Power cables are cables used for transmission and distribution of electrical energy. Power cables are often used in urban underground power grids, outgoing lines of power stations, internal power supply for industrial and mining enterprises, and power transmission lines under the sea. In power lines, the proportion of cables is gradually increasing. The power cable is a cable product for transmitting and distributing high-power electric energy in the trunk line of the power system, including various voltage levels of 1-500 KV and above, and various insulated power cables.
Structure 1) Conductor (or conductive core):
Its role is to conduct current. There are solid and stranded points. Materials include copper, aluminum, silver, copper-clad steel, aluminum-clad steel, etc. The main use is copper and aluminum. Copper has much better electrical conductivity than aluminum.
2) Fireproof layer:
Only fire-resistant cables have this structure. Its role is that the cable can withstand a certain period of time in the fire, giving us more time to use electricity for escape.
3) Insulation:
Covered outside the conductor, its function is to isolate the conductor, withstand the corresponding voltage, and prevent current leakage. There are many kinds of insulating materials, some require a small dielectric coefficient to reduce the loss, some require a flame-retardant performance or high temperature resistance, and some require that the cable will not generate or generate smoke or harmful gases when burning, there are The requirements are oil and corrosion resistant, while others require softness.
4) Shield:
Outside the insulating layer, the role of the outer sheath is to limit the electric field and electromagnetic interference.
5) Fill layer:
The function of the filling is mainly to make the cable round and stable in structure, and the filling of some cables also plays a role in blocking water and fire. The main materials are polypropylene ropes, glass fiber ropes, asbestos ropes, and rubbers. There are many types, but one of the main performance requirements is non-hygroscopic material, and of course it cannot conduct electricity.
6) Inner sheath:
The role of the inner sheath is to protect the insulated core from being damaged by the armor or shield.
The inner sheath has several forms such as extruding, winding and longitudinal wrapping. The use of extruded wraps for high demands requires low wrap or wrap formats.
7) Armored layer:
The role of the armor layer is to protect the cable from being damaged by external forces. The most common are steel tape armor and steel wire armor.
There are aluminum tape armor, stainless steel tape armor and so on. The main role of steel strip armor is compression, steel armor is mainly used for tensile. According to the size of the cable, the thickness of the steel strip used for armoring is different. This is stipulated in each cable standard.
8) Outer cover:
The component that protects the outermost layer of the cable.
The main advantage of a small footprint. Generally buried in the soil or laid in the indoor, channel, tunnel, the insulation distance between the lines is small, without poles and towers, covering a small area, basically does not occupy space on the ground.
2 high reliability. Due to the small impact of weather conditions and the surrounding environment, the transmission performance is stable and the reliability is high.
3 Has more favorable conditions for the development of ultra-high pressure and large capacity, such as low temperature, superconducting power cables.
4 large distributed capacitance.
5 less maintenance work.
6 The possibility of electric shock is small.
Structure 1) Conductor (or conductive core):
Its role is to conduct current. There are solid and stranded points. Materials include copper, aluminum, silver, copper-clad steel, aluminum-clad steel, etc. The main use is copper and aluminum. Copper has much better electrical conductivity than aluminum.
2) Fireproof layer:
Only fire-resistant cables have this structure. Its role is that the cable can withstand a certain period of time in the fire, giving us more time to use electricity for escape.
3) Insulation:
Covered outside the conductor, its function is to isolate the conductor, withstand the corresponding voltage, and prevent current leakage. There are many kinds of insulating materials, some require a small dielectric coefficient to reduce the loss, some require a flame-retardant performance or high temperature resistance, and some require that the cable will not generate or generate smoke or harmful gases when burning, there are The requirements are oil and corrosion resistant, while others require softness.
4) Shield:
Outside the insulating layer, the role of the outer sheath is to limit the electric field and electromagnetic interference.
5) Fill layer:
The function of the filling is mainly to make the cable round and stable in structure, and the filling of some cables also plays a role in blocking water and fire. The main materials are polypropylene ropes, glass fiber ropes, asbestos ropes, and rubbers. There are many types, but one of the main performance requirements is non-hygroscopic material, and of course it cannot conduct electricity.
6) Inner sheath:
The role of the inner sheath is to protect the insulated core from being damaged by the armor or shield.
The inner sheath has several forms such as extruding, winding and longitudinal wrapping. The use of extruded wraps for high demands requires low wrap or wrap formats.
7) Armored layer:
The role of the armor layer is to protect the cable from being damaged by external forces. The most common are steel tape armor and steel wire armor.
There are aluminum tape armor, stainless steel tape armor and so on. The main role of steel strip armor is compression, steel armor is mainly used for tensile. According to the size of the cable, the thickness of the steel strip used for armoring is different. This is stipulated in each cable standard.
8) Outer cover:
The component that protects the outermost layer of the cable.
The main advantage of a small footprint. Generally buried in the soil or laid in the indoor, channel, tunnel, the insulation distance between the lines is small, without poles and towers, covering a small area, basically does not occupy space on the ground.
2 high reliability. Due to the small impact of weather conditions and the surrounding environment, the transmission performance is stable and the reliability is high.
3 Has more favorable conditions for the development of ultra-high pressure and large capacity, such as low temperature, superconducting power cables.
4 large distributed capacitance.
5 less maintenance work.
6 The possibility of electric shock is small.
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