WO2019061176A1 - 单芯海缆 - Google Patents

单芯海缆 Download PDF

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Publication number
WO2019061176A1
WO2019061176A1 PCT/CN2017/104048 CN2017104048W WO2019061176A1 WO 2019061176 A1 WO2019061176 A1 WO 2019061176A1 CN 2017104048 W CN2017104048 W CN 2017104048W WO 2019061176 A1 WO2019061176 A1 WO 2019061176A1
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WIPO (PCT)
Prior art keywords
core
layer
submarine cable
segment
cable according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2017/104048
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English (en)
French (fr)
Inventor
王丽媛
张建民
赵囿林
叶成
王文超
薛建林
谢书鸿
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Zhongtian Technology Co Ltd
Zhongtian Technology Submarine Cable Co Ltd
Original Assignee
Jiangsu Zhongtian Technology Co Ltd
Zhongtian Technology Submarine Cable Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Zhongtian Technology Co Ltd, Zhongtian Technology Submarine Cable Co Ltd filed Critical Jiangsu Zhongtian Technology Co Ltd
Priority to ES17927143T priority Critical patent/ES3018289T3/es
Priority to PL17927143.2T priority patent/PL3564970T3/pl
Priority to EP17927143.2A priority patent/EP3564970B1/en
Publication of WO2019061176A1 publication Critical patent/WO2019061176A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4415—Cables for special applications
    • G02B6/4416—Heterogeneous cables
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4415—Cables for special applications
    • G02B6/4427—Pressure resistant cables, e.g. undersea cables
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/443—Protective covering
    • G02B6/4432—Protective covering with fibre reinforcements
    • 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
    • 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
    • H01B7/221—Longitudinally placed metal wires or tapes
    • H01B7/225—Longitudinally placed metal wires or tapes forming part of an outer sheath
    • 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
    • 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
    • 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
    • H01B9/027—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of semi-conducting layers

Definitions

  • the invention relates to the technical field of alternating current power cables used underwater, and in particular to a single core submarine cable.
  • Single-core submarine cables use a single conductor to transmit and distribute electrical energy, facilitating line connections and wiring to equipment, and can meet demanding sea construction conditions, especially for power transmission in coastal cities and offshore wind power.
  • the submarine cable preset route multi-segment design is more complicated.
  • the laying environment and working conditions will affect the current carrying capacity of the submarine cable, and there is a routing bottleneck segment where the current carrying capacity does not meet the rated current requirement.
  • the same submarine cable cannot guarantee the rated current requirement under each routing condition.
  • the technical solution provided by the present invention is: a single-core sea cable comprising a core body, an inner sheath layer disposed outside the core body, an armor layer disposed outside the inner sheath layer, the armor layer including the root layer
  • the first metal wire and the second metal wire are connected in a constant number, and the number of the first metal wire and the second metal wire is different in values of at least one of the first segment and the second segment.
  • each of the first metal wires is a copper wire or an aluminum wire.
  • the second metal wire is a steel wire.
  • first metal wire and the second metal wire are round wires or flat wires.
  • first metal wire, the second metal wire, or a combination of the two is continuously arranged outside the circumference of the inner sheath.
  • the core body includes a water blocking conductor and a water blocking filler material disposed in the gap of the water blocking conductor.
  • the inner sheath layer is disposed outside the core body, and includes a conductor shielding layer, an insulating layer, an insulating shielding layer and a first sheath layer which are sequentially disposed from the inside and the outside, and the first sheath layer is included
  • the water blocking tape is arranged in the outer layer, the metal sheath, the polyethylene sheath and the inner liner.
  • a filling protection layer and a fiber unit in the gap of the filling protection layer are provided, and the fiber unit comprises an optical fiber, a water blocking grease, a stainless steel tube and a plastic. Protective layer.
  • an outer sheath layer is disposed outside the armor layer.
  • each of the single-core submarine cables simultaneously meets the requirements for rated current under multi-segment routing conditions.
  • the carrier current is low enough to meet the rated current requirement; under the premise of meeting the rated current requirement, by increasing the number of the second metal wires, the mechanical strength can be improved and the cost can be reduced.
  • the current carrying capacity provided by the invention can control and adjust the single-core submarine cable, and the current carrying capacity can meet the requirements of the rated bottleneck of the routing bottleneck section; the same single-core submarine cable can be disposed in different regions and environments at the same time. Under the multi-segment routing conditions, the rated current requirements, and the optimization of mechanical strength and cost, practicality and operability, easy to construct, the amount of materials used is reasonable.
