Composite core half-hard aluminum conductor and manufacturing method thereof

Abstract

The invention discloses a composite core half-hard aluminum conductor and a manufacturing method thereof. The manufacturing method comprises the following steps: I, processing so as to manufacture an aluminum rod; II, drawing the aluminum rod into hard aluminum wires; III, performing high-temperature thermal treatment on the hard aluminum wires so as to obtain half-hard aluminum wires; IV, concentrically twisting a plurality of half-hard aluminum wires and carbon fiber composite cores, thereby obtaining the finished carbon fiber composite core half-hard aluminum conductor. As the composite cores and the intermediate state aluminum wires are combined, and a specific process is provided, the produced carbon fiber composite core half-hard aluminum conductor has the characteristics of large pulling strength, large draw-weight ratio, good conductivity, relatively large surface hardness, low probability of scratching in laying, small sagging and the like, and the line security can be greatly improved.

Description

technical field [0001] The invention relates to a composite core semi-rigid aluminum stranded wire and a manufacturing method thereof. Background technique [0002] Because of its light weight, high tensile strength, high temperature resistance, high specific modulus, and small linear expansion coefficient, fiber-reinforced resin-based composite wires have attracted widespread attention and gradually been popularized and applied in power transmission. [0003] At present, one kind of fiber-reinforced resin-based composite wire is mainly an annealed aluminum wire with a fiber-reinforced resin-based composite core. The wire structure is a soft aluminum conductor outside the composite core. Because the resistivity of the soft aluminum conductor is lower than that of the ordinary hard aluminum conductor, the conductivity can reach 62.5-63.5% IACS, and its conductivity is increased by 1% compared with the ordinary hard aluminum wire. ~2%. According to statistics, if the conduct...

AI Technical Summary

Problems solved by technology

However, one of the main disadvantages of the soft aluminum conductor is that its texture is relatively soft, and the surface hardness is relatively low. During the construction process, it is very easy to cause scratches on the surface of the wire, resulting in an uneven surface of the wire, which is prone to corona, thereby forming corona loss and causing electric energy. At the same time, the strength of soft aluminum is relatively low, and the strength of soft aluminum is generally 50-90MPa. During the erection and operation of the wire, the aluminum part exerts a small force, resulting in a relatively low breaking force of the entire wire

[0004] In addition, in order to improve the soft aluminum conductor's relatively soft texture, relatively low surface hardness, and low strength, we have developed a relatively high-strength duralumin wire to match the composite core. The combination of the hard aluminum wire and the composite core greatly improves the friction resistance of the wire. However, due to the small elongation of the duralumin wire, generally 1.5 to 2.0%, when the duralumin wire and the composite core are combined with force, the composite core will often cause the composite core to fail. The aluminum wire breaks under full force, so that the high tensile properties of the composite core cannot be exerted. Therefore, in order to improve the elongation of the duralumin wire and take advantage of the strength of the composite core, we have developed a composite core high elongation duralumin At the same time, in order not to reduce the strength of the hard aluminum wire and increase the elongation of the hard aluminum wire, it is necessary to add alloy elements that increase the elongation in the aluminum, such as iron, magnesium, etc. The addition of these elements will inevitably cause conductor resistance. Therefore, the conductivity of high-elongation duralumin is generally around (60-61)% IACS, so the line loss is relatively large