Allowable stress at room temperature, copper is 7~28% higher than aluminum. Especially the stress at high temperatures, the difference between the two is even more distant.
The electrical resistivity of the aluminum core cable is about 1.68 times higher than that of the copper core cable.
The elongation rate of copper alloy is 20~40%, the elongation rate of copper for electricians is above 30%, and the aluminum alloy is only 18%.
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).
Due to the low resistivity of copper, compared to aluminum cables, the power loss of copper cables is low, which is obvious. This is conducive to improving power generation efficiency and protecting the environment.
the copper core is anti-oxidation, and corrosion-resistant, and the aluminum core is susceptible to oxidation and corrosion.
1 The copper core is flexible, and the allowable bending radius is small, so the turning is convenient and the pipe is easy to wear.
2 The copper core is resistant to fatigue and repeated bending is not easy to break, so the wiring is convenient.
3 The mechanical strength of the copper core is high, Can withstand large mechanical tension, bring great convenience to construction, and also create conditions for mechanized construction.
Due to the low resistivity of the copper core cable, 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.
Aluminum repeated bending is easy to break, copper is not easy. In terms of elasticity, copper is also about 1.7 to 1.8 times higher than aluminum.
Copper core cable connector performance is stable, and will not cause accidents due to oxidation.
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.
Under the same current, the copper core cable of the same section has a much smaller heat generation than the aluminum core cable, making the operation safer.
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