A medium and low voltage cable with intelligent temperature measurement function

Abstract

The utility model discloses a kind of low voltage cable with intelligent temperature measurement function, including cable core and temperature measurement optical fiber unit, cable core includes multiple conductors, inner sheath is equipped outside multiple conductors, and support positioning sleeve is equipped in inner sheath along its axial direction, accommodating through-hole is equipped in the center of support positioning sleeve, and multiple positioning grooves are equipped in the outer side of support positioning sleeve along circumference, conductor is set on support positioning sleeve along positioning groove, and temperature measurement optical fiber unit is set in support positioning sleeve along accommodating through-hole;From inside to outside, shielding layer, reinforcing layer, outer sheath and anti-friction layer are sequentially equipped outside inner sheath, and filling layer is equipped between multiple conductors in inner sheath.The low voltage cable of the utility model not only can reduce manufacturing cost, but also can reduce cable weight, and also has intelligent temperature measurement function by the temperature measurement optical fiber unit configured, to expand the application scenario of low voltage cable, its overall structure is simple, reasonable in design, and is worth promoting and using.

Description

Technical Field

[0001] This utility model relates to the field of power cable technology, specifically a medium- and low-voltage cable with intelligent temperature measurement function. Background Technology

[0002] Power cables are a crucial component of power systems. They are cable products used to transmit and distribute high-power electrical energy in the main power lines. When power cables are laid underground, their potential aging and defects are not easily detected. Over time, overheating or short circuits in the power cables can lead to fires. Early warning through temperature measurement and prompt action can effectively prevent such accidents.

[0003] Medium and low voltage cables typically refer to power cables with a rated voltage of 35 kV and below, and are currently the most widely used type of cable. Most cables on the market use copper cores as conductors. However, the high cost of copper increases both processing and operating costs for manufacturers and users, leading to a growing demand for conductors made from alternative materials. Among metals, aluminum offers advantages such as good conductivity, light weight, and low price. Therefore, replacing copper core cables with aluminum core cables is an inevitable trend. However, ordinary aluminum core cables suffer from poor mechanical properties and corrosion resistance, failing to meet the requirements for medium and low voltage cables.

[0004] In addition, most existing medium and low voltage cables do not have real-time temperature measurement capabilities, making it impossible to detect cable faults in a timely manner. Even cables with temperature measurement capabilities are prone to breakage and deformation when subjected to compression due to the small cross-sectional area of ​​the temperature-measuring optical fiber. Therefore, in order to enable real-time temperature measurement of medium and low voltage cables to meet their usage requirements, it is essential to provide a medium and low voltage cable with intelligent temperature measurement capabilities. Utility Model Content

[0005] The technical problem to be solved by this utility model is to address the problems existing in the background technology, thereby providing a cable with a simple structure and stable performance. Using this cable, not only can the manufacturing cost be reduced, but the weight of the cable can also be reduced and its tensile strength can be enhanced. Under the premise of meeting the power transmission requirements, it also has an intelligent temperature measurement function, thereby expanding the application scenarios of medium and low voltage cables and meeting the usage requirements of medium and low voltage cables. Specifically, it is a medium and low voltage cable with intelligent temperature measurement function.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a medium-low voltage cable with intelligent temperature measurement function, comprising a cable core and a temperature measuring optical fiber unit. The cable core includes multiple conductors, and an inner sheath is provided on the outside of the multiple conductors. A support positioning sleeve is provided along the axial direction inside the inner sheath. A receiving through hole corresponding to the temperature measuring optical fiber unit is provided at the center of the support positioning sleeve. Multiple positioning grooves corresponding to the conductors are provided circumferentially on the outer side of the support positioning sleeve. The conductors are disposed on the support positioning sleeve along the positioning grooves, and the temperature measuring optical fiber unit is disposed inside the support positioning sleeve along the receiving through hole. A shielding layer, a reinforcing layer, an outer sheath, and an anti-friction layer are provided sequentially from the inside to the outside on the outside of the inner sheath, and a filling layer is provided between the multiple conductors inside the inner sheath.