  • FIG. 1 is a schematic structural view of a first segment of a single-core submarine cable according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural view of a second segment of the single-core submarine cable shown in FIG. 1.
  • FIG. 3 is a schematic structural view of the first sheath shown in FIG. 2.
  • FIG. 4 is a schematic structural view of the optical fiber unit shown in FIG.
  • the single-core cable 100 is used as a power cable for underwater power transmission, for example, in the coastal city power supply and offshore wind power generation, and includes a core body disposed at the center.
  • An inner sheath 20 outside the core 10 an armor layer 30 disposed outside the inner sheath 20, the armor layer 30 including the first metal wire 31 and the second having a constant sum of root numbers
  • the metal wire 32 has a different number of the first metal wire 31 and the second metal wire 32 than the values of the at least one first segment and the second segment.
  • the core 10 is disposed at the center of the single-core cable 100, and includes a water blocking conductor and a water blocking filler material disposed in the gap of the water blocking conductor, the water blocking conductor It is a carrier for the current transmission of the single-core cable 100, and the water-blocking filler is a gap filler, which has a water-blocking protection effect on the water-blocking conductor.
  • the water blocking conductor is in the form of a circular tight-twisted strand or a profile
  • the water-blocking filler is one or a combination of a water blocking strip, a water blocking powder, a water blocking yarn or a water blocking glue.
  • the inner sheath 20 is disposed outside the core 10 to shield, insulate and protect the core 10 , and includes a conductor shielding layer 21 disposed in sequence from the inside to the outside.
  • the conductor shielding layer 21 is composed of a semi-conductive baffle water-wrap wrapping and an ultra-smooth semi-conductive shielding material, and the insulating layer 22 is uniformly extruded on the conductor shielding layer 21 by using an ultra-clean cross-linked polyethylene material.
  • the insulating shielding layer 23 is directly extruded on the insulating layer 22 by using an ultra-smooth semi-conductive shielding material.
  • the first sheath 50 includes a water blocking tape wrap 51, a metal sheath 52, a polyethylene sheath 53, and an inner liner 54 which are sequentially disposed from the inside to the outside.
  • the water blocking tape wrapping layer 51 is wrapped on the insulating shielding layer 23 by using a semiconductive electric water strip material.
  • the metal sheath 52 is a continuous sealing structure, and the alloy lead is directly extruded on the resist.
  • the polyethylene sheath 53 is directly extruded on the metal sheath 52 by using a semi-conductive polyethylene or an insulating polyethylene thermoplastic sheathing material, and the inner liner 54 has a diameter of 2 ⁇ 4mm high strength polypropylene PP fiber rope wrapping structure.
  • the single-core cable 100 can be an opto-electric composite cable.
  • the first sheath 50 is provided between the polyethylene sheath 53 and the inner liner 54 with a filling protective layer 55 and a fiber unit 56 in the gap of the filling protective layer.
  • the filling protective layer 55 is A cylinder that is continuously extruded using a high strength thermoplastic material is used to fill and protect the fiber unit 56.
  • the optical fiber unit 56 is used as a carrier for optical signal transmission in the single-core cable 100, and is composed of an optical fiber 56-a, a water-blocking grease 56-b, a stainless steel tube 56-c, and a plastic sheath 56-d. There are 2 sets, and each set of the optical fiber unit contains 36 cores.
  • the fiber unit 56 is provided in one, three or four groups, and each of the fiber units 56 has from 1 to 36 cores.
  • the single core submarine cable 100 may not include the fiber optic unit 56 and its fill protection layer 55.
  • the armor layer 30 is used to increase the mechanical strength and erosion resistance of the single-core cable 100, and the armor layer 30 includes a first metal wire 31 having a constant sum of root numbers and
  • the second metal wire 32 is a round copper wire, and the second metal wire 32 is a round wire.
  • the introduction of the first metal wire 31 can reduce the armor resistance and armor loss, and the improved current carrying capacity of the single-core cable 100 can meet the rated current requirement under specific routing conditions.
  • the rated current required for the single-core submarine cable 100 is 700A
  • the current carrying capacity of the steel wire armored submarine cable is 650A under a certain routing condition
  • the current carrying capacity of the copper wire armored submarine cable is 850A.
