1.the advantages of copper clad aluminum cable:

(1) DC resistivity: the resistivity of copper-clad aluminum wire is larger than that of pure copper wire, which is about 1.5 times that of pure copper wire. When the resistance value is the same (the cross-sectional area is larger than that of copper), the weight of copper-clad aluminum wire is about pure copper. 1/2 of the line. According to the skin effect calculation, at high frequencies above 50MHz, the resistivity is equal to that of copper conductors with the same cross-section. In the use of power cables with a frequency of 50Hz, the skin effect and proximity effect of the copper conductors are gradually prominent when they are above 150mm2. If there is a fault, the energy that generates high-order harmonic current will be injected into the power supply system, and a high-order harmonic voltage of the corresponding frequency will be generated on the impedance of the system, causing the waveform of the voltage to be distorted, increasing the loss of the power supply system, and increasing the heating of the conductor; In addition, cables amplify harmonics, creating overvoltages at the splice that can damage the cable ends. The use of copper-clad aluminum conductors will reduce the AC impedance (resistance) generated by higher harmonics. In other applications, the copper-clad aluminum conductor can meet the DC resistance requirements of the conductor within the upper limit of the outer diameter of the existing conductor of the same specification by taking the volume of copper in the copper-clad aluminum monofilament and corresponding technological measures.

(2) The use of copper-clad aluminum conductors can meet the current habits of wire and cable in product selection, design, use, installation, etc. that have lasted for many years.

(3)Reduce the AC resistance:

1) The AC resistance is the main basis for the current carrying capacity. According to the principle of the skin effect, the current passing through the unit area of the surface of a single wire is larger than the current passing through the unit area of the center of the wire. The center of the conductor is within the area of the circle composed of the same conductor, and the current passing through the center is smaller than that of the circumference, so it is the most reasonable and economical to use different metals for the center conductor and the circumference conductor.

2) In addition to the DC resistance and the skin effect, there is also the proximity effect affecting the AC resistance index. Compared with the copper conductor with the same DC resistance, the copper-clad aluminum conductor with enlarged cross-section should be used. In a single conductor, aluminum is in the center of the circle. , copper is in the outer circle; the enlarged copper-clad aluminum conductor increases the surface area of the conductor due to the increase in the total cross-section of the conductor, improves the heat dissipation conditions of the cable, and increases the heat dissipation area, while the thermal conductivity of aluminum is similar to that of copper, and the same Under the condition of material cost, the indicator of AC resistance is much more economical.

(4)It has good corrosion resistance: aluminum is easier to corrode than copper, but because the copper-clad aluminum material has been completely metallurgized, the aluminum is completely covered by copper, and will not be contacted by water and air, which fully achieves the same performance as copper. For aluminum conductors, especially in coastal areas, the chloride ions contained in the salt mist in the atmosphere will condense on the surface of aluminum, which is easy to cause local corrosion around impurities and defects on the surface, forming holes, cracks and micro-batteries, aggravating the corrosion of aluminum conductors .

(5) Low cost and light weight: Compared with copper core wires with the same technical indicators, copper-clad aluminum conductor cables can save more than 40% of the cost. The proportion of copper-clad aluminum wire is only 37%-40% of that of pure copper wire. When the wire diameter and weight are equal, its length is 2.5 times that of pure copper wire.

(6)Good weldability: The copper-clad aluminum wire has the same weldability as the pure copper wire because its surface is concentrically coated with a layer of pure copper, which is convenient for production.

2. the use range and product characteristics of copper clad aluminum conductor wire and cable

(1) Scope of use

PVC insulated wire and cable with rated voltage of 450/750V (below 1Kv) and below, suitable for fixed installation of lighting and electrical power devices with AC rated voltage of 450/750V and below, and power transmission and distribution systems below 1Kv, for power supply, transmission and distribution use. Widely used in electric power, construction, mining, metallurgy, petrochemical, transportation and other departments. In a good use environment, it can be used continuously within the rated voltage and current levels, and the service life is the same as that of copper cables.

(2) Product Features

1) It has good corrosion resistance and low conductor contact resistance. Under normal circumstances, aluminum is easier to corrode than copper, but because copper-clad aluminum is completely covered by copper, the weaknesses of aluminum conductors such as easy oxidation and high contact resistance are improved.

2) It has good weldability. The copper-clad aluminum wire has the same weldability as the pure copper wire because its surface is covered with a layer of pure copper. It avoids the hidden danger that the aluminum core cable will be burnt due to corrosion, bumps or poor compression and tin-free welding during long-term use.

3) Light weight, soft wire quality, easy processing, easy installation and transportation.

4) Copper-clad aluminum material has the advantages of relatively low cost and relatively stable price, which overcomes the disadvantages of high cost and price fluctuation of copper material.

5) Compared with pure copper conductors, copper-clad aluminum has the advantages of pure copper conductors, and its AC resistance is higher than that of copper under the same conditions as the DC resistance of the conductors and the DC resistance of pure copper (the cross-sectional area is larger than that of pure copper). Small, the current carrying capacity is 2%-5% larger than that of copper conductors (the larger the cross-sectional area, the more obvious the effect). Its cable line loss, temperature rise, higher harmonics and other technical indicators are better than copper conductor cables. Connected to the same copper terminal block, the temperature rise at the joint is lower than that of copper.