The introduction of overhead transmission lines

       The function of overhead transmission lines is to carry electricity. It connects power plants, substations and customers to form transmission and distribution networks. Because it is used to conduct the current of the wire is set up on the tower with insulators and gold, so called overhead line and overhead power line.
　　Overhead line is made up of conductor, insulator, metal appliance, tower and its foundation, lightning conductor and grounding device commonly.
　　The main function of a wire is to carry current. It is the basic part of a wire.
　　Insulators are needed to keep the three phases insulated from each other and from the ground when conducting current.
　　The pole tower is for laying conductors so that there is a certain distance between the conductors and the three phases.
　　Fittings are metal attachments mounted on poles and towers, used to connect wires and insulators, etc.
　　The main function of a lightning conductor is to protect the conductor from lightning.
　　The grounding device connects the lightning conductor to the soil to direct the lightning current underground.
　　Power transmission towers of different shapes are often seen on the roadside. What is the difference between them?
　　Tower according to its different appearance structure shape can be divided into cup type, cat head type, stem type, upper type and so on.
　　Glass tower is usually used for 110 kv and above voltage level transmission lines, especially suitable for heavy ice area or minefield. Cat head tower is also a common type of 110 kv and above voltage level transmission line, its advantage is that it can effectively save line corridor. Stem type tower because of its clear and direct stress, economic and practical, so mainly used for tension-resistant tower and corner tower, is 220 kv and above voltage grade transmission line commonly used tower type.