Power cable is used to transmit and distribute electric energy,. It is commonly used in urban underground power grid Power station outgoing line, internal power supply of industrial and mining enterprises and underwater transmission lines across rivers and oceans.
In power lines, the proportion of cables increases gradually.. Power cable is a cable product used to transmit and distribute high-power electric energy in the main line of power system, including power cables with various voltage levels of 1-500 kV and above and various insulation..
Power cable structure
The basic structure of power cable consists of wire core (conductor). Insulation. Shielding layer and protective layer are composed of four parts.
core
The core is a conductive part,. Used to transmit electric energy,. It is the main part of power cable.
Insulation barrier
The insulating layer is an indispensable part of the structure,. It electrically isolates the core wire from the earth and the core wires of different phases,. To ensure the transmission of electric energy..
Shielding layer
Power cables of 15kV and above generally have conductor shielding layer and insulation shielding layer..
Protective layer
The function of the protective layer is to protect the power cable from external impurities and moisture,. Prevent direct damage to power cables by external forces.
Research on power cable industry
Main advantages of power cable
1. Less land is occupied. It is usually buried in the soil or laid indoors, in ditches and tunnels,. The insulation distance between lines is small, and no tower is required,. It covers a small area,. The space on the ground is basically not occupied.
2. High reliability. It is less affected by climatic conditions and surrounding environment,. Stable transmission performance and high reliability.
There are more favorable conditions for developing high voltage and large capacity, such as low temperature and. Superconducting power cable, etc..
4. Large distributed capacitance.
5. Less maintenance work..
6. The possibility of electric shock is small..

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