Power supply cable for large-span overhead laying and manufacturing method thereof

Abstract

The invention discloses a power supply cable for large-span overhead laying and a manufacturing method of the power supply cable, solves the problem of insufficient electromagnetic shielding capability of a power supply cable in the prior art, and has the beneficial effect of ensuring the shielding performance of the power supply cable, and the specific scheme is as follows: the power supply cable for large-span overhead laying comprises a main wire core, a plurality of groups of wire cores are wound in the circumferential direction of the main wire core, the plurality of groups of wire cores comprise a neutral wire core group and a grounding wire core group, each neutral wire core in the neutral wire core group adopts a metal conductor layer to serve as a shielding structure of a neutral wire and a power supply cable, and the grounding wire core is wound along the winding direction of the plurality of groups of wire cores. At least one communication signal wire core is arranged on at least one side of the grounding wire core group, a tensile partition is arranged on at least one side of the communication signal wire core, a tensile piece is arranged in the tensile partition to ensure the tensile performance of the power supply cable, and the tensile piece is made of a material with an electromagnetic shielding effect.

Description

Technical Field

[0001] The invention relates to the field of power cables, in particular to a power supply cable for large-span overhead laying and a manufacturing method thereof. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] In the industry, when the power cable contains a phase core, a neutral core, and a ground core at the same time, the neutral core and the ground core are usually designed to be insulated cores of extruded insulating materials, and the cable is designed as a multi-core cable structure. The cable has a large outer diameter and is heavy, resulting in insufficient congestion in the laying space, and it is impossible to use the original pipeline or lay it in a small space. Therefore, overhead laying is required, but overhead laying has requirements for the tensile strength of the cable. The existing cables are all wire cores with insufficient tensile strength, and large-span overhead laying cannot be achieved under heavy weight. For this reason, the existing technology adopts direct burial laying, and overhead laying is impossible, which greatly increases the line laying cost.

[0004] The inventors also found that the structure of the low-voltage power cable itself also has defects. The use of plastic insulated power cables without concentric conductors (i.e., without shielding characteristics) in the transmission and distribution circuits of the three-phase system has led to problems such as poor anti-interference performance and poor lightning impact resistance, which are becoming increasingly complex and serious. In particular, the problem must be taken seriously in the selection and operation of cables in power stations, power plants, high-rise buildings, tunnels, subways, and computer rooms.

[0005] In addition, with the development of communication technology, more and more cables are laid, and cable theft prevention is also an increasingly serious problem. Power supply cables are often stolen or cut by accidents, causing great damage to the power supply department or related enterprises and the lives of the masses.

[0006] Finally, conventional cables are laid in the air for a long time, and colored insulation and sheath products will experience material aging and fading after long-term exposure to light, which seriously affects cable inspection and identification as well as operational safety. Summary of the invention

[0007] In view of the deficiencies in the prior art, the object of the present invention is to provide a power supply cable for large-span overhead laying, ensuring that the cable has excellent tensile properties and meets the function of large-length and large-span overhead laying.

[0008] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0009] A power supply cable for large-span overhead laying comprises a main core, wherein the main core is annularly wound to form a plurality of core groups, the plurality of core groups comprising a neutral core group and a grounding core group, each neutral core in the neutral core group adopts a metal conductor layer as a shielding structure for a neutral line and a power supply cable, and along the winding direction of the plurality of core groups, at least one side of the grounding core group is provided with at least one communication signal core, at least one side of the communication signal core is provided with a tensile-resistant spacer, and tensile-resistant members are arranged in the tensile-resistant spacer to ensure the tensile-resistant performance of the power supply cable, and the tensile-resistant members adopt a material having an electromagnetic shielding effect.

[0010] As described above, a large-span overhead power supply cable, in one solution, along the winding direction of the multiple groups of cores, the communication signal cores are arranged on both sides of the grounding core group, and the tensile-resistant partitions are arranged on both sides of each communication signal core. The communication signal core is located between the neutral core group and the grounding core group, and the tensile-resistant partitions are arranged on both sides of the communication signal core to enhance the electromagnetic shielding capability of the communication signal core.

