Note: the data of the above three kinds of conductors after full annealing (soft state). The copper-clad aluminum conductor in the table is the self-made product of our company using special aluminum rod, which is different from other manufacturers in the industry. A solid molecular metallurgical combination is formed between the copper layer and the aluminum rod core wire. Its surface is bright and round without any defects. The volume ratio of copper to aluminum is 15:85 and the weight ratio is 38:62

Main factors affecting power transmission by cable

The ability of cable to transport charge mainly depends on the material of conductor, cross-sectional area, voltage level and working environment temperature. For conductors of the same length and specification, the higher the voltage is, the more charges are transferred between the molecules of the conductor, that is, the stronger the transmission capacity is; for conductors of different materials with the same voltage, the transmission capacity is determined by the movement capacity of the molecules of the materials, the more active the molecular movement is, that is, the stronger the conduction capacity is, the larger the cross-sectional area of the same material is, the stronger the transmission capacity is, the higher the working environment temperature is, and the weaker the transmission capacity is The stronger it is. The research shows that the activity of copper molecule is much stronger than that of aluminum molecule. Because the outer circle of copper-clad aluminum conductor is copper, when the current on copper-clad aluminum conductor increases, copper becomes the main carrier of charge transfer, and the charge of inner core aluminum is much less than that of copper in unit area, and copper-clad aluminum cable can better reflect the skin effect and proximity effect of conductor.

Attachment:

(1) Skin effect - when alternating current passes through a conductor, due to the uneven current distribution on the induced working surface, the closer the conductor is to the surface, the greater the current density is. This phenomenon is also called skin effect.

(2) Proximity effect when a current of a certain frequency passes through an adjacent conductor, the current is deflected to one side due to the magnetoelectric effect, so that the current flows along the surface close to the adjacent conductor in the conductor.

(3) Direct resistance current is the inherent characteristic of conductor material, which mainly refers to the repulsive force generated by the mutual motion between material molecules