[0007] Furthermore, in the medium-low voltage cable with intelligent temperature measurement function described in this utility model, the conductor is provided with three strands, and the positioning groove is set as a minor arc structure, the number of which corresponds to the conductor. The three positioning grooves are evenly distributed on the outer surface of the supporting positioning sleeve along the circumference. The conductor includes a core and a conductor shielding layer disposed on the core. An insulating layer is disposed on the conductor shielding layer, an insulating shielding layer is disposed on the insulating layer, a semi-conductive buffer layer is disposed on the insulating shielding layer, and a metal shielding layer is disposed on the semi-conductive buffer layer.

[0008] Furthermore, in the medium-low voltage cable with intelligent temperature measurement function described in this utility model, the core is made of multiple strands of a sixth type of flexible aluminum alloy conductor twisted together. The tensile strength of a single aluminum alloy wire of the sixth type of flexible aluminum alloy conductor is ≥90MPa, and its elongation at break is ≥8%. The single aluminum alloy wire is made of aluminum alloy single wire with a wire diameter of 0.15~0.2mm after stranding, re-stranding and heat treatment. Both the conductor shielding layer and the insulating shielding layer are extruded from graphene composite foam shielding material; The insulation layer is made of EPDM rubber extruded; The semi-conductive buffer layer is made by wrapping it with semi-conductive buffer water-blocking tape; The metal shielding layer is woven from annealed soft copper wire.

[0009] Furthermore, in the medium-low voltage cable with intelligent temperature measurement function described in this utility model, the temperature measuring optical fiber unit includes a temperature measuring optical fiber and a non-magnetic protective tube for protecting the temperature measuring optical fiber, and optical fiber filling grease is filled between the temperature measuring optical fiber and the non-magnetic protective tube; wherein, the temperature measuring optical fiber is made of a high-temperature resistant material.

[0010] Furthermore, in the medium-low voltage cable with intelligent temperature measurement function described in this utility model, the filling layer is made of high-density water-resistant yarn filling the gaps between multiple conductors in the inner sheath.

[0011] Furthermore, in the medium- and low-voltage cable with intelligent temperature measurement function described in this utility model, both the inner and outer sheaths are extruded from halogen-free, low-smoke, flame-retardant polyolefin materials.

[0012] Furthermore, in the medium-low voltage cable with intelligent temperature measurement function described in this utility model, the shielding layer is made of tin-plated copper wire braided with a braiding density of not less than 85%.

[0013] Furthermore, in the medium-low voltage cable with intelligent temperature measurement function described in this utility model, the reinforcing layer is made of polyethylene fiber extruded material.

[0014] Furthermore, in the medium-low voltage cable with intelligent temperature measurement function described in this utility model, the anti-friction layer is made of polytetrafluoroethylene material extruded.

[0015] The present invention discloses a medium- and low-voltage cable with intelligent temperature measurement function. The cable core comprises multiple conductors, each conductor including a core body, a conductor shielding layer, an insulation layer, an insulation shielding layer, a semi-conductive buffer layer, and a metal shielding layer. An inner sheath is provided outside the conductors, and from the inside out, a shielding layer, a reinforcing layer, an outer sheath, and an anti-friction layer are sequentially provided outside the inner sheath. A filling layer is provided between the multiple conductors within the inner sheath. A support positioning sleeve is provided axially within the inner sheath, with a receiving through-hole corresponding to the temperature-measuring fiber optic unit at its center. Multiple positioning grooves corresponding to the conductors are provided circumferentially on the outer surface of the support positioning sleeve. The temperature-measuring fiber optic unit is positioned within the support positioning sleeve along the receiving through-hole, while the conductors are positioned on the support positioning sleeve along the positioning grooves. This structure not only reduces manufacturing costs and cable weight but also enhances tensile strength, providing intelligent temperature measurement functionality while meeting power transmission requirements.

