CN111653401A - Steel wire armored submarine cable design method - Google Patents
Steel wire armored submarine cable design method Download PDFInfo
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- CN111653401A CN111653401A CN202010542338.5A CN202010542338A CN111653401A CN 111653401 A CN111653401 A CN 111653401A CN 202010542338 A CN202010542338 A CN 202010542338A CN 111653401 A CN111653401 A CN 111653401A
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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
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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
- 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
- H01B7/22—Metal wires or tapes, e.g. made of steel
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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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Abstract
The invention discloses a method for designing a steel wire armored submarine cable, which comprises the following steps: step 100: calculating the number n of armored steel wires according to the diameter D of the armored steel wires, the outer diameter D of the cable before armoring, the armored pitch h and a coverage coefficient k, wherein the coverage coefficient k is more than 0.9; step 200: calculating installation tension T according to the maximum laying working water depth S, the maximum tail end tension H of the cable during installation and the weight w of the cable in unit length; step 300: calculating the maximum working tension according to the number n of the armored steel wires and the strength sigma of the armored steel wires
Wherein K is a safety factor, and the value of K is between 4 and 6; step (ii) of400: and judging whether the maximum working tension F is smaller than the installation tension T, if so, replacing the armored steel wire with higher strength, and returning to the step 300. The design method of the steel wire armored submarine cable effectively solves the problem that the steel wire armored submarine cable is difficult to meet the requirements in design.
Description
Technical Field
The invention relates to the field of cable design, in particular to a method for designing a steel wire armored submarine cable.
Background
The deep and far sea marine environment is complex, the working tension of the submarine cable is obviously increased, and the requirement of the submarine cable for designing the working tension cannot be met by adopting 340MPa (megapascal) and 650MPa low-strength steel wire armoring at present. According to the conventional photoelectric composite submarine power cable, the outer diameter of the stranded three cores is larger than that of a submarine cable, if the number of armored steel wires is too large, the submarine cable is heavy, and the requirement of the submarine cable with large working tension in deep and far sea is difficult to meet.
In summary, how to effectively solve the problem that the steel wire armored submarine cable is difficult to meet the requirements is a problem that needs to be solved urgently by those skilled in the art at present.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for designing a steel wire armored submarine cable, which can effectively solve the problem that the design of the steel wire armored submarine cable is difficult to meet the requirements.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for designing a steel wire armored submarine cable comprises the following steps:
step 100: calculating the number n of armored steel wires according to the diameter D of the armored steel wires, the outer diameter D of the cable before armoring, the armored pitch h and a coverage coefficient k, wherein the coverage coefficient k is more than 0.9;
step 200: calculating installation tension T according to the maximum laying working water depth S, the maximum tail end tension H of the cable during installation and the weight w of the cable in unit length;
step 300: calculating the maximum working tension according to the number n of the armored steel wires and the strength sigma of the armored steel wires
Wherein K is a safety factor, and the value of K is between 4 and 6;
step 400: and judging whether the maximum working tension F is smaller than the installation tension T, if so, replacing the armored steel wire with higher strength, and returning to the step 300.
In the method for designing the steel wire armored submarine cable, proper armored steel wires are selected in advance to control the diameter D of the armored steel wires, the armored pitch h and the coverage coefficient k are determined, the outer diameter D of the cable before armored is obtained at the same time, and then the number of the armored steel wires is determined according to the parameters to determine that the size and the weight of the whole submarine cable meet the requirements. And then calculating according to the maximum working tension and the environmental tension requirement to judge whether the current submarine cable meets the requirement, if not, replacing the high-strength armored steel wire, re-checking whether the maximum working tension of the submarine cable can meet the requirement, and further determining the corresponding submarine cable. The structural parameters of the submarine cable are determined in advance, so that the situation that the invariability is increased due to the adjustment of the structural parameters of the armored steel wire layer is avoided, and the situation that the final requirement is difficult to be accurately approached is further avoided. The steel wires of the existing armor steel wire layer are various, and the strength of the steel wires is easy to adjust so as to obtain the submarine cable meeting the requirements. The design is simpler and more convenient, and in conclusion, the design method of the steel wire armored submarine cable effectively solves the problem that the design of the steel wire armored submarine cable is difficult to meet the requirements.
Preferably, the step 100 is:
according to the diameter D of the armored steel wire, the outer diameter D of the cable before armoring, the armored pitch h and the coverage coefficient k, the number of armored steel wires is calculated
Preferably, the step 200 specifically includes: the installation tension T is calculated to be 1.3 × w × S + H from the maximum laying work depth S, the maximum end tension H of the cable at the time of installation, and the cable weight w per unit length.
Preferably, the stranding angle of the armor wires is 45 degrees.
