Medium voltage smart cable and method for manufacturing the same

Abstract

The application belongs to the technical field of cable manufacturing, and discloses a medium-voltage intelligent cable and a preparation method thereof. The medium-voltage intelligent cable comprises a center piece and an outer sheath. The center piece comprises at least two cable cores and a temperature monitoring piece arranged in the gap between the cable cores. The temperature monitoring piece comprises a sensing optical fiber and two wire storage pieces. The sensing optical fiber comprises a first region, a second region and a third region along the length direction. The first region and the third region correspond to the outer periphery of the two wire storage pieces, respectively. The length of the temperature monitoring piece is consistent with the length of the cable core and is twisted with the cable core. The sensing optical fiber is used for monitoring the temperature of the cable core. When it is necessary to splice the medium-voltage intelligent cable, the sensing optical fiber wound on the wire storage piece can be pulled out. The sensing optical fiber in the medium-voltage intelligent cable is no longer limited by the length, and the excessive tension on the sensing optical fiber during splicing can be avoided. The splicing work of the sensing optical fiber becomes simple, and the splicing efficiency of the medium-voltage intelligent cable is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cable manufacturing, and in particular to a medium-voltage intelligent cable and a preparation method thereof. Background Art

[0002] With the progress of urban planning, the layout of urban circuits has become more complex. If a single or multiple medium-voltage smart cables used for power supply have problems, it will affect the power supply of an area. The existing method is to embed optical fibers in the cable core of the medium-voltage smart cable and use the characteristics of optical fiber temperature sensing to detect the temperature of the cable core in real time, so as to achieve real-time judgment of the operating status of the medium-voltage smart cable. According to the planning of the laying route, the medium-voltage smart cable needs to be spliced ​​to achieve long-path power transmission. The existing medium-voltage smart cables with embedded optical fibers have an optical fiber length that is consistent with the cable core length, and the optical fiber is prone to breakage due to excessive force. Therefore, when splicing the optical fiber, the staff also need to pay attention to the amount of tension on the optical fiber, which makes the splicing of the optical fiber relatively difficult and requires a lot of energy and time from the staff.

[0003] Therefore, there is an urgent need for a medium voltage intelligent cable and a preparation method thereof to solve the above technical problems. Summary of the Invention

[0004] The first purpose of the present invention is to provide a medium voltage intelligent cable that can solve the problem that optical fibers are easily broken due to stress during splicing, which makes the splicing work relatively difficult and consumes a lot of energy and time of the workers.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A medium voltage intelligent cable, comprising:

[0007] A center piece, the center piece includes at least two cable cores and a temperature monitoring piece placed in the gap between the cable cores, the temperature monitoring piece includes a sensing optical fiber and two wire storage pieces, the sensing optical fiber includes a first region, a second region and a third region along the length direction, the first region and the third region are respectively wound around the outer periphery of the two wire storage pieces, the length of the temperature monitoring piece is consistent with the length of the cable core and is twisted with the cable core, and the sensing optical fiber is used to monitor the temperature of the cable core;

[0008] The outer sheath is sleeved on the outer periphery of the center piece.

[0009] As an optimal technical solution for the medium voltage intelligent cable, the wire storage member is a conical structure.

[0010] As an optimal technical solution for the medium voltage intelligent cable, the wire storage member is made of foamed polyethylene.

[0011] As an optimal technical solution for the medium voltage intelligent cable, the outer ring of the wire storage member is provided with a groove, and the sensing optical fiber is placed in the groove.

[0012] As an optimal technical solution for the medium voltage intelligent cable, the sensing optical fiber includes a core and a flexible sheath, and the flexible sheath is arranged on the outer circumference of the core.

[0013] As an optimal technical solution for the medium voltage intelligent cable, the sensing optical fiber further includes a tensile layer, which is located between the core and the flexible sheath and is formed by braiding a Kevlar material.

[0014] As a preferred technical solution of the medium voltage intelligent cable, the medium voltage intelligent cable further includes an inner sheath, which is extruded and coated on the outer periphery of the center piece.

[0015] As a preferred technical solution of the medium voltage intelligent cable, the medium voltage intelligent cable further includes an armor layer, and the armor layer is placed between the inner protective layer and the outer sheath.

[0016] As a preferred technical solution of the medium voltage intelligent cable, the medium voltage intelligent cable further includes two heat shrinkable protection tubes, which are respectively arranged at both ends of the central piece.