[0016] Therefore, it can be seen that by using the medium and low voltage cable described in this utility model, and replacing the existing copper core conductor with the sixth type of flexible aluminum alloy conductor, not only can the manufacturing cost be reduced, but the weight of the cable can also be reduced. Furthermore, through the configured temperature measuring fiber unit, it also has an intelligent temperature measuring function, thereby expanding the application scenarios of medium and low voltage cables and meeting the usage requirements of medium and low voltage cables. Its overall structure is simple and the design is reasonable, making it worthy of promotion and use. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is an enlarged schematic diagram of the conductor structure described in this utility model; Figure 3 This is an enlarged schematic diagram of the temperature-measuring fiber optic unit described in this utility model; Figure 4 This is an enlarged schematic diagram of the support and positioning sleeve described in this utility model.

[0019] The diagram shows: 1-Conductor, 11-Core, 12-Conductor shielding layer, 13-Insulation layer, 14-Insulation shielding layer, 15-Semi-conductive buffer layer, 16-Metallic shielding layer, 2-Temperature measuring fiber unit, 21-Temperature measuring fiber, 22-Non-magnetic protective tube, 23-Fiber optic filling paste, 3-Support positioning sleeve, 31-Accommodation through hole, 32-Positioning groove, 4-Filling layer, 5-Inner sheath, 6-Shielding layer, 7-Reinforcing layer, 8-Outer sheath, 9-Anti-friction layer. Detailed Implementation

[0020] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0021] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," and "right" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "provided with" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] It should be noted that the term "comprising" or any other variation is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] like Figures 1 to 4 As shown, this embodiment provides a medium-low voltage cable with intelligent temperature measurement function, including a cable core and a temperature-measuring optical fiber unit 2. The cable core includes multiple conductors 1, and an inner sheath 5 is provided on the outside of the multiple conductors 1. A support positioning sleeve 3 is provided in the inner sheath 5 along its axial direction. A receiving through hole 31 corresponding to the temperature-measuring optical fiber unit 2 is provided in the center of the support positioning sleeve 3, and multiple positioning grooves 32 corresponding to the conductors 1 are provided in the circumferential direction on the outer side of the support positioning sleeve 3. The conductors 1 are disposed on the support positioning sleeve 3 along the positioning grooves 32, and the temperature-measuring optical fiber unit 2 is disposed in the support positioning sleeve 3 along the receiving through hole 31. A shielding layer 6, a reinforcing layer 7, an outer sheath 8 and an anti-friction layer 9 are provided in sequence from the inside to the outside of the inner sheath 5, and a filling layer 4 is provided between the multiple conductors 1 in the inner sheath 5.

[0025] In the specific manufacturing process, a medium-low voltage cable with intelligent temperature measurement function provided in this embodiment is adopted. The conductor 1 has three conductors, and the positioning groove 32 is set as a minor arc structure, the number of which corresponds to the conductor 1. The three positioning grooves 32 are evenly distributed on the outer surface of the support positioning sleeve 3 along the circumference. The conductor 1 includes a core 11 and a conductor shielding layer 12 disposed on the core 11. An insulation layer 13 is disposed on the conductor shielding layer 12, an insulating shielding layer 14 is disposed on the insulating layer 13, a semi-conductive buffer layer 15 is disposed on the insulating shielding layer 14, and a metal shielding layer 16 is disposed on the semi-conductive buffer layer 15.

