Communication cable for solar photo-thermal power generation mirror field

Abstract

The utility model discloses a communication cable for a solar photo-thermal power generation mirror field. The communication cable comprises a wire core combination unit, a first wrapping tape layer, a second wrapping tape layer, a shielding layer, an inner sheath, an isolating layer and an outer sheath which are sequentially arranged from inside to outside, the wire core combination unit comprises a cable core, a grounding wire core and a filling strip. The cable core comprises a tinned copper wire conductor and a solid silane crosslinked polyethylene insulating layer from inside to outside; the outer sheath is formed by extruding a halogen-free low-smoke flame-retardant polyolefin sheath material on the isolating layer; the solid silane crosslinked polyethylene insulating layer is uniformly extruded on the tinned copper wire conductor so as to ensure that the characteristic impedance of the cable is uniformly distributed. The cable is good in corrosion resistance, can adapt to severe environment conditions such as extreme temperature change, strong ultraviolet radiation and soil saline-alkaline property, is high in compression resistance and tensile strength, can adapt to direct burial laying requirements in complex terrains, is stable in characteristic impedance, guarantees the transmission efficiency of the cable, and is low in production and manufacturing cost.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to a communication cable for a solar thermal power generation mirror field. Background Technology

[0002] Solar thermal power generation, as a clean and renewable energy technology, plays an increasingly important role in addressing the global energy crisis and environmental pollution. With technological advancements, solar thermal power generation systems, due to their advantages such as high concentration ratio, high operating temperature, short heat transfer path, and low heat loss, are gradually becoming the preferred choice for large-scale commercial applications.

[0003] However, this technology still faces many challenges in practical applications, especially in the crucial area of ​​communication cables. Solar thermal power plants typically occupy vast areas and require numerous heliostats to communicate via cables to ensure the coordinated operation of the entire system. These cables must not only meet basic electrical performance requirements but also withstand harsh environmental conditions such as extreme temperature variations, intense ultraviolet radiation, and saline-alkaline soil. Furthermore, since communication cables for the heliostat field are usually laid directly underground, their compressive and tensile strengths are particularly important.

[0004] Existing communication cables often fail to meet the temperature resistance requirements of extreme cold to extreme heat, leading to performance degradation and even failure under extreme climatic conditions. Alternatively, expensive materials are used to ensure transmission performance under large temperature variations, resulting in high production costs. Secondly, existing communication cables are insufficient in their resistance to ultraviolet radiation and salt alkalis, exhibiting poor corrosion resistance, which accelerates material aging and shortens their lifespan. Furthermore, the structural design of existing communication cables fails to fully consider the specific needs of solar thermal power generation systems; for example, insufficient compressive and tensile strength makes them unsuitable for direct burial in complex terrains, limiting system stability and reliability. In addition, uneven distribution of electrical properties such as characteristic impedance affects signal transmission efficiency and accuracy, consequently impacting the efficiency of the entire power generation system. Utility Model Content

[0005] To overcome the above-mentioned technical defects, this utility model provides a communication cable for solar thermal power generation mirror fields. It has good corrosion resistance and can adapt to harsh environmental conditions such as extreme temperature changes, strong ultraviolet radiation and soil salinity. It also has strong compressive and tensile strength, which can meet the requirements of direct burial in complex terrain. At the same time, the characteristic impedance distribution is uniform and stable, ensuring the transmission efficiency of the cable, and the manufacturing cost is low.

[0006] To solve the above problems, this utility model is implemented according to the following technical solution:

[0007] The communication cable for a solar thermal power generation mirror field described in this utility model includes:

[0008] The cable consists of, from the inside out, a core assembly unit, a first wrapping tape layer, a second wrapping tape layer, a shielding layer, an inner sheath, an isolation layer, and an outer sheath; the core assembly unit includes a cable core, a grounding core, and a filler strip; the cable core includes, from the inside out, a tinned copper conductor and a solid silane cross-linked polyethylene insulation layer; the outer sheath is made of halogen-free, low-smoke, flame-retardant polyolefin sheath material extruded onto the isolation layer;

[0009] The solid silane cross-linked polyethylene insulation layer is uniformly extruded onto the tinned copper wire conductor to ensure a uniform distribution of the cable's characteristic impedance.

