Single-core photoelectric composite cable and repairing method thereof

Abstract

The invention discloses a single-core photoelectric composite cable and a repairing method thereof, and belongs to the technical field of cable manufacturing, the single-core photoelectric composite cable comprises an electric unit, an optical unit, an armor layer and an armor protection layer; the electric unit is positioned on the innermost layer of the single-core photoelectric composite cable; the armored protection layer is located on the outermost layer of the single-core photoelectric composite cable; the armor layer and the optical unit are located between the electric unit and the armor protection layer; the armor layer and the optical unit are located on the same layer; the armor layer is composed of a plurality of armor wires, the armor wires are all spirally wound on the electric units, and at least one optical unit is wound between the two armor wires; when the single-core photoelectric composite cable is repaired, the armored protection layers with the preset lengths on the left side and the right side of the fault point are removed, then the optical unit sections with the preset lengths on the left side and the right side of the fault point are cut off, and the gap of the cut-off position of the optical unit is filled with a replacement optical unit section. The problem that an armor layer needs to be cut off when an optical unit is repaired in the prior art can be solved.

Description

Technical Field

[0001] This invention relates to the field of cable manufacturing technology, and in particular to a single-core optical fiber composite cable and its repair method. Background Technology

[0002] Submarine power cables are typically used for long-distance, high-voltage transoceanic power transmission. These cables usually consist of electrical units and optical units. The electrical units transmit current, while the optical units handle communication data transmission or monitoring functions such as temperature and vibration. In existing single-core submarine cables, optical units are typically integrated into a separate filler layer, with the armor layer on the outer layer. Due to limitations in the optical unit take-up reels, when the fiber optic composite cable exceeds a certain length, multiple optical units need to be connected together. The optical unit joints are extremely prone to damage during production or laying processes. However, current technology requires removing the outer armor layer to repair the optical unit after it fails or breaks. This process is complex, technically challenging, and may cause secondary damage to the optical unit. Summary of the Invention

[0003] This invention provides a single-core optical fiber composite cable and its repair method, which can solve the problem in the prior art that after the optical unit fails or breaks, it is necessary to remove the outer armor layer of the optical unit to repair it. The process of removing the armor layer is complicated and technically difficult, and may also cause secondary damage to the optical unit.

[0004] To address the aforementioned technical problems, embodiments of the present invention provide a single-core optoelectronic composite cable, comprising: an electrical unit, an optical unit, an armor layer, and an armor protection layer; The electrical unit is located in the innermost layer of the single-core optical fiber composite cable; the armor protective layer is located in the outermost layer of the single-core optical fiber composite cable; the armor layer and the optical unit are located between the electrical unit and the armor protective layer; The armor layer is composed of several armor wires, all of which are spirally wound around the electrical unit, and at least one optical unit is wound between two armor wires; the armor layer and the optical unit are located in the same layer. When repairing the single-core optoelectronic composite cable, the location of the fault point of the optical unit in the single-core optoelectronic composite cable is determined; Remove the armor protection layer of a predetermined length on both sides of the fault point, then cut off the optical unit segment of a predetermined length on both sides of the fault point, fill the gap of the cut-off position of the optical unit with a replacement optical unit segment, and connect the two sides of the replacement optical unit segment to the optical unit with optical fiber.

[0005] As a preferred embodiment, the length of the replacement optical unit segment is greater than that of the cut-off optical unit segment.

[0006] As a preferred solution, the electric unit comprises a conductor layer, a conductor shielding layer, an insulating layer, an insulating shielding layer, a semi-conductive water-blocking tape, a metal shielding layer and a non-metal sheath. The conductor layer, the conductor shielding layer, the insulating layer, the insulating shielding layer, the semi-conductive water-blocking tape, the metal shielding layer and the non-metal sheath are arranged in the electric unit in a concentric circle structure in a sequence from inside to outside.

[0007] As a preferred solution, the optical unit comprises an optical fiber, a metal tube and a plastic protective layer. The optical fiber, the metal tube and the plastic protective layer are arranged in the optical unit in a concentric circle structure in a sequence from inside to outside.