[0026] Furthermore, in the medium-low voltage cable with intelligent temperature measurement function provided in this embodiment, the core 11 is formed by stranding multiple strands of a sixth type of flexible aluminum alloy conductor. The tensile strength of a single aluminum alloy wire of the sixth type of flexible aluminum alloy conductor is ≥90MPa, and its elongation at break is ≥8%. The single aluminum alloy wire is made by stranding, re-stranding and heat treatment of aluminum alloy single wire with a wire diameter of 0.15~0.2mm. The conductor shielding layer 12 and the insulating shielding layer 14 are both extruded from graphene composite foam shielding material. The insulating layer 13 is extruded from EPDM rubber. The semi-conductive buffer layer 15 is wrapped with semi-conductive buffer water-blocking tape. The metal shielding layer 16 is braided from annealed soft copper wire.

[0027] Furthermore, using a medium-low voltage cable with intelligent temperature measurement function provided in this embodiment, the temperature measuring optical fiber unit 2 includes a temperature measuring optical fiber 21 and a non-magnetic protective tube 22 for protecting the temperature measuring optical fiber 21, and optical fiber filling paste 23 is filled between the temperature measuring optical fiber 21 and the non-magnetic protective tube 22; wherein, the temperature measuring optical fiber 21 is made of a high temperature resistant material.

[0028] Furthermore, using the medium-low voltage cable with intelligent temperature measurement function provided in this embodiment, the filling layer 4 is filled with high-density water-blocking yarn in the gaps between multiple conductors 1 inside the inner sheath 5; both the inner sheath 5 and the outer sheath 8 are extruded from halogen-free, low-smoke, flame-retardant polyolefin material; the shielding layer 6 is braided from tin-plated copper wire with a braiding density of not less than 85%; the reinforcing layer 7 is extruded from polyethylene fiber material; and the anti-friction layer 9 is extruded from polytetrafluoroethylene material.

[0029] The medium- and low-voltage cable with intelligent temperature measurement function described in this utility model has a core 11 made of multiple strands of a sixth type of flexible aluminum alloy conductor. The tensile strength of a single aluminum alloy wire of the sixth type of flexible aluminum alloy conductor is ≥90MPa, and its elongation at break is ≥8%. The single aluminum alloy wire is made of aluminum alloy single wire with a diameter of 0.15~0.2mm after stranding, re-stranding and heat treatment. In the specific manufacturing process, a high-speed wire bundling machine can be used for stranding. The stranding process is achieved by adjusting the wire tension and the distance between the wire bundling die and the wire separating plate to ensure no wire breakage. The stranded core is re-stranded by the wire bundling machine. The number of strands can be divided into multiple strands according to the size of the cable cross-section. The finished product after stranding can have multiple conductors, the specific number of which can be determined according to the manufacturing needs. The sixth type of flexible aluminum alloy conductor is used, which makes the conductor more flexible and does not break after repeated bending. According to the test, the tensile strength of a single aluminum alloy wire is not less than 90MPa and the elongation at break is not less than 8%. Using the sixth type of flexible aluminum alloy conductor to replace the commonly used copper core conductor can greatly reduce the manufacturing cost.