[0010] In a preferred embodiment, the filler strip is a cross-linked polyethylene filler strip.

[0011] In a preferred embodiment, the first wrapping tape layer is a polypropylene foam wrapping tape layer.

[0012] In a preferred embodiment, the second wrapping tape layer is an aluminum-plastic composite wrapping tape layer.

[0013] In a preferred embodiment, the shielding layer is made of tin-plated copper wire braid.

[0014] In a preferred embodiment, the diameter of the tinned copper wire used for the braided shielding layer is not less than 0.12 mm, and the braiding density is not less than 80%.

[0015] In a preferred embodiment, a drain wire is also provided between the second wrapping tape layer and the shielding layer so as to weld terminals or connectors when grounding.

[0016] In a preferred embodiment, the inner sheath is a high-density polyethylene inner sheath.

[0017] In a preferred embodiment, the insulating layer is woven from galvanized steel wire.

[0018] In a preferred embodiment, the diameter of the galvanized steel wire used for the braided isolation layer is not less than 0.2 mm, and the braiding density is not less than 80%.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] This utility model provides a communication cable for solar thermal power generation mirror fields. The conductor material is tin-plated copper wire, which improves the cable's corrosion resistance. The cable core insulation layer uses a solid silane cross-linked polyethylene insulation layer. On the one hand, this ensures the stability of conductor spacing and related performance parameters; on the other hand, using silane cross-linked polyethylene as the insulation layer can increase the cable's operating temperature while meeting the cable's electrical transmission performance requirements. This allows the cable to better adapt to harsh environmental conditions such as extreme temperature changes, strong ultraviolet radiation, and soil salinity, while also reducing manufacturing costs. Furthermore, the uniform extrusion of silane cross-linked polyethylene onto the conductor ensures a uniform and stable characteristic impedance distribution. The first wrapping tape layer uses polypropylene foam tape, which reduces the cable's capacitance and ensures the quality of communication signal transmission. The galvanized copper wire braided isolation layer improves the cable's compressive and tensile strength, effectively preventing damage from soil settlement, compression, and other external forces. Finally, a halogen-free, low-smoke, flame-retardant polyolefin sheath is used as the outer sheath, providing better temperature adaptability, salt and alkali resistance, and UV protection. Attached Figure Description

[0021] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0022] Figure 1 This is a structural diagram of a communication cable used in a solar thermal power generation mirror field according to this utility model;

[0023] In the picture:

[0024] 1-Tin-plated copper wire conductor, 2-Solid silane cross-linked polyethylene insulation layer, 3-Filling strip, 4-Grounding core, 5-First wrapping tape layer, 6-Second wrapping tape layer, 7-Drain wire, 8-Shielding layer, 9-Inner sheath, 10-Isolation layer, 11-Outer sheath. Detailed Implementation

[0025] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this specification. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this specification as detailed in the appended claims.

[0026] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application. Unless otherwise defined, the technical or scientific terms used in this specification should be understood in their ordinary sense by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," and similar terms do not indicate a quantity limitation, but rather indicate the presence of one. "A plurality" or "several" indicates two or more. Unless otherwise stated, terms such as "front," "rear," "lower," and / or "upper" are for ease of description only and are not limited to a location or spatial orientation. Terms such as "comprising" or "including" indicate that the elements or objects preceding "comprising" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect.

[0027] The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a” and “the” as used in this specification and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0028] The embodiments described in this specification will now be described in detail.

[0029] like Figure 1 As shown, the communication cable for a solar thermal power generation mirror field according to this utility model includes:

[0030] The cable core assembly unit, first wrapping tape layer 5, second wrapping tape layer 6, shielding layer 8, inner sheath 9, isolation layer 10, and outer sheath 11 are arranged sequentially from the inside out. The cable core assembly unit includes a cable core, a grounding core 4, and a filler strip 3. The cable core includes a tinned copper conductor 1 and a solid silane cross-linked polyethylene insulation layer 2 from the inside out. The outer sheath 11 is a halogen-free, low-smoke, flame-retardant polyolefin sheath material extruded onto the isolation layer 10.

