What is a power cable?

Power cables are cables used for transmitting and distributing electrical energy. They are commonly used in urban underground power grids, power station outgoing lines, internal power supply for industrial and mining enterprises, and underwater transmission lines across rivers and seawater. In power lines, the proportion of cables is gradually increasing. Power cables are cable products used to transmit and distribute high-power electrical energy in the main lines of the power system, including various voltage levels of 1-500KV and above, and various insulated power cables.

Basic structure of power cables

The basic structure of power cables consists of four parts: core (conductor), insulation layer, shielding layer, and protective layer. 1. Wire core, which is the conductive part of a power cable used to transmit electrical energy, is the main part of the power cable; 2. Insulation layer is an indispensable component in the structure of power cables, which electrically isolates the wire core from the ground and between wire cores of different phases, ensuring the transmission of electrical energy; 3. Shielding layer: Power cables of 15KV and above generally have conductor shielding layer and insulation shielding layer; 4. Protective layer: The function of the protective layer is to protect the power cable from external impurities and moisture intrusion, as well as to prevent direct damage to the power cable by external forces.

What requirements do power cables need to meet?

(1) Capable of withstanding grid voltage. Including working voltage, fault overvoltage, atmospheric and operating overvoltage; (2) Can transmit the power that needs to be transmitted. Including current under normal and fault conditions; (3) It can meet the mechanical strength and flexibility required for installation, laying, and use, and is durable and reliable; (4) Rich material sources, economy, simple process, and low cost.