Nowadays people's life is inseparable from power, and the transmission and distribution of electric energy is inseparable from power cables. So power cables should not be strange to us. Do you know what its structure is like? Next, let's tell you from Hebei power cable manufacturer.
1) conductor (or wire core)
Its role is to conduct current, with solid core and stranding. Materials are copper, aluminum, silver, copper clad steel, aluminum clad steel, etc., mainly using copper and aluminum. The electrical conductivity of copper is much better than that of aluminum.
2) refractory layer
Only the fire resistant cable has this structure. Its role is that in the fire, the cable can withstand a certain period of time and give more time for electricity to escape.
3) insulation layer
Wrapped outside the conductor, its role is to isolate the conductor, withstand the corresponding voltage, prevent leakage of current. There are many kinds of insulating materials. Some require small dielectric coefficient to reduce the loss. Some require flame retardancy or high temperature. Some require that the cable will not produce heavy smoke or harmful gas flame retardancy or high temperature when burning, and some require that the cable will not produce heavy smoke or harmful gas when burning.
4) shield layer
Outside the insulation layer, the outer sheath is restricted by electric field and electromagnetic interference. For different types of cable, shielding materials are also different, mainly: copper wire woven, copper wire winding aluminum wire (aluminum alloy wire) weaving, copper belt, aluminum foil, aluminum (steel) plastic belt, steel belt and other wrapping or longitudinal package and so on.
5) fill layer
The main function of filling is to make the cables round and stable, and some cable fillers also play the role of water blocking and fire resistance. The main materials are polypropylene rope, glass fiber rope, asbestos rope, rubber, and so on. There are many kinds, but there is a main performance requirement that is non - hygroscopic material, and of course it can't be conductive.
6) inner protective layer
The function of inner sheath is to protect the insulated core from damage by armour or shield. The inner sheath has several forms, such as extrusion, wrapping and longitudinal packing. For high requirements, the form of crowding bag is adopted, requiring low wrapping or longitudinal wrapping.
7) armored layer
The role of armor layer is to protect cables from damage by external forces. The most common are steel belt armour and steel wire armour, and aluminum tape armour, stainless steel belt armour and so on. The main role of steel tape armour is to resist compression, and steel wire armour is mainly used for tensile strength. Depending on the size of the cable, the thickness of the steel strip used for armour is different, which is stipulated in the cable standards.
The above is the introduction of the structural unit of the power cable. Do you understand? If you want to know more about the content, you can come directly to our company's official website to consult our Hebei power cable manufacturer.
Key words: Hebei electric power cable