Energy-saving and environment-friendly polypropylene insulated high-voltage cable

Abstract

The utility model discloses an energy-saving environment-friendly polypropylene insulation high-voltage cable, and belongs to the technical field of medium-voltage cables. The cable comprises a cable core and a protective sleeve body, the cable core comprises a conductor and a shielding structure wrapping the conductor, the conductor comprises a circular monofilament located on the inner layer and a tile-shaped monofilament located on the outer layer, and a non-compression mixed twisted layer is formed at the junction of the tile-shaped monofilament and the circular monofilament; the cable core is sleeved with the protection sleeve body, the protection sleeve body comprises an isolation layer, an armor layer and an outer sheath which are sequentially arranged in a nested mode from inside to outside, the armor layer comprises flat aluminum alloy wires and an aluminum alloy belt, the flat aluminum alloy wires are wound on the isolation layer in a forward rotation mode, the aluminum alloy belt is bundled on the flat aluminum alloy wires in a reverse rotation mode, and the flat aluminum alloy wires are wound on the outer sheath. And the outer sheath comprises a halogen low-smoke flame-retardant polyolefin protective layer, and the halogen low-smoke flame-retardant polyolefin protective layer is arranged on the armor layer in a sleeving manner. According to the utility model, the comprehensive performance of the armor layer of the conductor can be improved.

Description

Technical Field

[0001] This utility model relates to the field of medium-voltage cable technology, and in particular to an energy-saving and environmentally friendly polypropylene insulated high-voltage cable. Background Technology

[0002] Currently, the power cables used in my country's new energy power transmission fields such as wind power and photovoltaic power generation are designed, manufactured, and sold in accordance with the national standard GB / T 12706 "Extruded Insulated Power Cables and Accessories with Rated Voltage of 1kV to 35kV".

[0003] The selected wires and cables are YJV and VV series wires and cables. The conductors of these cables have low flexibility and bending resistance, and the tensile and compressive strength of the armor layer is not strong. Utility Model Content

[0004] In view of this, it is necessary to provide an energy-saving and environmentally friendly polypropylene insulated high-voltage cable to solve the problem of poor overall performance of existing multi-series wires and cables.

[0005] This utility model provides an energy-saving and environmentally friendly polypropylene insulated high-voltage cable, comprising:

[0006] The cable core includes a conductor and a shielding structure covering the conductor. The conductor includes a circular monofilament in the inner layer and a corrugated monofilament in the outer layer. A non-compacted stranded layer is formed at the junction of the corrugated monofilament and the circular monofilament.

[0007] A protective sheath is fitted onto the cable core. The protective sheath includes an isolation layer, an armor layer, and an outer sheath nested from the inside out. The armor layer includes flat aluminum alloy wires and aluminum alloy strips. The flat aluminum alloy wires are wound in a clockwise spiral around the isolation layer, and the aluminum alloy strips are wrapped in a counterclockwise spiral around the flat aluminum alloy wires. The outer sheath includes a halogenated low-smoke flame-retardant polyolefin sheath, which is fitted onto the armor layer.

[0008] Furthermore, the circular monofilament and the tile-shaped monofilament are copper wires with an oxygen content of less than or equal to 0.0010%.

[0009] Furthermore, the outer sheath also includes polypropylene tack strips and a polyethylene protective layer. Three polypropylene tack strips are wound around the aluminum alloy strip, and the polyethylene protective layer is disposed between the polypropylene tack strips and the halogenated low-smoke flame-retardant polyolefin sheath.

[0010] Furthermore, the isolation layer is a polyethylene isolation layer.

[0011] Furthermore, the shielding structure includes a shielding base sleeve and an electrical shielding sleeve nested from the inside out. The shielding base sleeve covers the conductor, and the electrical shielding sleeve includes a copper alloy strip, a semi-conductive strip, a semi-conductive copper-plastic strip, and a semi-conductive polyolefin inner sheath arranged from the inside out.

[0012] Furthermore, the shielding base sleeve includes, from the inside out, a polypropylene inner shielding layer, a polypropylene insulating layer, and a polypropylene outer shielding layer.

