The structure of the power line is not very complex
But don’t simply see through it from the surface. If you study the power cord well, some places still need to be professional to understand the structure of the power cord.
The structure of power line mainly includes outer sheath, inner sheath and conductor. Common transmission conductors include copper and aluminum wire.
Outer sheath
The outer sheath, also known as protective sheath, is the outermost layer of sheath of the power line. This layer of outer sheath plays the role of protecting the power line. The outer sheath has strong characteristics, such as high temperature resistance, low temperature resistance, resistance to natural light interference, good winding performance, high service life, material environmental protection and so on. Inner sheath: the inner sheath, also known as the insulating sheath, is an indispensable intermediate structure part of the power line. As the name suggests, the main use of the insulating sheath is insulation to ensure the power on safety of the power line, so that there will be no leakage between the copper wire and the air, and the material of the insulating sheath should be soft to ensure that it can be well embedded in the intermediate layer.
Copper wire
Copper wire is the core part of power line. Copper wire is mainly the carrier of current and voltage. The density of copper wire directly affects the quality of power line. The material of power cord is also an important factor for quality control, and the quantity and flexibility of copper wire are also considered. [1]
Inner sheath
The inner sheath is a layer of material that wraps the cable between the shielding layer and the wire core. It is generally polyvinyl chloride plastic or polyethylene plastic. There are also low smoke halogen-free materials. Use according to the process regulations, so that the insulating layer will not contact with water, air or other objects, so as to avoid moisture and mechanical damage to the insulating layer.