[0008] As a preferred solution, the optical unit further comprises an armored metal wire. The armored metal wire is located between the metal tube and the plastic protective layer.

[0009] As a preferred solution, the outer diameter of the optical unit is smaller than the outer diameter of the armored wire.

[0010] As a preferred solution, the number of the armored wires is calculated according to the following formula: ; Wherein, N is the number of the armored wires; D is the outer diameter of the electric unit; d is the outer diameter of the armored wire; k is a twist-in coefficient; and n is the number of the optical units.

[0011] As a preferred solution, the armored protective layer comprises a polypropylene rope. The polypropylene rope is spirally wound on the surface of the armored layer.

[0012] On the basis of the above-mentioned embodiments, another embodiment of the present application provides a repairing method of a single-core optical-electric composite cable, which is suitable for the single-core optical-electric composite cable of the above-mentioned embodiments. The single-core optical-electric composite cable comprises an electric unit, an optical unit, an armored layer and an armored protective layer. The electric unit is located at the innermost layer of the single-core optical-electric composite cable; the armored protective layer is located at the outermost layer of the single-core optical-electric composite cable; the armored layer and the optical unit are located between the electric unit and the armored protective layer; and the armored layer and the optical unit are located at the same layer. The armored layer is composed of a plurality of armored wires, the armored wires are spirally wound on the electric unit, and at least one optical unit is wound between two armored wires. The repairing method comprises the following steps. Determining the fault point position of the optical unit in the single-core optical-electric composite cable. ​The armored protection layer of a preset length on the left and right sides of the fault point is removed, then the optical unit segment of a preset length on the left and right sides of the fault point is cut off, a replacement optical unit segment is filled into the gap at the cut-off position of the optical unit, and the two sides of the replacement optical unit segment are connected with the optical unit in sequence.

[0013] As a preferred solution, the length of the replacement optical unit segment is greater than the cut-off optical unit segment.

[0014] Compared with the prior art, the embodiment of the present application has the following beneficial effects: The present application provides a single-core optical-electric composite cable, comprising: an electric unit, an optical unit, an armored layer, and an armored protection layer; the electric unit is located at the innermost layer of the single-core optical-electric composite cable; the armored protection layer is located at the outermost layer of the single-core optical-electric composite cable; the armored layer and the optical unit are located between the electric unit and the armored protection layer; the armored layer and the optical unit are located at the same layer; the armored layer is composed of a plurality of armored wires, the armored wires are all spirally wound on the electric unit, and at least one optical unit is wound between two armored wires; when repairing the single-core optical-electric composite cable, the position of the fault point of the optical unit in the single-core optical-electric composite cable is determined; the armored protection layer of a preset length on the left and right sides of the fault point is removed, then the optical unit segment of a preset length on the left and right sides of the fault point is cut off, a replacement optical unit segment is filled into the gap at the cut-off position of the optical unit, and the two sides of the replacement optical unit segment are connected with the optical unit in sequence.

[0015] In the single-core optical-electric composite cable of the present application, the electric unit is located at the innermost layer, the armored wires of the armored layer are all spirally wound on the electric unit, and at least one optical unit is wound between two armored wires, and the armored protection layer is located at the outermost layer. In this way, when repairing the optical unit, the armored protection layer on the surface of the left and right sides of the fault point is directly removed, the armored layer and the optical unit are exposed, and then the optical unit on the left and right sides of the fault point is directly cut off. Since the armored layer and the optical unit are located at the same layer, the armored layer does not need to be cut off when repairing the optical unit, and the optical unit is not damaged again. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic diagram of a single-core optical-electric composite cable provided by an embodiment of the present application; Figure 2 is a first structural schematic diagram of an optical unit; Figure 3 is a second structural schematic diagram of an optical unit; Figure 4 is a repair schematic diagram of an optical unit in a single-core optical-electric composite cable. DETAILED DESCRIPTION

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0019] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0020] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0021] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0022] In the description of the embodiments of this application, the terms "multiple" and "several" refer to two or more (including two), similarly, "multiple groups" refer to two or more (including two groups), and "multiple pieces" refer to two or more (including two pieces).

