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CN-122025251-A - Special power cable suitable for high-altitude severe environment and preparation method thereof

CN122025251ACN 122025251 ACN122025251 ACN 122025251ACN-122025251-A

Abstract

The invention discloses a special power cable suitable for a high-altitude severe environment and a preparation method thereof, and relates to the technical field of power cables. The special power cable comprises a conductor assembly, an insulating shielding assembly, a separation sleeve layer, an armor layer and an outer sheath layer which are sequentially arranged from inside to outside, wherein the separation sleeve layer is made of a polyolefin matrix containing an anti-ultraviolet modifier, the anti-ultraviolet modifier comprises nano inorganic anti-ultraviolet particles and sheet-shaped fillers, the sheet-shaped fillers are in a disordered dispersion state in the matrix, the outer sheath layer is made of a high-hardness polymer matrix, and physical reinforcing fibers and/or chemical repellent components are compounded in the high-hardness polymer matrix. Based on the technical scheme disclosed by the invention, the cable at least simultaneously meets the requirements of low temperature resistance, temperature impact resistance, artificial climate aging resistance and high-grade biological protection through the cooperative innovation of the materials and the structure, and has the advantages of excellent comprehensive environmental adaptability and long service life.

Inventors

  • YUAN HUA
  • CUI YONG
  • ZHAO SHILIN
  • ZHENG YU
  • CHEN MENG
  • WANG HAOYU
  • WANG LI
  • WU QING
  • CHEN MENGDI
  • Zheng shida

Assignees

  • 航天瑞奇电缆有限公司
  • 航天电工集团有限公司

Dates

Publication Date
20260512
Application Date
20260319

Claims (10)

  1. 1. The special power cable suitable for the high-altitude severe environment is characterized by comprising a conductor assembly, an insulating shielding assembly, a spacer sleeve layer, an armor layer and an outer sheath layer which are sequentially arranged from inside to outside, wherein the spacer sleeve layer is made of a polyolefin matrix containing an anti-ultraviolet modifier, the anti-ultraviolet modifier comprises nano inorganic anti-ultraviolet particles and sheet-shaped fillers, and the sheet-shaped fillers are in a disordered dispersion state in the matrix to form a barrier network; The outer sheath layer is made of a high-hardness polymer matrix, wherein physical reinforcing fibers and/or chemical repellent components are compounded in the high-hardness polymer matrix, the physical reinforcing fibers are distributed in the outer sheath layer in an axial direction of the cable, and the chemical repellent components are fixed in the high-hardness polymer matrix in a chemical bonding or immobilization mode so as to prevent migration or volatilization of the chemical repellent components in a low-temperature environment.
  2. 2. The special power cable according to claim 1, wherein the conductor assembly comprises a tin-plated copper conductor, and the insulating shield assembly comprises a conductor shield layer, a low-temperature-resistant crosslinked polyethylene insulating layer, an insulating shield layer and a metal shield layer which are sequentially coated on the outer side of the tin-plated copper conductor.
  3. 3. The special power cable according to claim 1, wherein the nano inorganic anti-ultraviolet particles are nano titanium dioxide, nano zinc oxide or a composite of the nano titanium dioxide and the nano zinc oxide, and the platy filler is at least one of mica powder, talcum powder and glass flake.
  4. 4. The special power cable according to claim 1, wherein the high-hardness polymer matrix is one or a mixture of thermoplastic polyurethane, polyamide and modified polyolefin, and the surface hardness of the outer sheath layer is greater than or equal to Shore D70.
  5. 5. The special power cable according to claim 1 or 4, characterized in that the physical reinforcing fiber is an inorganic fiber or a high-performance organic fiber, and the fiber length thereof is 50-300 μm.
  6. 6. The special power cable according to claim 1, wherein the chemical repellent component is a cycloheximide derivative, a capsaicin derivative or a carbamate derivative, and is introduced onto the molecular chain of the high-hardness polymer matrix by graft copolymerization or a reactive extrusion process.
  7. 7. The specialty power cable of claim 1 wherein the armor is a galvanized steel tape gap wrap or a high strength aluminum alloy tape interlocking armor.
  8. 8. The special power cable according to claim 1, characterized in that between the insulation jacket layer and the armour layer and/or between the armour layer and the outer jacket layer, there is further provided an adhesive sealing layer filling the interlayer gap to block longitudinal penetration of moisture and salt mist.
  9. 9. A method of manufacturing a special power cable as claimed in any one of claims 1-8, comprising the steps of: S1, preparing a conductor assembly, and extruding and wrapping the conductor assembly to form a separation sleeve layer containing an anti-ultraviolet modifier and a sheet filler; S2, arranging an armor layer outside the isolation sleeve layer; s3, preparing an outer sheath mixture containing a high-hardness polymer base material, physical reinforcing fibers and chemical repellent components; And S4, extruding the outer sheath mixture on the armor layer, and controlling the physical reinforcing fibers to be distributed along the axial direction of the cable.
  10. 10. The method of manufacturing a specialty power cable according to claim 9, further comprising the step of coating or wrapping an adhesive sealing layer on the surface of said armor layer after step S2 and before step S4.

