Copper clad aluminum cable actually very interesting globledata P over the years, about the copper clad aluminum cable performance, application range, such as discussion has never been interrupted, the copper clad aluminum cable has caused high attention in the industry, the important reason is natural raw material with high -
And on the other hand, increase the research and development and performance improvement of copper clad aluminum cable, a certain sense, also can promote the development of Chinese wire and cable industry, for the enterprise, but also has the certain practical significance.
Therefore, copper clad aluminum cable though practice for many years, but to this day, even in large aluminum alloy cable Fried, Fried, discussion of copper clad aluminum cable has been continued.
Cable according to the different inner conductor, there are two main types, one is pure copper material, is a kind of copper clad aluminum material.
Copper Clad Aluminum English is: Copper Clad Aluminum, Copper Clad Aluminum conductor is often referred to as: CCA conductor.
Copper clad aluminum composite wire first introduced from Germany in the last century s, then in Britain, the United States, France and other countries to promote, widely used in various fields.
CATV cable in the United States as early as the year begins to try copper clad aluminum wire, consumption quantity into tons/year.
American states have now with copper clad aluminum (
Cable instead of the pure copper cable.
In recent years, China's copper clad aluminum CATV cable also began to be a large number of use.
Countries in the years of formulated the industry standard SJ/T, vigorously to promote the use of copper clad aluminum cables.
At present, Shanghai, guangzhou, zhejiang, liaoning and other places of cable television has been widely used copper clad aluminum cable, responded well.
Copper clad aluminum in the aluminum or aluminum/steel alloy copper core material surface with pericardium, the drawing and the copper layer thickness.
Mm and above.
Due to the high frequency signal transmission on conductor with the characteristics of the skin effect, the cable TV signal.
Mm above the surface of the copper layer, copper clad aluminum inner conductor can completely meet the requirements of signal transmission, the transmission properties of the signal is consistent with the same diameter copper body.
The copper clad aluminum cable with pure copper cable in what is the difference between the various performance, what are the advantages of what?
First, in terms of mechanical properties, pure copper conductor strength, elongation, larger than the copper clad aluminum conductor is pure copper in mechanical performance is better than copper clad aluminum.
From the perspective of cable design, pure copper conductors than copper clad aluminum conductor mechanical strength good advantages, in the process of practical application does not necessarily need to.
Copper clad aluminum conductor, much lighter than pure copper, so copper clad aluminum cable on the overall weight is lighter than pure copper conductor cable, this will give the transport of the cable and cable erection construction convenient.
Other than pure copper soft copper clad aluminum, copper clad aluminum conductor cable production in terms of flexible cable is better than pure copper.
Secondly, in terms of electrical performance, because of poor conductivity than copper, aluminum makes the dc resistance of copper clad aluminum conductor is larger than pure copper conductor, this presence of influence mainly to see if the cable is with power supply, such as supplies power to the amplifier, if be used to power supply, copper clad aluminum conductor will lead to additional power consumption, voltage lower more.
When more than MHz frequency, at this time of ac resistance attenuation under the two different conductor has no significant difference between the two.
Of course, this is mainly because the skin effect of high frequency current, the higher the frequency, the flow of electric current is more close to the conductor surface, on the surface of copper clad aluminum conductor in pure copper material, at some point when the frequency is high, the current to flow in copper plating quality inside.
In MHz cases, the current in the near surface.
Mm thickness, the thickness of copper and copper clad aluminum conductor thickness is about twice as many than that.
For coaxial cable, because the signal transmission is above MHz, so the copper clad aluminum conductor and pure copper conductor transmission effect is the same.
In the actual test the attenuation of the cable to prove it.
Again, from the aspects of economy, copper clad aluminum conductor are sold by weight, of pure copper conductor is sold by weight, the price of copper clad aluminum conductor is more expensive than the same weight of pure copper conductor.
But the same weight of copper clad aluminum conductor length is much longer than pure copper, and is calculated on the length of the cable.
The same weight of copper clad aluminum wire is copper wire length.
Times, the price is just more than a few hundred yuan per ton.
Comprehensive, copper clad aluminum would be advantage.
Because of the copper clad aluminum cable comparatively light, and the transportation cost of the cable, erectness cost will be reduced, can bring certain convenience to construction.
In addition, copper clad aluminum cable compared with pure copper cable, easy maintenance, lower maintenance costs.
Use of copper clad aluminum can reduce the network failure, avoid network personnel during maintenance 'cut cut core in winter, summer skin' (
Aluminum or aluminum tube with longitudinal bag products)
Due to the copper aluminum inner conductor and outer conductor of the cable thermal expansion coefficient is large, in the hot summer, aluminum outer conductor for large, copper inner conductor relative retraction, not fully come into contact with the elastic contact within F head block;
Outside in the cold winter, aluminum conductor shrinkage is larger, the shield falls off.
When in the coaxial cable with copper clad aluminum conductor, it differ with aluminum outer conductor thermal expansion coefficient is small, the temperature changes, greatly reduced the cable core pulling fault, improve the quality of the network transmission.
Wire and cable industry with copper clad aluminum wire is also a good way to alleviate the pressure of the present enterprise, aluminium wire outside the bread a layer of copper by the control of double wire, because with a small specific gravity, as well as good transmission performance, particularly applicable to do the inner conductor of the coaxial cable of the radio frequency, compared with pure copper wire, its density is about pure copper %.
And transfer characteristic is better than that of pure copper wire, is the ideal of the coaxial cable of the radio frequency branch line of inner conductor.
The future of the development of copper clad aluminum cable products, still need the wire and cable industry, as well as the production enterprise to improve performance through efforts, efforts to popularize products related knowledge perspective application promotion, so as to contribute to China's cable industry and stronger.