power cable, for power transmission and distribution cables. Commonly used in the urban underground power grid, power stations leads to lines, industrial and mining enterprises of the internal power supply and the river, harbor underwater transmission line. In the power lines, cables proportion is gradually increasing. Power cable is the main power system at the line for high-power electricity transmission and distribution cable products, including 1-500KV and above all voltage levels, a variety of insulated power cables.
　　The basic structure
　　The basic structure of the power cable from the line core (conductor), insulation, shielding layer and protective layer composed of four parts.
　　(1) line core
　　Cable core is conductive part of the Power Cable used to transfer electrical energy, the main part of the power cable.
　　(2) insulation
　　Insulation layer is the earth and the wire core and the core line between the different phases in the electrical isolation from each other to ensure the power transmission, power cable structure is an integral part.
　　(3) shield
　　15KV and above generally have a power cable conductor shield and insulation shield.
　　(4) protective layer
　　Protective layer is to protect the Power Cable from external impurities and moisture intrusion, and to prevent direct damage to the external power cable.