[0031] In this embodiment, a solid silane cross-linked polyethylene insulation layer 2 is uniformly extruded onto the tinned copper wire conductor 1 to ensure that the characteristic impedance distribution of the cable is uniform. This ensures the signal transmission efficiency and accuracy, and thus ensures the efficiency of the entire power generation system.

[0032] It should be noted that tin-plated copper wire is a conductive wire with a layer of tin plated on the surface of pure copper wire. It offers several advantages as a conductor in communication cables used in solar thermal power generation mirror fields. First, tin-plated copper wire possesses excellent conductivity; copper itself is a good conductor, and the tin plating further enhances its conductivity. Second, tin-plated copper wire exhibits good corrosion resistance; the tin layer effectively prevents copper oxidation, thereby extending the cable's service life. Furthermore, tin-plated copper wire also possesses excellent weldability; the low melting point of the tin layer makes welding easier, providing good weldability for both manual and automated welding, ensuring weld quality and reliability. Therefore, this invention uses tin-plated copper wire as the conductor of the cable, providing stable and reliable current transmission while reducing maintenance costs caused by corrosion and oxidation, ensuring the long-term stable operation of the cable.

[0033] In a preferred embodiment, 19 tinned copper wires are arranged in a "1+6+12" pattern, twisted together in the same direction and with the same pitch in one go to form the tinned copper wire conductor 1, which can effectively reduce the diameter and resistance of the cable conductor.

[0034] It should be noted that the cable core insulation layer uses a solid insulation method, which ensures the stability of conductor spacing and related performance parameters. Silane cross-linked polyethylene (XLPE) is a material obtained by grafting silane onto the polyethylene molecular chain and initiating hydrolysis and condensation cross-linking under the action of water and a catalyst. Using it as the core insulation layer of communication cables for solar thermal power generation mirror fields has the following advantages: First, XLPE has excellent heat resistance, allowing for long-term use at 90℃, and even a short-circuit resistance temperature up to 250℃. This enables it to adapt to the harsh environment of solar thermal power generation sites with large diurnal temperature variations and high daytime temperatures. Second, XLPE retains the original good insulation properties of polyethylene, with further increased insulation resistance, a very small dielectric loss tangent, and minimal temperature influence, providing excellent electrical insulation performance. Furthermore, due to the formation of new chemical bonds between macromolecules, the hardness, stiffness, abrasion resistance, and impact resistance of XLPE are all improved, thus compensating for the weakness of polyethylene's susceptibility to cracking under environmental stress. Finally, silane cross-linked polyethylene (XLPE) exhibits strong resistance to acids, alkalis, and oils, and its combustion products are mainly water and carbon dioxide, posing minimal environmental harm and meeting modern fire safety requirements. Therefore, the cable core insulation layer of this invention uses a solid silane cross-linked polyethylene insulation layer 2, providing high-temperature resistance, chemical corrosion resistance, excellent electrical insulation performance, and good mechanical properties, ensuring long-term stable operation of the cable in harsh environments, while also offering low manufacturing costs.

[0035] It should be noted that halogen-free, low-smoke, flame-retardant polyolefin is an environmentally friendly material used in wires and cables, possessing the characteristics of low smoke, halogen-free, and flame retardant properties. Firstly, halogen-free, low-smoke, flame-retardant polyolefin does not produce toxic hydrogen halide gases or other acidic substances during combustion, thus reducing harm to the environment and personnel. Secondly, the flame-retardant properties of this material effectively prevent the spread of flames, protecting the safety of cables and equipment. Furthermore, halogen-free, low-smoke, flame-retardant polyolefin produces less smoke and has lower toxicity in fire situations, helping to protect personnel safety in emergencies. Simultaneously, this material also has good mechanical properties and thermal stability, maintaining its performance at high temperatures, making it suitable for environments with large temperature variations, such as solar thermal power generation fields. Therefore, the cable of this invention uses halogen-free, low-smoke, flame-retardant polyolefin sheath material as the outer sheath 11, providing not only excellent flame-retardant and environmentally friendly performance but also good mechanical strength and heat resistance, enabling the cable to better adapt to harsh environmental conditions such as extreme temperature changes, strong ultraviolet radiation, and soil salinity.

