CN111554435B - Multi-core direct-current submarine cable and production method thereof - Google Patents
Multi-core direct-current submarine cable and production method thereof Download PDFInfo
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- CN111554435B CN111554435B CN202010406955.2A CN202010406955A CN111554435B CN 111554435 B CN111554435 B CN 111554435B CN 202010406955 A CN202010406955 A CN 202010406955A CN 111554435 B CN111554435 B CN 111554435B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/1895—Internal space filling-up means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/02—Stranding-up
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/221—Sheathing; Armouring; Screening; Applying other protective layers filling-up interstices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
- H01B13/2613—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by longitudinal lapping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/14—Submarine cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/005—Power cables including optical transmission elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
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Abstract
The invention provides a multi-core direct current submarine cable which comprises two same polarity electric units, an additional electric unit assembly, a plurality of filling strips, a wrapping tape, a cushion layer, an armor layer and an outer protective layer, wherein the outer diameter of the section of the additional electric unit assembly is the same as that of the section of each polarity electric unit; the two polarity electric units and the additional electric unit assembly are twisted together, and a wrapping belt, a cushion layer, an armor layer and an outer protective layer are sequentially wrapped outside the two polarity electric units; and a plurality of filling strips are arranged in gaps among the two polar electric units, the additional electric unit assembly and the wrapping tape. The multi-core direct-current submarine cable is beneficial to saving laying cost and laying time and can effectively solve the problem of roundness of electric units with different outer diameters. The invention also provides a production method of the multi-core direct current submarine cable, which is characterized in that the two polarity electric units and the additional electric unit assembly are twisted in the vertical direction by means of gravity, so that the twisting of the multi-core direct current submarine cable is stably and efficiently realized.
Description
Technical Field
The invention relates to the technical field of submarine cables, in particular to a multi-core direct current submarine cable and a production method thereof.
Background
The direct current submarine cable is suitable for being connected with current conversion equipment at two ends of a direct current transmission system, a complete underwater or land transmission line system is built by matching submarine cable accessories, the direct current submarine cable is frequently used in large-capacity and long-distance transmission projects, the section of a required conductor is large, and therefore the direct current submarine cable in the prior art is mainly designed into a single-core submarine cable structure. The submarine cable in the prior art adopts a large-section single-core structure, so that the engineering cost is high, the period is long, and the total cost is high. In addition, single core direct current submarine cable need pack the optical unit in the armor when compound optical fiber, or increase the optic fibre filling layer alone, places and has increased the impaired risk of optic fibre unit in the armor, increases the optic fibre filling layer alone and can additionally increase direct current submarine cable raw and other materials cost to owing to increase thermal insulation material and reduce submarine cable transport capacity.
In general, a pseudo-bipolar direct-current submarine cable power transmission system is a loop formed by two polar direct-current submarine cables, and once one of the two polar direct-current submarine cables fails, the whole loop cannot normally operate; a backflow submarine cable is added in a true bipolar direct-current submarine cable power transmission system, three submarine cables form a loop, when a certain polar submarine cable fails, an intact polar submarine cable can form the loop by means of the backflow submarine cable, and half of transmission capacity is kept. At present, in order to avoid the problem that the whole system stops running after one of two polarity submarine cables of a pseudo-bipolar system fails, a solution scheme of additionally adding a standby polarity submarine cable is adopted, so that the original polarity submarine cable is switched to the standby submarine cable to form a loop again after one of the two polarity submarine cables fails.
In the construction process of the direct-current submarine cable power transmission system, the main cost investment comprises three aspects of investment of a converter system, a submarine cable body and submarine cable construction. The key content in the construction of the submarine cable is the laying of the submarine cable. Due to the conventional single-core structural characteristics of the direct current submarine cables, two or three direct current submarine cables in each loop need to be laid independently, so that the construction period and the cost input of a construction ship can be increased. In order to solve the problem of overhigh cost, the existing scheme in the field is to use a construction ship for assembling two independent turntables, lay two single-core direct current submarine cables simultaneously, bind the cables during laying and finish construction at one time so as to save time and cost. However, there has been no successful experience or case for three single core dc submarine cables. In addition, the binding and laying scheme has high requirements on the construction ship, the special multi-turn-plate construction ship is required to complete the transformation and the upgrade of auxiliary equipment, the investment cost is high, and the large-range propulsion is not facilitated.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a multi-core dc submarine cable, which adopts a structure in which two electrical units with the same polarity and an additional electrical unit assembly are integrated into a cable and are sheathed in an armor, the outer diameter of the cross section of the additional electrical unit assembly is the same as that of the cross section of the polarity electrical unit, and a filler strip is arranged between the internal polarity electrical unit and the additional electrical unit assembly, so as to reduce material cost and laying cost, and ensure the roundness of the cable core with different sizes.