  • Two metal wires are designed.
  • the combination of the armoring improvement, the diameter and the number of the wires are calculated, the ratio of the number of the first metal wires 31 to the second metal wires 32 is 2:5, and the single-core cable 100 is obtained.
  • the download traffic is 710A, which satisfies its requirements for rated current.
  • the number of the first metal wire 31 and the second metal wire 32 is different between the values of the at least one first segment and the second segment, and the same number can be obtained by adjusting the root ratio of the metal wires by segmentation.
  • the single-core submarine cable 100 simultaneously meets the requirements of rated current under multi-segment routing conditions, and achieves optimization of mechanical strength and cost. Due to the different geographical and routing conditions of the laying, the same requirement for the same submarine cable to be routed by the bottleneck segment is that the routing traffic in other segments exceeds the preset index, the mechanical performance is generally high, and the cost is high; the traffic is designed to meet the requirements of other segments. Unable to meet the high requirements under the bottleneck segment routing.
  • the first segment is set to be laid under other segment routing conditions, and the second segment is laid under the bottleneck segment routing condition.
  • the single-core submarine cable 100 requires a rated current of 700 A
  • the first segment of the single-core submarine cable 100 has a current carrying capacity of 720 A
  • the first segment of the single-core submarine cable 100 is in the second segment.
  • Laying routing conditions to download The flow rate is 630A
  • the current carrying capacity is less than the rated current requirement, which is a routing bottleneck segment.
  • the single metal wire 31 and the single root are separated by a single root number.
  • the metal wires 32 are spliced to increase the number of the first metal wires 31 on the second segment to increase the current carrying capacity of the second segment to meet the rated current requirement, so that the same single-core cable 100 can be simultaneously satisfied.
  • the first metal wire 31 and the second metal wire 32 are successively arranged in a single layer on the first segment and the second segment shown in FIGS. 1 and 2 outside the circumference of the inner sheath 20.
  • the number of the first metal wires 31 and the second metal wires 32 on the first segment and the second segment is different, and the number of the first metal wires 31 on the first segment is 2/3 on the second segment, the number of the second metal wires 32 on the first segment is 5/4 on the second segment, the first metal wire 31 and the The sum of the number of the second metal wires 32 is constant, the first segment current carrying capacity is 720A, and the second segment current carrying capacity is 710A, both satisfying the preset 700A rated current requirement.
  • the armor layer 30 is provided with an outer sheath 40, which has mechanical protection and anti-corrosion effect on the armor layer 30, and is directly wrapped by an asphalt coating and a polypropylene PP fiber rope having a diameter of 2 to 4 mm.
  • the first metal wire 31 and the second metal wire 32 may be flat wires, and the first metal wire 31 may be aluminum wire or a combination of copper wire and aluminum wire.
  • the number of the first metal wire 31 and the second metal wire 32 may have two or more different values on different segments of the single-core cable 100, and may be reduced under the premise of meeting the rated current requirement.
  • the number of the first metal wires 31 increases the number of the second metal wires 32 to optimize the mechanical strength and cost of the single-core cable 100.
  • the first metal line 31 and the second metal line 32 may be continuously arranged in an irregular single layer.
  • the outer sheath 40 may be one or a combination of materials such as polyethylene, polypropylene, polyvinyl chloride, polyolefin, and the like.
