Which of the following is NOT one of the economic advantages of an HVDC transmission system when compared to an AC transmission system?
1
The HVDC lines can be built in one go, i.e. in a single stage, while the HVAC can be built in two stages.
2
The supporting structure required for an HVDC transmission system is narrow, whereas an AC transmission system requires a lattice structure.
3
Line losses in HVDC transmission are less when compared to AC transmission for the same power transfer capacity.
4
It requires only one pair conductor when compared to AC system, which requires several conductors.