Purpose and composition of insulated electrical wires

　　Insulated wires play a vital role in the transmission and distribution of electricity. Its main purpose includes the transmission of electricity from the power plant to the various power units, as well as the transmission lines to further distribute the electricity transmitted to the various end-users, to ensure the safe and stable transmission of electricity. Insulated wires can effectively isolate the electric current and reduce the contact between the wires and the external environment, thus preventing the occurrence of accidents such as leakage, short circuit and electric shock and ensuring the safety of power transmission.

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　　The composition of insulated wire mainly includes the following parts:

　　Conductor: The conductor is the electrically conductive part of the wire and cable, which is used to transmit electrical energy. Usually made of copper or aluminum and other metal materials with good electrical conductivity to ensure the stable transmission of electric current.

　　Insulation: the insulation layer is the conductor and the earth and different phases of the conductor between the electrical isolation of each other's part, to ensure the transmission of electrical energy. It is usually made of non-conductive materials, such as resin, plastic, silicone rubber, PVC, etc., to prevent current leakage or interference from the external environment.

　　Shielding layer: 15KV and above wire and cable generally have conductor shielding layer and insulation shielding layer. These shielding layers are used to reduce electromagnetic interference and electric field strength, and improve the performance and safety of wire and cable.

　　Protective layer: the role of the protective layer is to protect the wire and cable from external impurities and moisture intrusion, as well as to prevent direct damage to power cables from external forces. It is usually made of a tough outer layer made of metal or rubber to ensure the durability and reliability of the wire and cable.

　　In short, insulated wire has a wide range of applications in the field of power transmission and distribution, and its composition ensures the safe and stable transmission of electricity. With the continuous development of power technology, the performance and quality of insulated wires are constantly improving to meet various complex and demanding power transmission needs.

　　Translated with DeepL.com (free version)