arranged on the inner side of the protective layer 10, and the filling unit 50 is used to fill the cable gap to ensure that the outer diameter of the cable is maintained Unanimous. In one embodiment, the filling unit includes a polyethylene rod and a special-shaped filling strip.

Preparation:

Three core units 31 are used as the basic units of the three-core circuit 30 to be wound, and a copper-plastic composite tape is wound under the phase separation protective sheath 317 of each core unit 31, and the copper-plastic composite tape is used as a metal The shielding layer 315 covers the outer circumference of the core unit 31. In one embodiment, the copper-plastic composite tape is a double-sided plastic layer. The plastic layer of the composite tape is bonded and fused to improve the radial water resistance; during the cable formation process of the three-core circuit 30, the cable gap is filled by the filling unit 50 to maintain the same outer diameter after the cable is formed. After the loop 30 is cabled, it is covered with a reinforced strap 33 to prevent the next process from being worn out.

Put the three-core circuit 30 after cabling as a separate unit on each cabling pay-off rack, and perform cabling according to the design section at the twisting point. During the cabling process, the optical unit 70 and the filling unit 50 are connected to the three-core circuit 30 is twisted at the same time and stuffed into the gap of the three-core circuit 30.

After the bundled submarine cable 100 is cabled, the reinforced tape 33 is used for wrapping, and a polyethylene sheath is extruded on the outer periphery of the reinforced tape 33 to form an inner sheath 11 for overall protection;

Drill holes 111 for the inner sheath 11 every 5-10m so that seawater can penetrate into the inner sheath 11 during construction to meet the internal and external pressure balance. At the same time, the weight of the cluster submarine cable 100 in the water is increased to lift the seawater. Stable performance.

A single-layer or chopped armored structure is used on the outer periphery of the cluster submarine cable 100, and finally, the preparation of the outer sheath 15 is achieved by using polypropylene ropes to wind and tie, so as to realize the preparation of the cluster submarine cable 100.

The above-mentioned clustered submarine cable 100 adopts different strand intercepts through each group of three-core circuits 30, so that when the clustered submarine cable 100 forms a complete cable, the crosstalk between the core units 31 will be greatly reduced, and the operation of the terminal equipment will be improved. Safety.

The above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention and not to limit them. Although the embodiments of the present invention are described in detail with reference to the above preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the embodiments of the present invention can be compared. Modifications or equivalent replacements of the solutions should not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A clustered submarine cable includes a protective layer and at least three groups of three-core circuits arranged in the protective layer, and is characterized in that each group of the three-core circuits adopts different stranding intercepts.
2. The bundled submarine cable according to claim 1, wherein the three-core loop includes three core units and a reinforced tape located on the periphery of the three core units, and each of the core units includes A number of conductors in the center and an insulating layer, a metal shielding layer and a phase-separated protective sheath that are sequentially wrapped on the conductors.
3. The bundled submarine cable according to claim 2, characterized in that: the reinforced tape and the protective layer are also filled with a number of filling units.
4. The clustered submarine cable according to claim 1, wherein the protective layer includes an inner protective layer, an armor layer, and an outer sheath sequentially arranged from the inside to the outside, and the armor layer is a single layer or multiple layers of armor. The outer covering layer is arranged on the outer periphery of the armor layer, and a number of drill holes are opened on the inner protective layer.
5. The clustered submarine cable according to claim 4, wherein the interval between two adjacent boreholes on the inner sheath is 5-10m.
6. The clustered submarine cable according to claim 1, wherein a plurality of light units are further arranged in the protective layer, and the light units are distributed in a circumferential array on the inner side of the protective layer.
7. The clustered submarine cable according to claim 1, wherein the number of the three-core circuits is greater than or equal to 3 and less than or equal to 13.
8. The clustered submarine cable according to claim 1, wherein the twisted intercept of the three-core loop is set in increments in a clockwise direction.
9. A method for preparing a bundled submarine cable for preparing the bundled submarine cable according to any one of claims 1-8, characterized in that it comprises the following steps:

   First, the three-core circuit is individually cabled, and the cabled three-core circuit is placed on the cable pay-off rack as an independent unit, and the stranding point is cabled according to the design section, and the outer circumference is covered with a protective layer.
10. The method for preparing a bundled submarine cable according to claim 9, characterized in that: during the separate cabling process of the three-core loop, the cabling gap is filled with a filling unit and covered with a reinforced tape.

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