CN111243787A - Bunched submarine cable and preparation method thereof - Google Patents

Abstract

The bundled submarine cable comprises a protective layer and at least three groups of three-core loops arranged in the protective layer, wherein each group of three-core loops respectively adopt different twisting intercept, and the three-core loops are symmetrically arranged on the inner side of the protective layer. The stranded three-core loop of the bunched submarine cable is integrated into a submarine cable, so that the requirements of different frequencies and different power transmission of multiple electric submersible pumps for an underwater production system or multiple generator sets for offshore new energy development are met, and different twisting intercept is adopted among the three-core loops, so that when the whole cable is formed, the crosstalk among the cores is greatly reduced, and the operation safety of terminal equipment is improved.

Description

Bunched submarine cable and preparation method thereof

Technical Field

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

Background

A cluster submarine cable power transmission technology integrates a plurality of strands of 3-core loops into one cable and simultaneously transmits electric energy with different voltage grades and different frequencies.

The existing bundling submarine cable has the following technical defects: due to the manufacturing capability of equipment, the conventional bundled submarine cable has a 3-core structure, and the utilization rate is limited in the development of marginal oil fields. Especially, in the design of dynamic submarine cables, a plurality of small-sized cluster submarine cables are often hung on one floating foundation, and collision interference is easy to occur in the operation process; when the multi-core bundled submarine cable transmits high-power electric energy, heat is easily concentrated in the J-shaped pipe, the seabed burying position and the bending reinforcing member, and overhigh temperature is generated, so that the transmission capacity is reduced. To achieve the required transmission capacity, a larger conductor cross-section is usually selected, increasing the manufacturing cost; different loops are stranded and integrated together, and due to consistent intercept, serious crosstalk problem can be caused, namely, instantaneous charge accumulation can be caused to other loops by one group of wire cores under different transmission frequencies and voltages, and normal operation of terminal equipment is influenced.

Disclosure of Invention

In view of the above, there is a need to provide a bundled undersea cable.

The technical scheme provided by the invention is as follows:

a bunched submarine cable comprises a protective layer and at least three groups of three-core loops arranged in the protective layer, wherein each group of three-core loops respectively adopt different twisting intercept distances.

Preferably, the three-core loop comprises three core units and a reinforcing wrapping belt located on the periphery of the three core units, and each core unit comprises a plurality of conductors located in the center, and an insulating layer, a metal shielding layer and a split-phase protective sheath which are sequentially wrapped on the conductors.

Preferably, the reinforcing tape and the protective layer are also filled with a plurality of filling units.

Preferably, the protective layer comprises an inner protective layer, an armor layer and an outer coating layer which are sequentially arranged from inside to outside, the armor layer is of a single-layer or multi-layer armor structure, the outer coating layer is arranged on the periphery of the armor layer, and the inner protective layer is provided with a plurality of drill holes.

Preferably, the interval between two adjacent drill holes on the inner sheath is 5-10 m.

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

Preferably, the number of the three-core circuits is not less than 3 and not more than 13.

Preferably, the twisting intercept of the three-core loop is arranged along the clockwise increment.

It is a further object of the present invention to provide a method for preparing a bundled submarine cable as described above, comprising the steps of,

the three-core loop is independently cabled, the cabled three-core loop is placed on a cabling pay-off rack as an independent unit, cabling is carried out at a twisting point according to a designed section, and a protective layer is coated on the periphery.

Preferably, in the process of cabling the three-core loop independently, the cabling gap is filled with a filling unit and is covered with a reinforcing tape.

The stranded three-core loop of the bunched submarine cable is integrated into a submarine cable, so that the requirements of different frequencies and different power transmission of multiple electric submersible pumps for an underwater production system or multiple generator sets for offshore new energy development are met, and different twisting intercept is adopted among the three-core loops, so that when the whole cable is formed, the crosstalk among the cores is greatly reduced, and the operation safety of terminal equipment is improved.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is an overall schematic view of a bundled undersea cable in an embodiment of the invention.

Fig. 2 is an overall schematic view of a three-group three-core loop bundled submarine cable according to the present invention.

Fig. 3 is an overall schematic view of four sets of three-core loop bundled submarine cables according to the present invention.

Fig. 4 is an overall schematic view of five sets of three-core loop bundled submarine cables according to the present invention.

