The advantages of high transmission voltage are

A. Area of the cross-section is reduced
B. Reduced line losses
C. Increase efficiency
D. All of the above

Answer: D. All of the above

Explanation:
The line losses are inversely proportional to the square of the voltage and the power factor (Pl∝ 1/V²P). Therefore line losses are reduced.

For constant current density, the line efficiency is high for the high voltage transmission line.

The volume of copper required is inversely proportional to the square of the voltage and the power factor.
 
Hence the requirement of copper is less for the high voltage transmission line.
A ∝ 1/V²

As the line losses are decreased the efficiency of the transmission line is increased.


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