[0023] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0024] Example 1 Please refer to Figure 1 To address the problem in existing technologies where, after an optical unit malfunctions or breaks, the outer armor layer of the optical unit needs to be removed for repair, and the process of removing the armor layer is complex and technically challenging, and may also cause secondary damage to the optical unit, an embodiment of the present invention provides a structural schematic diagram of a single-core optoelectronic composite cable, including: an electrical unit, an optical unit, an armor layer, and an armor protection layer. The electrical unit is located in the innermost layer of the single-core optical-electric composite cable; the armored protective layer is located in the outermost layer of the single-core optical-electric composite cable; the armored layer and the optical unit are located between the electrical unit and the armored protective layer; the armored layer and the optical unit are located in the same layer. The armor layer is composed of several armor wires, all of which are spirally wound around the electrical unit, and at least one optical unit is wound between two armor wires. When repairing the single-core optoelectronic composite cable, the location of the fault point of the optical unit in the single-core optoelectronic composite cable is determined; Remove the armor protection layer of a predetermined length on both sides of the fault point, then cut off the optical unit segment of a predetermined length on both sides of the fault point, fill the gap of the cut-off position of the optical unit with a replacement optical unit segment, and connect the two sides of the replacement optical unit segment to the optical unit with optical fiber.

[0025] Preferably, the length of the replacement optical unit segment is greater than that of the cut-off optical unit segment.

[0026] Preferably, the electrical unit includes: a conductor layer, a conductor shielding layer, an insulating layer, an insulating shielding layer, a semiconducting resistive water strip, a metal shielding layer, and a non-metallic sheath; the conductor layer, conductor shielding layer, insulating layer, insulating shielding layer, semiconducting resistive water strip, metal shielding layer, and non-metallic sheath are arranged in concentric circles in the electrical unit in a sequence from the inside to the outside.

[0027] Preferably, the optical unit includes: an optical fiber, a metal tube, and a plastic protective layer; the optical fiber, the metal tube, and the plastic protective layer are arranged in a concentric circle structure in the optical unit in a sequence from the inside to the outside.

[0028] Preferably, the optical unit further includes: an armored metal wire; the armored metal wire is located between the metal tube and the plastic protective layer.

[0029] Preferably, the outer diameter of the optical unit is smaller than the outer diameter of the armor wire.

[0030] Preferably, the number of armor lines is calculated according to the following formula: ; Where N is the number of armored wires; D is the outer diameter of the electrical unit; and d is the outer diameter of the armored wire. is the twist-in coefficient; n is the number of optical elements.

[0031] Preferably, the armor protective layer comprises: a polypropylene rope; the polypropylene rope is spirally wound around the surface of the armor layer.

[0032] Specifically, existing technologies provide composite technology methods for single-core submarine cable optical units. The optical units are usually composited in a separate filler strip layer, and the armor layer is on the outer layer of the optical unit. The manufacturing process is complex, and if the optical unit fails or breaks, the armor layer needs to be removed for repair. The repair process is complex and technically challenging.

[0033] To address the shortcomings of existing technologies, this invention provides a single-core optical-electric composite cable, comprising at least an electrical unit 1, an optical unit 3, an armor layer 2, and an armor protective layer 4. The electrical unit is located in the innermost layer of the single-core optical-electric composite cable, and the armor protective layer is located in the outermost layer. The armor layer and the optical unit are located between the electrical unit and the armor protective layer. The armor layer consists of multiple armor wires spirally wound around the electrical unit, and at least one optical unit is wound between two armor wires, wherein the outer diameter of the optical unit is 1.0 mm to 2.0 mm smaller than the outer diameter of the armor wire.

[0034] The functions of the electrical unit, optical unit, armor layer, and armor protection layer are as follows: Electrical unit: The core structure for power transmission; Optical unit: carries fiber optic signals to enable transoceanic data transmission; Armor layer: resists external forces such as tensile force, ocean current impact, and dragging by fishing gear during seabed laying, and prevents submarine cable breakage; Armored protective layer: mainly used for corrosion protection, buffering mechanical stress and enhancing structural stability; The armor lines typically consist of N wires. 4. Calculate the outer diameter of the electrical unit (D) and the outer diameter of the armored wire (d). The twist-in factor is typically 1.06, and n represents the number of optical units. This ensures that there are gaps between the armor lines, preventing the optical units from being squeezed.