[0030] The present invention describes a medium- and low-voltage cable with intelligent temperature measurement function. The cable core comprises multiple conductors 1, and each conductor 1 includes a core body 11, a conductor shielding layer 12, an insulation layer 13, an insulation shielding layer 14, a semi-conductive buffer layer 15, and a metallic shielding layer 16. An inner sheath 5 is provided outside the conductors 1, and from the inside to the outside of the inner sheath 5, a shielding layer 6, a reinforcing layer 7, an outer sheath 8, and an anti-friction layer 9 are sequentially provided. A filling layer 4 is provided between the multiple conductors 1 within the inner sheath 5. Simultaneously, along its axis within the inner sheath 5... A supporting positioning sleeve 3 is provided. At the center of the supporting positioning sleeve 3 is a receiving through hole 31 corresponding to the temperature-sensing fiber optic unit 2. Multiple positioning grooves 32 corresponding to the conductor 1 are provided circumferentially on the outer surface of the supporting positioning sleeve 3. The temperature-sensing fiber optic unit 2 is disposed within the supporting positioning sleeve 3 along the receiving through hole 31, while the conductor 1 is disposed on the supporting positioning sleeve 3 along the positioning grooves 32. By adopting the above structure, not only can manufacturing costs be reduced, but the weight of the cable can also be reduced, and its tensile strength can be enhanced. While meeting the requirements for power transmission, it also has an intelligent temperature measurement function. Its advantages are mainly reflected in the following aspects: First, the core 11 uses the sixth type of flexible aluminum alloy conductor to replace the existing copper core. Compared with the existing copper cable, the aluminum alloy cable has the advantages of being lighter, more flexible and more energy-efficient. Its economic efficiency far exceeds that of the copper cable. Compared with the simple aluminum core cable, the aluminum alloy cable can overcome the shortcomings of the aluminum core cable in terms of mechanical properties, bending performance, creep resistance and corrosion resistance, thus becoming safer. It can not only reduce the manufacturing cost, but also meet the needs of medium and low voltage cables. Secondly, a conductor shielding layer 12, an insulation layer 13, an insulation shielding layer 14, a semi-conductive buffer layer 15, and a metal shielding layer 16 are provided outside the core 11. Under the premise of meeting the insulation performance, it not only has good shielding performance, but also enhances the stability of its power transmission. Thirdly, the configured support and positioning sleeve 3 can not only protect the temperature measuring fiber unit 2 and prevent it from breaking or deforming due to squeezing, but also provide support and protection for the conductor 1. Fourth, through the filler layer 4, a better waterproof effect can be achieved; Fifth, both the inner sheath 5 and the outer sheath 8 are made of halogen-free, low-smoke, flame-retardant polyolefin material through extrusion. They not only have excellent flame-retardant and mechanical properties, but also high-speed extrusion performance. Because of their halogen-free characteristics, they can not only avoid the release of harmful gases during combustion, but also delay the time it takes for the cable to burn. In the event of a fire, they can slow down the rate of cable performance degradation, provide power support for a longer period of time, and facilitate timely evacuation and escape of personnel. Sixth, the shielding performance of the cable can be enhanced through the shielding layer 6, effectively preventing electromagnetic interference and reducing the interference of external electromagnetic fields on the internal signals of the cable, thereby reducing the interference of the internal signals of the cable on the external environment. Seventh, the reinforcing layer 7 is made of polyethylene fiber extrusion. Because polyethylene fiber has relatively stable chemical properties, good corrosion resistance and electrical insulation, the cable has corresponding corrosion resistance. Eighth, the anti-friction layer 9 is made of polytetrafluoroethylene (PTFE) material through extrusion. Since PTFE has significant anti-friction properties, the anti-friction layer 9 can enhance the cable's anti-wear performance, thereby increasing the cable's service life.

[0031] In summary, the medium and low voltage cable described in this utility model, which uses a sixth type of flexible aluminum alloy conductor to replace the existing copper core conductor, not only reduces manufacturing costs but also lightens the cable weight. Furthermore, through the configured temperature-measuring fiber optic unit, it also has an intelligent temperature measurement function, thereby expanding the application scenarios of medium and low voltage cables and meeting the usage requirements of medium and low voltage cables. Its overall structure is simple and reasonably designed, making it worthy of promotion and use.

[0032] Other aspects of this utility model that are not detailed herein are all conventional techniques known to those skilled in the art.

[0033] The scope of protection of this utility model is not limited to the technical solutions disclosed in the specific embodiments. The above description is only a preferred embodiment of this utility model and does not limit this utility model. Any minor modifications, equivalent substitutions and improvements made based on the technical solutions of this utility model should be included within the scope of protection of the technical solutions of this utility model.