Description

Special power cable suitable for high-altitude severe environment and preparation method thereof Technical Field The invention relates to the technical field of power cables, in particular to a special power cable suitable for a high-altitude severe environment and a preparation method thereof. Background The environment in the plateau area (with the altitude of more than 3000 meters) is extremely complex, extremely severe requirements are set for the performance of the power cable, and the method can be specifically characterized in that (1) the low temperature and the temperature impact are that the annual low temperature of the relevant area can reach below-40 ℃, the day-night temperature difference is extremely large, the conventional cable material is hardened and cracked, the insulating layer and the sheath layer are peeled off due to the unmatched thermal expansion coefficients, (2) the strong ultraviolet radiation and the weather aging are that the ultraviolet intensity of the relevant area is far higher than that of plain, the aging and pulverization of the high polymer material are accelerated, (3) the salt fog corrosion is that the salt lake or the saline-alkali soil exists in part of the area, the salt content in the air is high, the metal armor layer and the sheath are highly corrosive, and (4) the biological hazard is that the cable is possibly bitten by the activities of rats and ants, and serious accidents such as short circuit or broken lines are caused. Currently, conventional power cables of the related art either have only a single improved characteristic (e.g., only low temperature resistance or only protection against termites), and cannot be stably operated for a long period of time under such a comprehensive severe environment. Meanwhile, conventional methods for preventing rodents and ants (such as adding a stimulating substance such as capsaicin) are prone to migration failure at low temperatures and may accelerate material aging. Accordingly, there is a need to develop an integrated cable solution that systematically addresses the multiple environmental challenges of the highland. Disclosure of Invention The invention aims to overcome the technical defects, and provides a special power cable suitable for a high-altitude severe environment and a preparation method thereof, which solve the technical problems that the comprehensive protection performance of the cable is insufficient and the cable is difficult to stably operate for a long time in the severe environment in the prior art. In order to achieve the technical purpose, the invention adopts the following technical scheme: The invention provides a special power cable suitable for a high-altitude severe environment, which comprises a conductor assembly, an insulating shielding assembly, a separation sleeve layer, an armor layer and an outer sheath layer which are sequentially arranged from inside to outside, wherein the separation sleeve layer is made of a polyolefin matrix containing an anti-ultraviolet modifier, the anti-ultraviolet modifier contains nano inorganic anti-ultraviolet particles and lamellar fillers, and the lamellar fillers are in a disordered dispersion state in the matrix to form a separation network; The outer sheath layer is made of a high-hardness polymer matrix, wherein physical reinforcing fibers and/or chemical repellent components are compounded in the high-hardness polymer matrix, the physical reinforcing fibers are distributed in the outer sheath layer in an axial direction of the cable, and the chemical repellent components are fixed in the high-hardness polymer matrix in a chemical bonding or immobilization mode so as to prevent migration or volatilization of the chemical repellent components in a low-temperature environment. In some embodiments, the conductor assembly comprises a tin-plated copper conductor, and the insulating shielding assembly comprises a conductor shielding layer, a low-temperature-resistant crosslinked polyethylene insulating layer, an insulating shielding layer and a metal shielding layer which are sequentially coated on the outer side of the tin-plated copper conductor. In some embodiments, the nano inorganic anti-ultraviolet particles adopt nano titanium dioxide, nano zinc oxide or a compound of the nano titanium dioxide and the nano zinc oxide, and the platy filler is at least one of mica powder, talcum powder and glass flake. In some embodiments, the high hardness polymer matrix is a mixture of one or more of thermoplastic polyurethane, polyamide, and modified polyolefin, and the surface hardness of the outer jacket layer is greater than or equal to Shore D70. In some embodiments, the physical reinforcing fibers are inorganic fibers or high performance organic fibers and have a fiber length of 50-300 μm. In some embodiments, the chemical repellent component is a cycloheximide derivative, a capsaicin derivative, or a carbamate derivative, and is incorporated onto the molecu