[0011] In another embodiment of the above-mentioned large-span overhead power supply cable, one side of the grounding core group is adjacent to the neutral core group, and the other side is separated from the neutral core group by the communication signal core group. Along the winding direction of the multiple groups of cores, one side of the grounding core group is provided with a plurality of pairs of communication signal cores, and two communication signal cores form a communication signal core group. Both sides of the communication signal core group are provided with the tensile-resistant partitions.

[0012] Along the winding direction of the multiple groups of wire cores, the other side of the grounding wire core group is provided with the tensile-resistant spacer to enhance the electromagnetic shielding capability of the power supply cable.

[0013] As described above, in a power supply cable for large-span overhead laying, two communication signal cores are provided, both of which are connected to a signal receiving device, and the outer sides of the two communication signal cores are different in color to facilitate the distinction between positive and negative poles and quick connection with the signal receiving device.

[0014] As described above, in a power supply cable for large-span overhead laying, the length of the tensile-resistant partition is adapted to the length of the communication signal core, and the tensile-resistant partition has a first side surface and a third side surface that are relatively arranged, and the first side surface and the third side surface are both concave surfaces so as to be able to fit with the adjacent communication signal core or the grounding core group or the neutral core group.

[0015] In the large-span overhead power supply cable as described above, the tensile-resistant partition also includes a second side and a fourth side connected to the first side and the third side respectively, the second side is in contact with the outer side of the main core, and the fourth side is arranged opposite to the second side.

[0016] As described above, in a large-span power supply cable for overhead laying, the tensile barrier comprises two tensile members, the distances between the two tensile members and the central axis of the main line core are different, the distance between the tensile member and the central axis of the main line core is smaller than or larger than the distance between the central axis of the communication signal line core and the central axis of the main line core, and the barrier coating layer is wrapped around the outside of the two tensile members.

[0017] As described above, a large-span overhead power supply cable has an outer sheath extruded on the outer side surfaces of the multiple groups of cores and the communication signal cores, a peeling rope is provided in the outer sheath along the length direction of the power supply cable to facilitate rapid peeling of the outer sheath, the peeling rope is provided close to the inner side surface of the outer sheath, and the outer sheath is circumferentially provided with a weather-resistant outer coating with UV protection function.

[0018] In the large-span overhead power supply cable as described above, the weather-resistant outer layer comprises raw materials including a first polyethylene base material, a second polyethylene base material, a plasticizer, an antioxidant, an ultraviolet absorber and a stabilizer. The weight ratios of the first polyethylene base material, the second polyethylene base material, the plasticizer, the antioxidant, the ultraviolet absorber and the stabilizer are 70 parts to 90 parts, 10 parts to 20 parts, 1.25 parts to 1.75 parts, 0.05 parts to 0.45 parts, 0.65 parts to 0.10 parts and 1 part to 3 parts. By adding antioxidants and ultraviolet absorbers, the antioxidant capacity and anti-ultraviolet capacity of the power supply cable are effectively enhanced, which is conducive to the identification of the power supply cable and ensures the safety of the power supply cable operation.

[0019] As described above, a power supply cable for large-span overhead laying, the main line core includes a conductor layer, the conductor layer is circumferentially extruded with an insulating layer, the moisture absorbing layer is arranged around the insulating layer, the moisture absorbing layer includes an insulating moisture absorbing belt, a moisture absorbing component is arranged in the moisture absorbing belt, the thickness of the moisture absorbing layer is less than the thickness of the insulating layer, and the setting of the insulating moisture absorbing belt effectively absorbs the water vapor remaining in the main line core during the production process, and prevents the outer multiple groups of cores from having quality problems such as oxidation corrosion during the production or operation process.

[0020] The circumferential extrusion package of the neutral wire in the neutral wire core is provided with a neutral wire insulation layer, and the communication signal wire core comprises a communication signal wire core conductor, and the circumferential extrusion package of the communication signal wire core conductor is provided with a communication signal wire core insulation layer.

