Medium-voltage intelligent cable

Abstract

The utility model belongs to the technical field of cable manufacturing, and discloses a medium-voltage intelligent cable, which comprises a central piece and an outer sheath, the central piece comprises at least two cable cores and a temperature monitoring piece arranged in a gap between the cable cores, and the temperature monitoring piece comprises a sensing optical fiber and two wire storage pieces. The sensing optical fiber comprises a first area, a second area and a third area in the length direction, the first area and the third area are correspondingly wound around the peripheries of the two wire storage pieces respectively, the length of the temperature monitoring piece is consistent with the length of the cable core, the temperature monitoring piece and the cable core are mutually twisted, and the sensing optical fiber is used for monitoring the temperature of the cable core. When the medium-voltage intelligent cable needs to be spliced, 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 not limited by the length any more, the situation that the sensing optical fiber bears too large tension during splicing can be avoided, the splicing work of the sensing optical fiber becomes simple, and the splicing efficiency of the sensing optical fiber is improved. And the splicing efficiency of the medium-voltage intelligent cable is improved.

Description

Technical Field

[0001] This utility model relates to the field of cable manufacturing technology, and in particular to a medium-voltage intelligent cable. Background Technology

[0002] With urban planning and development, city circuit layouts are becoming increasingly complex. A problem with a single or multiple medium-voltage smart cables used for power supply can disrupt the power supply of an entire area. Current solutions involve embedding optical fibers into the core of these cables and utilizing the temperature sensing capabilities of the fibers to monitor the core temperature in real time, enabling real-time assessment of the cable's operational status. Depending on the planned route, these medium-voltage smart cables require splicing to achieve long-distance power transmission. However, existing fiber-embedded medium-voltage smart cables have fiber lengths that match the cable core length, and the fibers are prone to breakage under excessive stress. Therefore, splicing the fibers requires careful attention to the tensile force applied to the fibers, making the splicing process relatively difficult and demanding significant time and effort from the workers.

[0003] Therefore, there is an urgent need for a medium-voltage intelligent cable to solve the above-mentioned technical problems. Utility Model Content

[0004] The purpose of this utility model is to provide a medium-voltage intelligent cable that can solve the problem that optical fibers are prone to breakage due to stress during splicing, making optical fiber splicing work relatively difficult and requiring a lot of effort and time from the staff.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A medium-voltage smart cable, comprising:

[0007] A central component, comprising at least two cable cores and a temperature monitoring device placed between the cable cores, the temperature monitoring device comprising a sensing optical fiber and two wire storage devices, the sensing optical fiber comprising a first region, a second region and a third region along its length, the first region and the third region respectively being wound around the outer periphery of the two wire storage devices, the length of the temperature monitoring device being the same as the length of the cable core and twisted together with the cable core, the sensing optical fiber being used to monitor the temperature of the cable core;

[0008] An outer sheath is fitted around the outer periphery of the central component.

[0009] As a preferred technical solution for medium-voltage intelligent cables, the cable storage device has a tapered structure.

[0010] As a preferred technical solution for medium-voltage intelligent cables, the cable storage component is made of foamed polyethylene.

[0011] As a preferred technical solution for medium-voltage smart cables, the outer periphery of the cable storage component is provided with a groove, and the sensing optical fiber is placed in the groove.

[0012] As a preferred technical solution for medium-voltage smart cables, the sensing optical fiber includes a core and a flexible sheath, with the flexible sheath covering the outer periphery of the core.

[0013] As a preferred technical solution for medium-voltage smart cables, the sensing optical fiber further includes a tensile layer located between the core and the flexible sheath, and the tensile layer is formed by braiding Kevlar material.

[0014] As a preferred technical solution for medium-voltage smart cables, the medium-voltage smart cables also include an inner sheath, which is extruded and covers the outer periphery of the central component.

[0015] As a preferred technical solution for medium-voltage smart cables, the medium-voltage smart cables further include fillers, which are disposed between the inner sheath and the center member.