Preferably, the step 400 is followed by:
step 500: and (3) judging whether at least one parameter of the flat force resistance performance, the lateral pressure resistance performance, the impact resistance performance and the stacking resistance performance of the submarine cable meets the set requirement, if not, replacing the armored steel wire with higher strength, and returning to the step 300.
Preferably, the elongation at break of the armor wires is not less than 9%, the hardness is more than 295HV, the diameter d of the armor wires is not less than 5 mm, and the strength of the armor wires is 850MPa, 1050MPa, 1250MPa, 1450MPa or 1650 MPa.
Preferably, the submarine cable includes submarine cable sinle silk, packing, light unit, inner liner, armor steel wire layer and tegument, the inner liner the armor steel wire layer with the tegument sets gradually from inside to outside, the armor steel wire layer by the armor steel wire transposition forms, the cable sinle silk pack and the light unit all sets up the inner liner is inboard.
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 flow chart of a method for designing a steel wire armored submarine cable according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional structure diagram of a method for designing a steel wire armored submarine cable according to an embodiment of the present invention.
The drawings are numbered as follows:
the submarine cable comprises a submarine cable core 1, a filling 2, a light unit 3, an inner liner 4, an armored steel wire layer 5, a tegument layer 6 and a pipeline 7.
Detailed Description
The embodiment of the invention discloses a method for designing a steel wire armored submarine cable, which aims to effectively solve the problem that the steel wire armored submarine cable is difficult to meet the requirements in design. .
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.
Referring to fig. 1-2, fig. 1 is a schematic flow chart illustrating a method for designing a steel wire armored submarine cable according to an embodiment of the present invention; fig. 2 is a schematic cross-sectional structure diagram of a method for designing a steel wire armored submarine cable according to an embodiment of the present invention.
In a specific embodiment, the present embodiment provides a method for designing a steel wire armored submarine cable, so as to design a submarine cable having a structural strength satisfying the requirement by the design method. The steel wire armored submarine cable mainly comprises an armored steel wire layer 5 and a plurality of submarine cable cores 1 located on the inner side of the armored steel wire layer 5, wherein the inner side of the armored steel wire layer 5 is generally provided with optical units 3 arranged in parallel with the submarine cable cores 1, the inner side of the armored steel wire layer 5 is provided with an inner lining layer 4, and the outer side of the armored steel wire layer 5 is provided with a tegument layer 6. Wherein the armor steel wire layer 5 refers to a layer structure armored by armor steel wires
Specifically, the method for designing the steel wire armored submarine cable comprises the following steps.
Step 100: and calculating the number n of the armored steel wires according to the diameter D of the armored steel wires, the outer diameter D of the cable before armoring, the armored pitch h and a covering coefficient k, wherein the covering coefficient k is more than 0.9.
Through armor steel wire layer 5 distribution characteristics promptly, acquire armor steel wire root number of armor steel wire layer 5, wherein the armor steel wire root number is more, and general tensile strength is stronger more. Specifically, the calculation may be performed according to the structural characteristics of the armor steel wire layer 5, for example, the number of the armor steel wires of the armor steel wire layer 5 may be calculated according to the occupied volume of the armor steel wire layer 5. Specifically, according to the diameter D of the armored steel wire, the outer diameter D of the cable before armored, the armored pitch h and the coverage coefficient k, the number of the armored steel wires can be calculated according to the following formula
Wherein k is between 0.9 and 1.
It should be noted that the diameter D of the steel wire of the armored steel wire layer, the armored pitch h and the covering coefficient k are generally obtained according to the existing industrial armored standard requirements, and the outer diameter D of the cable before being armored is correspondingly designed according to the cable core inside the submarine cable.
Step 200: and calculating the installation tension T according to the maximum laying working water depth S, the maximum tail end tension H of the cable during installation and the weight w of the cable in unit length.
I.e. to obtain at least how much tension the submarine cable needs to withstand in the target installation environment. Specifically, if the submarine cable is installed in an environment with a wave height of less than 2 meters and a water depth of less than 500 meters, the maximum tension T of the standing bending test of the submarine cable can be calculated according to the following formula: t is 1.3 × w × S + H, where w is the weight in 1 meter submarine cable water, generally in units of N/m (newton per meter), S is the maximum laying working depth S, which is generally not less than 50m (meters), H is the maximum tip tension at installation, and the maximum tip tension hbmin is not less than 40w (watts).
Step 300: calculating the maximum value according to the number n of the armored steel wires and the strength sigma of the armored steel wiresHigh working tension
Wherein K is a safety factor, and the value of K is between 4 and 6;
after the safety factor is considered, the maximum working tension of the armor steel wire layer 5 is calculated, so that whether the maximum working tension meets the requirement or not can be judged conveniently in the following process. σ is the strength of the armor steel wire, and the unit is generally MPa (megapascal), and is generally obtained according to the kind of the armor steel wire layer 5.
