An aluminum alloy high-voltage cable aluminum-copper composite terminal

Abstract

The invention discloses an aluminum-copper composite wiring terminal for an aluminum alloy high voltage cable, which comprises a copper alloy base body and wiring slots located at two ends of the copper alloy base body, wherein the connecting slots are of a U-shaped slot structure in cross section and symmetrically distributed about an axis of the copper alloy base body, the length of the connecting slots is 1 / 5-1 / 2 of the length of the copper alloy base body, the inner surface of each wiring slot is uniformly provided with an aluminum alloy lining, and the thickness of the aluminum alloy lining is 1 / 4-3 / 4 of the thickness of the side wall of the wiring slot. The preparation method comprises four steps such as copper alloy base body prefabrication, wiring slot preprocessing, aluminum lining positioning and wiring slot diameter expansion and wiring slot fine machining. On the one hand, the connecting structure strength, impact resistance, corrosion resistance and high temperature resistance between the wiring terminal and the cable can be effectively improved, and the mechanical structural strength of the wiring terminal is greatly improved; and on the other hand, the overload capacity of the wiring terminal can be effectively improved, the uniformity of current distribution is improved, so that the reliability and operation stability of power cable connection are greatly improved.

Description

technical field [0001] The invention relates to an aluminum-copper composite terminal for aluminum alloy high-voltage cables, 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 can meet the needs of use...

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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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