[0013] Furthermore, the polypropylene inner shielding layer, polypropylene insulating layer, and polypropylene outer shielding layer are non-crosslinked thermoplastic polypropylene layers.

[0014] Furthermore, a filler layer is provided between the isolation layer and the semi-conductive polyolefin inner sheath.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] (1) This utility model discloses an energy-saving and environmentally friendly polypropylene insulated high-voltage cable, comprising a cable core, which includes a conductor and a shielding structure covering the conductor. The conductor includes a circular monofilament in the inner layer and a corrugated monofilament in the outer layer. A non-compacted stranded layer is formed at the junction of the corrugated monofilament and the circular monofilament. The circular monofilament has low contact resistance and good conductivity, which can provide good conductivity for the conductor. The corrugated monofilament refers to a corrugated monofilament with a tile shape. The corrugated monofilament has a large surface area, which can increase the flexibility and bending resistance of the conductor. The non-compacted stranded layer is made of corrugated monofilament and circular monofilament using a non-compacted stranding process. The non-compacted stranded layer can effectively maintain the flexibility of the conductor, allowing the cable to withstand certain bending and stretching during use without damaging the wire.

[0017] (2) The present invention provides an energy-saving and environmentally friendly polypropylene insulated high-voltage cable, including a protective sleeve, which is sleeved on the cable core to protect the cable core. The protective sleeve includes an isolation layer, an armor layer and an outer sheath arranged in sequence from the inside to the outside. The isolation layer is used to separate the cable core from the armor layer or the outer sheath, so that the cable core has good electrical insulation and ensures the safe operation of the high-voltage cable in a high-voltage environment. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 This is a cross-sectional schematic diagram of the entire utility model;

[0020] Figure 2 This is a cross-sectional schematic diagram of the protective sleeve in this utility model;

[0021] Figure 3 yes Figure 2 A magnified structural diagram of point B;

[0022] Figure 4 This is a schematic diagram of the cross-section of the cable core in this utility model;

[0023] Figure 5 yes Figure 4 A magnified structural diagram of point A.

[0024] In the diagram, 100 is the cable core; 110 is the conductor; 111 is the round monofilament; 112 is the corrugated monofilament; 113 is the non-compacted stranded layer; 120 is the shielding structure; 121 is the shielding base; 121a is the polypropylene inner shielding layer; 121b is the polypropylene insulation layer; 121c is the polypropylene outer shielding layer; 122 is the electrical shielding sleeve; 122a is the copper alloy tape; 122b is the semi-conductive tape; 122c is the semi-conductive copper-plastic tape; and 122d is the semi-conductive polyolefin inner sheath.

[0025] 200. Protective sheath; 210. Isolation layer; 220. Armor layer; 221. Flat aluminum alloy wire; 222. Aluminum alloy strip; 230. Outer sheath; 231. Halogenated low-smoke flame-retardant polyolefin protective layer; 232. Polypropylene tack tape; 233. Polyethylene protective layer;

[0026] 300. Fill layer. Detailed Implementation

[0027] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0028] This embodiment describes an energy-saving and environmentally friendly polypropylene insulated high-voltage cable, which relates to the field of medium-voltage cable technology. By modifying the structure of the cable core 100 and the protective sheath 200, the overall performance of the armor layer 220 of the conductor 110 can be improved.

[0029] Please see Figures 1 to 5 This embodiment presents an energy-saving and environmentally friendly polypropylene insulated high-voltage cable, comprising a cable core 100 and a protective sheath 200. The cable core 100 has lower resistance, higher tensile strength, and stronger abrasion resistance. The protective sheath 200 has higher tensile strength, compressive strength, and flame retardancy.

[0030] The cable core 100 includes a conductor 110 and a shielding structure 120 covering the conductor 110. The conductor 110 includes an inner layer of circular monofilaments 111 and an outer layer of corrugated monofilaments 112. A non-compacted stranded layer 113 is formed at the junction of the corrugated monofilaments 112 and the circular monofilaments 111. The circular monofilaments 111 have low contact resistance and good conductivity, providing good electrical conductivity for the conductor 110. The corrugated monofilaments 112 refer to corrugated monofilaments with a tile-shaped structure. The corrugated monofilaments 112 have a large surface area, which can increase the flexibility and bending resistance of the conductor.

