The reason why aluminum alloy cables are slowly entering the domestic market is that copper resources are in short supply and copper prices are rising. This aluminum alloy material is superior to copper in terms of toughness, tensile strength and weight, and the cross section of the aluminum alloy is only 1.1 to 1.2 times larger than that of copper under the same current carrying capacity. Prices are also lower than copper prices.
Comparison of advantages and disadvantages between copper core cable and aluminum alloy cable:
The copper core cable has a low resistivity: the electrical resistivity of the aluminum core cable is about 1.68 times higher than that of the copper core cable.
Copper core cable has good ductility:
The strength of the copper core cable is high: the allowable stress at room temperature, copper can reach 20, and aluminum is 15.6 kgt/mm2.
Copper core cable is anti-fatigue: aluminum is easily bent and broken, and copper is not easy.
Copper core cable has good stability and corrosion resistance: the copper core is resistant to oxidation and corrosion, and the aluminum core is susceptible to oxidation and corrosion.
Advantages of copper core cable:
The copper core cable has a large current carrying capacity: due to the low resistivity, the copper core cable of the same cross section is about 30% higher than the allowable current carrying capacity of the aluminum core cable (the maximum current that can be passed). The copper core cable has a low voltage loss: due to the copper core cable The resistivity is low and the same current flows through the same section. The copper core cable has a small voltage drop. Therefore, the same transmission distance can guarantee higher voltage quality; or, under the allowable voltage drop condition, the copper core cable can reach a long distance, that is, the power supply coverage area is large, which is conducive to network planning and reduction. The number of settings for the power supply point.
Copper core cable has a low heating temperature: at the same current, the copper conductor of the same section has a much lower heat generation than the aluminum core cable, making operation safer.
Copper core cable has low energy consumption: due to the low resistivity of copper, the copper cable has low power loss compared to aluminum cable, and the copper core cable is resistant to oxidation and corrosion: the connector of the copper core cable is stable and will not be oxidized. And an accident occurred. When the joint of the aluminum core cable is unstable, the contact resistance is increased due to oxidation, and an accident occurs due to heat generation. Therefore, the accident rate is much larger than that of copper core cables.
Convenient construction of copper core cable: Because the copper core is flexible, the allowable bending radius is small, so the turning is convenient, and the pipe is easy to wear; because the copper core is resistant to fatigue and repeated bending, it is not easy to break, so the wiring is convenient; and because the copper core has high mechanical strength Can withstand large mechanical tension.