Fig. 5 is an overall schematic view of seven sets of three-core loop bundled undersea cables according to the present invention.

Fig. 6 is an overall schematic view of nine sets of three-core loop bundled undersea cables according to the present invention.

Fig. 7 is an overall schematic diagram of a three-core loop according to an embodiment of the invention.

Description of reference numerals:

bunched submarine cable	100
		Protective layer	10
Inner protective layer	11
		Drilling holes	111
Armor layer	13
		Outer coating layer	15
Three-core loop	30
		Core unit	31
Conductor	311
		Conductor shielding layer	312
Insulating layer	313
		Insulating shielding layer	314
Metal shielding layer	315
		Phase-splitting protective sheath	317
Reinforced belting	33
		Filling unit	50
Light sheetYuan	70

The following detailed description further illustrates embodiments of the invention in conjunction with the above-described figures.

Detailed Description

So that the manner in which the above recited objects, features and advantages of embodiments of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth to provide a thorough understanding of embodiments of the invention, and the described embodiments are merely a subset of embodiments of the invention, rather than a complete embodiment. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the embodiments of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of the present invention belong. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the invention.

Referring to fig. 1, a bundled submarine cable 100 includes a protective layer 10, at least three sets of three-core loops 30, a filling unit 50 and a plurality of optical units 70, the protective layer 10 covers the periphery of the three-core loops 30 to provide an outer layer protection for the bundled submarine cable 100, the filling unit 50 and the optical units 70 are filled between gaps of the three-core loops 30, and the twisting intercept of each three-core loop 30 is different.

Referring to fig. 1, the protective layer 10 includes an inner protective layer 11, an armor layer 13 and an outer coating layer 15, which are sequentially disposed from inside to outside, and in one embodiment, the inner protective layer 11 is a polyethylene sheath to improve structural roundness and lateral pressure resistance. The inner sheath 11 is further provided with a drill hole 111, and the drill hole 111 is used for facilitating seawater to be poured into gaps of the three-core loop 30, so that seawater can rapidly take away heat collection in the three-core loop 30, and meanwhile, the current-carrying capacity of the bundled submarine cable 100 is improved. 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 an embodiment, the armor layer 13 is a single-layer armor steel wire layer, and in other embodiments, the armor layer 13 may also be provided as a multi-layer armor structure. The sheath 15 covers the outer periphery of the armor 13, and in one embodiment, the sheath 15 is a polypropylene rope wrapped around the outer periphery of the armor 13.

Referring to fig. 1, in one embodiment, the three-core circuits 30 are arranged in thirteen groups, nine groups of the three-core circuits 30 are arranged on the inner side of the protective layer 10 along a circumferential array, and 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 the circumferential array. Referring to fig. 2 to 6, in other embodiments, the number of groups of the three-core circuits 30 may also be set to any one of 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, and 13, the three-core circuits 30 are sequentially filled inside the protective layer 10, and the three-core circuits 30 are symmetrically disposed inside the protective layer 10. As in one embodiment, the twist intercept of the three-core loop 30 may be arranged to be incrementally arranged in a clockwise direction.

Referring to fig. 7, the three-core loop 30 includes three core units 31 and a reinforcing tape 33 located at the periphery of the core units 31, and each core unit 31 includes a conductor 311 located at the center, and a conductor shielding layer, an insulating layer 313, an insulating shielding layer 314, a metal shielding layer 315, and a split-phase protection sheath 317 sequentially covering the periphery of the conductor 311 from inside to outside. The conductor 311 is used for transmitting electric energy, in one embodiment, the conductor 311 is a copper conductor, and in other embodiments, the conductor 311 may also be an aluminum conductor. The metal shielding layer 315 is used to reduce the outer diameter of the wire core unit 31, reduce the minimum bending radius of the submarine cable, and radially block water for the wire core unit 31. In one embodiment, the metal shielding layer 315 is a copper-plastic composite tape.

Referring to fig. 1 and 2, the filling unit 50 and the optical unit 70 are both disposed inside the protective layer 10, and the filling unit 50 is used for filling a cabling gap to ensure that the outer diameter is consistent after cabling. In one embodiment, the filling unit comprises a polyethylene rod and a profiled filler strip.