[0031] The non-compacted stranded layer 113 is made of tile-shaped monofilaments 112 and round monofilaments 111 using a non-compacted stranding process. The non-compacted stranded layer 113 can effectively maintain the flexibility of the conductor, enabling the cable to withstand certain bending and stretching during use without damaging the wire.

[0032] The protective sleeve 200 is fitted onto the cable core 100 to protect the cable core 100. The protective sleeve 200 includes an isolation layer 210, an armor layer 220, and an outer sheath 230 nested from the inside out. The isolation layer 210 is used to isolate the cable core 100 from the armor layer 220 or the outer sheath 230, so that the cable core 100 has good electrical insulation and ensures the safe operation of the high-voltage cable in a high-voltage environment.

[0033] The armor layer 220 comprises flat aluminum alloy wires 221 and aluminum alloy strips 222. The armor layer 220 utilizes a combination of flat aluminum alloy wires 221 and aluminum alloy strips 222. The flat aluminum alloy wires 221 are wound in a forward spiral around the insulating layer 210, while the alloy strips are wrapped in a reverse spiral around the flat aluminum alloy wires 221. The aluminum alloy material itself possesses high strength and corrosion resistance, enhancing tensile and compressive strength while reducing overall weight, making it suitable for high-voltage and long-distance power transmission applications. The forward spiral winding of the flat aluminum alloy wires 221 and the reverse spiral wrapping of the aluminum alloy strips 222 effectively improve the mechanical strength of the armor layer 220, enhancing the cable's impact resistance and resistance to external damage.

[0034] The outer sheath 230 includes a halogenated low-smoke flame-retardant polyolefin sheath 231, which is fitted onto the armor layer 220. The halogenated low-smoke flame-retardant polyolefin material has good flame retardancy, low smoke properties and environmental friendliness.

[0035] In some embodiments, the circular monofilament 111 and the tile-shaped monofilament 112 are copper wires with an oxygen content of less than or equal to 0.0010%. Low-oxygen copper, also known as oxygen-free copper or high-purity copper, is a copper material with very low oxygen content. Since the presence of oxygen leads to a decrease in the electrical conductivity of copper, low-oxygen copper can effectively improve the conductivity of conductor 110, ensuring efficient power transmission. Compared to ordinary copper wire, low-oxygen copper conductor 110 can reduce energy loss and improve the transmission efficiency of the cable, making it particularly suitable for high-voltage power transmission and long-distance power transmission.

[0036] Low-oxygen copper exhibits excellent corrosion resistance due to its extremely low oxygen content, resulting in a significantly reduced corrosion rate. For cables exposed to harsh environments (such as high humidity, high salinity, or wind farms) for extended periods, low-oxygen copper can effectively extend the cable's service life.

[0037] In some embodiments, please refer to Figure 3 and Figure 4 The outer sheath 230 also includes polypropylene tack strips 232 and a polyethylene protective layer 233. Three polypropylene tack strips 232 are wound around the aluminum alloy strip 222, and the polyethylene protective layer 233 is disposed between the polypropylene tack strips 232 and the halogen low smoke flame retardant polyolefin sheath 231.

[0038] The outer sheath 230 includes a halogenated low-smoke flame-retardant polyolefin sheath 231, a polypropylene braided tape 232, and a polyethylene protective layer 233. These three components work together to play a crucial role in the cable's mechanical protection, electrical performance, and environmental friendliness.

[0039] Polypropylene braided tape 232 serves as a reinforcing layer. By wrapping it around aluminum alloy tape 222, it can distribute pressure when the cable is subjected to external pressure or bending, reducing the burden on the armor layer 220 and minimizing deformation or damage to the armor layer 220 due to excessive pressure. The reinforcing layer effectively prevents the cable from being damaged by external physical impacts or friction during transportation, installation, and operation.

[0040] The polyethylene protective layer 233 acts as an additional protective barrier, forming an extra layer of mechanical protection on the outside of the cable, effectively isolating it from external environmental factors (such as moisture, chemical corrosion, etc.) and preventing damage to the cable armor layer 220 and other internal structures.

