Structure of Overhead Transmission Line Cable
Overhead transmission line cables are designed to transmit electrical power over long distances while withstanding various environmental conditions. These cables generally consist of several key components:

Conductor: The core of the cable, typically made from materials like aluminum, aluminum alloy, or a combination of aluminum and steel.
Steel Core: Provides strength and allows the cable to bear tension without excessive sagging.
Insulation: In some cases, a layer of insulation may be added, although overhead transmission lines typically rely on the physical separation of wires and the air to avoid short circuits.
Sheath: A protective layer to safeguard the wire from external elements like corrosion or environmental wear.
Stranding: The process of twisting multiple strands of conductor material together, enhancing the flexibility and strength of the cable.
The configuration of these components varies according to the type of cable and its intended use, but all are designed to meet rigorous performance and safety standards.

Types of Overhead Transmission Line Cables
There are several types of overhead transmission line cables, each suited to different environmental conditions, voltage requirements, and application needs:

Aluminum Conductor Steel Reinforced (ACSR)
Material: Aluminum wire and galvanized steel core
Voltage Range: Commonly used for high-voltage transmission lines (up to 110kV and higher)
Application: Suitable for long-distance transmission, where high strength and low weight are necessary. Ideal for overhead transmission lines between major transmission points.
Features: Combines the high conductivity of aluminum with the tensile strength of steel.

Aluminum Conductor Steel Reinforced/Aluminum Wire (ACSR/AW)
Material: Aluminum wire around a zinc-coated steel core
Voltage Range: Suitable for high-voltage applications (typically >154kV)
Application: Used in regions where resistance to corrosion is important, like coastal or industrial areas.
Features: Offers enhanced corrosion resistance and higher tensile strength compared to standard ACSR.

High Strength Super Thermal-Resistant Aluminum Alloy Conductor Aluminum-Clad Invar Reinforced (HSTACIR/AW)
Material: Super-thermal resistant aluminum alloy combined with an invar (zinc-coated) line
Voltage Range: Used in ultra-high voltage transmission systems
Application: Ideal for coastal and other environments where corrosion and electrolytic corrosion (galvanic corrosion) may be a concern.
Features: Exceptional temperature resistance and durability, along with reduced line sag.

Super Thermal-Resistant Aluminum Alloy Conductor Aluminum-Clad Invar Reinforced (STACIR)
Material: Thermal-resistant aluminum alloy with a zinc-plated invar line
Voltage Range: Used where higher current capacity (double the capacity of ACSR) is required without replacing existing steel towers.
Application: Used in power grids where high capacity and resistance to extreme conditions are crucial.
Features: Supports more current with lower cost installation and higher durability.

Thermal-Resistant Aluminum Cables Steel Reinforced (TACSR)
Material: Thermal-resistant aluminum wire wrapped around a zinc-coated steel core
Voltage Range: Suitable for medium to high-voltage applications (150°C operational temperature)
Application: Preferred in high-temperature environments or places with fluctuating weather conditions.
Features: Allows for higher transmission currents, up to 1.6 times the standard ACSR.

Thermal-Resistant Aluminum Cables Steel Reinforced/Aluminum Wire (TACSR/AW)
Material: Thermal-resistant aluminum wire around a zinc-coated aluminum steel core
Voltage Range: Suitable for high-voltage transmission lines and environments requiring high corrosion resistance
Application: Used for lightweight and high-efficiency transmission lines with enhanced lifespan.
Features: Provides improved electrical properties, increased lifespan, and lowered electrical resistance.

Applicable Scenarios
Urban and Suburban Power Grids: Overhead transmission line cables are extensively used in urban areas to supply power to homes, industries, and businesses.
Long-Distance High-Voltage Transmission: Cables like ACSR and TACSR are ideal for transmitting electricity over long distances, where minimal line sag and high tensile strength are crucial.
Coastal and Industrial Areas: Products like ACSR/AW and HSTACIR/AW are often used in coastal areas and industrial settings, where corrosion is a concern due to exposure to saline or harsh chemical environments.
Renewable Energy Projects: Overhead transmission cables like ACSR and STACIR are commonly used in connecting renewable energy generation sources, such as wind or solar power, to the grid.
High Capacity Transmission: In regions requiring high-power transmission without replacing the infrastructure (i.e., steel towers), STACIR provides an ideal solution by offering up to double the current capacity of ACSR.

To meet the diverse demands of the global market, we offer tailored solutions for each type of overhead transmission line cable. If you need more details on specific products or have any inquiries, feel free to reach out for a personalized consultation. Get a free quote by E-mail：info@cable-uni.com