Claims

1. A medium- and low-voltage cable with intelligent temperature measurement function, comprising a cable core and a temperature-measuring optical fiber unit (2), wherein the cable core comprises multiple conductors (1), characterized in that: An inner sheath (5) is provided on the outside of the multiple conductors (1), and a support positioning sleeve (3) is provided in the inner sheath (5) along its axial direction. A receiving through hole (31) corresponding to the temperature measuring fiber unit (2) is provided in the center of the support positioning sleeve (3), and multiple positioning grooves (32) corresponding to the conductors (1) are provided on the outer side of the support positioning sleeve (3) along the circumferential direction. The conductors (1) are set on the support positioning sleeve (3) along the positioning grooves (32), and the temperature measuring fiber unit (2) is set in the support positioning sleeve (3) along the receiving through hole (31). A shielding layer (6), a reinforcing layer (7), an outer sheath (8) and an anti-friction layer (9) are provided in sequence from the inside to the outside of the inner sheath (5), and a filling layer (4) is provided between the multiple conductors (1) in the inner sheath (5).

2. A medium- and low-voltage cable with intelligent temperature measurement function according to claim 1, characterized in that: The conductor (1) has three sections, and the positioning grooves (32) are configured as a minor arc structure, with the number corresponding to the conductor (1). The three positioning grooves (32) are evenly distributed on the outer surface of the support positioning sleeve (3) along the circumference. The conductor (1) includes a core (11) and a conductor shielding layer (12) disposed on the core (11). An insulating layer (13) is disposed on the conductor shielding layer (12), an insulating shielding layer (14) is disposed on the insulating layer (13), a semi-conductive buffer layer (15) is disposed on the insulating shielding layer (14), and a metal shielding layer (16) is disposed on the semi-conductive buffer layer (15).

3. A medium- and low-voltage cable with intelligent temperature measurement function according to claim 2, characterized in that: The core (11) is made of multiple strands of the sixth type of flexible aluminum alloy conductor. The tensile strength of a single aluminum alloy wire of the sixth type of flexible aluminum alloy conductor is ≥90MPa, and its elongation at break is ≥8%. The single aluminum alloy wire is made by stranding, re-stranding and heat treatment of aluminum alloy single wire with a wire diameter of 0.15 to 0.2mm. Both the conductor shielding layer (12) and the insulating shielding layer (14) are made of graphene composite foam shielding material by extrusion. The insulation layer (13) is made of EPDM rubber extrusion; The semi-conductive buffer layer (15) is made by wrapping a semi-conductive buffer water-blocking tape; The metal shielding layer (16) is woven from annealed soft copper wire.

4. A medium- and low-voltage cable with intelligent temperature measurement function according to claim 1, characterized in that: The temperature measuring fiber unit (2) includes a temperature measuring fiber (21) and a non-magnetic protective tube (22) for protecting the temperature measuring fiber (21), and fiber filling paste (23) is filled between the temperature measuring fiber (21) and the non-magnetic protective tube (22); wherein the temperature measuring fiber (21) is made of a high temperature resistant material.

5. A medium- and low-voltage cable with intelligent temperature measurement function according to claim 1, characterized in that: The filling layer (4) is made of high-density water-resistant yarn and filled in the gaps between multiple conductors (1) inside the inner sheath (5).

6. A medium- and low-voltage cable with intelligent temperature measurement function according to claim 1, characterized in that: Both the inner sheath (5) and the outer sheath (8) are made of halogen-free, low-smoke, flame-retardant polyolefin material through extrusion.

7. A medium- and low-voltage cable with intelligent temperature measurement function according to claim 1, characterized in that: The shielding layer (6) is made of tin-plated copper wire and its weaving density is not less than 85%.

8. A medium- and low-voltage cable with intelligent temperature measurement function according to claim 1, characterized in that: The reinforcing layer (7) is made of polyethylene fiber material through extrusion.

9. A medium- and low-voltage cable with intelligent temperature measurement function according to claim 1, characterized in that: The anti-friction layer (9) is made of polytetrafluoroethylene material through extrusion.

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