Another object of the present invention is to provide a stranding apparatus for a multi-core dc cable, which realizes stable operation of the stranding apparatus for a multi-core dc cable by providing a weight on a turntable.
The invention also aims to provide a production method of the multi-core direct current submarine cable, and the multi-core direct current submarine cable stranding device is adopted to complete stranding of the two polarity electric units and the additional electric unit assemblies in the vertical direction by means of gravity, so that stranding of the multi-core direct current submarine cable is stably and efficiently realized.
In order to achieve the purpose, the invention provides a multi-core direct current submarine cable which comprises two same polarity electrical units, an additional electrical unit assembly, a plurality of filling strips, a wrapping tape, a cushion layer, an armor layer and an outer protective layer, wherein the outer diameter of the cross section of the additional electrical unit assembly is the same as that of the polarity electrical units; the two polar electric units and the additional electric unit assembly are twisted together, and the wrapping belt, the cushion layer, the armor layer and the outer protective layer are sequentially wrapped outside the polar electric units and the additional electric unit assembly; and a plurality of filling strips are arranged in the gap between the two polar electric units, the additional electric unit assembly and the wrapping tape.
Preferably, the additional electrical unit assembly comprises an additional electrical unit and at least one additional filler strip disposed at a side of the additional electrical unit.
Preferably, the additional electrical unit assembly comprises two semicircular additional filler strips, the two additional filler strips are arranged on two sides of the additional electrical unit, and the two additional filler strips form a near-circumference shape.
Preferably, two additional filler strips are matched with the additional electric units to form a circumference, and gaps are reserved at the upper end and the lower end of the circumference.
Preferably, the additional filler strip is located on a side of the additional electrical unit remote from both of the polar electrical units or between the additional electrical unit and both of the polar electrical units.
Preferably, when the multi-core dc submarine cable is applied to a pseudo-bipolar dc transmission system, and the transmission capacity of the additional electrical unit assembly and the transmission capacity of the polar electrical unit assembly are required to be the same, the additional electrical unit assembly comprises an additional electrical unit with the same structure as the polar electrical unit, and the cross-sectional area of the conductor of the additional electrical unit is the same as that of the polar electrical unit.
Preferably, when the multi-core direct current submarine cable is applied to a true bipolar direct current transmission system, the additional electrical unit assembly comprises an additional electrical unit which has the same structure as the polarity electrical unit, and the conductor cross-sectional area of the additional electrical unit is the same as that of the polarity electrical unit.
Preferably, the additional electrical unit assembly comprises three cabled additional electrical units, and a filling bar is arranged inside the additional electrical units.
The invention provides a stranding device of a multi-core direct-current submarine cable, which is used for stranding the multi-core direct-current submarine cable and comprises a first platform, a second platform, a counterweight platform, a middle shaft, two polarity electric unit rotating discs, an additional electric unit rotating disc, at least one auxiliary rotating disc, a first traction wrapping assembly, a first stranding die, a second traction wrapping assembly, a second stranding die and a steering wheel; the two polarity electric units are respectively arranged in the two polarity electric unit turntables; the auxiliary turntable is arranged on the side part of the additional electric unit turntable; the counterweight platform, the first platform and the second platform are sequentially arranged in parallel from bottom to top, the middle shaft is perpendicular to the middle of the counterweight platform, and the two polar electric unit rotating discs and the additional electric unit rotating disc are uniformly arranged on the counterweight platform; the first traction wrapping assembly is arranged on the first platform, and the bottom of the first traction wrapping assembly is provided with the first twisting die; the second traction wrapping assembly is arranged on the second platform, and the bottom of the second traction wrapping assembly is provided with the second twisting die; the steering wheel is arranged on the second platform and is in butt joint with the second traction wrapping assembly; a plurality of counter weights are arranged on the counter weight plate at positions corresponding to the positions of the additional electric unit turnplates vertically; and a counterweight is arranged on one side of the first platform, which is not provided with the first traction wrapping assembly.
