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CN-122025246-A - High-strength low-loss polyvinyl chloride power cable

CN122025246ACN 122025246 ACN122025246 ACN 122025246ACN-122025246-A

Abstract

The application relates to the technical field of power cable manufacturing, and particularly discloses a high-strength low-loss polyvinyl chloride power cable. The high-strength low-loss polyvinyl chloride power cable comprises a conductor layer, wherein a reinforcing layer is arranged outside the conductor layer, an insulating inner layer is arranged outside the reinforcing layer, an insulating middle layer is arranged outside the insulating inner layer, an insulating outer layer is arranged outside the insulating middle layer, and the insulating inner layer, the insulating middle layer and the insulating outer layer jointly form the insulating layer, wherein the reinforcing layer is formed by spirally winding stainless steel wires, the insulating outer layer is composed of polyvinyl chloride and nano silicon dioxide, the insulating middle layer is composed of polyvinyl chloride and mica powder, and the insulating inner layer is composed of polyvinyl chloride and a plasticizer. The power cable can be used in occasions with requirements on mechanical strength, flexibility and long-term electrical stability, and has the comprehensive advantages of high mechanical strength, excellent fatigue resistance, low insulation loss, uniform electric field distribution, good long-term operation reliability and the like.

Inventors

  • HAN WENCHAO

Assignees

  • 江苏元建线缆有限公司

Dates

Publication Date
20260512
Application Date
20260318

Claims (10)

  1. 1. The high-strength low-loss polyvinyl chloride power cable is characterized by comprising a conductor layer (1), wherein a reinforcing layer (2) is arranged outside the conductor layer (1), an insulating inner layer (3) is arranged outside the reinforcing layer (2), an insulating middle layer (4) is arranged outside the insulating inner layer (3), an insulating outer layer (5) is arranged outside the insulating middle layer (4), the insulating inner layer (3), the insulating middle layer (4) and the insulating outer layer (5) jointly form an insulating layer, the reinforcing layer (2) is formed by spirally winding stainless steel wires, the insulating outer layer (5) is composed of, by weight, 90% -95% of polyvinyl chloride and 5% -10% of nano silicon dioxide, the insulating middle layer (4) is composed of, by weight, 88% -92% of polyvinyl chloride and 8% -12% of mica powder, and the insulating inner layer (3) is composed of, by weight, 70% -85% of polyvinyl chloride, 10% -20% of plasticizer and 5% -15% of titanium dioxide.
  2. 2. A high strength low loss polyvinyl chloride power cable according to claim 1 wherein said plasticizer is dioctyl phthalate.
  3. 3. A high strength low loss polyvinyl chloride power cable according to claim 1, wherein the diameter of the stainless steel wire in the reinforcing layer (2) is 0.05-0.15mm, the spiral winding angle is 45 °, and the number of winding turns per meter is 1800-2200 turns.
  4. 4. A high strength low loss polyvinyl chloride power cable according to claim 1 wherein the thickness of the outer insulating layer (5) is 40% of the total thickness of the insulating layer, the thickness of the middle insulating layer (4) is 30% of the total thickness of the insulating layer, and the thickness of the inner insulating layer (3) is 30% of the total thickness of the insulating layer.
  5. 5. The high-strength low-loss polyvinyl chloride power cable according to claim 1, wherein the nano silicon dioxide is gas-phase nano silicon dioxide, and the specific surface area is 150-250 m2/g.
  6. 6. The high strength low loss polyvinyl chloride power cable according to claim 1, wherein the mica powder is muscovite powder having a particle size of less than 20 μm.
  7. 7. The high-strength low-loss polyvinyl chloride power cable according to claim 1, wherein the nano silicon dioxide is subjected to surface treatment by a silane coupling agent, the silane coupling agent is gamma-aminopropyl triethoxysilane, and the addition amount is 1% -3% of the weight of the nano silicon dioxide.
  8. 8. A high strength low loss polyvinyl chloride power cable according to claim 1 wherein said insulation layer and said reinforcement layer (2) are simultaneously heat fused by five stage temperature controlled extrusion.
  9. 9. The high-strength low-loss polyvinyl chloride power cable according to claim 8, wherein the temperature control range of the five-stage temperature control extrusion is that the first stage is 150 ℃ plus or minus 5 ℃, the second stage is 165 ℃ plus or minus 5 ℃, the third stage is 175 ℃ plus or minus 5 ℃, the fourth stage is 170 ℃ plus or minus 5 ℃, and the fifth stage is 160 ℃ plus or minus 5 ℃, and the screw rotating speed is 18-22 r/min.
  10. 10. The high-strength low-loss polyvinyl chloride power cable according to claim 1, wherein the surface of the stainless steel wire of the reinforcing layer (2) is coated with an insulating adhesive coating, and the insulating adhesive coating comprises, by weight, 60% -70% of epoxy resin and 30% -40% of polyamide curing agent.