[0041] As a further implementation, the insulating layer 210 is a polyethylene insulating layer 210. Polyethylene (PE), as a commonly used insulating material, has excellent electrical insulation properties. Its high dielectric strength enables it to effectively isolate the conductor 110 from the external environment, preventing electrical short circuits or leakage. The polyethylene insulating layer 210 provides the cable with advantages in many aspects, including excellent electrical insulation performance, resistance to environmental factors, mechanical protection, flexibility, and environmental friendliness.

[0042] In some embodiments, please refer to Figure 4 and Figure 5 The shielding structure 120 includes a shielding base sleeve 121 and an electrical shielding sleeve 122 nested from the inside out. The shielding base sleeve 121 covers the conductor 110. The electrical shielding sleeve 122 includes a copper alloy strip 122a, a semi-conductive strip 122b, a semi-conductive copper-plastic strip 122c, and a semi-conductive polyolefin inner sheath 122d arranged from the inside out.

[0043] The 122a copper alloy tape has excellent conductivity, effectively shielding the cable from electromagnetic interference (EMI) and preventing high-frequency electromagnetic waves from interfering with the power system and surrounding equipment. This is especially important for high-voltage cables or signal transmission cables, ensuring stable power signal transmission and preventing external electromagnetic waves from affecting the cable's operation.

[0044] The laminated structure of the semi-conductive tape 122b, the semi-conductive copper-plastic tape 122c, and the semi-conductive polyolefin inner sheath 122d achieves a more uniform electric field distribution by providing a gradual change in conductivity. This laminated structure effectively reduces the strong changes in the electric field within the cable, thereby further enhancing the cable's anti-interference capability, especially preventing high-voltage discharge or electrical accidents caused by concentrated electric fields during cable operation.

[0045] The copper alloy strip 122a and the semi-conductive copper-plastic strip 122c in the shielding structure 120 not only have good conductivity, but also improve the mechanical protection capability of the cable and protect the conductor 110 from external physical impact and wear.

[0046] In some embodiments, please continue reading Figure 4 and Figure 5 The shielding base 121 includes a polypropylene inner shielding layer 121a, a polypropylene insulating layer 121b, and a polypropylene outer shielding layer 121c arranged sequentially from the inside out.

[0047] Polypropylene insulation layer 121b, as the core insulation material of the cable, has excellent electrical insulation properties. Its high dielectric strength effectively prevents current leakage between cable conductors 110, avoids short circuits or electrical faults, improves the anti-interference capability of the power system, and ensures stable power transmission.

[0048] Polypropylene itself possesses high mechanical strength and abrasion resistance, effectively protecting cables from damage caused by external impacts, friction, or tension. Especially during long-term use, the polypropylene shielding layer maintains the overall integrity of the cable, preventing damage or performance degradation due to external physical factors.

[0049] As a further implementation method, thermoplastic polypropylene materials have good plasticity and flowability, and can be softened by heating before molding, extrusion, and other molding processes, facilitating large-scale production. Compared to cross-linked polypropylene (XLPE), non-cross-linked thermoplastic polypropylene materials are easier to control during processing, and the processing technology is simpler and less expensive.

[0050] Thermoplastic materials have good reheat-forming properties, making them easier to process in cable manufacturing, especially when rapid production and customized designs are required, providing greater flexibility.

[0051] Thermoplastic polypropylene is an excellent electrical insulation material, effectively preventing electrical leakage between the cable conductor 110 and the external environment. Polypropylene has high dielectric strength and low dielectric loss, enabling it to maintain stable insulation performance in high-voltage applications.

[0052] One of the biggest advantages of thermoplastic polypropylene is its complete recyclability. At the end of the cable's life cycle, the thermoplastic polypropylene layer can be remelted and reused without special processing, meeting the requirements of sustainable development and environmental protection.

[0053] In contrast, thermosetting polypropylene materials undergo irreversible chemical changes after cross-linking, making them unrecyclable and more difficult to process, thus increasing the burden of waste disposal.