The invention provides a method for producing a multi-core direct current submarine cable, which adopts a stranding device of the multi-core direct current submarine cable and comprises the following steps:
(A) the two polar electric unit turntables and the additional electric unit turntable rotate around the central shaft anticlockwise at an angular speed omega 1; the polar electric unit turntable, the additional electric unit turntable and the auxiliary turntable synchronously rotate clockwise at an angular velocity omega 2, the first platform synchronously rotates anticlockwise at an angular velocity omega 3, and omega 1 is omega 2 is omega 3;
(B) synchronously, the first traction wrapping assembly vertically pulls the additional electric unit or the additional electric unit and the additional filling strip upwards at a speed v1, the additional electric unit assembly is converged at the first twisting die and is firmly bundled, the second traction wrapping assembly vertically pulls the additional electric unit assembly and the two polarity electric units upwards at a speed v2, the additional electric unit assembly and the two polarity electric units are converged at the second twisting die to form an integral circular structure, and v1 is equal to v 2;
(C) synchronously, the whole round structure is filled and rounded by the filling strips, and is firmly bound by the second traction wrapping assembly, so that the bundling by the wrapping belt is completed;
(D) and after the bundling of the wrapping tape is finished, the subsequent armor and outer protective layer production procedures are carried out through the steering wheel.
Compared with the prior art, the multi-core direct current submarine cable and the production method thereof disclosed by the invention have the advantages that: the multi-core direct current submarine cable saves the required raw material investment under the design of the same conductor section and insulation structure, and has better market value; the method is beneficial to laying a single-loop direct-current submarine cable line at one time in the submarine cable engineering construction process, and saves a large amount of laying cost; the roundness problem of the electric units with different outer diameters can be effectively solved; the stranding device of the multi-core direct current submarine cable improves the stability of the stranding device by arranging the counterweight turntable and the counterweight; by adopting the method for producing the multi-core direct-current submarine cable, the stable stranding of the multi-core direct-current submarine cable can be realized, and the production efficiency can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic cross-sectional view of a multi-core dc submarine cable according to the present invention.
Fig. 2 is a schematic cross-sectional view of a polar electric unit of a multi-core dc submarine cable according to the present invention.
Fig. 3 is a schematic cross-sectional view of an additional electrical unit assembly of a multi-core dc submarine cable according to the present invention.
Fig. 4 is a schematic cross-sectional view of a first variant of the multi-core dc submarine cable according to the present invention.
Fig. 5 is a schematic cross-sectional view of a second variant of the multi-core dc submarine cable according to the present invention.
Fig. 6 is a schematic cross-sectional view of a third variant of the multi-core dc submarine cable according to the present invention.
Fig. 7 is a schematic structural diagram of a stranding apparatus for a multi-core dc submarine cable according to the present invention.
Fig. 8 is a top view illustrating the rotation of the turntable of the stranding device of the multi-core dc submarine cable according to the present invention.
Fig. 9 is a top view of the rotation of the turntable of a variation of the stranding device of a multi-core dc submarine cable according to the present invention.
Fig. 10 is a flow chart of a method for producing a multi-core dc submarine cable according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the multi-core dc submarine cable according to the present invention includes two electrical units 11, 12 with the same polarity, an additional electrical unit assembly 13, a plurality of optical units 14, a plurality of filler strips 15, a tape 161, a pad layer 162, an armor layer 163, and an outer sheath 164. Wherein, the section outer diameter of the additional electric unit assembly 13 is the same as that of the polar electric units 11 and 12, so as to improve the roundness after cabling. The two polar electric units 11 and 12 are twisted together with the additional electric unit assembly 13, and the wrapping tape 161, the cushion layer 162, the armor layer 163 and the outer protective layer 164 are sequentially wrapped outside. The plurality of light units 14 are disposed in the gaps between the two polar electric units 11, 12, the additional electric unit assembly 13 and the tape 161, and the gaps between the two polar electric units 11, 12, the additional electric unit assembly 13 and the tape 161 are filled with a plurality of filling strips 15.
As shown in fig. 2, the polarity electrical unit 11 includes a conductor 111, an inner semi-conductive shielding layer 112, an extrusion insulation layer 113, an outer semi-conductive shielding layer 114, a semi-conductive water blocking layer 115, a metal shielding layer 116, and a plastic sheath layer 117, which are sequentially wrapped from inside to outside. The polarity electrical unit 12 is the same size as the polarity electrical unit 11. The main functions of the polarity electrical units 11 and 12 are to form a dc power transmission circuit, to play a role in transmitting electric energy in a normal operation state, and to put the additional electrical unit assembly 13 in an inoperative state when the polarity electrical units 11 and 12 are in a normal operation state.
