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[China Aluminum Network] Five reasons why soft aluminum alloy cables must use soft aluminium alloy special copper and aluminum terminals:
For the first reason: copper-aluminum transition terminals due to the presence of aluminum in the terminal A, so the problem of defects and deficiencies of aluminum still exist, especially the creep properties of compression, this terminal is used to connect aluminum alloy cable, aluminum alloy cable The advantages and the value of the equipment are reflected. It is better to use aluminum cables directly because aluminum cables are more economical. The use of aluminum alloy soft copper and aluminum terminals can give full play to the advantages and value of aluminum alloy cables.
The second reason: The copper-aluminum transition terminal was originally used for the transition connection between the aluminum cable and the copper mechanical device. The resistance value of the copper aluminum terminal mounting dimensions does not match the size resistance value of the terminal device, which not only increases the electrical conductivity between the copper mechanical devices. Performance and compression creep performance, but also can increase the electrical performance and transfer copper multi-channel transfer, will also leave connection security risks. Using aluminum alloy dedicated terminals can avoid similar problems.
The third reason: due to the mismatch of the copper-aluminum transition connecting terminals and the electrical terminals, increasing the contradictions between the conduction performance and the compression creep resistance of the copper switching equipment and the cost conflicts often arise, and it is difficult to avoid the problems that cannot be solved due to such problems. The connection risks caused by brutal construction have occurred. The use of aluminum alloy dedicated copper and aluminum terminals can avoid similar problems.
The fourth reason: Copper-aluminum transition terminals were originally used to connect aluminum cables. The inner diameter of these terminals does not match the outer diameter of the cable conductors. Special crimping tools must be used, making it difficult to standardize the construction and leaving hidden safety hazards. Using aluminum alloy dedicated terminals can avoid similar problems.
The fifth largest reason: At present, the purity of aluminum in the various brands of copper-aluminum transition terminals used in the market can only reach 99.5% (Note: The purity of general electrical aluminum is above 99.7%). Moreover, the aluminum in the copper-aluminum transition terminal is also manufactured and solidified and quenched with relatively poor conductivity. Therefore, the integrated conductivity of these copper-aluminum transition terminals can only be less than 54% IACS. The rate requirement is above 61% IACS), which causes the electrical performance of the terminal and aluminum alloy cable to be mismatched. As a result, the transmission line resistivity increases by 21% or more, the line transmission capability decreases by 21% or the line loss increases by more than 21%. The ability to use aluminum alloy cables for power transmission can be fully realized by using aluminum-alloy copper-aluminum terminals.
As for the other aluminum alloy terminals with inconsistent performance of AA-8000 conductor aluminum alloy, due to differences in the physical, mechanical, electrical, compressive creep properties of the material and AA-8000 conductor aluminum alloy performance, if such terminals for aluminum It is self-evident that problems such as hidden safety problems will be caused by the connection of alloy cables.
Therefore, the fact that users and related industry personnel must clearly understand is:
To ensure that the advantages and value of aluminum alloy cables can be brought into play and embodied, the preconditions for the safe and non-hidden application of aluminum alloy cables are: the aluminum alloy cables complying with the standard requirements plus the matching supporting aluminum alloy soft copper and aluminum terminals for cable performance use.