CN219497355U

CN219497355U - 35kV low-carbon environment-friendly PP insulated cable

Info

Publication number: CN219497355U
Application number: CN202320433953.1U
Authority: CN
Inventors: 刘北喜; 侯少绵; 林伟江
Original assignee: Guangzhou Zhujiang Cable Co ltd
Current assignee: Guangzhou Zhujiang Cable Co ltd
Priority date: 2023-03-08
Filing date: 2023-03-08
Publication date: 2023-08-08
Anticipated expiration: 2033-03-08

Abstract

The utility model discloses a 35kV low-carbon environment-friendly PP insulated cable, which comprises a cable core, wherein the cable core consists of three cable cores and a filling material; the wire core comprises a conductor, wherein the outer side of the conductor is sequentially coated with an inner shielding layer, an insulating layer, an outer shielding layer and a metal shielding layer from inside to outside; the outer side of the cable core is sequentially provided with a belting layer, an inner sheath, an armor layer and an outer sheath from inside to outside; the utility model adopts the modified polypropylene material with low carbon and environmental protection to replace the traditional crosslinked polyethylene insulation, thereby better realizing the environmental protection, economy and reliability of the cable, avoiding producing crosslinked byproducts in the production process, protecting the production environment, reducing the production cost and recycling the insulation material after the cable is used; hidden danger of influence on insulation strength such as water branch growth can be effectively slowed down and electrical property safe and reliable is favorable to promoting load intensive region power transmission ability and power supply reliability.

Description

35kV low-carbon environment-friendly PP insulated cable

Technical Field

The utility model relates to the technical field of cables, in particular to a 35kV low-carbon environment-friendly PP insulated cable.

Background

At present, most of common medium-high voltage cables are made of crosslinked polyethylene insulating materials, and the crosslinked polyethylene insulating materials have good heat resistance, insulating performance, mechanical properties and chemical resistance, but because the crosslinked polyethylene insulating materials are thermosetting materials, a large amount of energy sources are needed in the crosslinking process to heat the vulcanizing pipes, and meanwhile, harmful gases are generated, so that the environment is polluted. In addition, the crosslinked polyethylene insulation generates dendritic discharge channels therein under the action of an electric field and water, which are called "water branches". The water tree branches can continue to grow along with the development of time, finally, the cable insulation layer is broken down, and insulation materials in aged and faulty cables are difficult to recover and decompose, so that the cable insulation layer becomes a new environmental pollutant.

Disclosure of Invention

The utility model provides a 35kV low-carbon environment-friendly PP insulated cable, which aims to solve the problems in the background technology. In order to achieve the above purpose, the present utility model provides the following technical solutions: the 35kV low-carbon environment-friendly PP insulated cable comprises a cable core, wherein the cable core consists of three cable cores and a filler, and the filler is arranged at the gaps of the three cable cores; the wire core comprises a conductor, wherein the outer side of the conductor is sequentially coated with an inner shielding layer, an insulating layer, an outer shielding layer and a metal shielding layer from inside to outside; the outside of cable core is equipped with band layer, inner sheath, armor and oversheath from inside to outside in proper order.

Preferably, the wrapping belt layer is formed by wrapping nylon belts, mica belts, ceramic silicone rubber composite belts or glass fiber belts, and the wrapping coverage rate is not less than 30%.

Preferably, the insulating layer is a modified polypropylene insulating layer.

Preferably, the thickness of the modified polypropylene insulating layer ranges from 1.5 to 2mm.

Preferably, the inner shielding layer and the outer shielding layer are both semiconductive polypropylene shielding layers.

Preferably, the metal shielding layer is formed by braiding tinned copper wires, and the coverage rate of the metal shielding layer on the outer shielding layer is not lower than 90%.

Preferably, the inner sheath and the outer sheath are low-smoke halogen-free flame retardant polyolefin sheath layers, the thickness range of the inner sheath is 2-2.5 mm, and the thickness range of the outer sheath is 4.5-5.5 mm.

