Copper Electrical Wire consists of a conductor, an insulating layer, a shielding layer and a protective layer.
The conductor is the conductive part of the wire and cable and is used to transport electrical energy, which is the main part of the wire and cable.
The insulating layer electrically isolates the conductor from the earth and the conductors of different phases to ensure the transmission of electric energy, and is an indispensable component in the structure of the wire and cable.
Wire and cable of 15KV and above generally have a conductor shield and an insulating shield.
The protective layer
The protective layer serves to protect the wire and cable from intrusion of foreign matter and moisture, and to prevent external forces from directly damaging the power cable.
1. Low resistivity: The resistivity of aluminum wire cable is about 1.68 times higher than that of copper wire cable.
2. Good ductility: The elongation of copper alloy is 20~40%, the elongation of copper for electricians is above 30%, and the aluminum alloy is only 18%.
3. High strength: Allowable stress at room temperature, copper is 7~28% higher than aluminum. Especially the stress at high temperature, the difference between the two is far.
4. Anti-fatigue: Aluminum is easy to break under repeated bending, and copper is not easy. In terms of elasticity, copper is also about 1.7 to 1.8 times higher than aluminum.
5. Good stability, corrosion resistance: copper wire is resistant to oxidation and corrosion, and aluminum wire is susceptible to oxidation and corrosion.
6. Large current carrying capacity: Due to the low resistivity, the copper wire cable of the same section is 30%-50% higher than the allowable current capacity (the high current that can be passed) of the aluminum wire cable, especially the household appliances are more and more. The home is basically made of copper wire.
7. Low voltage loss: Due to the low resistivity of the copper wire cable, the same current flows through the same section. The copper cable has a small voltage drop. Therefore, the same transmission distance can guarantee higher voltage quality; or, under the allowable voltage drop condition, the copper wire cable can reach a long distance, that is, the power supply coverage area is large, which is conducive to network planning and reduction. The number of power points set.
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