[0021] In a second aspect, the present invention further provides a method for manufacturing a large-span overhead power supply cable, comprising the following contents:

[0022] Make the main line core, neutral line core group, grounding line core group and communication signal line core respectively;

[0023] Making tensile-resistant partitions, wherein tensile-resistant parts are provided during the making process;

[0024] Along the annular surface of the main core, the neutral core group, the grounding core group, and the communication signal core are arranged, at least one side of the grounding core group is provided with at least one communication signal core, and at least one side of the communication signal core is reserved with a space for setting a tensile barrier. After the arrangement is completed, the neutral core group, the grounding core group, and the communication signal core are sparsely wound to the annular surface of the main core;

[0025] Set up tensile partitions in the reserved space.

[0026] The beneficial effects of the present invention are as follows:

[0027] 1) In the present invention, the annular winding of the main core is provided with multiple groups of cores, and the neutral core of the neutral core group adopts a metal conductor layer, which is not only used as a neutral line, but also has a good electromagnetic shielding effect, which effectively improves the overall shielding effect. In addition, at least one side of the communication signal core is provided with a tensile barrier, and a tensile member is arranged in the tensile barrier. The setting of the tensile member effectively ensures the tensile performance of the power supply cable. The tensile member adopts a material with electromagnetic shielding effect to enhance the electromagnetic shielding effect of the communication signal core. Because the tensile barrier is arranged in the annular direction of the main core, it cooperates with the neutral core group to further enhance the overall electromagnetic shielding capability of the power supply cable. In addition, the tensile barrier ensures that the cable has excellent tensile performance, meets the function of overhead laying with a long length and a long span, and ensures the anti-interference performance and lightning impact resistance of the power supply cable; and the group setting can effectively prevent the mixing and dislocation of components during production, installation and use.

[0028] 2) The present invention takes into account that the communication signal core can be set in a variety of ways. One is to set it on both sides of the grounding core, and the other is to set several pairs of communication signal cores between the grounding core and the neutral core. In order to enhance the electromagnetic shielding capability of the communication signal core, tensile-resistant partitions are respectively set on both sides of the communication signal core or the communication signal core group. Since the communication signal cores are dispersed in the first solution, tensile-resistant partitions are also set between the grounding core and the neutral core in the second solution. The tensile-resistant partitions act separately to effectively and evenly enhance the overall electromagnetic shielding capability of the power supply cable.

[0029] 3) The tensile-resistant barrier structure of the present invention is reasonably arranged and has multiple side surfaces, each of which can be fitted with the wire cores on both sides of the tensile-resistant barrier structure, so that during the production process of the power supply cable, the tensile-resistant barrier structure and the wire cores corresponding to the side can fit completely and tightly without turning over, and the cable structure space is effectively utilized to achieve composite integration of cable functions and ensure the compact size of the cable structure.

[0030] 4) In the present invention, both communication signal cores are connected to the signal receiving device, so that when the communication signal core is cut, damaged or stolen, the signal receiving device cannot receive the signal, and the alarm is controlled to sound an alarm to avoid further damage, thereby enhancing the anti-theft and monitoring functions of the power supply cable and improving the safety and reliability of the power supply cable; and a pair of communication signal cores can be distinguished by color to realize positive and negative poles, which is convenient for quick connection with the signal receiving device.

[0031] 5) In the present invention, a peeling rope is arranged on the outer sheath, so that the outer sheath can be quickly peeled off during the cable construction and installation process, thereby reducing the labor intensity of installation and laying; a weather-resistant outer sheath is arranged circumferentially on the outer sheath, and the raw materials of the weather-resistant outer sheath are reasonably arranged to ensure the basic performance of the weather-resistant outer sheath; and the addition of antioxidants and ultraviolet absorbers can effectively enhance the antioxidant capacity and anti-ultraviolet capacity of the power supply cable, and effectively enhance the weather resistance of the cable without affecting the color and identification of the cable, thereby effectively avoiding the problem that the colored sheath cannot be weather-resistant.