[0036] In one embodiment, the filler strip 3 is a cross-linked polyethylene filler strip. Firstly, cross-linked polyethylene has good heat resistance, insulation properties, and mechanical properties. Using it as filler strip 3 can provide better temperature stability and electrical insulation, ensuring stable operation and long service life of the cable in high-temperature environments. Its high temperature stability also allows it to provide stable insulation performance under various temperature conditions, reducing energy loss and improving power transmission efficiency.

[0037] In a preferred embodiment, the outer diameters of the grounding core 4 and the filler strip 3 are kept consistent to ensure the roundness of the cable core and the stability of the structure.

[0038] In one embodiment, the first wrapping layer 5 is a polypropylene foam tape wrapping layer. Polypropylene foam tape is a lightweight, high-performance foam material. First, polypropylene foam tape is lightweight, reducing the overall weight of the cable and facilitating installation and deployment. Second, it has good resilience and energy absorption capacity, exhibiting excellent physical properties under static and dynamic loads, helping to protect the cable from external impacts and pressures. Furthermore, polypropylene foam tape is virtually non-absorbent, maintaining its performance even in humid environments without damaging the particles, which is particularly important for environments like solar thermal power generation fields that may face harsh weather conditions. Polypropylene foam tape also has good chemical resistance and oil resistance, resisting the erosion of various chemicals and protecting the cable from environmental factors. Simultaneously, the thermal insulation properties of polypropylene foam tape help maintain a stable internal temperature of the cable, preventing overheating. Finally, polypropylene foam tape is recyclable, environmentally friendly, and meets the requirements of sustainable development. Therefore, the cable of this utility model uses polypropylene foam tape as the first wrapping layer 5, which is environmentally friendly, lightweight and durable, can reduce the capacitance of the cable, and can adapt to harsh environments such as high temperature and saline-alkali, so as to ensure the performance and reliability of the cable.

[0039] In one embodiment, the second wrapping layer 6 is an aluminum-plastic composite tape wrapping layer. The aluminum-plastic composite tape is composed of single-sided or double-sided aluminum tape combined with ethylene-acrylic acid copolymer (EAA). The copolymer has good adhesion to the aluminum tape base and forms a strong bond with polyethylene and halogen-free polyolefin (HFPO) sheathing resin, constituting a comprehensive protective layer with good moisture resistance and shielding against external interference. This invention uses aluminum-plastic composite tape as the second wrapping layer, providing reliable moisture resistance, shielding, and chemical protection for the cable. Preferably, the overlap rate of the aluminum-plastic composite tape wrapping layer is not less than 25%.

[0040] In one embodiment, the shielding layer 8 is made of tin-plated copper wire braid. This not only improves the cable's corrosion resistance and conductivity but also enhances its shielding effect, playing a crucial role in ensuring the reliability and stability of communication within the solar thermal power generation mirror field.

[0041] Preferably, the diameter of the tinned copper wire used for braiding the shielding layer 8 is not less than 0.12 mm, and the braiding density is not less than 80%.

[0042] In one embodiment, a drain wire 7 is further provided between the second wrapping tape layer 6 and the shielding layer 8 to allow for soldering of terminals or connectors when grounding.

[0043] In one embodiment, the inner sheath 9 is a high-density polyethylene (HDPE) inner sheath. HDPE has good heat and cold resistance, good chemical stability, and also has high rigidity, toughness, and mechanical strength. This means that in application scenarios such as solar thermal power generation mirrors, where temperature differences are large and the chemical environment is complex, the HDPE inner sheath can provide stable protection, preventing the cable from being affected by extreme temperature changes and chemical corrosion. In addition, HDPE has excellent dielectric properties and good resistance to environmental stress cracking, which helps the cable maintain its performance under external stress and reduces the risk of damage caused by environmental factors. HDPE has better hardness, tensile strength, and creep than low-density polyethylene (LDPE), and better abrasion resistance, electrical insulation, toughness, and cold resistance. This allows the cable to maintain a long service life and stable electrical performance in applications such as solar thermal power generation mirrors, where it may face mechanical wear and low-temperature environments. Therefore, the use of HDPE as the inner sheath 9 of the communication cable in this invention provides excellent physical protection and electrical insulation performance, ensuring the reliability and durability of the cable in harsh environments.