The additional electrical unit assembly 13 includes an additional electrical unit 131. In a true bipolar direct current transmission system, the main function of the additional electric unit 131 is to bear the backflow current for one polarity electric unit after the other polarity electric unit fails, and the invention designs the conductor cross section (marked as S) of the additional electric unit 131Attachment(s)) Cross section of conductor with polar electric unit (denoted as S)Polarity) Same, i.e. SAttachment(s)＝SPolarity. Preferably the thickness of the insulating layer of the additional electrical unit (denoted d)Attachment(s)) Thickness of insulating layer for polar electric unit (denoted as d)Polarity) 30% of (i), i.e. dAttachment(s)＝30％×dPolarity. In a pseudo-bipolar system, the main function of the additional electrical unit 131 is to re-loop with one polarity electrical unit after the other polarity electrical unit fails to ensure that the system can operate normally, where the conductor cross-section area and the insulation layer thickness of the additional electrical unit 131 are designed according to the level of the transport capacity that the additional electrical unit needs to retain, and when the transport capacity that the additional electrical unit 131 can reach is the same as that of the polarity electrical unit, S is the sameAttachment(s)＝SPolarityWhile d isAttachment(s)＝dPolarityAt this time, the structural composition and size of the additional electric unit are completely consistent with those of the polarity electric unit.
In a pseudo-bipolar system, when the system sets the level of the transport capacity reserved by the additional electrical unit 131 to be smaller than the level of the transport capacity of the polarity electrical units 11, 12, the additional electrical unit 131 is not in accordance with the size of the polarity electrical units 11, 12, and the additional assembly 131 needs to add an additional filler strip to keep the outer diameter of the cross section of the additional electrical unit assembly 13 the same as the outer diameter of the cross section of the polarity electrical units 11, 12. As shown in fig. 3, the additional electrical unit assembly 13 includes two semicircular additional filler strips 132. Two additional filler strips 132 are arranged at two sides of the additional electric unit 131, the two additional filler strips 132 form an approximate circumference shape, D shown in fig. 3 is an approximate circumference outer diameter, and D is the same as the outer diameter of the polar electric units 11 and 12, so that the roundness of the submarine cable covered by the submarine cable after cabling is improved by matching the two polar electric units. In order to make the two additional filler strips 132 still have deformation margin after combination, the two additional filler strips 132 are designed to form a circumference together with the additional electrical unit 131, and then a certain gap is left at each of the upper and lower ends, i.e. d in fig. 3, preferably d is 10 mm. In order to avoid the deformation of the additional electric unit 131 caused by the excessive tightening pressure generated by the two additional filling bars 132 on the additional electric unit 131 during the twisting process, the inner side radian of the additional filling bars 132 is designed according to the outer diameter of the additional electric unit 131, and the fitting angle alpha between the inner 132 radian of the two additional filling bars and the outer diameter of the additional electric unit 131 is 120 degrees.
As shown in fig. 4, a first variant of the multi-core dc submarine cable according to the present invention is distinguished in that the additional electrical unit assembly 13A includes an additional electrical unit 131A and an additional filler 132A, the additional filler 132A is located on a side of the additional electrical unit 131A away from the polar electrical units 11 and 12, the additional electrical unit 131A is in contact with the additional filler 132A and the two polar electrical units 11 and 12, and the three points are stable in position, so that there is no mandatory requirement for the contact area and angle between the filler and the additional electrical unit 131A, and both sides of the additional filler 132A are required to be compressed below by the adjacent filler 15, thereby ensuring that there is no large displacement. This variant simplifies the construction of the additional electrical unit assembly, using a single-sided filler strip instead of two semicircular combined filler strips to improve overall cabling roundness.
As shown in fig. 5, a second variant of the multi-core dc submarine cable according to the present invention is different in that the additional electrical unit assembly 13B includes an additional electrical unit 131B and an additional filler strip 132B, and the additional filler strip 132B is located between the additional electrical unit 131B and the polar electrical units 11 and 12, and both sides of the additional filler strip 132B are required to be compressed by the adjacent filler strips 15 to ensure that there is no large displacement. The structure of the additional electric unit assembly is simplified through the variation, and the gravity center of the submarine cable is closer to the geometric center after cabling, so that the operation of later-stage storage and construction process is facilitated.