Step 400: and judging whether the maximum working tension F is smaller than the installation tension T, if so, replacing the armored steel wire with higher strength, and returning to the step 300.
And then comparing and judging the calculated maximum working tension F, if the maximum working tension is not less than the installation tension T, indicating that the strength of the submarine cable meets the requirements of the current installation environment, and further obtaining various parameters of the armored steel wire layer, otherwise, not meeting the requirements of the installation environment. At this time, it is very difficult to adjust the structural parameters of the armor steel wire layer, which increases the invariability, and thus it is difficult to accurately approach the final requirement. The types of the armor wires of the armor steel wire layer 5 are many. Specifically, how to select the armored steel wire with higher strength can select the steel wire with higher strength from the existing strength steel wires to perform corresponding calculation. Alternatively, the magnitude of the single strength increase is set to be calculated, and then a steel wire with an appropriate strength is selected.
Further, to ensure adequate cable deflection, it is preferred that the armor wires be twisted at 45 degrees because in untwisted, one wire armor pitch line is deformed to π Dsin α at the twist angle, where D armor the outer diameter of the cable before armor
Wherein L is the core length on the cabling pitch, if L is used
Instead, then armorDeformation per unit length of wire
Where h is the sheathing pitch and if the sheathing pitch h is replaced by mD, where m is the pitch to diameter ratio, then
And the pitch diameter ratio m is replaced by pi tan α
From this formula it can be seen that the deformation y per unit length of armouring wire gets the maximum value when the twist angle is 45 degrees.
Further, in order to ensure that the submarine cable has sufficient strength requirements, it is preferable here that step 400 is followed by step 500: and (3) judging whether at least one parameter of the flat force resistance performance, the lateral pressure resistance performance, the impact resistance performance and the stacking resistance performance of the submarine cable meets the set requirement, if not, replacing the armored steel wire with higher strength, and returning to the step 300. For the compression and compression force resistance performance, the submarine cable bearing the extrusion load comprises a linear tensioning system in the installation process, the traction tension is obtained by extruding two or more side surfaces of the cable, the time for bearing the extrusion load is recommended to be at least 1 hour, and the compression and compression force of the high-strength steel wire armored cable is increased by 150 percent compared with the compression and compression force resistance of the ordinary-strength submarine cable. For the lateral pressure resistance performance among them: the axial tension and the bending radius of the submarine cable determine the lateral pressure value of the submarine cable. The lateral pressure is mainly generated at the bent inner side part of the submarine cable, and the high-strength steel wire armor compressive flatness is increased by 150% compared with the compressive lateral pressure of the ordinary-strength submarine cable. The side pressure is calculated as follows:
the pressure measurement is in units of N/m (newton per meter), where T is the installation tension of the submarine cable, typically in units of N (newton), and R is the bending radius, typically in units of m (meters). Wherein the impact resistance: high-strength steel wire capable of bearing impact load of submarine cableThe armored impact resistance power is increased by 150% compared with the pressure resistance of the submarine cable with common strength. The stacking performance refers to the capability of the submarine cable laid in a hard seabed environment to bear long-term extrusion load during storage and transportation, the stacking-resistant submarine cable has the capability of resisting the long-term extrusion load, the testing time is generally at least 7 days, and the high-strength steel wire armoured impact-resistant power is increased by 150% compared with the common-strength submarine cable.
Specifically, when the steel wire for armor is selected, in order to secure the strength of the steel wire for armor, it is preferable that the steel wire for armor has an elongation at break of not less than 9%, a hardness of more than 295HV (vickers hardness), a diameter d of not less than 5 mm, and the steel wire for armor has a strength of 850MPa, 1050MPa, 1250MPa, 1450MPa, or 1650 MPa.
Furthermore, the submarine cable can also comprise a submarine cable core 1, a filler 2, a light unit 3, a lining 4, an armor steel wire layer 5 and an outer tegument 6, wherein the lining 4, the armor steel wire layer 5 and the outer tegument 6 are sequentially arranged from inside to outside, the armor steel wire layer 5 is formed by twisting armor steel wires, and the submarine cable core 1, the filler 2 and the light unit 3 are all arranged on the inner side of the lining 4. Wherein the inner liner layer 4 and the outer layer 6 may be a wrapping or extrusion layer, or one may be a wrapping and the other an extrusion layer. Further, when three tightly attached submarine cable cores 1 are arranged inside the submarine cable core, a pipeline 7, such as a metal pipeline and/or a non-metal pipeline, can be placed in the gap of the three submarine cable cores, wherein a control core can be placed in the non-metal pipeline, and wherein the metal pipeline can be used for conveying liquid or gas. In addition, it should be noted that, the armor steel wire layer may be a layer of steel wire, or may be a plurality of layers of steel wires, and if a plurality of layers of steel wires are used, an isolation layer may be disposed between the steel wires of each layer.
