Preparation method of aluminum-copper composite terminal for aluminum alloy high-voltage cable

Abstract

The invention discloses an aluminum alloy high-voltage cable aluminum copper composite terminal. The aluminum alloy high-voltage cable aluminum copper composite terminal comprises a copper alloy substrate and connecting grooves formed in the two ends of the copper alloy substrate; the connecting grooves adopt a U-shaped groove-shaped cross section and are symmetrically distributed along the axis of the copper alloy substrate; the length of the connecting grooves is 1 / 5-1 / 2 of that of the copper alloy substrate; the inner surfaces of the connecting grooves are both distribute with aluminium alloy lining layers; and the thickness of the aluminium alloy lining layers is 1 / 4-3 / 4 of that of the connecting groove side wall; and the preparation method comprises four steps of copper alloy substrate prefabrication, connecting groove pre-processing, aluminum lining layer positioning, connecting groove diameter expansion and connecting groove fine processing. By virtue of the aluminum alloy high-voltage cable aluminum copper composite terminal and the preparation method thereof, the connecting structural strength, the impact resistance performance, the corrosion resistance performance and thehigh temperature resistance performance between the terminal and the cable can be improved effectively, so that the mechanical structural strength of the terminal is highly improved; and in addition,the overload capacity of the terminal is improved effectively, and current distribution uniformity is improved, thereby highly improving reliability and operational stability of the power cable connection operation.

Description

technical field [0001] The invention relates to a method for preparing an aluminum-copper composite terminal of an aluminum alloy high-voltage cable, belonging to the technical field of cables. Background technique [0002] At present, in the construction of power lines, it is often necessary to connect the alloy aluminum stranded wires through terminal blocks. At present, when performing such operations, on the one hand, the alloy aluminum stranded wires that need to be connected are directly twisted and braided by hand. On the other hand, it is connected through terminal blocks. Due to the high labor intensity and low work efficiency of manual twisted and braided connection, the use of multi-wire connection is very large, but in the actual application of construction and power cables It is found that in order to improve the stability of the conductivity between the wires, the used terminals are all made of aluminum alloy material similar to the wire material. Although it c...

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Problems solved by technology

[0002] At present, in the construction of power lines, it is often necessary to connect the alloy aluminum stranded wires through terminal blocks. At present, when performing such operations, on the one hand, the alloy aluminum stranded wires that need to be connected are directly twisted and braided by hand. On the other hand, it is connected through terminal blocks. Due to the high labor intensity and low work efficiency of manual twisted and braided connection, the use of multi-wire connection is very large, but in the actual application of construction and power cables It is found that in order to improve the stability of the conductivity between the wires, the used terminals are all made of aluminum alloy material similar to the wire material. Although it can meet the needs of use to a certain extent, the structural strength of the aluminum alloy material is relatively high. Poor, high temperature resistance, relatively poor corrosion resistance, relatively insufficient overload resistance, coupled with the large difference in the structure of the terminal, resulting in a large difference in the current distribution in the terminal, which leads to the current use of aluminum alloy wiring The conductivity and reliability of the terminal are relatively poor, which seriously reflects the reliability and stability of the power line connection. Therefore, in view of the current situation, it is urgent to develop a new aluminum alloy terminal mechanism and processing method. to meet the needs of actual use

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