The preparation method comprises the following steps:

the three core units 31 are used as basic units of the three-core loop 30 to be wound, and a copper-plastic composite belt is wrapped under the split-phase protective sheath 317 of each core unit 31 and used as a metal shielding layer 315 to cover the periphery of the core unit 31, in one embodiment, the copper-plastic composite belt is a two-sided plastic layer, and in the extrusion molding process of the split-phase protective sheath 317, the copper-plastic composite belt is bonded and fused with the plastic layer of the copper-plastic composite belt to improve the radial water resistance; in the cabling process of the three-core loop 30, the cabling gap is filled through the filling unit 50 to keep the outer diameter of the cabled three-core loop 30 consistent, and the three-core loop 30 is wrapped by the reinforcing wrapping belt 33 after cabling is finished to prevent the next procedure from being worn out.

And (3) placing the cabled three-core loop 30 as an independent unit on each cabling pay-off stand, cabling at a twisting point according to a designed section, and twisting the optical unit 70 and the filling unit 50 with the three-core loop 30 simultaneously in the cabling process and filling the optical unit and the filling unit into gaps of the three-core loop 30.

After the bunched submarine cables 100 are cabled, wrapping the bunched submarine cables by using a reinforcing wrapping tape 33, and extruding a polyethylene sheath at the periphery of the reinforcing wrapping tape 33 to form an inner protection layer 11 for package protection;

the inner sheath 11 is drilled every 5-10m to form the drilled holes 111, so that during construction, seawater can penetrate into the inner sheath 11, balance of internal and external pressure is met, weight of the bunched submarine cable 100 in water is increased, and stability in seawater is improved.

The single-layer or chopped armor structure is adopted on the periphery of the bunched submarine cable 100, and finally, the outer coating layer 15 is prepared by winding and binding a polypropylene rope, so that the preparation of the bunched submarine cable 100 is realized.

In the bundled submarine cable 100, the three-core loops 30 of each group have different twisting intercept distances, so that when the bundled submarine cable 100 forms a whole cable, crosstalk between the core units 31 is greatly reduced, and the operation safety of terminal equipment is improved.

Although the embodiments of the present invention have been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the embodiments of the present invention.

Claims (10)

1. The utility model provides a submarine cable tied in a bundle, includes the protective layer and sets up in at least three group three-core return circuits in the protective layer which characterized in that: and each group of three-core loops respectively adopt different twisting intercept.

2. The bundled submarine cable according to claim 1, wherein: the three-core loop comprises three core units and reinforcing wrapping belts arranged on the peripheries of the three core units, and each core unit comprises a plurality of conductors positioned in the center, and an insulating layer, a metal shielding layer and a split-phase protection sheath which are sequentially wrapped on the conductors.

3. The bundled submarine cable according to claim 2, wherein: the reinforcing wrapping tape and the protective layer are filled with a plurality of filling units.

4. The bundled submarine cable according to claim 1, wherein: the protective layer comprises an inner protective layer, an armor layer and an outer coating layer which are sequentially arranged from inside to outside, the armor layer is of a single-layer or multi-layer armor structure, the outer coating layer is arranged on the periphery of the armor layer, and a plurality of drill holes are formed in the inner protective layer.

5. The bundled submarine cable according to claim 4, wherein: and the interval between two adjacent drill holes on the inner protective layer is 5-10 m.

6. The bundled submarine cable according to claim 1, wherein: the light unit is arranged on the inner side of the protective layer along the circumference array.

7. The bundled submarine cable according to claim 1, wherein: the number of the three-core loops is more than or equal to 3 and less than or equal to 13.

8. The bundled submarine cable according to claim 1, wherein: the twisting intercept of the three-core loop is arranged along the clockwise increasing direction.

9. A method of manufacturing a bundled submarine cable for use in manufacturing a bundled submarine cable according to any of claims 1 to 8, characterized in that: comprises the following steps of (a) carrying out,

the three-core loop is independently cabled, the cabled three-core loop is placed on a cabling pay-off rack as an independent unit, cabling is carried out at a twisting point according to a designed section, and a protective layer is coated on the periphery.

10. The method of making a bundled submarine cable according to claim 9, wherein: in the independent cabling process of the three-core loop, the cabling gap is filled by adopting a filling unit and is coated by a reinforcing wrapping tape.

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