Heat-resistant anti-corrosion energy-saving overhead conductor

Abstract

The utility model discloses a heat-resistant anti-corrosion energy-saving overhead conductor, which comprises a plurality of aluminum-clad steel cores, an anti-corrosion layer is arranged on the outer wall of each aluminum-clad steel core, a buffer layer is wrapped on the outer wall of each anti-corrosion layer, the aluminum-clad steel cores and the anti-corrosion layers are wrapped by the buffer layers, a conductive layer is arranged on the outer wall of each buffer layer, and a protective layer is fixed on the outer wall of each conductive layer. The conductive layer comprises an inner trapezoidal conductor layer and an outer trapezoidal conductor layer, the inner trapezoidal conductor layer is stranded on the outer wall of the buffer layer and is stranded on the outer wall of the inner trapezoidal conductor layer, the stranding directions of the inner trapezoidal conductor layer and the outer trapezoidal conductor layer are opposite, the aluminum-clad steel core is formed by stranding LB40 type aluminum-clad steel wires, and the outer wall of the aluminum-clad steel core is plated with an aluminum layer; the aluminum-clad steel core is adopted to replace a galvanized steel core to serve as the bearing wire core, the weight of the wire can be reduced, the overall conductivity of the wire can be improved, the wrapped semi-conductive water-blocking shielding tape buffer layer can play a buffering role, the wire is prevented from being suddenly broken due to external force, an electric field can be homogenized, and line loss can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of overhead conductors, in particular to a heat-resistant and corrosion-resistant energy-saving overhead conductor. Background Art

[0002] As the main carrier of electric energy, overhead transmission lines occupy a very important position in transmission lines. With the development of the country's ultra-high voltage, long-distance and large-capacity transmission technology, higher requirements are put forward for the heat resistance, corrosion resistance, conductivity and mechanical properties of overhead transmission lines. At present, the widely used overhead transmission lines are mainly steel-core aluminum stranded wires, which have certain defects, such as:

[0003] 1. The aluminum monofilaments that make up the overhead conductors have residual stress after being deformed by mechanical processing (stretching, twisting), which makes them brittle and easy to break.

[0004] 2. Since there are gaps between each round aluminum wire, the small contact area makes the contact resistance larger, thereby increasing the conductor resistance of the entire wire.

[0005] 3. The heat-resistant temperature of the conductor determines its ability to transmit current. Overhead conductors will generate heat during operation, which will increase line losses and reduce transmission capacity when the outside temperature is high in summer. Utility Model Content

[0006] In view of the above problems, the utility model provides a heat-resistant, corrosion-resistant and energy-saving overhead conductor; it has a simple production and processing technology, not only has excellent heat and corrosion resistance, but also has good conductivity, mechanical properties and creep resistance. At the same time, a protective layer is arranged on the outer surface of the conductor, which can effectively reduce the impact of the external environment on the conductor and improve the service life of the conductor.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a heat-resistant, corrosion-resistant and energy-saving overhead conductor, comprising a plurality of aluminum-clad steel cores, the outer wall of the aluminum-clad steel core is provided with an anti-corrosion layer, the outer wall of the anti-corrosion layer is overlapped and wrapped with a buffer layer, the buffer layer wraps the aluminum-clad steel core and the anti-corrosion layer and forms a cylindrical shape, the outer wall of the buffer layer is provided with a conductive layer, the outer wall of the conductive layer is fixed with a protective layer, the conductive layer comprises an inner trapezoidal conductor layer and an outer trapezoidal conductor layer, the inner trapezoidal conductor layer is twisted on the outer wall of the buffer layer, the inner trapezoidal conductor layer is twisted on the outer wall of the inner trapezoidal conductor layer, and the twisting directions of the inner trapezoidal conductor layer and the outer trapezoidal conductor layer are opposite.

[0008] Preferably, the aluminum-clad steel core is formed by twisting LB40 aluminum-clad steel wires and the outer wall is plated with an aluminum layer.

[0009] Preferably, the anti-corrosion layer uses 40A280 anti-corrosion grease and the acid value or alkalinity value is not greater than 2.

[0010] Preferably, the buffer layer is formed by wrapping a semi-conductive shielding tape, and the thickness of the semi-conductive shielding tape is in the range of 1.5 to 2.0 mm.

[0011] Preferably, the conductive layer is formed by twisting LHA3X type high conductivity heat-resistant aluminum alloy wires.

[0012] Preferably, the protective layer is formed by extruding polytetrafluoroethylene, and the extrusion thickness of the polytetrafluoroethylene is in the range of 2.0 to 2.5 mm.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0014] 1. Using aluminum-clad steel core instead of galvanized steel core as the load-bearing wire core can reduce the weight of the wire itself and improve the overall conductivity of the wire; the wrapped semi-conductive water-shielding tape buffer layer can not only play a buffering role to prevent the wire from suddenly breaking due to external force, but also can homogenize the electric field and reduce line loss. At the same time, it also isolates the aluminum-clad steel and aluminum alloy wires to avoid electrochemical corrosion caused by contact between different metals under the action of current.