[0017] The second object of the present invention is to provide a method for preparing a medium voltage intelligent cable. To achieve this object, the present invention adopts the following technical solutions:

[0018] A method for preparing a medium-voltage intelligent cable, used for preparing any of the above-mentioned medium-voltage intelligent cables, the method for preparing the medium-voltage intelligent cable comprising the following steps:

[0019] Twisting a plurality of copper wires together to form a conductor, and coating the outer periphery of the conductor with an insulating material to form a cable core;

[0020] Winding the first region and the third region at both ends of the sensing optical fiber with a wire storage member respectively to form a temperature monitoring member;

[0021] Placing the temperature monitoring component in the gap of the cable core, and twisting the temperature monitoring component and the cable core together to form a center piece;

[0022] The outer sheath is formed by covering the outer periphery of the center piece with a sheath material.

[0023] Compared with the prior art, the medium voltage intelligent cable provided by the present invention has the following advantages:

[0024] By providing a storage element to store the sensing optical fiber, the temperature monitoring element and the cable core can be made consistent in length, ensuring the aesthetics of the medium-voltage intelligent cable. When the medium-voltage intelligent cable needs to be spliced, since the first and third regions of the sensing optical fiber are respectively entangled with the two storage elements, the operator can pull out the sensing optical fiber wrapped around the storage elements and then splice the sensing optical fiber and cable core of different medium-voltage intelligent cables. Since the sensing optical fiber is no longer restricted by length, the problem of excessive tension on the sensing optical fiber during splicing can be avoided, making the splicing of the sensing optical fiber easier and effectively improving the splicing efficiency of the medium-voltage intelligent cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic cross-sectional view of the medium voltage intelligent cable provided by the present invention;

[0026] Figure 2 This is a schematic diagram of the assembly of the sensing optical fiber and the wire storage component of the medium voltage intelligent cable provided by the present invention;

[0027] Figure 3 It is a flow chart of the method for preparing the medium voltage intelligent cable provided by the present invention.

[0028] In the picture:

[0029] 1. Center piece; 11. Cable core; 12. Temperature monitoring piece; 121. Sensing optical fiber; 1211. Cable core; 1212. Flexible sheath; 1213. Tensile layer; 122. Wire storage piece; 1221. Groove; 2. Inner sheath; 3. Armor layer; 4. Filler; 5. Outer sheath. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0031] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0034] Example 1

[0035] like Figure 1 and Figure 2 As shown in , this embodiment provides a medium-voltage intelligent cable, including a center piece 1 and an outer sheath 5. The center piece 1 includes at least two cable cores 11 and a temperature monitoring component 12 placed in the gap between the cable cores 11, wherein the temperature monitoring component 12 includes a sensing optical fiber 121 and a wire storage component 122. The sensing optical fiber 121 includes a first region, a second region, and a third region along the length direction, wherein the first region and the third region are respectively wound around the outer periphery of the two wire storage components 122. The length of the temperature monitoring component 12 is consistent with the length of the cable core 11 and is twisted with the cable core 11. The sensing optical fiber 121 is used to monitor the temperature of the cable core 11. The outer sheath 5 is arranged on the outer periphery of the center piece 1. The outer sheath 5 is used to protect the center piece 1, so that the extrusion resistance and friction resistance of the medium-voltage intelligent cable are guaranteed.

[0036] When the medium-voltage intelligent cable provided in this embodiment needs to be spliced, since the first and third regions of the sensing optical fiber 121 are respectively entangled with two wire storage members 122, the operator can pull out the sensing optical fiber 121 wrapped around the wire storage members 122 and then splice the sensing optical fiber 121 and the cable core 11 in different medium-voltage intelligent cables. Since the length of the sensing optical fiber 121 is no longer limited, the problem of excessive tension on the sensing optical fiber 121 during splicing can be avoided, making the splicing of the sensing optical fiber 121 easier and effectively improving the splicing efficiency of the medium-voltage intelligent cable. At the same time, by providing the wire storage members 122 to store the sensing optical fiber 121, the length of the temperature monitoring component 12 and the cable core 11 can be consistent. At the same time, the sensing optical fiber 121 can be pulled out at any time during splicing, which not only ensures the appearance of the medium-voltage intelligent cable but also makes splicing of the medium-voltage intelligent cable easier.

[0037] In this embodiment, the lengths of the first region and the third region are both 700 mm, which makes it easier for workers to connect the sensing optical fiber 121 in the medium voltage intelligent cable.

[0038] In this embodiment, the outer sheath 5 can be made of polyvinyl chloride or polyethylene, which is not specifically limited here.