[0016] As a preferred technical solution for medium-voltage smart cables, the medium-voltage smart cables further include an armor layer, which is placed between the inner sheath and the outer sheath.

[0017] As a preferred technical solution for medium-voltage intelligent cables, the medium-voltage intelligent cables also include two heat-shrinkable protective tubes, which are respectively sleeved on both ends of the central component.

[0018] Compared with existing technologies, the medium-voltage intelligent cable provided by this utility model has the following advantages:

[0019] By using storage units to house the sensing optical fibers, the temperature monitoring components can be made the same length as the cable core, ensuring the aesthetic appearance of the medium-voltage smart cable. When splicing the medium-voltage smart cable, since the first and third regions of the sensing optical fiber are wrapped around two storage units respectively, the operator can pull the sensing optical fiber wrapped around the storage units outwards. Then, the sensing optical fibers and cable cores in different medium-voltage smart cables can be spliced. Because the sensing optical fiber is no longer limited by length, excessive tension on the sensing optical fiber can be avoided during splicing, simplifying the splicing process and effectively improving the splicing efficiency of medium-voltage smart cables. Attached Figure Description

[0020] Figure 1 This is a cross-sectional schematic diagram of the medium-voltage intelligent cable provided by this utility model;

[0021] Figure 2 This is a schematic diagram of the assembly of the sensing optical fiber and the storage device of the medium-voltage intelligent cable provided by this utility model.

[0022] Figure 3 This is a flowchart illustrating the preparation method of the medium-voltage intelligent cable provided by this utility model.

[0023] In the picture:

[0024] 1. Central component; 11. Cable core; 12. Temperature monitoring component; 121. Sensing optical fiber; 1211. Wire core; 1212. Flexible sheath; 1213. Tensile layer; 122. Wire storage component; 1221. Groove; 2. Inner sheath; 3. Armor layer; 4. Filler; 5. Outer sheath. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0026] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0029] Example 1

[0030] like Figure 1 and Figure 2 As shown in the illustration, this embodiment provides a medium-voltage smart cable, including a central component 1 and an outer sheath 5. The central component 1 includes at least two cable cores 11 and a temperature monitoring element 12 disposed between the cable cores 11. The temperature monitoring element 12 includes a sensing optical fiber 121 and a wire storage element 122. The sensing optical fiber 121 includes a first region, a second region, and a third region along its length. The first region and the third region are respectively wound around the outer periphery of the two wire storage elements 122. The length of the temperature monitoring element 12 is the same as the length of the cable cores 11 and is twisted together with the cable cores 11. The sensing optical fiber 121 is used to monitor the temperature of the cable cores 11. The outer sheath 5 is sleeved on the outer periphery of the central component 1. The outer sheath 5 is used to protect the central component 1, ensuring the compression resistance and abrasion resistance of the medium-voltage smart cable.

[0031] The medium-voltage smart cable provided in this embodiment allows for easy splicing. Since the first and third regions of the sensing fiber 121 are intertwined with two cable storage units 122, workers can pull the sensing fiber 121 wrapped around the storage units 122 outwards. This simplifies the splicing process and effectively improves the efficiency of medium-voltage smart cable splicing. Furthermore, by using the cable storage units 122 to store the sensing fiber 121, the lengths of the temperature monitoring unit 12 and the cable core 11 can be made consistent. The sensing fiber 121 can also be pulled out at any time during splicing, ensuring the cable's appearance and simplifying the splicing process.

[0032] In this embodiment, the length of both the first and third regions is 700mm, which makes it easier for staff to connect the sensing optical fiber 121 in the medium-voltage smart cable.

[0033] In this embodiment, the outer sheath 5 may be made of polyvinyl chloride or polyethylene, and no specific limitation is made here.

