Medium-voltage intelligent cable and preparation method thereof

Abstract

The invention 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 gaps of 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] 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 planning of urban development, the layout of urban circuits has become complicated. If there is a problem with a single or multiple medium-voltage smart cables used for power supply, it will affect the power supply of an area. Currently, optical fibers are embedded in the cable core of the medium-voltage smart cable, and the temperature of the cable core is detected in real time by using the characteristics of optical fiber temperature sensing, so as to realize 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 realize long-path power transmission. The existing medium-voltage smart cables embedded with optical fibers have the same optical fiber length as 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 needs to pay attention to the problem of the tension on the optical fiber, which makes the splicing of the optical fiber relatively difficult and requires a lot of energy and time of 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 object 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, making the optical fiber splicing work relatively difficult and consuming 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 area, a second area and a third area along the length direction, the first area and the third area are respectively and correspondingly wound around the outer circumference 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 circumference of the center piece.

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

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

[0011] As a preferred 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 a preferred technical solution for the medium voltage intelligent cable, the sensing optical fiber includes a core and a flexible sheath, and the flexible sheath is sleeved on the outer circumference of the core.

[0013] As a preferred technical solution for the medium voltage intelligent cable, the sensing optical fiber further includes a tensile layer, the tensile layer is located between the core and the flexible sheath, and the tensile layer is woven from a Kevlar material.

[0014] As a preferred technical solution of the medium voltage intelligent cable, the medium voltage intelligent cable further comprises an inner sheath, and the inner sheath 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 protective tubes, which are respectively arranged at two ends of the center 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 setting up a wire storage piece to store the sensing optical fiber, the length of the temperature monitoring piece and the cable core can be made consistent, so that the appearance of the medium-voltage intelligent cable is guaranteed. When the medium-voltage intelligent cable needs to be spliced, since the first and third areas of the sensing optical fiber are respectively entangled with the two wire storage pieces, the staff can pull out the sensing optical fiber wound on the wire storage piece, and then splice the sensing optical fiber and the cable core in different medium-voltage intelligent cables. Since the sensing optical fiber is no longer limited by length, when splicing the sensing optical fiber, the problem of excessive tension on the sensing optical fiber can be avoided, making the splicing of the sensing optical fiber simple, and effectively improving the splicing efficiency of the medium-voltage intelligent cable. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0028] In the figure:

[0029] 1. Center piece; 11. Cable core; 12. Temperature monitoring piece; 121. Sensing optical fiber; 1211. Wire 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 in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

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

[0033] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] Embodiment 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, and 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 correspondingly 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, and the outer sheath 5 is sleeved 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] The medium-voltage intelligent cable provided in this embodiment, when it is necessary to connect the medium-voltage intelligent cable, since the first area and the third area of ​​the sensing optical fiber 121 are respectively entangled with the two wire storage pieces 122, the staff can pull out the sensing optical fiber 121 wound on the wire storage piece 122, and then connect the sensing optical fiber 121 and the cable core 11 in different medium-voltage intelligent cables. Since it is no longer limited by the length of the sensing optical fiber 121, when connecting the sensing optical fiber 121, the problem of excessive tension on the sensing optical fiber 121 can be avoided, making the connection work of the sensing optical fiber 121 simple, and effectively improving the connection efficiency of the medium-voltage intelligent cable. At the same time, by setting the wire storage piece 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, when connecting the medium-voltage intelligent cable, the sensing optical fiber 121 can be pulled out at any time, which not only ensures the appearance of the medium-voltage intelligent cable, but also makes the connection of the medium-voltage intelligent cable simpler.