  • Each of the single-core submarine cables provided by the present invention can simultaneously meet the requirements of rated current under multi-segment routing conditions, and achieve optimization of mechanical strength and cost.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Insulated Conductors (AREA)

Abstract

一种单芯海缆（100），包括芯体（10），设于所述芯体（10）外的内护层（20），设于所述内护层（20）外的铠装层（30），所述铠装层（30）包括根数总和恒定的第一金属线（31）和第二金属线（32），且第一金属线（31）与第二金属线（32）的根数在至少一第一分段和一第二分段的数值不同。该载流量可控制可调节的所述单芯海缆（100），其载流量可满足路由瓶颈段对其额定电流的要求；同一根所述单芯海缆可同时满足布设在不同区域和环境的多段路由条件下对其额定电流的要求，并实现机械强度和成本的优化，实用性和操作性强，便于施工，用料量合理。

Description

单芯海缆 技术领域
本发明涉及水下使用的交流电力电缆技术领域，尤其涉及单芯海缆。
背景技术
单芯海缆采用单个导体传输和分配电能，便于线路接头及与设备接线，能够满足苛刻的海域施工条件，特别是应用于沿海城市供电和海上风力发电上的电力输送。基于自然环境的多样性，海缆预设路由多分段设计且较为复杂，同时敷设环境和工况条件均会影响海缆的载流量，存在载流量达不到额定电流要求的路由瓶颈段，导致同一根海缆无法保证在每一段路由条件下均满足额定电流的要求。
降低铠装损耗是提高海缆载流量的有效途径之一。常见铠装有镀锌钢丝铠装和铜丝铠装，其中镀锌钢丝铠装具有较大的电阻值，铠装损耗大，载流量低。铜丝铠装具有低电阻和高耐腐蚀性，但其机械强度低于镀锌钢丝铠装，价格昂贵。
发明内容
鉴于以上内容，有必要提供一种改进的单芯海缆，其具有载流量可调、铠装损耗小、机械强度高、耐腐蚀的特点。
本发明提供的技术方案为：一种单芯海缆，包括芯体，设于所述芯体外的内护层，设于所述内护层外的铠装层，所述铠装层包括根数总和恒定的第一金属线和第二金属线，且第一金属线与第二金属线的根数在至少一第一分段和一第二分段的数值不同。
进一步地，每根所述第一金属线为铜丝或铝丝。
进一步地，所述第二金属线为钢丝。
进一步地，所述第一金属线和所述第二金属线为圆丝或扁丝。
进一步地，所述第一金属线、所述第二金属线、或者两者组合单层连续排设于所述内护层圆周外。
进一步地，所述芯体包括阻水导体及设于所述阻水导体间隙中的阻水填充材料。
进一步地，所述内护层设于所述芯体外，包括由内而外依次设有的导体屏蔽层、绝缘层、绝缘屏蔽层及第一护层，所述第一护层包括由内而外依次设有的阻水带绕包层、金属护层、聚乙烯护层、内衬层。
进一步地，所述聚乙烯护层和所述内衬层之间设有填充保护层及在所述填充保护层间隙的光纤单元，所述光纤单元包括光纤、阻水油膏、不锈钢管及塑料护层。
进一步地，所述铠装层外设有外护层。
进一步地，每根所述单芯海缆同时满足多段路由条件下对额定电流的要求。
与现有技术相比，在根数总和恒定的前提下，通过增加所述第一金属线的根数，减小铠装电阻，降低铠装损耗，提高载流量，解决海缆在路由瓶颈段载流量低不足以满足额定电流要求的问题；在满足额定电流要求的前提下，通过增加所述第二金属线的根数，可提高机械强度，降低成本。本发明提供的载流量可控制可调节的所述单芯海缆，其载流量可满足路由瓶颈段对其额定电流的要求；同一根所述单芯海缆可同时满足布设在不同区域和环境的多段路由条件下对其额定电流的要求，并实现机械强度和成本的优化，实用性和操作性强，便于施工，用料量合理。
附图说明
下面结合附图和具体实施方式对本发明作进一步详细的说明。
图1是本发明一实施例提供的单芯海缆第一分段的结构示意图。
图2是图1所示单芯海缆第二分段的结构示意图。
图3是图2所示第一护层的一种结构示意图。
图4是图3所示光纤单元的结构示意图。
附图标记说明:
单芯海缆 100
芯体 10
内护层 20
铠装层 30
第一金属线 31
第二金属线 32