[0035] The outer diameter of the optical unit is smaller than that of the armor wire, which protects the optical unit from damage during the production or laying of the submarine cable. The armor protective layer is typically made of polypropylene rope spirally wound around the surface of the armor layer.

[0036] The electrical unit typically includes a conductor layer 11, a conductor shielding layer 12, an insulating layer 13, an insulating shielding layer 14, a semi-conductive resistive water strip 15, a metallic shielding layer 16, and a non-metallic sheath 17. The functions of the conductor layer, conductor shielding layer, insulating layer, insulating shielding layer, semi-conductive resistive water strip, metallic shielding layer, and non-metallic sheath are as follows: Conductors: Function for transmitting electric current; Conductor shielding: Smooths the electric field distribution on the conductor surface and prevents partial discharge; requires close contact with the conductor without gaps. Insulation layer: The main insulation barrier, which withstands system voltage and overvoltage; Insulation and shielding: Eliminate the air gap between the insulating surface and the metal shield, and optimize the electric field distribution; Semiconducting resistive water tape: longitudinal water-blocking design, expands and blocks gaps upon contact with water; Metal shielding: serves as a short-circuit current path and also as a radial waterproof layer; Non-metallic sheath: mechanical protection and corrosion resistance.

[0037] Please refer to Figure 2 This is a schematic diagram of the first type of optical unit structure. An optical unit typically consists of an optical fiber 31, a metal tube 32, and a plastic protective layer 33. Please refer to... Figure 3 This is a schematic diagram of the second structure of the optical unit. The optical unit can also have an armored metal wire 34 added between the metal tube and the plastic protective layer to improve the mechanical properties of the optical unit. The metal tube is usually made of 316L stainless steel, but other highly corrosion-resistant metal materials can also be used, provided that they have sufficient compressive strength and bending performance.

[0038] The functions of optical fiber, metal tube, plastic protective layer, and armored metal wire are as follows: Optical fiber: carries optical signals; Metal pipes: mechanical protection, electromagnetic interference resistance, and water barrier; Plastic protective layer: provides radial water resistance and buffers mechanical stress; Armored metal wire: provides tensile strength and compressive protection; Among them, the armored metal wire is generally made of steel wire, copper wire or other alloy metal wire with high corrosion resistance.

[0039] The specific repair method for the single-core optical fiber composite cable is as follows: 1) Determine the location of the fault point of the optical unit in the optical-electric composite cable where it is broken or faulty; Optical unit fault location is generally achieved using technologies such as Optical Time Domain Reflectometry (OTDR), Brillouin Optical Time Domain Reflectometry (BOTDR), and Distributed Fiber Acoustic Sensing (DAS). OTDR: By sending optical pulses into the optical fiber and receiving the reflected light signals, the propagation time of the optical pulses in the fiber is measured to locate the fault point. Brillouin Optical Time Domain Reflectometry (BOTDR): Utilizing the Brillouin scattering effect, real-time monitoring of fiber strain and temperature changes is performed; by comparing monitoring data before and after the fault, the fiber fault point is preliminarily determined. Distributed Fiber Acoustic Sensing (DAS): The optical fiber cable is converted into a virtual microphone to detect the acoustic signals generated by the fault in real time, quickly locating the fault position.

[0040] 2) Remove the surface armor protective layer of a certain length of the optical fiber composite cable on both sides of the fault point, exposing the armor layer and optical unit: 3) Cut off a certain length of optical units on both sides of the fault point, and use OTDR or other equipment to determine the integrity of the remaining units on both sides; wherein, the certain length is 1-2 times the armor stranding pitch length; 4) Provide a replacement optical unit segment with a length greater than that of the optical unit being removed, and fill it into the gap of the removed optical unit; The length of the replacement optical unit segment must be greater than the length of the cut optical unit segment, because the original cut optical unit needs to be filled with a new optical unit, and the optical fiber in the optical fiber splicing device needs to have splicing slack to facilitate optical fiber docking.