[0034] In this embodiment, the cable storage component 122 has a tapered structure, which facilitates the winding of the sensing optical fiber 121 around its outer periphery, reducing the assembly and production difficulty of the medium-voltage smart cable. Furthermore, the cable storage component 122 is made of foamed polyethylene, which possesses high elasticity, moisture resistance, shock resistance, high toughness, and compressibility. Therefore, the cable storage component 122, placed within the gap of the cable core 11, prevents the outer diameter of the medium-voltage smart cable from becoming excessively large, thus ensuring the overall appearance of the cable. Furthermore, the outer periphery of the cable storage component 122 is provided with a groove 1221, within which the sensing optical fiber 121 is placed. Specifically, the first and third regions of the sensing optical fiber 121 are respectively wound around two cable storage components 122. The groove 1221, on the one hand, prevents the sensing optical fiber 121 from being excessively compressed, further ensuring the performance of the sensing optical fiber 121. On the other hand, the sensing fiber 121 can be inserted into the groove 1221 to fix the sensing fiber 121, so that the sensing fiber 121 can be more stably wound around the outer periphery of the wire storage component 122.

[0035] For example, the sensing optical fiber 121 includes a core 1211 and a flexible sheath 1212, wherein the flexible sheath 1212 is fitted 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 not only has stable chemical properties but also good flexibility and high-temperature resistance. The flexibility of the flexible sheath 1212 reduces the risk of the core 1211 breaking internally when the medium-voltage smart cable is bent. The high-temperature resistance of the flexible sheath 1212 prevents the core 11 from overheating and damaging it, thus stabilizing the transmission performance of the sensing optical fiber 121 and enabling more stable monitoring of the core 11's temperature, while also 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., without specific limitations.

[0036] Preferably, the sensing optical fiber 121 further includes a tensile layer 1213, which is located between the core 1211 and the flexible sheath 1212. The tensile layer 1213 improves the tensile strength of the sensing optical fiber 121, reducing the risk of breakage during splicing of the sensing optical fiber 121 in medium-voltage smart cables, and further reducing the difficulty of splicing medium-voltage smart cables. Preferably, the tensile layer 1213 is woven from Kevlar material. Kevlar is an aramid fiber material with advantages such as high strength, heat resistance, flame retardancy, high toughness, and ease of processing, ensuring the performance of the tensile layer 1213.

[0037] In this embodiment, the medium-voltage smart cable also includes an inner sheath 2, which is extruded and covers the outer periphery of the central component 1. The inner sheath 2 prevents the central component 1 from loosening, ensuring the compactness of the medium-voltage smart cable. Further, the inner sheath 2 can be made of cross-linked polyethylene. Preferably, a filler 4 can be provided in the gap between the central component 1 and the inner sheath 2 to make the medium-voltage smart cable more rounded overall. The filler 4 can be made of materials such as polyester tape, polypropylene tape, polyester fiber, or asbestos fiber, without specific limitations.

[0038] In this embodiment, the medium-voltage smart cable further includes an armor layer 3, which is positioned between the inner sheath 2 and the outer sheath 5. The armor layer 3 enhances the mechanical strength of the medium-voltage smart cable, further ensuring its tensile and compressive strength. Simultaneously, the armor layer 3 protects the inner sheath 2, further reducing the degree of mechanical damage to the internal central component 1 when subjected to compression. For example, the armor layer 3 can be formed by wrapping a non-magnetic stainless steel strip around the outer periphery of the inner sheath 2, avoiding any impact on the stability of the sensing fiber optic cable 121 transmission.

[0039] Preferably, the medium-voltage smart cable also includes two heat-shrinkable protective tubes, which are respectively fitted onto both ends of the central component 1. The heat-shrinkable protective tubes can fix both ends of the central component 1, reducing the risk of the cable core 11, sensing optical fiber 121, and cable storage component 122 falling off, and further ensuring the stability of the medium-voltage smart cable structure.