[0039] In this embodiment, the wire storage element 122 has a tapered structure, which makes it easier to wind the sensing optical fiber 121 around its periphery, reducing the assembly and production difficulty of the medium-voltage intelligent cable. Furthermore, the wire storage element 122 is made of expanded polyethylene, which has high elasticity, moisture resistance, shock resistance, high toughness, and compressibility. Therefore, when the wire storage element 122 is placed within the gaps in the cable core 11, it prevents the outer diameter of the medium-voltage intelligent cable from being excessively large, i.e., it prevents the overall thickness of the medium-voltage intelligent cable from being excessively thick, further ensuring the aesthetic appearance of the medium-voltage intelligent cable. Furthermore, the outer periphery of the wire storage element 122 is provided with a groove 1221, within which the sensing optical fiber 121 is positioned. Specifically, the first and third regions of the sensing optical fiber 121 are respectively wound around the two wire storage elements 122. The provision of the groove 1221 prevents excessive compression of the sensing optical fiber 121, further ensuring the performance of the sensing optical fiber 121. On the other hand, the sensing optical fiber 121 can be clamped in the groove 1221 to fix the sensing optical fiber 121 so that the sensing optical fiber 121 can be more stably wound around the outer periphery of the wire storage member 122.

[0040] Exemplarily, the sensing optical fiber 121 includes a core 1211 and a flexible sheath 1212, wherein the flexible sheath 1212 is disposed around the outer periphery of the core 1211 and is used to protect the core 1211. The flexible sheath 1212 can be made of polyimide, which is not only chemically stable but also has excellent flexibility and high-temperature resistance. The flexibility of the flexible sheath 1212 can reduce the risk of the core 1211 fracturing within the medium-voltage smart cable when bent. The high-temperature resistance of the flexible sheath 1212 prevents damage to the cable core 11 due to overheating, thereby stabilizing the transmission performance of the sensing optical fiber 121, enabling more stable monitoring of the cable core 11 temperature, and ensuring the service life of the core 1211. Of course, other materials can also be used to make the flexible sheath 1212, such as polyethylene, polyvinyl chloride, etc., and are not specifically limited here.

[0041] Preferably, the sensing optical fiber 121 also includes a tensile layer 1213, which is located between the core 1211 and the flexible sheath 1212. The provision of the tensile layer 1213 can improve the tensile resistance of the sensing optical fiber 121, reduce the risk of breakage of the sensing optical fiber 121 when workers connect the sensing optical fiber 121 of the medium-voltage intelligent cable, and further reduce the difficulty of connecting the medium-voltage intelligent cable. Preferably, the tensile layer 1213 is woven from Kevlar. Kevlar is an aramid fiber material with the advantages of high strength, heat resistance, flame retardancy, high toughness, and ease of processing, which can ensure the performance of the tensile layer 1213.

[0042] In this embodiment, the medium-voltage intelligent cable also includes an inner sheath 2, which is extruded and coated around the outer periphery of the centerpiece 1. The provision of the inner sheath 2 prevents the centerpiece 1 from becoming loose, thereby ensuring the compactness of the medium-voltage intelligent cable. Furthermore, the inner sheath 2 can be made of cross-linked polyethylene. Preferably, a filler 4 can be provided in the gap between the centerpiece 1 and the inner sheath 2 to provide a more rounded shape to the medium-voltage intelligent cable. The filler 4 can be made of, without limitation, polyester tape, polypropylene tape, polyester fiber, or asbestos fiber.

[0043] In this embodiment, the medium-voltage intelligent cable also includes an armor layer 3, which is positioned between the inner sheath 2 and the outer jacket 5. The armor layer 3 improves the mechanical strength of the medium-voltage intelligent cable, further ensuring its tensile and compressive resistance. It also protects the inner sheath 2, further reducing mechanical damage to the core 1 within the medium-voltage intelligent cable when subjected to compression. For example, the armor layer 3 can be formed by wrapping a non-magnetic stainless steel tape around the outer periphery of the inner sheath 2 to prevent any impact on the transmission stability of the sensing optical fiber 121.

[0044] Preferably, the medium-voltage intelligent cable further includes two heat-shrinkable protective tubes, one of which is respectively sleeved on each end of the center piece 1. The heat-shrinkable protective tubes can secure the ends of the center piece 1, reducing the risk of the cable core 11, sensing optical fiber 121, and line storage element 122 falling apart, further ensuring the structural stability of the medium-voltage intelligent cable.