The submarine cable core 1 is a main functional component of a submarine cable, and a conductor, an inner semi-conductive shielding layer, an extruded insulating layer, an outer semi-conductive shielding layer, a semi-conductive water-blocking layer, a metal shielding layer and a plastic protective layer are sequentially arranged from inside to outside. The conductor is made of copper, aluminum, copper alloy tubes or aluminum alloy materials, the conductor shield, the insulation and the insulation shield are formed by three layers of crosslinkable polyethylene materials through co-extrusion, the production is formed by heating and crosslinking inert gases, the outer semi-conductive water-resistant material is formed by wrapping an expansion water-blocking strip, and the metal shield is wrapped by copper strips, copper wires, lead and other metal materials. The filling 2 between several submarine cable cores 1 may be polypropylene, polyethylene, polyvinyl chloride or other thermoplastic material. The filling 2 can be a flexible rope or a shaped filling. The optical unit 3 is mainly used for communication signal transmission and can also be used for measuring stress, vibration, temperature and the like. Single mode or multimode fibers may be used, as well as both single mode and multimode fibers. Wherein the inner liner 4 is preferably a polypropylene rope wrap, which may also be extruded from polyethylene, polyvinyl chloride or other thermoplastic materials.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
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 (7)
1. A method for designing a steel wire armored submarine cable is characterized by comprising the following steps:
step 100: calculating the number n of armored steel wires according to the diameter D of the armored steel wires, the outer diameter D of the cable before armoring, the armored pitch h and a coverage coefficient k, wherein the coverage coefficient k is more than 0.9;
step 200: calculating installation tension T according to the maximum laying working water depth S, the maximum tail end tension H of the cable during installation and the weight w of the cable in unit length;
step 300: calculating the maximum working tension according to the number n of the armored steel wires and the strength sigma of the armored steel wires
Wherein K is a safety factor, and the value of K is between 4 and 6;
step 400: and judging whether the maximum working tension F is smaller than the installation tension T, if so, replacing the armored steel wire with higher strength, and returning to the step 300.
2. The method of designing a wire-armored submarine cable according to claim 1, wherein said step 100 is:
according to the diameter D of the armored steel wire, the outer diameter D of the cable before armoring, the armored pitch h and the coverage coefficient k, the number of armored steel wires is calculated
3. The method for designing a wire-armored submarine cable according to claim 1, wherein the step 200 is specifically: and calculating the installation tension T to be 1.3 multiplied by w multiplied by S + H according to the maximum laying working water depth S, the maximum tail end tension H of the cable during installation and the weight w of the cable per unit length.
4. The method of claim 1, wherein the armoured steel wires have a lay angle of 45 degrees.
5. The method of designing a wire-armored submarine cable according to claim 1, wherein said step 400 is followed by further comprising:
step 500: and (3) judging whether at least one parameter of the flat force resistance performance, the lateral pressure resistance performance, the impact resistance performance and the stacking resistance performance of the submarine cable meets the set requirement, if not, replacing the armored steel wire with higher strength, and returning to the step 300.
6. The method of designing a wire-armored submarine cable according to any one of claims 1 to 5, wherein the armor wires have an elongation at break of not less than 9%, a hardness of more than 295HV, a diameter d of not less than 5 mm, and a strength of 850MPa, 1050MPa, 1250MPa, 1450MPa or 1650 MPa.
7. The method for designing a steel wire armored submarine cable according to claim 6, wherein the submarine cable comprises a submarine cable core, a filler, a light unit, an inner liner, an armored steel wire layer and an outer lining layer, the inner liner, the armored steel wire layer and the outer lining layer are sequentially arranged from inside to outside, the armored steel wire layer is formed by twisting the armored steel wires, and the cable core, the filler and the light unit are all arranged on the inner side of the inner liner.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114914039A (en) * | 2022-06-29 | 2022-08-16 | 中天科技海缆股份有限公司 | Manufacturing method of submarine cable, submarine cable and armored forming branching device |
| WO2023065793A1 (en) * | 2021-10-19 | 2023-04-27 | 大连理工大学 | Multifunctional integrated software development platform and method for marine cable, and storage medium |
| US12124776B2 (en) | 2021-10-19 | 2024-10-22 | Dalian University Of Technology | Marine cable multifunctional integrated software development platform, method, and storage medium |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023065793A1 (en) * | 2021-10-19 | 2023-04-27 | 大连理工大学 | Multifunctional integrated software development platform and method for marine cable, and storage medium |
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