[0015] 2. The conductive layer is made of high-conductivity aluminum alloy wire, which improves the performance of the wire from two aspects: the material itself and reducing the contact resistance between the wires. It can also use the high-strength mechanical properties of the aluminum alloy itself to reduce the occurrence of accidental wire breakage; the protective layer uses polytetrafluoroethylene as the protective layer, which not only takes into account the requirements of heat resistance and corrosion resistance, but also has excellent electrical insulation properties, mechanical properties, and non-flammability, which can effectively protect the wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a partial cross-sectional schematic diagram of the utility model;

[0018] Figure 3 It is a front view schematic diagram of the utility model;

[0019] Figure 4 It is an explosion diagram of the utility model.

[0020] Explanations in the figure: 1. Aluminum-clad steel core; 2. Anti-corrosion layer; 3. Buffer layer; 4. Conductive layer; 5. Protective layer; 401. Inner trapezoidal conductor layer; 402. Outer trapezoidal conductor layer. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0022] See also Figure 1 and Figure 2 A heat-resistant and corrosion-resistant energy-saving overhead conductor comprises a plurality of aluminum-clad steel cores 1, wherein the aluminum-clad steel core 1 is twisted with LB40 aluminum-clad steel wires, and the coating requirements are as follows: the minimum aluminum layer thickness is 25% of the nominal diameter of the aluminum-clad steel wire, and the purity of the aluminum used for the coating is not less than 99.5%; the density is 4.64g / cm3, which is much lower than the density of the galvanized steel core 7.8g / cm3; the electrical performance requirements are as follows: the DC resistivity of a single wire at 20°C is ≤43.10nΩ·m; the mechanical performance requirements are as follows: the tensile strength of a single wire before twisting is ≥680MPa, the elongation at break is ≥1%, and the stress at 1% elongation is ≥500%; the toughness requirements are as follows: at a length of 100 times the nominal diameter, the aluminum-clad steel wire can withstand no less than 20 twists without breaking, and the aluminum layer should not be detached from the steel core after breaking;

[0023] Furthermore, using an aluminum-clad steel core instead of a galvanized steel core as the load-bearing wire core can reduce the weight of the wire itself and improve the overall conductivity of the wire.

[0024] Please refer to 2. Figure 3 and Figure 4 The outer wall of the aluminum clad steel core 1 is provided with an anti-corrosion layer 2, which adopts 40A280 anti-corrosion grease, with an acid value or alkalinity value of no more than 2, and can be applied to an ambient temperature of -40°C to 280°C. It maintains adhesion at a low temperature of -40°C and does not melt or drip at a high temperature of 280°C, effectively ensuring the anti-corrosion performance of the load-bearing core. The outer wall of the anti-corrosion layer 2 is overlapped and wrapped with a buffer layer 3, which wraps the aluminum clad steel core 1 and the anti-corrosion layer 2 and forms a cylindrical shape. The buffer layer 3 adopts a semi-conductive shielding tape, which is made of a semi-conductive polyester fiber non-woven fabric, a semi-conductive adhesive, and a semi-conductive Conductive fluffy cotton and high-speed expansion water-absorbing resin are the main materials; thickness 1.5-2.0mm, unit weight 260-300g / m2, tensile strength ≥40N / cm2, expansion speed ≥8mm / 1min, expansion height ≥12mm / 3min, short-term stability 230℃, long-term stability 90℃, surface resistance ≤1500Ω, volume resistance ≤1×106Ω·cm, moisture content ≤9%, the buffer layer 3 can not only play a buffering role, but also prevent the wire from being suddenly broken by external force, and can also homogenize the electric field and reduce line loss;

[0025] Furthermore, the buffer layer 3 also isolates the aluminum-clad steel from the aluminum alloy profile wire, thereby preventing electrochemical corrosion caused by contact between different metals under the action of electric current.

[0026] See also Figure 3 and Figure 4The outer wall of the buffer layer 3 is provided with a conductive layer 4, and the conductive layer 4 includes an inner trapezoidal conductor layer 401 and an outer trapezoidal conductor layer 402. The inner trapezoidal conductor layer 401 is twisted on the outer wall of the buffer layer 3, and the inner trapezoidal conductor layer 401 is twisted on the outer wall of the inner trapezoidal conductor layer 401. The twisting directions of the inner trapezoidal conductor layer 401 and the outer trapezoidal conductor layer 402 are opposite. The conductive layer 4 is twisted with LHA3X type high conductivity heat-resistant aluminum alloy wire. The high conductivity heat-resistant aluminum alloy rod is made by reasonably controlling the addition sequence and addition amount of trace alloying elements such as B, Zr and Er. The required wire is drawn on a large aluminum alloy wire drawing machine through a special mold, and is tightly and evenly twisted according to a certain structure and direction. Aluminum alloy single wire performance requirements: DC resistivity at 20°C ≤ 29.472nΩ·m, density 2.703g / cm3, tensile strength ≥ 295MPa, elongation ≥ 3.5%, linear expansion coefficient 23×10-41 / °C; the twisting directions of the inner trapezoidal conductor layer 401 and the outer trapezoidal conductor layer 402 are set oppositely, so that the inner trapezoidal conductor layer 401 and the outer trapezoidal conductor layer 402 are in close contact, ensuring the fixation of the inner trapezoidal conductor layer 401 and the outer trapezoidal conductor layer 402;

