Aluminum core cables are often used for limited budget or temporary power supply on construction sites due to their cheap price, cost-saving, light weight and easy movement. The joints of aluminum core cables are particularly prone to oxidation and are often used on overhead cables.
In addition, aluminum core cables can be used in the wind inlet inclined shaft, bottom shaft parking lot, underground central substation to mining area substation, bottom shaft parking lot, etc., and copper core cables are used in other places. Although aluminum core cables are cheap, copper cables have outstanding advantages in cable power supply, especially in the field of underground cable power supply.
Which is more suitable for aluminum core cables and copper core cables? We can compare the electrical conductivity, processing performance and economic performance of the cables:
- Electrical conductivity
In order to reduce the energy loss and voltage drop in the cable conductor, the conductor of the power cable is generally made of copper and aluminum with high conductivity. The electrical conductivity of copper is calculated at 100% IACS, and the electrical conductivity of aluminum is about 61% IACS. Under the premise of the same conductor cross-sectional area, the conductivity of aluminum core cables is lower than that of copper core power cables.
- Processing performance
Copper has good ductility and strong mechanical properties, so when the conductor of the copper core power cable is pressed tightly by a single wire, it will not break even if the degree of deformation is large; while the mechanical properties of aluminum are poor, and it will At the same time, if the compression coefficient is high, the conductor will have burrs, broken wires, or even breakage.
- Economic performance
Under the condition of the same current carrying capacity, the cross-sectional area of the aluminum core cable is about 1.5 times that of the copper core cable, and the corresponding line protection cost and civil construction cost will also increase. Therefore, as a permanent power distribution, under the condition of acceptable funds , considering comprehensive operation safety, it is recommended to use copper core cables.
In practical applications, whether to choose copper core power cables or aluminum core or aluminum alloy core power cables needs to be studied and evaluated in detail. The selection criteria will not only need to consider the traditional elements such as the initial cost, electrical performance and mechanical performance of the cable, but also include various elements throughout the production, use, maintenance and post-processing of the cable.