Preferably, the filler is an inorganic filler.

Preferably, the armor layer is formed by winding steel wires, steel strips or brass strips.

Preferably, the inner side of the metal shielding layer is provided with a puncture-proof layer.

Compared with the prior art, the utility model has the beneficial effects that: the utility model adopts the modified polypropylene material with low carbon and environmental protection to replace the traditional crosslinked polyethylene insulation, thereby better realizing the environmental protection, economy and reliability of the cable, avoiding producing crosslinked byproducts in the production process, protecting the production environment, reducing the production cost and recycling the insulation material after the cable is used; hidden danger of influence on insulation strength such as water branch growth can be effectively slowed down and electrical property safe and reliable is favorable to promoting load intensive region power transmission ability and power supply reliability.

Drawings

FIG. 1 is a block diagram of a 35kV low-carbon environment-friendly PP insulated cable according to an embodiment of the utility model;

in fig. 1, the correspondence between the names of the components and the reference numerals is:

1-filler, 2-conductor, 3-inner shielding layer, 4-insulating layer, 5-outer shielding layer, 6-metal shielding layer, 7-belting layer, 8-inner sheath, 9-armor layer and 10-outer sheath.

Detailed Description

Embodiments of the present utility model are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the utility model but are not intended to limit the scope of the utility model.

In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," and the like are used as an orientation or positional relationship based on that shown in the drawings, merely to facilitate description of the utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1, the utility model provides a 35kV low-carbon environment-friendly PP insulated cable, which comprises a cable core, wherein the cable core consists of three wire cores and a filler 1, and the filler 1 is arranged at the gap of the three wire cores; the wire core comprises a conductor 2, wherein the outer side of the conductor 2 is sequentially coated with an inner shielding layer 3, an insulating layer 4, an outer shielding layer 5 and a metal shielding layer 6 from inside to outside; the outside of the cable core is sequentially provided with a belting layer 7, an inner sheath 8, an armor layer 9 and an outer sheath 10 from inside to outside.

In the embodiment of the utility model, gaps among three wire cores are filled by the filler 1, a cable core is formed, and the periphery of the cable core is protected by the wrapping band layer 7, the inner sheath 8, the armor layer 9 and the outer sheath 10. The inner sheath 8 and the outer sheath 10 in this embodiment are made of low smoke halogen-free flame retardant materials, and the armor layer 9 is provided with a cable core with a metal material armor protection layer, so that the tensile strength and the compressive strength of the cable core are enhanced, and the service life is prolonged. In the inner wire core, the conductor 2 is coated with the shielding layer, the insulating layer 4, the outer shielding layer 5 and the metal shielding layer 6, wherein the insulating layer 4 is made of a low-carbon environment-friendly PP insulating material, compared with the traditional crosslinked polyethylene insulating material, the thickness of the insulating layer 4 made of the low-carbon environment-friendly PP insulating material is reduced by 15-20%, the outer diameter can be reduced by 5-10%, the cable can stably run in a higher temperature environment for a long time, and the current carrying capacity of the cable can be improved by 10-15% compared with that of the crosslinked polyethylene cable with the same specification. In addition, the insulating layer 4 made of the low-carbon environment-friendly PP insulating material can effectively slow down hidden dangers affecting the insulating strength, such as water tree growth, and the electrical property is safe and reliable.

Preferably, the wrapping belt layer 7 is formed by wrapping nylon belts, mica belts, ceramic silicone rubber composite belts or glass fiber belts, and the wrapping coverage rate is not less than 30%. In this embodiment, the wrapping band layer 7 may be wrapped with various material bands according to actual needs.