As shown in fig. 6, a third variant of the multi-core dc submarine cable according to the present invention is distinguished in that the additional electrical unit assembly 13C has a three-core pre-cabling structure, the additional electrical unit assembly 13C includes three cabled additional electrical units 131C, and a filler strip 132C is disposed inside the additional electrical unit assembly 13C, and then the additional electrical unit assembly 13C is secondarily cabled with the two polarity electrical units 11 and 12 again. The sum of the conductor cross sections of the three additional electrical units 131C is the same as the conductor cross sections of the polarity electrical units 11, 12. A number of optical units 133C may also be added within the additional electrical unit assembly 13C, thereby increasing the fiber monitoring and communication channels. According to the variation, the independent additional electric unit is divided into three independent electric units, then the number of the access cores can be flexibly controlled by matching with a power transmission system, the load capacity of the additional electric unit is adjusted according to needs, and the adjustment is more flexible and convenient.
As shown in fig. 7 and 8, the stranding device for a multi-core direct current submarine cable according to the present invention includes a first platform 1, a second platform 2, a counterweight platform 3, a middle shaft 20, two polarity electrical unit turntables 10, an additional electrical unit turntable 30, two auxiliary turntables 31, a first pulling wrapping assembly 32, a first twisting mold 321, a second pulling wrapping assembly 40, a second twisting mold 401, and a steering wheel 50. The polarity electrical units 11, 12 are housed in two polarity electrical unit turntables 10, respectively, the additional electrical unit 131 is housed in the additional electrical unit turntable 30, and the two additional filler strips 132 are housed in two auxiliary turntables 31, respectively. The counterweight platform 3, the first platform 1 and the second platform 2 are sequentially arranged in parallel from bottom to top and share a center shaft, and the center shaft 20 is perpendicular to the middle of the counterweight platform 3. The two polar electric unit rotating discs 10 and the additional electric unit rotating disc 30 are uniformly arranged on the counterweight platform 3 and surround the middle shaft 20. The two auxiliary rotating discs 31 are symmetrically arranged on two sides of the additional electric unit rotating disc 30, the first traction wrapping assembly 32 is arranged on the first platform 1, and the bottom of the first traction wrapping assembly 32 is provided with a first twisting die 321. The second is drawn and is set up on second platform 2 around package subassembly 40, and the second is drawn and is set up second strand die 401 around package subassembly 40 bottom. The diverting pulley 50 is arranged on the second platform 2, and the diverting pulley 50 is butted with the second traction lapping assembly 40.
According to the structural design of the multi-core dc submarine cable of the present invention, the weight per unit length of the additional electrical unit 131 will be less than the weight per unit length of the polar electrical units 11, 12, thereby resulting in an uneven weight distribution over the weight plate 3. Therefore, a plurality of weights 301 are disposed on the weight plate 3 at positions corresponding to the additional electrical unit turntable 30, and the weights 301 are weighted according to the total weight of the additional electrical unit turntable 30, the auxiliary turntable 31 and the load and the weight difference between the polarity electrical unit turntable 10 and the load. The problem that the gravity center is not located at the geometric center in the cabling process is solved, and the balance of vertical rotation of the stranding device is guaranteed. For the same reason, the counterweight 322 is disposed on the side of the first platform 1 where the first pulling wrapping assembly 40 is not disposed, so as to further ensure the balance of the twisting device. It is noted that each time a kilometer of stranding is completed, the weight difference needs to be recalculated and the counterweight changed accordingly.
For the first and second variants of the multi-core dc submarine cable, the additional filling bars 132A or 132B are only required to be installed in the auxiliary turntable 31 on one side.
For a third variant of the multi-core direct-current submarine cable, the stranding device of the multi-core direct-current submarine cable, as shown in fig. 9, includes three additional electric unit turntables 30A, in this scheme, the three additional electric unit turntables 30A need to firstly rotate counterclockwise around a stranding center 302A to complete one-time stranding, and each additional electric unit 131C rotates clockwise in the stranding process to make the axial torsion of the cable disappear; synchronously, the twisted additional electrical unit 131C and the two polar electrical units 11 and 12 rotate counterclockwise around the central axis 20 to complete the secondary twisting, each polar electrical unit rotates clockwise in the twisting process to eliminate the axial torsion of the cable, where ω 1 is ω 2, and the rest of the working processes are the same as the original scheme.
