Why Use Twisted Steel Strands in High Voltage Transmission Lines?

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Twisted steel strands are used in high voltage transmission lines for their superior flexibility compared to solid wires, making them easier to handle during installation and maintenance. The combination of steel and aluminum in the cable design leverages steel's strength and aluminum's excellent conductivity. Stranded cables are less prone to fracture, enhancing their durability in demanding environments. This construction method allows for efficient winding and unwinding on drums, which is crucial for transport and deployment. Overall, the use of twisted steel strands significantly improves the performance and reliability of high voltage transmission lines.
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Modern high voltage electrical transmission lines (400kV) may be constructed with cable having a core of twisted steel strands surrounded by layers of twisted aluminium strands?


What advantage is gained by using strands of steel rather than a single wire of equivalent total cross section?
 
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Stranded cables are more flexible than solid.

How would you wind a solid cable of that thickness on and off a drum?
 
Steel for its strength, Aluminium for it's conductivity.

Stranded steel less prone to fracture as well as easier to handle.
 

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