[0045] Example 2

[0046] like Figure 3 As shown in , this embodiment provides a method for preparing a medium-voltage intelligent cable, which is used to prepare the medium-voltage intelligent cable in Example 1, wherein the method for preparing the medium-voltage intelligent cable includes the following steps:

[0047] A plurality of copper wires are twisted together to form a conductor, and an insulating material is coated on the outer periphery of the conductor to form a cable core 11; specifically, the insulating material is cross-linked polyethylene.

[0048] The first region and the third region at both ends of the sensing optical fiber 121 are respectively wound with a wire storage member 122 to form a temperature monitoring member 12 .

[0049] The temperature monitoring component 12 is placed in the gap of the cable core 11 , and the temperature monitoring component 12 and the cable core 11 are twisted together to form a central component 1 .

[0050] The outer periphery of the center piece 1 is coated with a sheath material to form an outer sheath 5. Pellets of the sheath material are put into an extruder, which heat-melts and extrude the sheath material particles, and coats the outer periphery of the center piece 1 with the heat-melted sheath material.

[0051] Furthermore, before manufacturing the outer sheath 5, the following steps are also included:

[0052] A heat shrink protective tube is respectively installed on both ends of the center piece 1, and the heat shrink protective tube is heat-shrunk using a hot air gun to fix the two ends of the center piece 1.

[0053] The inner protective material is coated on the outer periphery of the center piece 1 to form an inner protective layer 2, thereby strengthening the protection of the center piece 1. The inner protective material can be made of cross-linked polyethylene.

[0054] A non-magnetic stainless steel tape is wound around the outer periphery of the inner sheath 2 to form the armor layer 3 .

[0055] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A medium voltage intelligent cable, characterized in that: include: A center piece (1), the center piece (1) comprising at least two cable cores (11) and a temperature monitoring piece (12) disposed in a gap between the cable cores (11), the temperature monitoring piece (12) comprising a sensing optical fiber (121) and two line storage pieces (122), the sensing optical fiber (121) comprising a first region, a second region and a third region along a length direction, the first region and the third region being respectively wound around the outer periphery of the two line storage pieces (122), the length of the temperature monitoring piece (12) being consistent with the length of the cable core (11) and being twisted with the cable core (11), the sensing optical fiber (121) being used for monitoring the temperature of the cable core (11); An outer sheath (5) is sleeved on the outer periphery of the center piece (1); The line storage member (122) is a tapered structure; The outer ring of the line storage member (122) is provided with a groove (1221), and the sensing optical fiber (121) is placed in the groove (1221).

2. The medium voltage intelligent cable according to claim 1, characterized in that: The line storage member (122) is made of foamed polyethylene.

3. The medium voltage intelligent cable according to claim 1, characterized in that: The sensing optical fiber (121) comprises a core (1211) and a flexible sheath (1212), wherein the flexible sheath (1212) is sleeved on the outer periphery of the core (1211).

4. The medium voltage intelligent cable according to claim 3, characterized in that: The sensing optical fiber (121) further includes a tensile layer (1213), the tensile layer (1213) being located between the core (1211) and the flexible sheath (1212), and the tensile layer (1213) being formed by braiding a Kevlar material.

5. The medium voltage intelligent cable according to claim 1, characterized in that: The medium voltage intelligent cable further comprises an inner protective layer (2), wherein the inner protective layer (2) is extruded and coated on the outer periphery of the central component (1).

6. The medium voltage intelligent cable according to claim 5, characterized in that: The medium voltage intelligent cable further comprises an armor layer (3), wherein the armor layer (3) is disposed between the inner protective layer (2) and the outer sheath (5).

7. The medium voltage intelligent cable according to any one of claims 1 to 6, characterized in that: The medium voltage intelligent cable further comprises two heat shrinkable protective tubes, which are respectively arranged at two ends of the central component (1).

8. A method for preparing a medium voltage intelligent cable, characterized in that: A method for preparing a medium-voltage intelligent cable according to any one of claims 1 to 7, wherein the method comprises the following steps: Twisting a plurality of copper wires together to form a conductor, and coating the outer periphery of the conductor with an insulating material to form a cable core (11); Winding the first region and the third region at both ends of the sensing optical fiber (121) with a wire storage member (122) to form a temperature monitoring member (12); The temperature monitoring component (12) is placed in the gap of the cable core (11), and the temperature monitoring component (12) and the cable core (11) are twisted together to form a center component (1); The outer sheath (5) is formed by covering the outer periphery of the central member (1) with a sheath material.

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