Which of the following is used in high voltage transmission materials?

Option 2 : Aluminium

The correct answer is option 2 i.e., Aluminium .

• Aluminium or Copper is used in High Voltage transmission due to its easier availability and low cost.
• The copper is the most important and much suitable material for the conductor of transmission line due to its high conductivity and high tensile strength.
• Aluminium is having low tensile strength but it has sufficient conductivity and it is light in weight due to which Aluminium is most extensively used material in the transmission line.
• Transmission line depends upon–
  • Required electrical properties
  • Required mechanical strength
  • Local conditions
  • Cost of material
• Required Properties of the Conductor in Transmission Line-
  • High conductivity
  • High tensile strength
  • Light-weight
  • High resistance to corrosion in whether conditions
  • High thermal stability
  • Low coefficient of thermal expansion
  • Low cost