[0032] 6) The present invention can effectively absorb the residual water vapor in the main core during the production process by setting the moisture absorption layer, and prevent the neutral core or the ground core outside the moisture absorption layer from serious quality problems such as oxidation corrosion during the production or operation process, which will affect the cable function and life; the power supply cable adopts a weather-resistant outer sheath with UV protection, which has excellent UV protection function and does not affect the color and identification of the power supply cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0034] Figure 1 It is a cross-sectional schematic diagram of a large-span overhead power supply cable in Embodiment 1 of the present invention.

[0035] Figure 2 It is a cross-sectional schematic diagram of a large-span overhead power supply cable in the second embodiment of the present invention.

[0036] Figure 3 It is a schematic cross-sectional diagram of a tensile barrier in a large-span overhead power supply cable according to one or more embodiments of the present invention.

[0037] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0038] Among them: 1-conductor layer, 2-insulating layer, 3-moisture absorbing layer, 4-neutral wire core, 41-neutral conductor layer, 42-neutral wire insulation layer, 5-tensile barrier, 51-tensile member, 52-barrier coating, 6-communication signal wire core, 61-communication signal wire core conductor, 62-communication signal wire core insulation layer, 7-grounding wire core, 8-outer sheath, 9-weather-resistant outer coating, 10-peeling rope. DETAILED DESCRIPTION

[0039] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0041] As introduced in the background technology, the power supply cable in the prior art has the problem of poor anti-interference ability. In order to solve the above technical problem, the present invention proposes a power supply cable for large-span overhead laying.

[0042] Embodiment 1

[0043] In a typical embodiment of the present invention, a large-span power supply cable for overhead laying includes a main core, wherein the main core is annularly wound to form multiple groups of cores, the multiple groups of cores include a neutral core group and a grounding core group, each neutral core in the neutral core group uses a metal conductor layer as a shielding structure for a neutral line and a power supply cable, and along the winding direction of the multiple groups of cores, at least one side of the grounding core group is provided with at least one communication signal core 6, and at least one side of the communication signal core 6 is provided with a tensile-resistant partition 5, and a tensile member 51 is provided in the tensile-resistant partition 5 to ensure the tensile performance of the power supply cable, and the tensile member 51 is made of a material with electromagnetic shielding effect.

[0044] In this embodiment, reference Figure 1As shown, along the winding direction of the multiple groups of core wires, communication signal core wires 6 are arranged on both sides of the grounding core wire group, and tensile-resistant partitions 5 are arranged on both sides of each communication signal core wire 6. The communication signal core wires are located between the neutral core wire group and the grounding core wire group. The tensile-resistant partitions 5 are arranged on both sides of the communication signal core wires to enhance the electromagnetic shielding capability of the communication signal core wires. In this way, the neutral core wire group, the communication signal core wires, the grounding core wire group and the communication signal core wires are arranged in the annular direction of the main core wires, and the communication core wires are arranged in a sparse winding manner, and the sparse winding pitch is less than or equal to 10 times the inner diameter of the outer sheath, which effectively utilizes the cable structure space, realizes the composite integration of the power supply cable functions, and ensures that the power supply cable structure is compact in size.

[0045] Specifically, two communication signal cores 6 are provided, and both communication signal cores 6 are connected to the signal receiving device. The outer sides of the two communication signal cores are different in color to facilitate the distinction between the positive and negative poles and to quickly connect to the signal receiving device. The signal receiving device is a device that converts the received electrical signal into sound, light, etc. that people can feel, and can specifically be an indicator light. When the indicator light goes out, it means that the communication signal core is disconnected, prompting the staff to check in time, thereby enhancing the anti-theft and monitoring functions of the cable and improving the safety and reliability of the cable line.

[0046] It is easy to understand that the tensile barrier 5 includes two tensile members 51, the distances between the two tensile members 51 and the central axis of the main line core are different, the distance between the tensile member 51 and the central axis of the main line core is less than or greater than the distance between the central axis of the communication signal line core and the central axis of the main line core, and the barrier coating layer 52 is wrapped around the outside of the two tensile members;

[0047] Specifically, the tensile member 51 is made of metal material, which can be galvanized steel wire, and has a shielding function. It can prevent interference attenuation during signal transmission, while ensuring that the power supply cable has excellent tensile performance and meets the function of overhead laying with large lengths and spans; the barrier coating layer 52 is made of weather-resistant polyethylene insulation material and is shaped and extruded on the outside of the tensile member 51 through an extrusion die. It is black in color and can prevent the external environment from corroding the tensile member 51, thereby ensuring the service life of the power supply cable.