[0027] Furthermore, the conductive layer 4 is made of high-conductivity aluminum alloy wires, which improves the performance of the wires from two aspects: the material itself and reducing the contact resistance between the wires. It can also use the high-strength mechanical properties of the aluminum alloy itself to reduce the occurrence of accidental wire breakage.

[0028] See also Figure 4 The outer wall of the conductive layer 4 is fixed with a protective layer 5, and the protective layer 5 is formed by extruding 2.0-2.5mm thick polytetrafluoroethylene through an extruder. Polytetrafluoroethylene has excellent heat and cold resistance and can be used for a long time at -180℃~260℃. At the same time, it is almost insoluble in all solvents. Polytetrafluoroethylene also has good electrical insulation properties, mechanical properties and certain flame retardant properties, which protects the internal part of the cable. The polytetrafluoroethylene has a density of 2.2g / cm3, a melting point of 321℃, a resistivity of 1×1014-1019Ω·cm, a dielectric constant of 2.0F / m, a thermal conductivity of 0.167-0.300W / m·k, and a heat capacity of 1.50J / g℃. Furthermore, the conductive layer 4 is made of polytetrafluoroethylene, which has excellent electrical insulation properties, mechanical properties, and non-flammability while taking into account the requirements of heat resistance and corrosion resistance, and can effectively protect the wire.

[0029] During production of this utility model:

[0030] Firstly, the aluminum-clad steel core 1 is formed by twisting a round wire composed of a round steel core wrapped with a uniform and continuous aluminum layer by a twisting machine, and then a layer of anti-corrosion grease is coated on the outer wall of the aluminum-clad steel core 1 as the anti-corrosion layer 2, and a semiconductor resistance water tape is wrapped around the outer wall of the aluminum-clad steel core 1 and the anti-corrosion layer 2 is wrapped therein as a buffer layer 3; then, a conductive layer 4 is formed by twisting a high-conductivity heat-resistant aluminum alloy wire outside the buffer layer 3 according to certain rules; finally, a layer of polytetrafluoroethylene is extruded on the outer wall of the conductive layer 4 by an extruder as a protective layer 5, and then cooled. The cable does not require special equipment for production and processing, and the product structure and production process are relatively simple, which can better meet the design requirements.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heat-resistant and corrosion-resistant energy-saving overhead conductor, characterized in that: The invention comprises a plurality of aluminum-clad steel cores (1), wherein the outer wall of the aluminum-clad steel core (1) is provided with an anti-corrosion layer (2), the outer wall of the anti-corrosion layer (2) is overlapped and wrapped with a buffer layer (3), the buffer layer (3) wraps the aluminum-clad steel core (1) and the anti-corrosion layer (2) therein and forms a cylindrical shape, the outer wall of the buffer layer (3) is provided with a conductive layer (4), the outer wall of the conductive layer (4) is fixed with a protective layer (5), the conductive layer (4) comprises an inner trapezoidal conductor layer (401) and an outer trapezoidal conductor layer (402), the inner trapezoidal conductor layer (401) is twisted on the outer wall of the buffer layer (3), the inner trapezoidal conductor layer (401) is twisted on the outer wall of the inner trapezoidal conductor layer (401), and the inner trapezoidal conductor layer (401) and the outer trapezoidal conductor layer (402) are twisted in opposite directions.

2. The heat-resistant and corrosion-resistant energy-saving overhead conductor according to claim 1, characterized in that: The aluminum-clad steel core (1) is made of LB40 aluminum-clad steel wires twisted together and the outer wall is plated with an aluminum layer.

3. The heat-resistant and corrosion-resistant energy-saving overhead conductor according to claim 1, characterized in that: The anti-corrosion layer (2) uses 40A280 anti-corrosion grease with an acid value or alkalinity value not greater than 2.

4. The heat-resistant and corrosion-resistant energy-saving overhead conductor according to claim 1, characterized in that: The buffer layer (3) is formed by wrapping a semi-conductive shielding tape, and the thickness of the semi-conductive shielding tape is in the range of 1.5 to 2.0 mm.

5. The heat-resistant and corrosion-resistant energy-saving overhead conductor according to claim 1, characterized in that: The conductive layer (4) is formed by twisting LHA3X type high conductivity heat-resistant aluminum alloy wires.

6. The heat-resistant and corrosion-resistant energy-saving overhead conductor according to claim 1, characterized in that: The protective layer (5) is formed by extrusion of polytetrafluoroethylene, and the extrusion thickness of the polytetrafluoroethylene is in the range of 2.0 to 2.5 mm.

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