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Performance comparison of copper and copper clad aluminum wire

2/12/2012 6:20:32 AM
Cable inner conductor different points, there are mainly two, one is pure copper, a copper clad aluminum material. Copper clad aluminum in English is: Cooper, Clad Aluminum, copper clad aluminum conductor is often referred to as: the CCA conductor. Copper clad aluminum composite wire was first proposed by Germany in the 1930s of the last century, and then in the UK, U.S., France and other countries to promote, widely used in various fields. CATV cable in the United States as early as 1968 trial of copper clad aluminum wire, the consumption quantity of 30,000 tons / year. American States have copper clad aluminum (steel) cable instead of a pure copper cable. In recent years, the CATV cable, copper clad aluminum in China has been large-scale use. Countries in 2000 to develop the industry standard --SJ/T11223-2000, promote promote the use of copper clad aluminum cable. At present, Shanghai, Guangzhou, Zhejiang, Liaoning and other cable stations have been commonly used copper clad aluminum cable, the favorable response.

Copper clad aluminum concentric surface of aluminum or aluminum steel alloy core material coated copper layer by drawing from the copper layer thickness more than 0.55mm. Skin effect, characterized by high frequency signal transmission conductor cable TV signals passing 0.008mm above the surface of the copper layer, the copper clad aluminum conductor can fully meet the requirements of signal transmission, the transmission characteristics of the signal with the same diameter wire copper the bulk phase.

Copper clad aluminum and copper magnet wire for the comparison of the following three aspects:
The strength, elongation of the mechanical properties of pure copper conductors than copper clad aluminum conductor large, that is pure copper in the mechanical properties of copper clad aluminum. From the point of view of the cable design, pure copper conductors than copper clad aluminum conductor mechanical strength to good advantage, and do not necessarily need the actual application process. Copper clad aluminum conductor is a lot lighter than pure copper, copper clad aluminum cable in the overall weight lighter than pure copper conductor cable, this will give the cable transport and cable erection convenience. In addition copper clad aluminum is softer than pure copper, the production of copper clad aluminum conductor cable in terms of softness better than pure copper cable.

The electrical properties of aluminum conductive than copper, copper clad aluminum conductor DC resistance than pure copper conductors, this point whether the impact is mainly to see the cable will be used to power supply, provides power to the amplifier, if it is used to supply, copper clad aluminum conductor will lead to additional power consumption, the voltage reduces. When the frequency is more than 5MHz, when the AC resistance attenuation was no significant difference in these two different conductors. Of course, this is mainly because of the high-frequency current skin effect, the higher the frequency of current flow is more close to the conductor surface, the surface of virtually pure copper in the copper clad aluminum conductors, when the high frequency to a certain time, the entire current plating flow in the copper material inside. 5MHz case, the current flow near the surface of about 0.025 mm thickness, copper clad aluminum conductor copper layer thickness than the thickness of more than approximately double. For coaxial cable, because the transmitted signal at 5MHz above the copper clad aluminum conductor and copper conductor transmission effect is the same. In the actual test cable attenuation can prove it. Copper clad aluminum than pure copper conductor flexible, easy to handle straightening in the production process than copper clad aluminum cable with copper conductor cable return loss can be said, therefore, to a certain extent.

Economic copper-clad aluminum conductors is sold by weight, pure copper conductors is also sold by weight, the price of copper clad aluminum conductors than the same weight of pure copper conductor expensive. The same weight of copper clad aluminum than pure copper conductor length a lot, while the cable is calculated according to the length. The same weight, the copper clad aluminum wire is 2.5 times the copper wire length, and the price is just a few hundred dollars per ton. Taken down, copper clad aluminum on the very edge. Bring some light copper clad aluminum cable, cable, transportation costs, installation erection costs will decrease, will give the construction convenience.

Easy to maintain the sexual use of copper clad aluminum can reduce the network failure, to avoid network maintenance Fuyuko shear core, Natsuko cut the skin "(ribbon longitudinally or aluminum products). Cable copper conductor and aluminum outer conductor thermal expansion coefficient is larger in the hot summer months, the aluminum outer conductor done larger copper conductor relative retraction, can not be fully exposed to the elasticity of contacts in the F head; in cold winter, aluminum outer conductor shrink large, so that the shield off. When the coaxial cable using copper clad aluminum conductor, which difference and coefficient of thermal expansion of the aluminum outer conductor small temperature changes, the failure of the cable core pulling greatly reduced, to improve the quality of network transmission.
In general, the overall performance of copper clad aluminum conductor than pure copper conductor, it will save the user's costs.

The industry believes that the wire and cable industry with copper clad aluminum wire is also a good way to ease the current business pressures. Aluminum wire wrapped in a layer of copper drawn from the bimetallic wire with a small proportion, transmission performance, in particular, apply to a RF coaxial cable inner conductor, compared with the pure copper wire, the density of pure copper for about 40%. The transmission characteristics better than pure copper wire, is a branch line of the best RF coaxial cable inner conductor.