[0048] It should be noted that reference Figure 3As shown, the tensile barrier 5 has a dumbbell-like shape, and all four surfaces are arc surfaces. The length of the tensile barrier 5 is adapted to the length of the communication signal core. The tensile barrier has a first side surface and a third side surface that are relatively arranged. The first side surface and the third side surface are both concave surfaces. The arc curvature of the first side surface and the third side surface is greater than the arc amplitude of the neutral core 4, the communication signal core 6 and the grounding core 7 units that are in contact with them, so that the tensile barrier 5 can smoothly fix the neutral core 4 or the communication signal core 6 or the grounding core 7. The tensile barrier 5 also includes a second side surface and a fourth side surface that are respectively connected to the first side surface and the third side surface. The second side surface is fitted with the moisture-proof tape on the outer side surface of the main core, and the fourth side surface is arranged relative to the second side surface, so that it is convenient to fit tightly and completely during the production process without turning over.

[0049] Along the transverse section of the main line core, the maximum width of the tensile barrier 5 is 95% of the maximum diameter of the neutral line core 4, the communication signal line core 6 and the grounding line core 7; the width at the narrowest point is designed based on the remaining gap after the neutral line core 4, the communication signal line core 6 and the grounding line core 7 are filled and the number of tensile barrier 5 to ensure that the components are arranged closely and the average gap is less than or equal to 2 mm.

[0050] In this embodiment, four tensile-resistant baffles 5 are provided, and four relatively independent cavities are formed in the circumferential direction of the main line core to respectively place the neutral line core group, the communication signal line core and the grounding line core group, which can effectively prevent the mixing and misalignment of components during production, installation and use, thereby affecting the cable function.

[0051] Regarding the main line core, the main line core includes a conductor layer 1, which is a twisted copper conductor. The conductor layer 1 is circumferentially extruded with an insulating layer 2. The insulating layer 2 is made of cross-linked polyethylene material. The insulating layer is circumferentially provided with a moisture-absorbing layer 3. The moisture-absorbing layer 3 is a wrapped structure, which is coated on the outside of the insulating layer 2 and can effectively absorb the moisture remaining in the insulating layer 2 during the production process to prevent the neutral core 4 or the grounding core 7 outside the moisture-absorbing layer 3 from having serious quality problems such as oxidation corrosion during the production or operation process, thereby affecting the cable's function and life.

[0052] The material of the moisture absorbing layer 3 is an insulating moisture absorbing tape, and the moisture absorbing component in the moisture absorbing tape is at least one of quicklime, charcoal powder, calcium chloride or other moisture absorbing materials.

[0053] In this embodiment, the neutral core group includes 9 neutral cores 4, and each neutral core 4 includes a neutral conductor layer 41 and a neutral wire insulation layer 42 circumferentially wrapped around the neutral conductor layer 41;

[0054] The neutral conductor layer 41 is made of solid copper wire, copper stranded wire or tinned copper wire, which can be used as a neutral wire and as the overall shielding structure of the cable to reduce the electromagnetic interference of the conductor to the communication signal line core; the neutral wire insulation layer 42 is made of polyethylene insulation material and is black in color.

[0055] Regarding the communication signal core 6, the communication signal core 6 is composed of a communication signal core conductor 61 and a communication signal core insulation layer 62 coated thereon, and the communication signal core conductor 61 is made of solid copper wire. There are two communication signal cores 6, and the insulation color is blue and white to distinguish the positive and negative poles, which are used to connect the signal receiving device.

[0056] The grounding wire core 7 is composed of three bare metal wires, and the metal wires are annealed copper wires or tinned copper wires to increase the cable grounding protection function.