[0054] In some embodiments, a filler layer 300 is disposed between the isolation layer 210 and the semi-conductive polyolefin inner sheath 122d. The filler layer 300 provides a buffer between the isolation layer 210 and the semi-conductive polyolefin inner sheath 122d, which helps to prevent the concentration of electric field, thereby reducing the local electric field strength that may be generated in the cable, reducing the occurrence of electrical discharge or arc, and thus enhancing the electrical stability of the cable.

[0055] The inclusion of filler layer 300 can improve the voltage withstand capability of the cable, especially in high-voltage operating environments, which helps to improve the cable's voltage withstand capability and reduce electrical faults caused by uneven electric field.

[0056] The filler layer 300 effectively isolates the semiconductive layer and the insulating layer 210 from contact, preventing electrical problems caused by contact or friction between the two layers. Its effective filling function reduces voids or micro-cracks within the cable, thereby improving the overall insulation of the cable and reducing the risk of insulation damage.

[0057] The filler layer 300 is generally made of materials with good insulation properties, such as inorganic materials or other high-insulation polymers, so that the cable can maintain good electrical isolation during long-term operation.

[0058] In practical applications, filler layer 300 is typically used to improve the structure, performance, and reliability of cables. The main function of filler layer 300 is to enhance the overall functionality of the cable, ensuring that it maintains good electrical performance, mechanical strength, and environmental adaptability during use. Filler layer 300 can be inorganic fillers (such as talc, silicates), polyethylene (PE), halogen-free low-smoke flame-retardant materials, or aluminum powder fillers.

[0059] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the present utility model.

Claims

1. An energy-saving and environmentally friendly polypropylene insulated high-voltage cable, characterized in that, include: The cable core includes a conductor and a shielding structure covering the conductor. The conductor includes a circular monofilament in the inner layer and a corrugated monofilament in the outer layer. A non-compacted stranded layer is formed at the junction of the corrugated monofilament and the circular monofilament. A protective sheath is fitted onto the cable core. The protective sheath includes an isolation layer, an armor layer, and an outer sheath nested from the inside out. The armor layer includes flat aluminum alloy wires and aluminum alloy strips. The flat aluminum alloy wires are wound in a clockwise spiral around the isolation layer, and the aluminum alloy strips are wrapped in a counterclockwise spiral around the flat aluminum alloy wires. The outer sheath includes a halogenated low-smoke flame-retardant polyolefin sheath, which is fitted onto the armor layer.

2. The energy-saving and environmentally friendly polypropylene insulated high-voltage cable according to claim 1, characterized in that, The circular and tile-shaped monofilaments are copper wires with an oxygen content of less than or equal to 0.0010%.

3. The energy-saving and environmentally friendly polypropylene insulated high-voltage cable according to claim 1, characterized in that, The outer sheath also includes polypropylene tack strips and a polyethylene protective layer. Three polypropylene tack strips are wound around the aluminum alloy strip, and the polyethylene protective layer is disposed between the polypropylene tack strips and the halogenated low-smoke flame-retardant polyolefin sheath.

4. The energy-saving and environmentally friendly polypropylene insulated high-voltage cable according to claim 3, characterized in that, The isolation layer is a polyethylene isolation layer.

5. The energy-saving and environmentally friendly polypropylene insulated high-voltage cable according to claim 1, characterized in that, The shielding structure includes a shielding base sleeve and an electrical shielding sleeve nested from the inside out. The shielding base sleeve covers the conductor. The electrical shielding sleeve includes a copper alloy strip, a semi-conductive strip, a semi-conductive copper-plastic strip, and a semi-conductive polyolefin inner sheath arranged from the inside out.

6. The energy-saving and environmentally friendly polypropylene insulated high-voltage cable according to claim 5, characterized in that, The shielding base includes, from the inside out, a polypropylene inner shielding layer, a polypropylene insulation layer, and a polypropylene outer shielding layer.

7. The energy-saving and environmentally friendly polypropylene insulated high-voltage cable according to claim 6, characterized in that, The polypropylene inner shielding layer, polypropylene insulation layer, and polypropylene outer shielding layer are non-crosslinked thermoplastic polypropylene layers.

8. The energy-saving and environmentally friendly polypropylene insulated high-voltage cable according to claim 5, characterized in that, A filler layer is provided between the isolation layer and the semi-conductive polyolefin inner sheath.

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