As shown in fig. 10, the present invention further discloses a method for producing a multi-core dc submarine cable, which is used for preparing the multi-core dc submarine cable, and adopts the stranding device of the multi-core dc submarine cable, comprising the steps of:
(A) the polar electrical unit turntable 10 and the additional electrical unit turntable 30 are at an angular velocity ω1Counterclockwise about the central axis 20; meanwhile, the polarity electrical unit turntable 10, the additional electrical unit turntable 30 and the auxiliary turntable 31 are synchronized at an angular velocity ω2Rotating clockwise to eliminate the axial torsion of the cable core; at the same time, the first stage 1 is synchronized with an angular velocity ω3Rotating anticlockwise; wherein, ω is1＝ω2＝ω3；
(B) Synchronously, the first pulling wrapping assembly 32 is driven at a speed v1The additional electrical unit 131 or the additional electrical unit and the additional filler strip are pulled vertically upwards and merged into the additional electrical unit assembly 13 shown in fig. 3 at the first twist mold 321 and bundled firmly; at the same time, the second tractionWrapping assembly 40 is wound at a speed v2The wrapped additional electric unit assembly 13 and the two polarity electric units 11 and 12 are vertically and upwards pulled and are converged at the second twisting die 301 to form an integral circular structure; wherein v is1＝v2；
(C) And synchronously, the whole round structure is filled and rounded by the filling strip 15, and is firmly bound by the wrapping assembly 40 through second traction, so that the tape binding is completed.
(D) After the banding, the steel belt enters the subsequent armor and outer protective layer production process through the steering wheel 50.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (2)
1. A stranding device of a multi-core direct-current submarine cable is characterized by being used for producing the multi-core direct-current submarine cable, wherein the multi-core direct-current submarine cable comprises two same polarity electric units, an additional electric unit assembly, a plurality of filling strips, a belt, a cushion layer, an armor layer and an outer protective layer, and the outer diameter of the section of the additional electric unit assembly is the same as that of the section of the polarity electric unit; the two polar electric units and the additional electric unit assembly are twisted together, and the wrapping belt, the cushion layer, the armor layer and the outer protective layer are sequentially wrapped outside the polar electric units and the additional electric unit assembly; a plurality of filling strips are arranged in gaps among the two polar electric units, the additional electric unit assemblies and the wrapping tape; the stranding device of the multi-core direct-current submarine cable comprises a first platform, a second platform, a balance weight platform, a middle shaft, two polarity electric unit turntables, an additional electric unit turntable, at least one auxiliary turntable, a first traction lapping assembly, a first stranding die, a second traction lapping assembly, a second stranding die and a steering wheel; the two polarity electric units are respectively arranged in the two polarity electric unit turntables; the auxiliary turntable is arranged on the side part of the additional electric unit turntable; the counterweight platform, the first platform and the second platform are sequentially arranged in parallel from bottom to top, the middle shaft is perpendicular to the middle of the counterweight platform, and the two polar electric unit rotating discs and the additional electric unit rotating disc are uniformly arranged on the counterweight platform; the first traction wrapping assembly is arranged on the first platform, and the bottom of the first traction wrapping assembly is provided with the first twisting die; the second traction wrapping assembly is arranged on the second platform, and the bottom of the second traction wrapping assembly is provided with the second twisting die; the steering wheel is arranged on the second platform and is in butt joint with the second traction wrapping assembly; a plurality of counter weights are arranged on the counter weight plate at positions corresponding to the positions of the additional electric unit turnplates vertically; and a counterweight is arranged on one side of the first platform, which is not provided with the first traction wrapping assembly.