[0057] An outer sheath 8 is extruded on the outer side of multiple groups of wire cores and communication signal wire cores. A stripping rope 10 is arranged in the outer sheath along the length direction of the power supply cable to facilitate rapid stripping of the outer sheath 8. The stripping rope is arranged close to the inner side of the outer sheath. The material of the stripping rope 10 is nylon rope or 4500D polyester yarn. During the construction and installation of the power supply cable, the outer sheath can be quickly stripped off to reduce the labor intensity of installation and laying. The outer sheath is provided with a weather-resistant outer sheath with UV protection in the circumferential direction. The outer sheath 8 is an extruded polyethylene outer sheath. The outer sheath 8 is made of polyethylene material with UV protection and anti-slip properties to ensure that the cable has UV protection properties.

[0058] A transparent weather-resistant outer sheath 9 with UV protection function is coated outside the outer sheath 8, which serves as a protective structure of the outer sheath 8 to enhance the weather resistance of the cable without affecting the color and identification of the cable, and effectively avoids the problem that the colored sheath cannot be weather-resistant. The weather-resistant outer sheath 9 is made of transparent UV-resistant polyethylene plastic with a thickness of 0.1-0.2mm;

[0059] The weather-resistant outer layer includes raw materials including a first polyethylene base material, a second polyethylene base material, a plasticizer, an antioxidant, an ultraviolet absorber and a stabilizer. The weight ratios of the first polyethylene base material, the second polyethylene base material, the plasticizer, the antioxidant, the ultraviolet absorber and the stabilizer are 70 parts to 90 parts, 10 parts to 20 parts, 1.25 parts to 1.75 parts, 0.05 parts to 0.45 parts, 0.65 parts to 0.10 parts and 1 parts to 3 parts. By adding antioxidants and ultraviolet absorbers, the antioxidant capacity and anti-ultraviolet capacity of the power supply cable are effectively enhanced.

[0060] In some examples, the first polyethylene base material is 7042 polyethylene base material, the second polyethylene base material is 5815, the plasticizer is polyethylene wax, 80 parts by weight of 7042 polyethylene base material, 16 parts by weight of 5815 polyethylene base material, 1.5 parts by weight of plasticizer, 0.2 parts by weight of antioxidant, 0.8 parts by weight of UV (ultraviolet)-5411 ultraviolet absorber, and 2 parts by weight of transparent stabilizer, wherein the antioxidant is an existing antioxidant and the transparent stabilizer is transparent stabilizer A-200P.

[0061] A method for manufacturing a power supply cable for large-span overhead laying, comprising the following contents:

[0062] Make the main line core, neutral line core group, grounding line core group and communication signal line core separately:

[0063] A copper rod with excellent performance is selected and a metal monofilament is obtained through an existing drawing process; for a stranded structure conductor, the obtained metal monofilament is arranged in layers according to a set distribution rule, and is twisted to obtain a conductor layer 1; an insulating layer 2 is extruded on the conductor layer 1 to obtain an insulated wire core; a layer of 0.3 mm insulating moisture-absorbing tape is wrapped around the outside of the insulating layer 2, and the moisture-absorbing tape contains quicklime moisture-absorbing components to obtain a main wire core;

[0064] A copper rod with excellent performance is selected to obtain a metal monofilament, which is used as a neutral conductor. A polyethylene insulating material is extruded outside the neutral conductor layer 41 as a neutral line insulating layer 42, which is black in color, to obtain a neutral line core 4;

[0065] A copper rod with excellent performance is selected and a metal monofilament is obtained through a drawing process, which is used as a communication signal line core conductor. Blue and white polyethylene materials are respectively extruded outside two communication signal line core conductors 61 to obtain two communication signal line cores 6;

[0066] A copper rod with excellent performance is selected and a metal monofilament is obtained through a drawing process and used as a grounding wire core 7;

[0067] To make tensile-resistant partitions, tensile-resistant parts are set during the production process:

[0068] A galvanized steel wire is selected as the tensile member 51, and a weather-resistant polyethylene insulating material is selected as the barrier coating layer 52. The barrier coating layer 52 is extruded on the tensile member 51 to obtain a tensile barrier 5 with a special dumbbell shape and size.