[0041] 5) Connect the two sides of the replacement optical unit to the original optical unit using the fiber optic splicing device to complete the fiber optic splicing. Connect the metal tubes of the optical unit with metal connecting wires to ensure electrical connection. If the optical unit contains armored metal wires, the metal wires on both sides need to be connected with metal connecting wires to ensure electrical connection. The fiber optic cables on both sides are spliced ​​using a fiber optic fusion splicer, and the splice point is placed inside the splicing device for protection, sealing, corrosion resistance, and mechanical protection.

[0042] 6) Fix the fiber optic splice device to the armor layer, and restore the remaining exposed parts of the armor layer with a polypropylene rope spiral.

[0043] In one specific embodiment, the present invention uses a single-core 500kV, 2500mm... 2 The DC submarine cable is described in detail as follows: the DC submarine cable consists of an electrical unit 1, an optical unit 3, an armor layer 2, and an armor protection layer 4. The outer diameter of the electrical unit is 150mm, and the electrical unit consists of a conductor, conductor shield, insulation, insulation shield, metal shielding layer, and non-metallic sheath. The armor layer has a diameter of 6.0mm and 71 armor wires. The optical unit has a diameter of 5.0mm and 2 optical wires.

[0044] Single-core 500kV 2500mm 2The DC submarine cable is delivered in lengths of 50km, but the optical unit reel can only support a maximum length of 25km. Therefore, the optical unit connectors need to be fabricated at the 25km mark. If a fault occurs in the optical unit connector during production, the optical unit can be repaired using the optical unit repair method proposed in this invention before the submarine cable is laid and launched.

[0045] Therefore, the present invention provides a single-core optical fiber composite cable, comprising: an electrical unit, an optical unit, an armor layer, and an armor protection layer; the electrical unit is located in the innermost layer of the single-core optical fiber composite cable; the armor protection layer is located in the outermost layer of the single-core optical fiber composite cable; the armor layer and the optical unit are located between the electrical unit and the armor protection layer; the armor layer and the optical unit are located in the same layer; the armor layer is composed of several armor wires, all of which are spirally wound on the electrical unit, and at least one optical unit is wound between two armor wires; when repairing the single-core optical fiber composite cable, the fault point location of the optical unit in the single-core optical fiber composite cable is determined; a predetermined length of armor protection layer is removed from both sides of the fault point, and then a predetermined length of optical unit segment is cut off from both sides of the fault point; a replacement optical unit segment is filled into the gap at the cut-off position of the optical unit, and the two sides of the replacement optical unit segment are optically spliced ​​to the optical unit. In the single-core optical-electric composite cable of the present invention, the electrical unit is located in the innermost layer, the armor wires of the armor layer are spirally wound around the electrical unit, and at least one optical unit is wound between two armor wires. The armor protective layer is located in the outermost layer. Thus, when repairing the optical unit, the armor protective layer on the left and right sides of the fault point can be directly removed, exposing the armor layer and the optical unit. Then, the optical units on the left and right sides of the fault point can be directly cut off. Since the armor layer and the optical unit are on the same layer, it is not necessary to cut off the armor layer again when repairing the optical unit, and no secondary damage to the optical unit will be caused.

[0046] Example 2 Please refer to Figure 4 This is a flowchart illustrating a repair method for a single-core optical fiber composite cable according to an embodiment of the present invention, applicable to the single-core optical fiber composite cable described in the above embodiment; The single-core optoelectronic composite cable includes: an electrical unit, an optical unit, an armor layer, and an armor protection layer; The electrical unit is located in the innermost layer of the single-core optical-electric composite cable; the armored protective layer is located in the outermost layer of the single-core optical-electric composite cable; the armored layer and the optical unit are located between the electrical unit and the armored protective layer; the armored layer and the optical unit are located in the same layer. The armor layer is composed of several armor wires, all of which are spirally wound around the electrical unit, and at least one optical unit is wound between two armor wires. The repair method includes: Determine the location of the fault point in the optical unit of the single-core optoelectronic composite cable; Remove the armor protection layer of a predetermined length on both sides of the fault point, then cut off the optical unit segment of a predetermined length on both sides of the fault point, fill the gap of the cut-off position of the optical unit with a replacement optical unit segment, and connect the two sides of the replacement optical unit segment to the optical unit with optical fiber.

