Teach you how to connect aluminum alloy cables

Because the expansion coefficient and material properties of the aluminum alloy conductor and the copper conductor are different, it is not suitable to directly connect the copper conductor and the aluminum alloy conductor. Usually, the following methods are used to achieve the purpose of connection.

(1) Alloy cable + aluminum terminal (when the aluminum terminal is connected to the tinned copper bar, tighten the screw according to the torque value provided by the national standard, and add a disc washer, so that the copper and aluminum metal can keep the copper and aluminum effective when they expand with heat and contract with cold. connection), this connection scheme has poor reliability.

(2) Aluminum alloy cable + aluminum alloy copper transition terminal with the same performance as the connected aluminum alloy cable (the aluminum alloy part of the terminal is connected to the alloy cable, and the copper part is connected to the terminal copper bar). This connection is the real The most correct, reasonable, reliable and perfect connection scheme.

(3) Alloy cable + copper-aluminum transition terminal (the aluminum part of the terminal is connected to the alloy, and the copper part is connected to the copper bar) or alloy cable + micro-alloy copper transition terminal (because the alloy only considers the conductivity or other properties of the terminal, it is not connected to the connected The chemical composition, electrical properties, mechanical properties, compressive creep properties, etc. of aluminum alloy cables do not match). The above connection method is a transitional solution when it is impossible to obtain an aluminum alloy copper transition terminal that matches the performance of the connected aluminum alloy cable, but these solutions are due to the existence of aluminum or the so-called alloy that does not match the performance of the connected aluminum alloy cable. , even if you do 1000 thermal cycle experiments according to IEC61238-2003 or GB9327-2008, and simulate 30 years of application (after all, it is a laboratory simulation, it is an experiment after terminal standard crimping in the laboratory, and the test time is short, in fact, it cannot It really reflects the characteristics of aluminum material such as creep tendency), etc., and the construction is strictly in accordance with the specifications, and the safety of cable connection and use cannot be guaranteed, because of the existence of the connection terminal aluminum or the so-called alloy material that does not match the performance of the cable, all aluminum machinery The problems of poor performance, creep resistance, etc. still exist, so this connection scheme has poor reliability.