Description

High-strength low-loss polyvinyl chloride power cable Technical Field The application relates to the technical field of power cable manufacturing, in particular to a high-strength low-loss polyvinyl chloride power cable. Background The power cable manufacturing is characterized in that metal materials such as copper and aluminum are used as conductors, polymer materials such as polyvinyl chloride, crosslinked polyethylene and polyethylene are used as insulating layers and sheath layers, and a series of processes such as conductor drawing and twisting, insulating extrusion, shielding wrapping/extrusion, armor processing, sheath extrusion, cabling, finished product inspection and the like are used for producing cable products for transmitting and distributing electric energy. Related power cables generally have mechanical strength and insulation performance improved by adding a metal armor layer or increasing insulation thickness, but a single metal armor layer can reduce flexibility and increase weight of the cable, and simply increasing insulation thickness can introduce interface defects and deteriorate electric field distribution, so that the cable is damaged by a sheath and broken down by insulation in high-stress complex laying environments such as dynamic bending, frequent vibration and the like, and further the application range and the service life of the cable are limited. Disclosure of Invention In order to solve the problems that the cable is damaged by a sheath and is broken in insulation part under the high-stress complex laying environment such as dynamic bending, frequent vibration and the like due to the fact that the mechanical strength and the insulation performance are improved by adding a metal armor layer or increasing the insulation thickness of the related power cable, and further the application range and the service life of the cable are limited, the application provides a high-strength low-loss polyvinyl chloride power cable. The application provides a high-strength low-loss polyvinyl chloride power cable, which adopts the following technical scheme: A high-strength low-loss polyvinyl chloride power cable comprises a conductor layer, wherein a reinforcing layer is arranged outside the conductor layer, an insulating inner layer is arranged outside the reinforcing layer, an insulating middle layer is arranged outside the insulating inner layer, an insulating outer layer is arranged outside the insulating middle layer, and the insulating inner layer, the insulating middle layer and the insulating outer layer jointly form the insulating layer, wherein the reinforcing layer is formed by spirally winding stainless steel wires, the insulating outer layer comprises, by weight, 90% -95% of polyvinyl chloride, 5% -10% of nano silicon dioxide, the insulating middle layer comprises, by weight, 88% -92% of polyvinyl chloride, 8% -12% of mica powder, and the insulating inner layer comprises, by weight, 70% -85% of polyvinyl chloride, 10% -20% of a plasticizer and 5% -15% of titanium dioxide. By adopting the technical scheme, the reinforcing layer adopts the spiral winding structure of the stainless steel wire, so that the mechanical strength and the tensile resistance of the cable are improved, the cable is suitable for a high-stress laying environment, meanwhile, the high elastic modulus and the fatigue resistance of the stainless steel wire can assist the cable to resist external mechanical impact and prevent the conductor layer from deforming, and the three-layer insulating material is differentially combined based on the dielectric property and the mechanical property of the cable, so that the effects of improving the overall mechanical strength, enhancing the fatigue resistance and optimizing the electric field distribution of the cable are obtained, and the cable can be suitable for a high-stress complex laying environment. Preferably, the plasticizer is dioctyl phthalate. By adopting the technical scheme, dioctyl phthalate is selected as the plasticizer, has high compatibility with polyvinyl chloride molecular chains, and can be inserted between polymer chains so as to weaken intermolecular acting force, thereby reducing the glass transition temperature of the insulating inner layer and improving the flexibility and the processability of the insulating inner layer in a low-temperature environment. Preferably, the diameter of the stainless steel wire in the reinforcing layer is 0.05-0.15mm, the spiral winding angle is 45 degrees, and the winding turns per meter is 1800-2200 turns. By adopting the technical scheme, the diameter range in the parameter combination ensures the balance of the monofilament strength and the overall flexibility, the winding angle of forty-five degrees can lead the stress born by the cable to be evenly distributed when the cable is bent, the stress concentration is avoided, the winding density of 1800-2200 turns per meter ensures the coverage rate and the supporting