Power cable, as an indispensable part of modern power system, undertakes the important task of power transmission and distribution. This paper aims to deeply analyze the definition and characteristics of power cable.

Definition and basic structure of power cable
Power cable refers to the cable used to transport and distribute electric energy, which plays a vital role in many scenarios such as urban underground power grid, power station extraction line, industrial and mining enterprise internal power supply and underwater transmission lines across the river and sea. Power cable is mainly composed of four parts: core (conductor), insulation layer, shielding layer and protective layer.

1. Wire core (conductor) : The wire core is the core of the power cable and is responsible for transmitting electrical energy. It is usually composed of multiple wires twisted, and its material and cross-sectional area are directly related to the electrical performance and transmission capacity of the cable.

2. Insulation layer: The insulation layer is located outside the core, the main function is to isolate the electrical connection between the core and the earth and different phases of the core, to ensure the safe transmission of electric energy. The material and thickness of the insulation layer have an important effect on the electrical safety and service life of the cable.

3. Shielding layer: The role of shielding layer is to optimize the electric field distribution and reduce tangential stress, for multi-core cables, it is also necessary to increase the core and filler between the insulated wire core to enhance the stability of the cable structure and reduce electromagnetic interference.

4. Protective layer: The protective layer is located on the outer layer of the cable, and its purpose is to protect the cable from the influence of the external environment, such as mechanical damage, chemical corrosion, etc., to ensure the long-term stable operation of the cable.

Second, the main characteristics of power cables
Power cables are characterized by their well-designed structure and the selection of cable materials to adapt to a variety of complex environments and needs.

1. Structural composition: The structural composition of the power cable includes the core, insulation layer, shielding layer and protective layer, as well as the filling structure and tensile elements, which together constitute the stable transmission capacity of the power cable.

2. Performance characteristics: Power cable has excellent electrical performance and mechanical strength, can adapt to a variety of complex geographical and environmental conditions, to achieve safe power transmission.

As an important power transmission equipment, power cable plays an indispensable role in modern power system due to its structure and performance. Relevant people need to have a deep understanding of its working principle and characteristics to ensure the stable operation of power cables and the safe transmission of electric energy.

Qingdao Tianxing Cable Co., Ltd. focuses on the production of customized wire and cable manufacturers, main: fire wire and cable, power cable, control cable, home improvement wire and other products, exported to more than 40 countries and regions around the world, the annual production capacity of 1 billion yuan. 6000 square meters of storage, standing hundreds of millions of inventory, order demand for rapid distribution and delivery, large prices more favorable.