[0037] In this embodiment, the lengths of the first area and the third area are both 700 mm, which makes it easier for workers to connect the sensor 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 member 122 is a tapered structure, which makes it easier for the sensing optical fiber 121 to be wound around the outer periphery of the wire storage member 122, thereby reducing the difficulty of assembling and producing the medium-voltage intelligent cable. Furthermore, the wire storage member 122 is made of foamed polyethylene, which has the characteristics of high elasticity, moisture resistance, shock resistance, high toughness and extrudability. Therefore, the wire storage member 122 is placed in the gap of the cable core 11, which will not make the outer diameter of the medium-voltage intelligent cable too large, that is, the medium-voltage intelligent cable as a whole will not become too thick, and the appearance of the medium-voltage intelligent cable is further guaranteed. Furthermore, the outer periphery of the wire storage member 122 is provided with a groove 1221, and the sensing optical fiber 121 is placed in the groove 1221. Specifically, the first area and the third area of ​​the sensing optical fiber 121 are respectively wound with two wire storage members 122. The provision of the groove 1221, on the one hand, can prevent the sensing optical fiber 121 from being excessively squeezed, and further ensure 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 sleeved on the outer periphery of the core 1211, and the flexible sheath 1212 is used to protect the core 1211. The flexible sheath 1212 can be made of polyimide material, which not only has stable chemical properties, but also has good flexibility and high temperature resistance. The flexible sheath 1212 is flexible and can reduce the risk of the core 1211 breaking inside the medium voltage intelligent cable when it is bent. The flexible sheath 1212 has high temperature resistance, which can prevent the cable core 11 from overheating and causing damage to the core 1211, so that the transmission performance of the sensing optical fiber 121 is stable, and the temperature of the cable core 11 can be monitored more stably, while the service life of the core 1211 is guaranteed. Of course, other materials can also be used to make the flexible sheath 1212, such as polyethylene, polyvinyl chloride, etc., which 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 the sensing optical fiber 121 breaking when the staff connects 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 material. Kevlar is an aramid fiber material with the advantages of high strength, heat resistance, flame retardancy, high toughness and easy 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, wherein the inner sheath 2 is extruded and coated on the outer periphery of the center piece 1. The arrangement of the inner sheath 2 can prevent the center piece 1 from being 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 arranged in the gap between the center piece 1 and the inner sheath 2 to make the medium voltage intelligent cable more round as a whole. The filler 4 can be made of materials such as polyester tape, polypropylene tape, polyester fiber or asbestos fiber, and no specific limitation is made here.

[0043] In this embodiment, the medium voltage intelligent cable further includes an armor layer 3, wherein the armor layer 3 is disposed between the inner sheath 2 and the outer sheath 5. The provision of the armor layer 3 can improve the mechanical strength of the medium voltage intelligent cable, further ensure the tensile strength and extrusion resistance of the medium voltage intelligent cable, and at the same time, the armor layer 3 can also protect the inner sheath 2, further reducing the degree of mechanical damage to the inner center piece 1 of the medium voltage intelligent cable when it is squeezed. Exemplarily, the armor layer 3 can be formed by winding a non-magnetic stainless steel belt around the outer periphery of the inner sheath 2 to avoid affecting the stability of the transmission of the sensing optical fiber 121.

[0044] Preferably, the medium voltage intelligent cable further comprises two heat shrinkable protective tubes, wherein the two heat shrinkable protective tubes are respectively sleeved on both ends of the center piece 1. The heat shrinkable protective tubes can fix both ends of the center piece 1, reduce the risk of the cable core 11, the sensing optical fiber 121 and the line storage piece 122 falling off, and further ensure the stability of the structure of the medium voltage intelligent cable.

[0045] Embodiment 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 comprises 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, and the extruder heat-melts and extrude the sheath material particles, and the heat-melted sheath material is coated on the outer periphery of the center piece 1.

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

[0052] A heat shrink protection tube is respectively set on both ends of the center piece 1, and the heat shrink protection 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, so as to strengthen 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 an armor layer 3 .

[0055] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope 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 wire 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 circumference of the two wire 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 to monitor the temperature of the cable core (11); The outer sheath (5) is sleeved on the outer circumference of the center piece (1).

2. The medium voltage intelligent cable according to claim 1, characterized in that: The wire storage member (122) is a conical structure.

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

4. The medium voltage intelligent cable according to claim 3, characterized in that: The outer ring of the wire storage member (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) comprises a core (1211) and a flexible sheath (1212), wherein the flexible sheath (1212) is 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 comprises a tensile layer (1213), wherein the tensile layer (1213) is located between the core (1211) and the flexible sheath (1212), and the tensile layer (1213) is formed by weaving a Kevlar material.

7. The medium voltage intelligent cable according to claim 1, characterized in that: The medium voltage intelligent cable further comprises an inner sheath (2), wherein the inner sheath (2) is extruded and coated on the outer circumference of the center piece (1).

8. The medium voltage intelligent cable according to claim 7, 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).

9. The medium voltage intelligent cable according to any one of claims 1 to 8, characterized in that: The medium voltage intelligent cable also includes two heat shrinkable protective tubes, which are respectively arranged at two ends of the central component (1).

10. A method for preparing a medium voltage intelligent cable, characterized in that: Used to prepare the medium voltage intelligent cable according to any one of claims 1 to 9, the preparation method of the medium voltage intelligent cable 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) respectively 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 circumference of the center piece (1) is covered with a sheath material to form an outer sheath (5).

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