Corrosion-resistant insulated overhead cable

Abstract

The invention discloses a corrosion-resistant insulating aerial cable which sequentially comprises a conductor layer, an insulating layer, a shielding layer, a corrosion-resistant layer and an outer sheath from inside to outside. The conductor layer is an aluminum alloy stranded wire of which the surface is coated with an anti-oxidation coating; the insulating layer is made of crosslinked polyethylene doped with 3-5% of nano silicon dioxide; the corrosion-resistant layer is a fluoroplastic or polyurethane coating; and the outer sheath is polyvinyl chloride added with an antioxidant and an ultraviolet light absorber. The fluoroplastic coating is formed through electrostatic spraying, and the surface of the copper wire shielding layer is subjected to phosphating pretreatment; the doped nano material enhances the mechanical strength and ultraviolet resistance of the insulating layer; the spiral groove design accelerates drainage and reduces accumulated water corrosion.

Description

Technical Field

[0001] The invention relates to the technical field of power transmission equipment, in particular to a corrosion-resistant insulated overhead cable. Background Art

[0002] Overhead cables are exposed to outdoor environments for a long time and are easily corroded by rain, salt spray, industrial pollutants, etc., which can lead to aging of the insulation layer, corrosion of the conductor, and the risk of leakage or breakage.

[0003] In the prior art, cables mostly use a single insulation layer or a common metal sheath, which has insufficient corrosion resistance and mechanical strength.

[0004] Therefore, we propose a corrosion-resistant insulated overhead cable to solve the above problems. Summary of the Invention

[0005] The present invention aims to solve the problems in the prior art and proposes the following technical solutions:

[0006] A corrosion-resistant insulated overhead cable comprises, from the inside out, a conductor layer, an insulating layer, a shielding layer, a corrosion-resistant layer and an outer sheath; the conductor layer is an aluminum alloy stranded wire coated with an anti-oxidation coating; the insulating layer is cross-linked polyethylene doped with 3-5% nano-silicon dioxide; the corrosion-resistant layer is a fluoroplastic or polyurethane coating; and the outer sheath is polyvinyl chloride to which an antioxidant and an ultraviolet absorber are added.

[0007] As a preferred embodiment of the above technical solution, the aluminum alloy stranded wire is an Al-Mg-Si alloy with a conductivity of ≥61% IACS.

[0008] As a preferred embodiment of the above technical solution, the particle size of the nano-silicon dioxide is 20-50 nm.

[0009] As a preferred embodiment of the above technical solution, a spiral drainage groove is provided on the surface of the outer sheath.

[0010] As a preferred embodiment of the above technical solution, the shielding layer is an electromagnetic shielding mesh woven from copper wires, the diameter of the copper wires is 0.1-0.3 mm, and the braiding density is 60-90%.

[0011] As a preferred embodiment of the above technical solution, the shielding layer is an electromagnetic shielding mesh woven from copper wires, the diameter of the copper wires is 0.1-0.3 mm, and the braiding density is 60-90%.

[0012] As a preferred embodiment of the above technical solution, the fluoroplastic coating is formed by electrostatic spraying, and the surface of the copper wire shielding layer is pre-treated by phosphating.

[0013] As a preferred embodiment of the above technical solution, the insulating layer is cross-linked polyethylene (XLPE) doped with 3-5% nano-silica, wherein the particle size of the nano-silica is 20-50 nm and the surface is modified by a silane coupling agent.

[0014] The beneficial effects of the present invention are:

[0015] (1) The fluoroplastic coating is formed by electrostatic spraying, and the surface of the copper wire shielding layer is pre-treated by phosphating;

[0016] (2) Doping with nanomaterials to enhance the mechanical strength and UV resistance of the insulation layer;

[0017] (3) The spiral groove design accelerates drainage and reduces water accumulation and corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the cross-sectional structure of the cable of the present invention is shown.

[0019] Legend:

[0020] 1. Corrosion-resistant layer; 2. Shielding layer; 3. Insulation layer; 4. Conductor layer; 5. Outer sheath. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0022] Example 1:

[0023] like Figure 1 As shown, in an embodiment of the present invention: a corrosion-resistant insulated overhead cable, the conductor layer 4 adopts an Al-Mg-Si aluminum alloy stranded wire with a diameter of 2.5 mm; the insulating layer 3 is XLPE mixed with 4% nano-silicon dioxide, extruded; the shielding layer 2 is woven by copper wire with a diameter of 0.15 mm; the corrosion-resistant layer 1 is sprayed with 1 mm polyurethane; 2.5% antioxidant (such as type 1010) and 1.5% UV-531 ultraviolet absorber are added to the outer sheath 5PVC, and a spiral groove is formed after molding.