Preferably, the insulating layer 4 is a modified polypropylene insulating layer. In this embodiment, the modified polypropylene insulating material is used as the insulating layer, and the inner shielding layer 3 and the outer shielding layer 5 which are matched with the insulating material are used, so that the highest temperature of the conductor allowed in normal operation of the cable can be improved, and the current-carrying capacity can be improved. The modified polypropylene insulating layer does not need to be crosslinked in the production process, so that a vulcanizing tube is not needed to be used for high-temperature heating, energy sources can be saved, occurrence of crosslinking byproducts can be avoided, and the environment is protected. After the cable is used, the insulating material can be recycled, so that environmental pollution is avoided.

Preferably, the inner shielding layer 3 and the outer shielding layer 5 are both semiconductive polypropylene shielding layers.

Preferably, the metal shielding layer 6 is formed by braiding tin-plated copper wires, and the coverage rate of the metal shielding layer 6 to the outer shielding layer 5 is not lower than 90%.

Preferably, the inner sheath 8 and the outer sheath 10 are both low smoke halogen-free flame retardant polyolefin sheath layers, the thickness of the inner sheath 8 ranges from 2mm to 2.5mm, and the thickness of the outer sheath 10 ranges from 4.5 mm to 5.5mm.

Preferably, the filler 1 is an inorganic filler 1.

Preferably, the armor layer 9 is formed by winding steel wires, steel strips or brass strips.

Preferably, the inner side of the metal shielding layer 6 is provided with a puncture-proof layer. By providing a puncture-preventing layer, various sharp objects are prevented from penetrating, especially the thread ends or the metal wires inside the metal shielding layer 6 are prevented from penetrating, and then the stability of the internal structure is affected.

The embodiments of the utility model have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the utility model in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, and to enable others of ordinary skill in the art to understand the utility model for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. The 35kV low-carbon environment-friendly PP insulated cable is characterized by comprising a cable core, wherein the cable core consists of three wire cores and a filler (1), and the filler is arranged at a gap of the three wire cores; the wire core comprises a conductor (2), wherein the outer side of the conductor is sequentially coated with an inner shielding layer (3), an insulating layer (4), an outer shielding layer (5) and a metal shielding layer (6) from inside to outside; the outer side of the cable core is sequentially provided with a belting layer (7), an inner sheath (8), an armor layer (9) and an outer sheath (10) from inside to outside; and an anti-puncture layer is arranged on the inner side of the metal shielding layer.

2. The 35kV low-carbon environment-friendly PP insulated cable according to claim 1, wherein the wrapping tape layer is formed by wrapping a nylon tape, a mica tape, a ceramic silicone rubber composite tape or a glass fiber tape, and the wrapping overlap ratio is not less than 30%.

3. The 35kV low carbon, environmental protection PP insulated cable of claim 1, wherein the insulation layer is a modified polypropylene insulation layer.

4. A 35kV low carbon environment-friendly PP insulation cable according to claim 3, wherein the thickness of the modified polypropylene insulation layer ranges from 1.5 to 2mm.

5. The 35kV low-carbon, environment-friendly PP insulated cable of claim 1, wherein the inner shielding layer and the outer shielding layer are both semiconductive polypropylene shielding layers.

6. The 35kV low-carbon environment-friendly PP insulated cable according to claim 5, wherein the metal shielding layer is formed by braiding tin-plated copper wires, and the coverage rate of the metal shielding layer to the outer shielding layer is not less than 90%.

7. The 35kV low-carbon environment-friendly PP insulated cable according to claim 1, wherein the inner sheath and the outer sheath are both low smoke halogen-free flame retardant polyolefin sheath layers, the thickness of the inner sheath ranges from 2 to 2.5mm, and the thickness of the outer sheath ranges from 4.5 to 5.5mm.

8. The 35kV low-carbon, environment-friendly PP insulated cable according to claim 1, wherein the filler is an inorganic filler.

9. The 35kV low-carbon, environment-friendly PP insulated cable according to claim 1, wherein the armor layer is formed by winding a steel wire, a steel strip, or a brass strip.