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Utilities Business Review | Tuesday, December 17, 2024
The substance used to create the conductor for the transmission line significantly impacts the line's price and lifespan.
FREMONT, CA: The transmission line is an important power system component. The substance used to create the conductor for the transmission line significantly impacts the line's price and lifespan. Copper is the most important and ideal material for transmission line conductors due to its high conductivity and strong tensile strength. Furthermore, it has high flexibility. The price is the only restriction. Aluminum is the material that is utilized most frequently in transmission lines.
Aluminum has adequate conductivity. Furthermore, it is lightweight. This causes less sag and a reduced conductor weight. However, its poor tensile strength is its sole drawback. Therefore, aluminum conductors with steel cores, such as ACSR (Aluminum Conductor Steel Reinforced) conductors, are utilized to increase the tensile strength of the conductor to get around this restriction.
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Materials Use for Transmission Lines
- Copper (Cu)
Copper is the highly conductive substance utilized most frequently as a conductor for electrical machinery or equipment. The most important characteristics of copper are malleability, weldability, and solderability. Copper has excellent conductivity when it is pure. But because of impurities, normal-grade copper has less conductivity.
- Aluminum (Al)
Aluminum is a metallic element viz silver-white, soft, lightweight, pliable, and non-magnetic. Following oxygen and silicon, aluminum is the third leading common element and the most common metal in the planet's crust. Bauxite is the main resource of aluminum. Aluminum is an ideal material to utilize as an electric conductor for electricity distribution and transmission because of its low density, high flexibility, superior corrosion resistance, and good conductivity.
- Cadmium Copper Alloy
Cadmium content extent from 0.6 to 1.2% in the cadmium copper alloys. Due to this little cadmium addition, copper has greater tensile strength and corrosion resistance. In addition, cadmium copper alloys have conductivities between 90 and 96% of that of pure copper.
- Phosphor Bronze
A copper alloy with 3.5 to 10% tin and up to 1% phosphorus is named phosphor bronze("Phos-Bronze"). During melting, phosphorus is introduced as a deoxidizing agent. Phosphor bronze has tiny grains, a minimum coefficient of friction, and high strength and hardness. The inclusion of phosphorous increases the molten metal's fluidity, improving the alloy's ability to be cast and cleaning up the grain boundaries, improving the metal's mechanical qualities.
- Steel Core Copper
It is also called a steel conductor with a copper coating sometimes. Steel is used as the conductor's core for applications requiring great tensile strength, while copper is added to boost the conductivity of the conductor. Here, copper is a protective coating that prevents the steel from rusting due to atmospheric weather conditions and provides conductivity.
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