[0044] In one embodiment, the insulating layer 10 is made of galvanized steel wire braid. This improves the cable's compressive and tensile strength.

[0045] Preferably, the galvanized steel wire used to braid the isolation layer 10 has a diameter of not less than 0.2 mm and a braiding density of not less than 80%.

[0046] Compared with the prior art, the beneficial effects of this utility model are:

[0047] This utility model provides a communication cable for solar thermal power generation mirror fields. The conductor material is tin-plated copper wire, which improves the cable's corrosion resistance. The cable core insulation layer is a solid silane cross-linked polyethylene insulation layer 2. On the one hand, this ensures the stability of conductor spacing and related performance parameters; on the other hand, using silane cross-linked polyethylene as the insulation layer can increase the cable's operating temperature and meet the cable's electrical transmission performance requirements, making the cable more adaptable to harsh environmental conditions such as extreme temperature changes, strong ultraviolet radiation, and soil salinity, while also reducing manufacturing costs. In addition, the silane cross-linked polyethylene is uniformly extruded onto the conductor, ensuring a uniform and stable characteristic impedance distribution of the cable. The first wrapping tape layer 5 uses polypropylene foam tape, which reduces the cable's capacitance and ensures the quality of communication signal transmission. The galvanized copper wire braided isolation layer 10 improves the cable's compressive and tensile strength, effectively preventing damage to the cable from soil settlement, compression, and other external forces. Finally, a halogen-free, low-smoke, flame-retardant polyolefin sheath material is used as the outer sheath 11, which provides better temperature adaptability and better resistance to salt and alkali and ultraviolet radiation.

[0048] Other structures of the communication cable used in the solar thermal power generation mirror field described in this embodiment are available in the prior art.

[0049] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A communication cable for a solar thermal power generation mirror field, characterized in that, include: The cable consists of, from the inside out, a core assembly unit, a first wrapping tape layer, a second wrapping tape layer, a shielding layer, an inner sheath, an isolation layer, and an outer sheath; the core assembly unit includes a cable core, a grounding core, and a filler strip; the cable core includes, from the inside out, a tinned copper conductor and a solid silane cross-linked polyethylene insulation layer; the outer sheath is made of halogen-free, low-smoke, flame-retardant polyolefin sheath material extruded onto the isolation layer; The solid silane cross-linked polyethylene insulation layer is uniformly extruded onto the tinned copper wire conductor to ensure a uniform distribution of the cable's characteristic impedance.

2. The communication cable for a solar thermal power generation mirror field according to claim 1, characterized in that: The filler strip is a cross-linked polyethylene filler strip.

3. The communication cable for a solar thermal power generation mirror field according to claim 1, characterized in that: The first wrapping tape layer is a polypropylene foam wrapping tape layer.

4. The communication cable for a solar thermal power generation mirror field according to claim 1, characterized in that: The second wrapping layer is an aluminum-plastic composite wrapping layer.

5. The communication cable for a solar thermal power generation mirror field according to claim 1, characterized in that: The shielding layer is made of tin-plated copper wire braid.

6. The communication cable for a solar thermal power generation mirror field according to claim 5, characterized in that: The diameter of the tinned copper wire used in the braided shielding layer is not less than 0.12 mm, and the braiding density is not less than 80%.

7. The communication cable for a solar thermal power generation mirror field according to claim 1, characterized in that: A drain wire is also provided between the second wrapping tape layer and the shielding layer so that a terminal block or connector can be soldered when grounding.

8. The communication cable for a solar thermal power generation mirror field according to claim 1, characterized in that: The inner sheath is a high-density polyethylene inner sheath.

9. The communication cable for a solar thermal power generation mirror field according to claim 1, characterized in that: The insulating layer is made of galvanized steel wire.

10. The communication cable for a solar thermal power generation mirror field according to claim 9, characterized in that: The diameter of the galvanized steel wire used for the braided isolation layer is not less than 0.2 mm, and the braiding density is not less than 80%.

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