Aluminum-clad steel strand is a commonly used wire product in the field of power transmission and distribution. The following is a detailed introduction to it:

1. Definition and Structure

Aluminum-clad steel strand is a kind of overhead conductor which is composed of multiple strands of aluminum alloy core and one or more strands of high-strength steel wire. It is usually composed of three parts: a central steel core, an outer aluminum-clad steel core and an outer aluminum stranded wire. The central steel core is responsible for bearing tension and maintaining the distance between the wires. The outer aluminum-clad steel core is a layer of aluminum-wrapped steel core, which can reduce line impedance and improve conductivity and strength. The outer aluminum stranded wire is a wire twisted by multiple strands of thin aluminum wires, which is responsible for transmitting electric energy.

2. features and advantages

Strong corrosion resistance: The surface of the aluminum alloy core of the aluminum-clad steel stranded wire is covered with an alumina protective layer, which can effectively prevent the aluminum core from being oxidized, thereby extending the service life of the wire.
Good heat resistance: The aluminum alloy core of the aluminum-clad steel strand has good high temperature resistance and can maintain stable electrical transmission performance in high temperature environments.
Good conductivity: The aluminum alloy core of the aluminum-clad steel strand has good conductivity and high conductivity.
High tensile strength: the steel core wire of aluminum clad steel strand has the characteristics of high strength, high toughness and good tensile performance, which can effectively enhance the bearing capacity of the wire.
Light weight: Compared with ordinary steel-reinforced aluminum stranded wire, aluminum-clad steel stranded wire is light in weight and easy to erect and maintain.
Low power loss: low power loss of aluminum clad steel strand can reduce energy waste.

3. Application Scenarios

Aluminum-clad steel strand is widely used in electric power, railway, petroleum, chemical, natural gas, ships and other fields, is an ideal transmission cable products. Specifically:

High-voltage transmission: Aluminum-clad steel strand is widely used in the field of high-voltage transmission, which can effectively improve the carrying capacity of transmission lines.
Railway electrification: Aluminum-clad steel strands can meet the power transmission needs of electrified railways.
Petrochemical: Aluminum-clad steel strands can meet the transmission needs of petrochemical companies.
Ship electrification: Aluminum-clad steel strands can meet the power transmission needs of ships.
In addition, aluminum-clad steel strands are also suitable for transmission lines of various voltage levels and transmission lines that require an increase in the cross-sectional ratio of aluminum to steel, as well as transmission lines in coastal areas, salt-alkali beaches and 3. four-level industrial pollution areas.

4. Maintenance and Inspection

In order to ensure the normal operation and prolong the service life of the aluminum clad steel strand, it is necessary to carry out regular maintenance and inspection. Specifically include:

Ventilation and heat dissipation: The aluminum-clad steel strand needs good ventilation to avoid overheating and cannot be installed in a closed place.
Insulation material selection: During the installation process, the insulation material should be selected correctly according to the characteristics of the aluminum-clad steel strand and the temperature, humidity and other factors in the working environment.
Bending radius limit: Note that the conductor cannot be bent too much to avoid damage to the insulating layer. It is necessary to set a suitable bending radius according to different specifications and models of aluminum-clad steel strands.
Prevent electrical contact: ensure the safe use of the wire, avoid the electrical contact of the conductor, the insulation is damaged and the insulation layer is damaged.
Check the surface quality: the surface of aluminum-clad steel strand and single wire should be smooth, and no defects affecting the use, such as fins, oxide scale, sharp edges, blisters, scratches and pinholes, are allowed.
Periodic inspection: It is necessary to regularly inspect and maintain the status of aluminum-clad steel strands, including connectors, joints, conductors, insulation layers, etc., to ensure normal operation.
Maintenance of grounding: grounding is very important, if the aluminum clad steel strand is not grounded, its insulation resistance will be reduced, increasing the risk of leakage.
Pay attention to the service life: The aluminum-clad steel strand has a service life. Excessive service life will cause the wire to age and increase safety hazards. It needs to be replaced or repaired in time.
In summary, aluminum-clad steel strands have many advantages and a wide range of application scenarios, and play an important role in the field of power transmission and distribution. By understanding its definition, structure, characteristics, application scenarios and maintenance and inspection of knowledge, we can better select and use aluminum-clad steel strand, and provide a strong guarantee for the stable operation of the power system.