[0069] Along the annular surface of the main core, the neutral core group, the grounding core group, and the communication signal core are arranged. Communication signal cores are arranged on both sides of the grounding core group. Setting space is reserved on both sides of the communication signal core. After the arrangement is completed, the neutral core group, the grounding core group, and the communication signal core are sparsely wound to the annular surface of the main core.

[0070] Anti-tensile barriers are provided in the reserved spaces on both sides of the communication signal line core;

[0071] A polyethylene sheath is provided to form an outer sheath 8, and a peel cord 10 is placed longitudinally during the extrusion process;

[0072] The outer protective layer 8 is extruded with transparent UV-proof polyethylene plastic with a thickness of 0.1-0.2 mm to obtain a weather-resistant outer layer 9;

[0073] The preparation method of transparent UV-resistant polyethylene plastic is as follows:

[0074] 80 parts by weight of 7042 polyethylene base material and 16 parts by weight of 5815 polyethylene base material were mixed evenly, placed in a container and stirred at room temperature for 0.5 minutes, then 1.5 parts by weight of plasticizer, 0.2 parts by weight of antioxidant, and 0.8 parts by weight of UV-5411 ultraviolet absorber were added in sequence, stirred rapidly for 0.5 minutes, and the mixed powder was collected at a stirring speed of 40 rpm;

[0075] The composite powder is subjected to an existing screw extrusion molding and granulation process to obtain a transparent UV-proof polyethylene plastic.

[0076] The power supply cable provided in this embodiment adds a neutral core group, which enhances the cable's resistance to electromagnetic interference, power transmission performance in lightning environments and anti-theft functions. Tensile-resistant partitions are arranged to form four relatively independent cavities to respectively place the neutral core group, communication signal core and ground core group, which can effectively prevent the mixing and misalignment of components during production, installation and use, thereby affecting the cable's use function. The tensile members in the prefabricated tensile-resistant partitions can effectively improve the cable's long-length and long-span overhead laying capabilities, and meet the reliable operation of power generation systems serving in various working conditions. A moisture-absorbing layer is arranged to effectively absorb water vapor remaining in the insulating layer during the production process, thereby preventing the neutral core or ground core outside the moisture-absorbing layer from having serious quality problems such as oxidation corrosion during production or operation, thereby affecting the cable's use function and life.

[0077] Embodiment 2

[0078] The difference between this embodiment and the first embodiment is that:

[0079] refer to Figure 2 As shown, one side of the grounding core group is adjacent to the neutral core group, and the other side is separated from the neutral core group by the communication signal core group. Along the winding direction of the multiple groups of cores, two communication signal cores are arranged on one side of the grounding core group. The two communication signal cores form a communication signal core group, and tensile-resistant partitions are arranged on both sides of the communication signal core group. Along the winding direction of the multiple groups of cores, a tensile-resistant partition 5 is also arranged between the other side of the grounding core group and the neutral core group to enhance the electromagnetic shielding capability of the power supply cable.

[0080] Correspondingly, in this embodiment, during the production of the power supply cable, two communication signal cores are placed between the neutral core group and the grounding core group, and tensile-resistant partitions 5 are set on both sides of the two communication signal cores. Tensile-resistant partitions 5 are also set on the other side of the grounding core group away from the communication signal cores.

[0081] Embodiment 3

[0082] The difference between this embodiment and the first and second embodiments is that:

[0083] The neutral wire core only includes the neutral conductor layer and no neutral wire insulation layer.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A power supply cable for large-span overhead laying, characterized in that: It includes a main core, which is annularly wound to form multiple groups of cores. The multiple groups of cores include a neutral core group and a grounding core group. Each neutral core in the neutral core group uses a metal conductor layer as a shielding structure for a neutral line and a power supply cable. Along the winding direction of the multiple groups of cores, at least one side of the grounding core group is provided with at least one communication signal core, and at least one side of the communication signal core is provided with a tensile-resistant partition. Tensile-resistant parts are provided in the tensile-resistant partition to ensure the tensile-resistant performance of the power supply cable, and the tensile-resistant parts are made of materials with electromagnetic shielding effect.

