Advantages on Using High Voltage for AC Transmission

Advantages of High Transmission Voltage:

• Reduce the volume of conductor material.
• Reduce the transmission conductor cost.
• Decreases the percentage line drop.
• Increase the transmission efficiency.

(i) Reduces volume of conductor material: Consider the transmission of electric power by a three-phase line.

It is clear from exp. (i) that for given values of P,l,ρ and W, the volume of conductor material required is inversely proportional to the square of transmission voltage and power factor. In other words, the greater the transmission voltage, the lesser is the conductor material required.

(ii) Increases transmission efficiency

As J, ρ and l are constants, therefore, transmission efficiency increases when the line voltage is increased.

(iii) Decreases percentage line drop:

As J, ρ and l are constants, therefore, percentage line drop decreases when the transmission voltage increases.