[0040] like Figure 3 As shown in the figure, this embodiment provides a method for preparing a medium-voltage smart cable, which is used to prepare the above-mentioned medium-voltage smart cable. The method for preparing the medium-voltage smart cable includes the following steps:

[0041] Multiple copper wires are twisted together to form a conductor, and an insulating material is wrapped around the conductor to form a cable core 11; specifically, the insulating material is cross-linked polyethylene.

[0042] The first and third regions at both ends of the sensing optical fiber 121 are respectively wound with a wire storage device 122 to form a temperature monitoring device 12.

[0043] The temperature monitoring element 12 is placed in the gap of the cable core 11, and the temperature monitoring element 12 and the cable core 11 are twisted together to form the center element 1.

[0044] A sheath material is wrapped around the outer periphery of the center part 1 to form an outer sheath 5. Particles of the sheath material are placed in an extruder, which heat-melts and extrudes the sheath material particles, thus wrapping the outer periphery of the center part 1 with the heat-melted sheath material.

[0045] Furthermore, the following steps are included before the outer sheath 5 is manufactured:

[0046] A heat-shrinkable protective tube is fitted onto each end of the central component 1. A heat-shrinkable protective tube is then heat-shrinked using a hot air gun to fix the two ends of the central component 1.

[0047] An inner protective layer 2 is formed by covering the outer periphery of the central component 1 with an inner protective material, thereby enhancing the protection of the central component 1. The inner protective material can be made of cross-linked polyethylene.

[0048] Non-magnetic stainless steel strips are wrapped around the outer periphery of the inner protective layer 2 to form the armor layer 3.

[0049] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A medium-voltage intelligent cable, characterized in that, include: A central component (1) includes at least two cable cores (11) and a temperature monitoring device (12) placed between the cable cores (11). The temperature monitoring device (12) includes a sensing optical fiber (121) and two wire storage devices (122). The sensing optical fiber (121) includes a first region, a second region and a third region along its length. The first region and the third region are respectively wound around the outer periphery of the two wire storage devices (122). The length of the temperature monitoring device (12) is the same as the length of the cable cores (11) and is twisted with the cable cores (11). The sensing optical fiber (121) is used to monitor the temperature of the cable cores (11). The outer sheath (5) is fitted around the outer periphery of the central component (1).

2. The medium-voltage intelligent cable according to claim 1, characterized in that, The wire storage device (122) has a conical structure.

3. The medium-voltage intelligent cable according to claim 2, characterized in that, The wire storage component (122) is made of foamed polyethylene.

4. The medium-voltage intelligent cable according to claim 3, characterized in that, The outer periphery of the wire storage device (122) is provided with a groove (1221), and the sensing optical fiber (121) is placed in the groove (1221).

5. The medium-voltage intelligent cable according to claim 1, characterized in that, The sensing optical fiber (121) includes a core (1211) and a flexible sheath (1212), the flexible sheath (1212) being sleeved on the outer periphery of the core (1211).

6. The medium-voltage intelligent cable according to claim 5, characterized in that, The sensing optical fiber (121) further includes a tensile layer (1213), which is located between the core (1211) and the flexible sheath (1212). The tensile layer (1213) is woven from Kevlar material.

7. The medium-voltage intelligent cable according to claim 1, characterized in that, The medium-voltage smart cable also includes an inner sheath (2), which is extruded and covers the outer periphery of the central component (1).

8. The medium-voltage intelligent cable according to claim 7, characterized in that, The medium-voltage smart cable also includes a filler (4), which is disposed between the inner sheath (2) and the center member (1).

9. The medium-voltage intelligent cable according to claim 8, characterized in that, The medium-voltage smart cable also includes an armor layer (3), which is placed between the inner sheath (2) and the outer sheath (5).

10. The medium-voltage intelligent cable according to any one of claims 1-9, characterized in that, The medium-voltage smart cable also includes two heat-shrinkable protective tubes, which are respectively sleeved on both ends of the central component (1).

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