[0024] Example 2:

[0025] Shielding layer 2 utilizes 0.2mm diameter annealed copper wire with an 80% braid density (55° braid angle). Tested shielding effectiveness at 1GHz is 38dB. Combined with insulation layer 3 (XLPE + 4% nano-SiO2), the cable exhibits a resistance change of ≤5% after 5000 hours of operation in a salt spray environment.

[0026] Example 3 (fluoroplastic coating):

[0027] The surface of the shielding layer 2 is treated with zinc phosphating (phosphating solution concentration 20 g / L, treatment time 5 min);

[0028] Use PTFE powder electrostatic spraying (voltage 60kV, thickness 1.0mm), and sintering and curing at 380℃;

[0029] Test results: According to GB / T 1771 salt spray test for 1000h, the coating has no blistering or peeling; the copper wire resistivity change is ≤2%.

[0030] Example 4 (polyurethane coating):

[0031] After cleaning, the copper wire shield layer 2 was dipped in TPU solution (solid content 40%) and cured at 120°C for 45 minutes to a thickness of 1.2 mm.

[0032] When the outer sheath 5 is co-extruded, 1% KH-550 coupling agent is added, and the interface bonding strength reaches 4.2MPa (GB / T2791 standard);

[0033] Test results: After 100,000 bending cycles (radius 8D), the coating has no cracks and the shielding effectiveness decreases by less than 2dB.

[0034] Example 5 (Nano-silica doped XLPE):

[0035] Nano-silica with a particle size of 30 nm (surface treated with KH-550) and XLPE particles were pre-mixed at a ratio of 4 wt % and extruded in a twin-screw extruder (170 ° C, shear rate 600 s -1 ) blending and granulation;

[0036] Chemical cross-linking (adding 0.8% DCP) is used and extruded outside the conductor layer 4, with a thickness of 2.0 mm;

[0037] Test results: After 1000 hours of UV aging, the tensile strength retention rate is 92%; the power frequency breakdown field strength is ≥35kV / mm (undoped XLPE is 25kV / mm).

[0038] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.

Claims

1. A corrosion-resistant insulated overhead cable, characterized in that: The invention comprises, from the inside to the outside, a conductor layer (4), an insulating layer (3), a shielding layer (2), a corrosion-resistant layer (1) and an outer sheath (5); the conductor layer (4) is an aluminum alloy stranded wire coated with an anti-oxidation coating; the insulating layer (3) is a cross-linked polyethylene doped with 3-5% nano-silicon dioxide; the corrosion-resistant layer (1) is a fluoroplastic or polyurethane coating; and the outer sheath (5) is polyvinyl chloride to which an antioxidant and an ultraviolet absorber are added.

2. The corrosion-resistant insulated overhead cable according to claim 1, characterized in that: The aluminum alloy stranded wire is an Al-Mg-Si alloy, and has an electrical conductivity of ≥61% IACS.

3. The corrosion-resistant insulated overhead cable according to claim 1, characterized in that: The particle size of the nano-silicon dioxide is 20-50 nm.

4. The corrosion-resistant insulated overhead cable according to claim 1, characterized in that: The surface of the outer sheath (5) is provided with a spiral drainage groove.

5. The corrosion-resistant insulated overhead cable according to claim 1, characterized in that: The shielding layer (2) is an electromagnetic shielding mesh woven from copper wires, the diameter of the copper wires is 0.1-0.3 mm, and the braiding density is 60-90%.

6. The corrosion-resistant insulated overhead cable according to claim 5, characterized in that: The shielding layer (2) is an electromagnetic shielding mesh woven from copper wires, the diameter of the copper wires is 0.1-0.3 mm, and the braiding density is 60-90%.

7. The corrosion-resistant insulated overhead cable according to claim 1, characterized in that: The fluoroplastic coating is formed by electrostatic spraying, and the surface of the copper wire shielding layer (2) is pre-treated by phosphating.

8. The cable according to claim 1, wherein The insulating layer (3) is cross-linked polyethylene (XLPE) doped with 3-5% nano-silicon dioxide, wherein the particle size of the nano-silicon dioxide is 20-50 nm and the surface is modified by a silane coupling agent.

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