Power cables are cables used to transmit and distribute electrical energy. Power cables are often used in urban underground power grids, power station outgoing lines, internal power supply in industrial and mining enterprises, and power transmission lines across the river and sea. Power cable is a cable product used to transmit and distribute high-power electrical energy in the main line of the power system, including 1-500KV and above various voltage levels, various insulated power cables.

The basic structure of a power cable is composed of a core (conductor), an insulating layer, a shielding layer, and a protective layer. The core is the conductive part of the power cable, used to transport electrical energy, and is the main part of the power cable; the insulation layer electrically isolates the core from the earth and the cores of different phases to ensure the transmission of electrical energy. It is the structure of the power cable. It is an indispensable component; 15KV and above power cables generally have conductor shielding layer and insulation shielding layer; the role of the protective layer is to protect the power cable from external impurities and moisture, and prevent external forces from directly damaging the power cable.