CN-224203879-U - Copper core overhead cable

CN224203879UCN 224203879 UCN224203879 UCN 224203879UCN-224203879-U

Abstract

The utility model discloses a copper core overhead cable which comprises a soft copper core conductor, a conductor wrapping layer, a conductor shielding layer, an insulating layer and an outer sheath layer, wherein the conductor wrapping layer, the conductor shielding layer, the insulating layer and the outer sheath layer are sequentially wrapped outside the soft copper core conductor from inside to outside, the soft copper core conductor comprises a plurality of strands which are twisted in a multi-strand manner, the strands comprise a plurality of soft copper single wires which are twisted in a multi-strand manner, and water blocking paste is filled in gaps among the strands. The copper core overhead cable has the advantages of good flexibility, small resistance and the like, and solves the problems of poor bending performance, large conductor loss, high construction cost, high construction difficulty and the like in the use process of the conventional overhead insulated cable.

Inventors

CHENG JUNNAN
Zhao Haotan
JIN ZHICHENG
XU DAN
WU MENGYAO
LU XINGWU
WANG HAIQIANG

Assignees

特变电工新疆电缆有限公司
特变电工股份有限公司

Dates

Publication Date: 20260505
Application Date: 20250403

Claims (7)

1. A copper core overhead cable is characterized by comprising a soft copper core conductor, a conductor wrapping layer, a conductor shielding layer, an insulating layer and an outer sheath layer, The conductor wrapping layer, the conductor shielding layer, the insulating layer and the outer sheath layer are sequentially wrapped outside the soft copper core conductor from inside to outside; The soft copper core conductor comprises a plurality of strands which are twisted by a plurality of strands, the strands comprise a plurality of soft copper single wires which are twisted by a plurality of soft copper single wire bundles, and water blocking paste is filled in gaps among the strands; The soft copper single wire is twisted in the same direction as the twisted strands, the conductor wrapping layer is a water-blocking tape, the conductor shielding layer is formed by extrusion of a semiconductive shielding material, the insulating layer is formed by extrusion of crosslinked polyethylene and forms a 'dampproof-shielding-insulating' triple-protection composite layer structure with the water-blocking tape and the conductor shielding layer, and the outer sheath layer is formed by cross braiding of bulletproof wires and nylon wires.
2. The copper core overhead cable of claim 1, wherein the single soft copper wire is a soft copper conductor with a diameter of 0.15-0.5 mm.
3. The copper core overhead cable of claim 1, wherein the soft copper single wire has a bundle lay ratio of 15 to 25 times and the strand has a composite lay ratio of 10 to 12 times.
4. The copper core overhead cable according to claim 1, wherein the conductor wrapping layer is a water blocking tape, the structure adopts single-layer overlapping wrapping, the wrapping direction is opposite to the twisting direction of the soft copper core conductor, and the overlap ratio is 30% -50%.
5. The copper core overhead cable of any one of claims 1-4, wherein the water blocking tape is a metal composite tape material.
6. The copper core overhead cable of claim 5, wherein the outer jacket layer is woven in a three-dimensional forward weave wherein the ballistic filaments are helically wound along the Z-axis and the nylon filaments are woven orthogonally in the XY-plane.
7. The copper core overhead cable of claim 6, wherein the braid intersection angle of the outer jacket layer is 60 ° to 90 ° and the braid density is 20 to 50 per 10cm 2 .

Description

Copper core overhead cable Technical Field The utility model belongs to the technical field of cable production, and particularly relates to a copper core overhead cable. Background With the rapid development of the power transmission and distribution industry, the power supply quantity demand is continuously increased, and the market prospect is wide. At present, a copper core overhead insulated wire is generally made of hard copper, and has the problems of high resistance, poor bending performance, high construction cost, high construction difficulty and the like, so that the copper core overhead insulated wire is difficult to adapt to various scenes with high stability requirements, such as a wet area, a city dense area, connection of distribution network terminal equipment and the like. In addition, conventional polyvinyl chloride (PVC) or Polyethylene (PE) jacketed cables have low mechanical strength (tensile strength <20 MPa), poor abrasion resistance (abrasion loss > 200Mm 3), is easy to be damaged by external force to cause the failure of insulating property, and meanwhile, the conductor is not provided with a special waterproof layer, and moisture permeation causes copper core oxidation (contact resistance is increased > 15%) And insulation breakdown (breakdown field strength drop > 30%). Although the improvement scheme of the metal armor or the single material reinforced sheath exists, the cable has a great weight (20% -20% increase 40 Percent) and insufficient strength under dynamic stress, and severely restricts the construction and installation of power transmission and distribution lines under special environments. Disclosure of utility model Aiming at the defects existing in the prior art, the utility model provides the copper core overhead cable which has the properties of good flexibility, small resistance and the like, and solves the problems of poor bending property, high conductor loss, high construction cost, high construction difficulty and the like existing in the use process of the conventional overhead insulated cable. The technical scheme for solving the technical problems is as follows: The utility model provides a copper core overhead cable which comprises a soft copper core conductor, a conductor wrapping layer, a conductor shielding layer, an insulating layer and an outer sheath layer, wherein the conductor wrapping layer, the conductor shielding layer, the insulating layer and the outer sheath layer are sequentially wrapped outside the soft copper core conductor from inside to outside, the soft copper core conductor comprises a plurality of strands which are twisted in a multi-strand manner, the strands comprise a plurality of soft copper single wires which are twisted in a multi-strand manner, and water blocking paste is filled in gaps among the strands. Optionally, the soft copper single wire is a soft copper conductor with a diameter of 0.15-0.5 mm of a tiny monofilament. Optionally, the bundle pitch diameter ratio of the soft copper single wire is 15-25 times, and the compound pitch diameter ratio of the strand is 10-12 times. Optionally, the stranding direction of the soft copper single wire is the same as the stranding direction of the strand, for example, both are left or right. Optionally, the conductor wrapping layer is a water-blocking tape, the structure of the conductor wrapping layer adopts single-layer overlapping wrapping, the wrapping direction is opposite to the twisting direction of the soft copper core conductor, and the overlapping rate is 30% -50%. Optionally, the water-blocking tape is made of a metal composite tape material. Optionally, the conductor shielding layer is formed by extruding a semiconductive shielding material. Optionally, the insulating layer is formed by extruding and packaging crosslinked polyethylene, and forms a composite layer structure with the water blocking belt and the conductor shielding layer. Optionally, the outer sheath layer is formed by interweaving bulletproof yarns and nylon yarns, the braiding mode is a three-dimensional forward braiding method, the bulletproof yarns are spirally wound along a Z axis, and the nylon yarns are orthogonally braided on an XY plane. Optionally, the braiding crossing angle of the outer sheath layer is 60-90 degrees, and the braiding density is 20-50 pieces/10 cm < 2 >. The copper core overhead cable has the following beneficial effects: (1) The soft copper core conductor is adopted, compared with the hard copper core conductor, the soft copper core conductor is formed by twisting strands formed by twisting a plurality of fine copper wire bundles, the contact area is obviously larger than that of a single-strand hard copper core conductor, the resistance is small, and the alternating current is more concentrated on the surface of the conductor for transmission according to the skin effect principle, so that the effective current carrying area of the soft copper core conductor is larger, the curr