江苏春晨电缆有限公司：https://www.ybzhan.cn/st82365/
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Wire and cable commonly used in plastic polyethylene, crosslinked polyethylene, polyvinyl chloride, polypropylene, polyolefin, fluorine plastic, nylon, etc.
Polyethylene plastic is currently the most widely used, the largest amount, from the data in the table shows that loss of small meson polyethylene, high resistivity, high breakdown strength, weatherability, good technology, is currently the best electrical insulating materials. However, due to its low operating temperature, it is mainly used for the insulation of communication cables. The strength and hardness of medium density and high density polyethylene are high, the water permeability is low, and it is used for cable sheath. However, PE has the biggest drawback, that is easy to burn, and strong black smoke, so its application has brought a lot of hidden dangers to the environment.
Crosslinked polyethylene is an excellent thermosetting using low density polyethylene cross-linking agent and the formation of insulating materials. Based on the excellent properties of polyethylene, it improves the mechanical properties, weather resistance and temperature, which is the best insulating material for power cables.
Due to the addition of crosslinking agent, so the formation of different crosslinking process. At present, the most used chemical crosslinking, warm water crosslinking, and irradiation crosslinking three. Chemical crosslinking is mainly used for medium and high voltage cables (such as 10KV and above); warm water crosslinking and irradiation crosslinking are mainly used for low voltage cables (1kV and below).
The insulation properties of crosslinked polyethylene are closely related to its purity. 35KV high voltage and ultra high voltage cable insulation must be used in ultra clean cross-linked polyethylene, not only the requirements of raw materials of high purity, but also requires the crosslinking process equipment and the environment of high degree of cleanliness, stable and reliable technology.
Should be noted that the insulation performance of polyethylene and crosslinked polyethylene has a "quirks", which is suitable for AC and DC insulation for electrical insulation, especially DC high voltage will reduce its insulation life. Therefore, the use of DC cable insulation rubber insulation or insulation. Furthermore, polyethylene and crosslinked polyethylene insulation "hydrophobia", the breakdown is often related to the presence of water, which form a "water tree" in the condition of high voltage and insulation damage caused. Therefore, polyethylene and crosslinked polyethylene insulation for high voltage and ultra high voltage cables, in its processing, storage and insulation extrusion process of special "anti water", and the cable insulation shielding outside the water blocking structure, such as a metal sheath.
Compared with polyethylene, polyvinyl chloride and paper insulation, one of the biggest advantages is that the working temperature is increased by 20 degrees Celsius, which improves the safety of the cable and reduces the cost of the cable. For example, when the same flow line (such as 300A), polyethylene or polyvinyl chloride insulated cables (such as type YV or type VV) copper conductor cross-sectional area 120mm2, and XLPE insulated copper conductor with basketball sectional area only 70mm2 is enough. It shows that the advantages of cross-linked polyethylene insulated cables are remarkable.
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Polyvinyl chloride has good physical and mechanical properties and excellent technical performance, is the largest amount of plastic in twentieth Century, is also the main insulation material and sheath material of low voltage wire and cable. But in twenty-first Century, PVC in the cable market will gradually shrink or fade. There are two reasons for it. One is to improve people's sense of safety, hope to adopt halogen-free materials, so many halogen-free materials came into being, there is no doubt that it will become the new darling of the cable industry in twenty-first Century to occupy the market. On the other hand because PVC has five weaknesses: one is the density, is about 1.5 times of XLPE insulation, and high cost; two is the low working temperature; three is the high dielectric loss, more than and 100 times higher than the crosslinked polyethylene; four is cold tolerance (-15 is brittle; five is burning) burning gas (HCL) released. In recent years the development of crosslinked PVC mechanical properties, electric properties, insulation resistance is greatly improved, some small section cable using irradiation technology to enter the market, in the equipment with wire, high voltage wiring, automotive wire and building wiring has been applied, but it has the disadvantage of being unable to change the halogen.
Because of high operating temperature, low dielectric, and insulation, weather resistance, acid and alkali resistance, oil resistance, good flame retardant and many other advantages, the application of the increasingly wide range of wire and cable. Among them, especially the poly - ethylene propylene due process is a good and popular. But the price is expensive, the user had to think twice.
Low smoke halogen-free polyolefin is a new type of cable sheath material in twentieth Century did not develop, the biggest advantage is that he is flame retardant, and burning smoke, gas, has been widely used in important public buildings.
