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Wire and cable commonly used plastics are polyethylene, polyvinyl chloride, cross-linked polyethylene, fluorine plastics, polypropylene, polyolefins, nylon and so on.
Polyethylene is currently the most widely used and largest amount of plastic. According to the data in the table, polyethylene has low meson consumption, high resistivity, high breakdown field strength, good weather resistance, and good processability. It is currently the best. Electrical insulation material. However, due to its low operating temperature, it is mainly used as insulation for communication cables. Medium density and high density polyethylene are high in strength and hardness, and their water permeability is low, and they are mostly used as cable jackets. However, polyethylene has the biggest drawback, that is, it is easy to burn, and the black smoke is strong. Therefore, its application brings many hidden troubles to the environment.
Cross-linked polyethylene is an excellent thermosetting insulation material formed by adding cross-linking agent using low-density polyethylene. It inherits the excellent performance of polyethylene, improves the mechanical properties, weatherability and allowable working temperature, thus becoming the best insulation material for power cables.
Due to the different addition of cross-linking agents, different cross-linking processes are formed. At present, there are three kinds of chemical crosslinking, warm water crosslinking, and radiation crosslinking. Chemical cross-linking is mainly used for medium and high voltage cables (such as 10KV and above); warm water cross-linking and irradiation cross-linking are mainly used for low-voltage cables (1kV and below).
Cross-linked polyethylene's insulation properties are closely related to its purity. The insulation of high-voltage and ultra-high-voltage cables above 35KV shall be ultra-clean cross-linked polyethylene, which not only requires high purity of raw materials, but also requires high cleanliness of the cross-linking process equipment and environment, and the process is stable and reliable.
Polyethylene is currently the most widely used and largest amount of plastic. According to the data in the table, polyethylene has low meson consumption, high resistivity, high breakdown field strength, good weather resistance, and good processability. It is currently the best. Electrical insulation material. However, due to its low operating temperature, it is mainly used as insulation for communication cables. Medium density and high density polyethylene are high in strength and hardness, and their water permeability is low, and they are mostly used as cable jackets. However, polyethylene has the biggest drawback, that is, it is easy to burn, and the black smoke is strong. Therefore, its application brings many hidden troubles to the environment.
Cross-linked polyethylene is an excellent thermosetting insulation material formed by adding cross-linking agent using low-density polyethylene. It inherits the excellent performance of polyethylene, improves the mechanical properties, weatherability and allowable working temperature, thus becoming the best insulation material for power cables.
Due to the different addition of cross-linking agents, different cross-linking processes are formed. At present, there are three kinds of chemical crosslinking, warm water crosslinking, and radiation crosslinking. Chemical cross-linking is mainly used for medium and high voltage cables (such as 10KV and above); warm water cross-linking and irradiation cross-linking are mainly used for low-voltage cables (1kV and below).
Cross-linked polyethylene's insulation properties are closely related to its purity. The insulation of high-voltage and ultra-high-voltage cables above 35KV shall be ultra-clean cross-linked polyethylene, which not only requires high purity of raw materials, but also requires high cleanliness of the cross-linking process equipment and environment, and the process is stable and reliable.
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