[0047] Preferably, the length of the replacement optical unit segment is greater than that of the cut-off optical unit segment.

[0048] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A single-core optical fiber composite cable, characterized in that, include: Electrical unit, optical unit, armor layer, and armor protection layer; The electrical unit is located in the innermost layer of the single-core optical-electric composite cable; The armored protective layer is located on the outermost layer of the single-core optical-electric composite cable; the armored layer and the optical unit are located between the electrical unit and the armored protective layer; the armored layer and the optical unit are located on the same layer; The armor layer is composed of several armor wires, all of which are spirally wound around the electrical unit, and at least one optical unit is wound between two armor wires. When repairing the single-core optoelectronic composite cable, the location of the fault point of the optical unit in the single-core optoelectronic composite cable is determined; Remove the armor protection layer of a predetermined length on both sides of the fault point, then cut off the optical unit segment of a predetermined length on both sides of the fault point, fill the gap of the cut-off position of the optical unit with a replacement optical unit segment, and connect the two sides of the replacement optical unit segment to the optical unit with optical fiber.

2. The single-core optoelectronic composite cable as described in claim 1, characterized in that, The length of the replacement optical unit segment is greater than that of the cut-off optical unit segment.

3. The single-core optoelectronic composite cable as described in claim 1, characterized in that, The electrical unit includes: a conductor layer, a conductor shielding layer, an insulating layer, an insulating shielding layer, a semi-conductive resistive water strip, a metallic shielding layer, and a non-metallic sheath. The conductor layer, conductor shielding layer, insulating layer, insulating shielding layer, semiconducting resistive water strip, metal shielding layer, and non-metallic sheath are arranged in concentric circles in the electrical unit in a sequence from the inside to the outside.

4. The single-core optoelectronic composite cable as described in claim 1, characterized in that, The optical unit includes: an optical fiber, a metal tube, and a plastic protective layer; The optical fiber, metal tube, and plastic protective layer are arranged in a concentric circle structure in the optical unit in a sequential order from the inside out.

5. The single-core optoelectronic composite cable as described in claim 4, characterized in that, The optical unit further includes: armored metal wires; The armored metal wire is located between the metal tube and the plastic protective layer.

6. The single-core optoelectronic composite cable as described in claim 1, characterized in that, The outer diameter of the optical unit is smaller than the outer diameter of the armor line.

7. The single-core optical fiber composite cable as described in claim 1, characterized in that, The number of armor lines is calculated using the following formula: ； Where N is the number of armored wires; D is the outer diameter of the electrical unit; and d is the outer diameter of the armored wire. is the twist-in coefficient; n is the number of optical elements.

8. The single-core optoelectronic composite cable as described in claim 1, characterized in that, The armor protective layer includes: polypropylene rope; The polypropylene rope is spirally wound around the surface of the armor layer.

9. A method for repairing a single-core optical fiber composite cable, characterized in that, Applicable to the single-core optical-electric composite cable as described in any one of claims 1-8; The single-core optoelectronic composite cable includes: an electrical unit, an optical unit, an armor layer, and an armor protection layer; The electrical unit is located in the innermost layer of the single-core optical-electric composite cable; the armored protective layer is located in the outermost layer of the single-core optical-electric composite cable; the armored layer and the optical unit are located between the electrical unit and the armored protective layer; the armored layer and the optical unit are located in the same layer. The armor layer is composed of several armor wires, all of which are spirally wound around the electrical unit, and at least one optical unit is wound between two armor wires. The repair method includes: Determine the location of the fault point in the optical unit of the single-core optoelectronic composite cable; Remove the armor protection layer of a predetermined length on both sides of the fault point, then cut off the optical unit segment of a predetermined length on both sides of the fault point, fill the gap of the cut-off position of the optical unit with a replacement optical unit segment, and connect the two sides of the replacement optical unit segment to the optical unit with optical fiber.

10. The repair method for a single-core optical fiber composite cable as described in claim 9, characterized in that, The length of the replacement optical unit segment is greater than that of the cut-off optical unit segment.

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