【Information summary】The so-called overhead line is relative to the cable, that is, the tower will be set up in a certain height of the wire transmission power line. The ground insulation of overhead lines in high-voltage transmission and distribution networks is generally based on air. The previous distribution lines (10kV except 380V) also generally use bare wires. However, due to the complex distribution environment in urban areas, short-circuit grounding and lightning strike lines often occur, resulting in reduced power supply reliability. Therefore, currently overhead lines below 10kV generally use insulated wires (I .e. the outer layer of the wires is wrapped with insulation), which is the so-called insulated overhead lines.
Overhead cables are: single-layer or multi-layer aluminum strands stranded on the above extruded insulation of the wire.
The so-called overhead line is relative to the cable, that is, the tower will be set up in a certain height of the wire transmission power line. The ground insulation of overhead lines in high-voltage transmission and distribution networks is generally based on air. The previous distribution lines (10kV except 380V) also generally use bare wires. However, due to the complex distribution environment in urban areas, short-circuit grounding and lightning strike lines often occur, resulting in reduced power supply reliability. Therefore, currently overhead lines below 10kV generally use insulated wires (I .e. the outer layer of the wires is wrapped with insulation), which is the so-called insulated overhead lines.
Steel-core aluminum stranded wire is: a single-layer or multi-layer aluminum strand stranded outside the galvanized steel core wire to strengthen the wire.
Steel core aluminum stranded wire is made of aluminum wire and steel wire stranded, suitable for overhead transmission lines. Inside it is a steel "core", and the outside is wound around the steel core with aluminum wire through stranding; the steel core mainly plays the role of increasing strength, and the aluminum stranded wire mainly plays the role of transmitting electric energy. Steel core aluminum stranded wire has simple structure, convenient erection and maintenance, low line cost, large transmission capacity, and is conducive to laying across rivers and valleys and other geographical conditions, has good electrical conductivity and sufficient mechanical strength, high tensile strength, The tower pole distance can be enlarged. Therefore, it is widely used in overhead transmission and distribution lines of various voltage levels.
