1. Low resistivity: The resistivity of aluminum core cable is about 1.68 times higher than that of copper core cable.
2. Good ductility: the ductility of aluminum alloy is 20-40%, that of electrical copper is over 30%, while that of aluminum alloy is only 18%.
3. High strength: the allowable stress at room temperature, copper is 7-28% higher than aluminum respectively. Especially the stress at high temperature, there is a big difference between them.
4. Anti-fatigue: Aluminum is easy to break after repeated bending, but steel is not easy. In terms of elasticity index, steel is also about 1.7-1.8 times higher than aluminum.
5. Good stability and corrosion resistance: the copper core is oxidation-resistant and corrosion-resistant, while the aluminum core is susceptible to oxidation and corrosion.
6. Large current carrying capacity: Because of the low resistivity, the current carrying capacity (the maximum current that can pass through) of copper-core cable with the same cross section is about 30% higher than that of aluminum-core cable.
7. Low voltage loss: due to the low resistivity of steel-core cable, under the condition that the same current flows in the same section. The voltage drop of copper core cable is small. The same transmission distance can ensure higher voltage quality; Under the condition of allowable voltage drop, the electric energy of the copper core cable can reach a long distance, that is, the power supply coverage area is large, which is beneficial to the network planning and reduces the number of power supply points.
8. Low heating temperature: Under the same current, the heating value of steel-core cable with the same section is much smaller than that of aluminum-core cable, which makes the operation safer.
9. Low energy consumption: As the resistivity of copper is low, compared with aluminum cable, the power loss of copper cable is low, which is obvious. This is conducive to improving the utilization rate of power generation and protecting the environment.
10. Oxidation resistance and corrosion resistance: the connector of copper core cable has stable performance, and no accident will occur due to oxidation. Unstable joints of aluminum-cored cables often cause accidents due to the increase of contact resistance and heat caused by oxidation. Therefore, the accident rate is much higher than that of copper cable.
11. Convenient construction: copper has good flexibility, and the allowable bending radius is small, so it's convenient to turn and pipe threading; The copper core is fatigue-resistant and not easy to break after repeated bending, so the connection is convenient; The copper core has high mechanical strength and can bear large mechanical tension, which brings great convenience to construction and laying, and also creates conditions for mechanized construction.