外护层 40
导体屏蔽层 21
绝缘层 22
绝缘屏蔽层 23
第一护层 50
阻水带绕包层 51
金属护层 52
聚乙烯护层 53
内衬层 54
填充保护层 55
光纤单元 56
光纤 56-a
阻水油膏 56-b
不锈钢管 56-c
塑料护层 56-d
如下具体实施方式将结合上述附图进一步说明本发明实施例。
具体实施方式
为了能够更清楚地理解本发明实施例的上述目的、特征和优点，下面结合附图和具体实施方式对本发明进行详细描述。需要说明的是，在不冲突的情况下，本申请的实施方式中的特征可以相互组合。
在下面的描述中阐述了很多具体细节以便于充分理解本发明实施例，所描述的实施方式仅是本发明一部分实施方式，而不是全部的实施方式。基于本发明中的实施方式，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施方式，都属于本发明实施例保护的范围。
除非另有定义，本文所使用的所有的技术和科学术语与属于本发明实施例的技术领域的技术人员通常理解的含义相同。本文中在本发明的说明书中所使用的术语只是为了描述具体的实施方式的目的，不是旨在于限制本发明实施例。
请参阅图1，本发明一实施例中，所述单芯海缆100为用作水下电力输送的电力电缆，例如用于沿海城市供电和海上风力发电领域，其包括芯体，设于所述芯体10外的内护层20，设于所述内护层20外的铠装层30，所述铠装层30包括根数总和恒定的所述第一金属线31和所述第二金属线32，且所述第一金属线31与所述第二金属线32的根数在至少一第一分段和一第二分段的数值不同。
请参阅图1和图2，所述芯体10设于所述单芯海缆100的中心，包括阻水导体及设于所述阻水导体间隙中的阻水填充材料，所述阻水导体是所述单芯海缆100电流传输的载体，所述阻水填充材料为间隙填充物，对所述阻水导体起阻水保护作用。所述阻水导体采用圆形紧压绞合形式或型线形式，所述阻水填充材料为阻水带、阻水粉、阻水纱或阻水胶中的一种或者几种组合。
请参阅图2和图3，所述内护层20设于所述芯体10外，对所述芯体10起屏蔽、绝缘及保护作用，包括由内而外依次设有的导体屏蔽层21、绝缘层22、绝缘屏蔽层23及第一护层50。所述导体屏蔽层21采用半导电捆扎阻水带绕包和超光滑半导电屏蔽料挤包组成，所述绝缘层22采用超洁净交联聚乙烯材料均匀的挤包在所述导体屏蔽层21上，所述绝缘屏蔽层23采用超光滑半导电屏蔽料直接挤包在所述绝缘层22上。所述第一护层50包括由内而外依次设有的阻水带绕包层51、金属护层52、聚乙烯护层53、内衬层54。所述的阻水带绕包层51采用半导电阻水带材料重叠绕包在所述绝缘屏蔽层23上，所述金属护层52为连续密封结构，采用合金铅直接挤包在所述阻水带绕包层51上，所述聚乙烯护层53采用半导电聚乙烯或绝缘聚乙烯热塑性护套料，直接挤包在所述金属护层52上，所述内衬层54采用直径2～4mm的高强度聚丙烯PP纤维绳绕包结构。
再请参阅图3和图4，所述单芯海缆100可以是一种光电复合缆， 所述第一护层50在所述聚乙烯护层53和所述内衬层54之间设有填充保护层55及在所述填充保护层间隙的光纤单元56，所述填充保护层55为采用高强度热塑性材料连续挤出加工的圆柱体，用于填充保护所述光纤单元56。所述光纤单元56用作所述单芯海缆100中光信号传输的载体，由光纤56-a、阻水油膏56-b、不锈钢管56-c、塑料护层56-d组成，其设有2组，每组所述光纤单元含有36芯。
在其他实施例中，所述光纤单元56设有1组、3组或4组，每组所述光纤单元56含有1～36芯。所述单芯海缆100可不含有所述光纤单元56及其所述填充保护层55。
请参阅图1和图2，所述铠装层30用于增加所述单芯海缆100的机械强度和防侵蚀能力，所述铠装层30包括根数总和恒定的第一金属线31和第二金属线32，所述第一金属线31为圆铜丝，所述第二金属线32为圆钢丝。所述第一金属线31的引入可减小铠装电阻和铠装损耗，改进的所述单芯海缆100的载流量可满足特定路由条件下对额定电流的要求。例如所述单芯海缆100所需的额定电流为700A，某段路由条件下钢丝铠装海缆的载流量为650A，铜丝铠装海缆的载流量为850A，设计采用两种金属线的组合进行铠装改进，计算金属线直径和根数，所述第一金属线31与所述第二金属线32的根数配比为2:5，制得的所述单芯海缆100在该段路由条件下载流量为710A，满足其对额定电流的要求。