2. A large-span overhead power supply cable according to claim 1, characterized in that: Along the winding direction of the multiple groups of wire cores, the communication signal wire cores are arranged on both sides of the grounding wire core group, and the tensile-resistant spacers are arranged on both sides of each communication signal wire core.

3. A large-span overhead power supply cable according to claim 1, characterized in that: Along the winding direction of the multiple groups of wire cores, a plurality of pairs of communication signal wire cores are arranged on one side of the grounding wire core group, two communication signal wire cores form a communication signal wire core group, and the tensile-resistant barriers are arranged on both sides of the communication signal wire core group; Along the winding direction of the multiple groups of wire cores, the other side of the grounding wire core group is provided with the tensile-resistant barrier.

4. A large-span overhead power supply cable according to claim 1, characterized in that: The communication signal wire cores are provided with two wires, both of which are connected to the signal receiving device, and the outer sides of the two communication signal wire cores are different in color.

5. The large-span overhead power supply cable according to claim 1, characterized in that: The length of the tensile-resistant barrier is adapted to the length of the communication signal core. The tensile-resistant barrier has a first side surface and a third side surface that are relatively arranged. The first side surface and the third side surface are both concave surfaces so as to be able to fit with the adjacent communication signal core or the grounding core group or the neutral core group. The tensile-resistant barrier also includes a second side surface and a fourth side surface that are respectively connected to the first side surface and the third side surface. The second side surface fits with the outer side surface of the main core, and the fourth side surface is arranged opposite to the second side surface.

6. The large-span overhead power supply cable according to claim 1, characterized in that: The tensile barrier comprises two tensile members, the distances between the two tensile members and the central axis of the main line core are different, the distance between the tensile members and the central axis of the main line core is smaller than or larger than the distance between the central axis of the communication signal line core and the central axis of the main line core, and the barrier coating layer is wrapped around the outside of the two tensile members.

7. The large-span overhead power supply cable according to claim 1, characterized in that: An outer sheath is extruded on the outer side surfaces of the multiple groups of wire cores and the communication signal wire cores, a peeling rope is provided in the outer sheath along the length direction of the power supply cable to facilitate rapid peeling of the outer sheath, the peeling rope is arranged close to the inner side surface of the outer sheath, and a weather-resistant outer coating with UV protection is arranged circumferentially on the outer sheath.

8. A large-span overhead power supply cable according to claim 7, characterized in that: The weather-resistant outer layer includes raw materials including a first polyethylene base material, a second polyethylene base material, a plasticizer, an antioxidant, an ultraviolet absorber and a stabilizer. The weight ratios of the first polyethylene base material, the second polyethylene base material, the plasticizer, the antioxidant, the ultraviolet absorber and the stabilizer are: 70 parts to 90 parts, 10 parts to 20 parts, 1.25 parts to 1.75 parts, 0.05 parts to 0.45 parts, 0.65 parts to 0.10 parts, and 1 part to 3 parts.

9. The large-span overhead power supply cable according to claim 1, characterized in that: The main line core comprises a conductor layer, the conductor layer is circumferentially extruded with an insulating layer, a moisture absorbing layer is arranged around the insulating layer, the moisture absorbing layer comprises an insulating moisture absorbing belt, a moisture absorbing component is arranged in the moisture absorbing belt, and the thickness of the moisture absorbing layer is less than the thickness of the insulating layer.

10. A method for manufacturing a large-span overhead power supply cable according to any one of claims 1 to 9, characterized in that: It includes the following: Make the main line core, neutral line core group, grounding line core group and communication signal line core respectively; Making tensile-resistant partitions, wherein tensile-resistant parts are provided during the making process; Along the annular surface of the main core, the neutral core group, the grounding core group, and the communication signal core are arranged, at least one side of the grounding core group is provided with at least one communication signal core, and at least one side of the communication signal core is reserved with a space for setting a tensile barrier. After the arrangement is completed, the neutral core group, the grounding core group, and the communication signal core are sparsely wound to the annular surface of the main core; Set up tensile partitions in the reserved space.

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