Copper and aluminum which is better
Copper and aluminum which is better? Copper and aluminum wire have their own uses as the most commonly used metals in power systems, as well as their respective advantages and disadvantages. Only by clarifying the advantages and disadvantages of both of them and characteristics can be properly drawn, make the best use. Otherwise it is easy to cause improper use, ranging from the line damage, heavy cause fire.
1, copper advantages and disadvantages:
(1) Low resistivity: The resistivity of an aluminum cable is about 1.68 times higher than copper cable.
(2) good ductility: copper alloy elongation of 20 to 40%, electrical extension rate of copper in more than 30%, while the aluminum alloy is only 18%.
(3) high strength: allowable stress at room temperature, copper, respectively, higher than the aluminum 7 to 28%. Especially under high- temperature stress, the difference between the two is even farther.
(4) anti-fatigue: aluminum easy to break repeated bending, copper is not easy. Elasticity indicators, copper is also about 1.7 to 1.8 times higher than aluminum.
(5) good stability, corrosion resistance: copper anti-oxidation, corrosion resistance, and aluminum vulnerable to oxidation and corrosion.
(6) Anti-oxidation, corrosion resistance: Copper cable connector performance is stable, will not be due to oxidation accidents. Aluminum wire cable joints often unstable due to oxidation of the contact resistance increases, heat and accidents. Therefore, the accident rate is much larger than copper cables. Especially in some copper and aluminum docking place, a little did not take a long time on the problem. Therefore, the copper and aluminum must be strictly connected docking requirements.
(7) Construction convenience:
① copper flexible, allowing a small radius of curvature, so easy to bend, wear tube easy;
② copper anti-fatigue, repeated bending is not easy to break, so convenient wiring;
③ The high mechanical strength of copper can withstand greater mechanical tension, laying a great convenience to the construction laying, but also to create the conditions for mechanized construction.
Disadvantages of
copper wire
Copper prices are high, a large proportion of copper, the two determine the high cost of copper. As a cable with a lot of advantages, is the high cost! Therefore, we do not have a common overhead line copper wire, it is good is good is too heavy, so overhead lines are often much more aluminum, copper wire is usually used in the ground.
2, aluminum advantages and disadvantages:
(1) Cheap: the copper rod is 3.5 times the price of aluminum rod, aluminum is 3.3 times the proportion of aluminum, aluminum wire cable is much cheaper than copper wire and more suitable for low-cost projects or temporary electricity.
(2) The cable is very light: the weight of the aluminum cable is 40% of the copper cable, and the construction and transportation costs are low.
(3) Anti-oxidation and anti-corrosion: Aluminum reacts with oxygen in the air to form an oxide film quickly to prevent further oxidation. Therefore, aluminum wire is a necessary material for overhead transmission with high voltage, large cross-section and long- Low-voltage lines for these advantages no longer exist.
Aluminum shortcomings:
Low electrical conductivity of aluminum wire, large electrical loss, poor tensile strength, low corrosion resistance, particularly vulnerable to oxidation at the joint, if the connection with the copper wire, due to the potential difference between the joints, more prone to corrosion, easy to cause breaking assessment . These are relative to the use of low-voltage lines, but the advantages of aluminum lines on high-voltage lines are also quite obvious, which we have to figure out.
Copper and aluminum which is better? The above point to introduce the advantages and disadvantages of copper and aluminum, and now we all know how to choose the right line. If you have cable needs, please contact us!