所述第一金属线31与所述第二金属线32的根数在至少一第一分段和一第二分段的数值不同，通过分段调整金属线的根数配比可使同一根所述单芯海缆100同时满足多段路由条件下额定电流的要求，且实现机械强度和成本的优化。由于敷设的地域和路由条件不同，同一根海缆以瓶颈段路由的高要求设计则在其它段路由下载流量超出预设指标，机械性能一般，成本高；以其它段路由的要求设计则载流量无法满足瓶颈段路由下的高要求。例如设定第一分段敷设于其它段路由条件下，第二分段敷设于瓶颈段路由条件下。所述单芯海缆100所需的额定电流为700A，所述单芯海缆100的第一分段的载流量为720A，第一分段的所述单芯海缆100在第二分段敷设路由条件下载 流量为630A，其载流量达不到额定电流要求，为路由瓶颈段，本实施例在总根数不变的前提下，通过将单根所述第一金属线31与单根所述第二金属线32拼接以增加第二分段上所述第一金属线31的根数来提高第二分段载流量，使其满足额定电流的要求，实现同一根所述单芯海缆100同时满足第一分段和第二分段上对所述单芯海缆的额定电流的要求。图1和图2所示第一分段和第二分段上所述第一金属线31与所述第二金属线32单层连续排设于所述内护层20圆周外。第一分段与第二分段上所述第一金属线31和所述第二金属线32的根数为不同数值，所述第一金属线31在第一分段上的根数是其在第二分段上的2/3，所述第二金属线32在第一分段上的根数是其在第二分段上的5/4，所述第一金属线31和所述第二金属线32的根数总和恒定，第一分段载流量为720A，第二分段载流量为710A，均满足预设700A的额定电流要求。所述铠装层30外设有外护层40，对所述铠装层30起机械保护和抗腐蚀作用，采用沥青涂覆和直径2～4mm的聚丙烯PP纤维绳直接绕包。
在其他实施例中，所述第一金属线31和所述第二金属线32可以采用扁丝，所述第一金属线31可以为铝丝或者铜丝与铝丝的组合。所述第一金属线31和所述第二金属线32的根数在所述单芯海缆100的不同分段上可以有两组以上不同数值，在满足额定电流要求的前提下，可减少所述第一金属线31的根数，增加所述第二金属线32的根数，实现所述单芯海缆100的机械强度和成本的最优化。所述第一金属线31和所述第二金属线32可以不规则单层连续排设。所述外护层40可以采用聚乙烯、聚丙烯、聚氯乙烯、聚烯烃等材料中的一种或组合。
本发明提供的每根所述单芯海缆能够同时满足多段路由条件下额定电流的要求，且实现机械强度和成本的优化。
以上实施方式仅用以说明本发明实施例的技术方案而非限制，尽管参照以上较佳实施方式对本发明实施例进行了详细说明，本领域的普通技术人员应当理解，可以对本发明实施例的技术方案进行修改或等同替换都不应脱离本发明实施例的技术方案的精神和范围。

Claims (10)

  1. 一种单芯海缆，包括芯体，设于所述芯体外的内护层，设于所述内护层外的铠装层，其特征在于：所述铠装层包括根数总和恒定的第一金属线和第二金属线，且所述第一金属线与所述第二金属线的根数在至少一第一分段和一第二分段的数值不同。
  2. 根据权利要求1所述的单芯海缆，其特征在于：每根所述第一金属线为铜丝或铝丝。
  3. 根据权利要求1所述的单芯海缆，其特征在于：所述第二金属线为钢丝。
  4. 根据权利要求1所述的单芯海缆，其特征在于：所述第一金属线和所述第二金属线为圆丝或扁丝。
  5. 根据权利要求1所述的单芯海缆，其特征在于：所述第一金属线、所述第二金属线、或者两者组合单层连续排设于所述内护层圆周外。
  6. 根据权利要求1所述的单芯海缆，其特征在于：所述芯体包括阻水导体及设于所述阻水导体间隙中的阻水填充材料。
  7. 根据权利要求1所述的单芯海缆，其特征在于：所述内护层设于所述芯体外，包括由内而外依次设有的导体屏蔽层、绝缘层、绝缘屏蔽层及第一护层，所述第一护层包括由内而外依次设有的阻水带绕包层、金属护层、聚乙烯护层、内衬层。
  8. 根据权利要求7所述的单芯海缆，其特征在于：所述聚乙烯护层和所述内衬层之间设有填充保护层及在所述填充保护层间隙的光纤单元，所述光纤单元包括光纤、阻水油膏、不锈钢管及塑料护层。
  9. 根据权利要求1所述的单芯海缆，其特征在于：所述铠装层外设有外护层。
  10. 根据权利要求1所述的单芯海缆，其特征在于：每根所述单芯海缆同时满足多段路由条件下对额定电流的要求。
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