Characteristics and manufacturing requirements of power cables of Zhengzhou first cable Co., Ltd. of Zhengzhou Cable Co., Ltd

  　　  Characteristics and manufacturing requirements of power cables of Zhengzhou first cable Co
, Ltd
Power cable is the cable used to transmit or distribute high-power electric energy in the power system
The electric energy generated by the power station is connected to the substation and distribution station of various voltage levels through overhead transmission lines and power cables, and then sent to each power consumption unit
Compared with other overhead bare wires, power cables have the advantages of less interference from the external climate, safety and reliability, concealment, less maintenance and durability
They can be laid in various occasions
However, the structure and production process of power cables are complex and the cost is high
Therefore, they are generally used in the power incoming or outgoing lines of power plants, substations and industrial and mining enterprises, as well as the transmission and distribution lines across rivers, railway stations and urban areas and the main power lines within industrial and mining enterprises China's power cable industry developed after the founding of new China
At present, it can not only produce cables of various specifications, but also raise the voltage level from low and medium voltage level to high voltage level above 500kV
The number of manufacturers has also increased from a few in the early days of liberation to hundreds
Domestic large-scale power stations and important transmission and distribution lines mostly use domestic power cables
At present, large-scale enterprises producing power cables mainly include Shenyang cable factory, Shanghai Cable Factory, Zhengzhou Cable Factory, Kunming Cable Factory, Chengdu cable factory, Tianjin Cable Factory, etc
China also exports a large number of power cables of various models and specifications every year, mainly to India, Iraq, Iran, Pakistan, Kuwait, Thailand, Qatar, the United Arab Emirates, the Philippines, Egypt, Australia, Canada and other countries 　　1
Type Power cables are divided into several varieties according to their application scope, structural characteristics, performance requirements and other main characteristics
Each variety is divided into different specifications according to the size of conductor core section (or conductor diameter), number of cores, insulating material, protective layer material and voltage level
There are mainly oil immersed paper insulated lead wrapped power cables, rubber insulated power cables, PVC insulated and PVC sheathed power cables, self contained oil filled cables, etc 　　2
Manufacturing process The whole manufacturing process of power cables from raw material processing to manufacturing is different due to different varieties
Generally, there are the following processes: metal processing (smelting) → Calendering & rarr; Threading & rarr; Stranded wire (several copper wires or aluminum wires are twisted into one core) → Core insulation (for rubber insulated and polyethylene insulated cables, the insulated core is completed through extruder and vulcanization pipe; for paper insulated cables, the insulated core is wrapped with insulating paper, vacuum dried and soaked in oil) → Cabling (twisting three or four insulated cores into multi-core cable conductors) → Inside Outer sheath treatment (there are several cases of armored cable, unarmoured cable and paper power cable: the armored cable shall be wrapped or extruded with an inner sheath on the cable conductor after the cable is formed, and then the steel belt or steel wire armor sleeve shall be applied, and then the outer sheath shall be extruded
The unarmoured cable shall be directly extruded with the outer sheath on the cable conductor after the cable is formed
The paper power cable is to wrap the cable conductor after the cable is formed with insulating paper, then press lead, and then wrap it with hemp and asphalt into the outer sheath or extruded with polyvinyl chloride Outer sheath)