2. A method for producing a multi-core dc submarine cable, wherein the stranding apparatus of the multi-core dc submarine cable according to claim 1 is used, comprising the steps of:
(A) the two polar electric unit turntables and the additional electric unit turntable rotate around the central shaft anticlockwise at an angular speed omega 1; the polar electric unit turntable, the additional electric unit turntable and the auxiliary turntable synchronously rotate clockwise at an angular velocity omega 2, the first platform synchronously rotates counterclockwise at an angular velocity omega 3, wherein omega 1= omega 2= omega 3;
(B) synchronously, the first traction wrapping assembly vertically pulls the additional electrical unit or the additional electrical unit and the additional filler strip upwards at a speed v1, the additional electrical unit assembly is converged at the first twisting die and is firmly bundled, the second traction wrapping assembly vertically pulls the additional electrical unit assembly and the two polar electrical units upwards at a speed v2, the additional electrical unit assembly and the two polar electrical units are converged at the second twisting die into an integral circular structure, wherein v1= v 2;
(C) synchronously, the whole round structure is filled and rounded by the filling strips, and is firmly bound by the second traction wrapping assembly, so that the bundling by the wrapping belt is completed;
(D) and after the bundling of the wrapping tape is finished, the subsequent armor and outer protective layer production procedures are carried out through the steering wheel.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010406955.2A CN111554435B (en) | 2020-05-14 | 2020-05-14 | Multi-core direct-current submarine cable and production method thereof |
| PCT/CN2020/098622 WO2021227212A1 (en) | 2020-05-14 | 2020-06-28 | Multi-core direct-current submarine cable and method for producing same |
| EP20935489.3A EP4152346A4 (en) | 2020-05-14 | 2020-06-28 | Multi-core direct-current submarine cable and method for producing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010406955.2A CN111554435B (en) | 2020-05-14 | 2020-05-14 | Multi-core direct-current submarine cable and production method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111554435A CN111554435A (en) | 2020-08-18 |
| CN111554435B true CN111554435B (en) | 2021-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010406955.2A Active CN111554435B (en) | 2020-05-14 | 2020-05-14 | Multi-core direct-current submarine cable and production method thereof |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4152346A4 (en) |
| CN (1) | CN111554435B (en) |
| WO (1) | WO2021227212A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115206593A (en) * | 2022-06-30 | 2022-10-18 | 中天科技海缆股份有限公司 | Submarine cable production system, submarine cable production method and submarine cable |
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| US20160070080A1 (en) * | 2013-06-19 | 2016-03-10 | Abb Technology Ltd | A power cable assembly device and a power cable provided with such a device |
| GB2567406B (en) * | 2017-07-31 | 2021-12-15 | Blue Frontier Engineering Ltd | Cable including monitoring strand |
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- 2020-05-14 CN CN202010406955.2A patent/CN111554435B/en active Active
- 2020-06-28 WO PCT/CN2020/098622 patent/WO2021227212A1/en unknown
- 2020-06-28 EP EP20935489.3A patent/EP4152346A4/en active Pending
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| JPH11120834A (en) * | 1997-10-09 | 1999-04-30 | Fujikura Ltd | Neutral wire composite cable for direct current power |
| CN1643623A (en) * | 2002-04-03 | 2005-07-20 | 斯塔德电信电缆股份公司 | Three-conductor cable |
| CN106796827A (en) * | 2014-09-05 | 2017-05-31 | 普睿司曼股份公司 | Submerged cable and submerged cable operating method |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN111554435A (en) | 2020-08-18 |
| EP4152346A4 (en) | 2024-08-07 |
| WO2021227212A1 (en) | 2021-11-18 |
| EP4152346A1 (en) | 2023-03-22 |
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Effective date of registration: 20200821 Address after: 226010 No. 1 South Road, Nantong economic and Technological Development Zone, Jiangsu, China Applicant after: ZHONGTIAN TECHNOLOGIES SUBMARINE CABLE Co.,Ltd. Address before: 226000 No. 1 South Road, Nantong economic and Technological Development Zone, Jiangsu, China Applicant before: ZHONGTIAN TECHNOLOGIES SUBMARINE CABLE Co.,Ltd. Applicant before: JIANGSU ZHONGTIAN TECHNOLOGY Co.,Ltd. |
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Address after: 226000 No. 1 South Road, Nantong economic and Technological Development Zone, Jiangsu, China Applicant after: Zhongtian Technology submarine cable Co.,Ltd. Address before: 226010 No. 1 South Road, Nantong economic and Technological Development Zone, Jiangsu, China Applicant before: ZHONGTIAN TECHNOLOGIES SUBMARINE CABLE Co.,Ltd. |
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Denomination of invention: A multi-core DC submarine cable and its production method Effective date of registration: 20220613 Granted publication date: 20211228 Pledgee: Rudong sub branch of Bank of China Ltd. Pledgor: Zhongtian Technology submarine cable Co.,Ltd. Registration number: Y2022320000270 |