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(i) HVAC transmission: Advantages of HVAC transmission are as follows:
As the voltage is increased, the current carried by the conductors decreases. The i2R
losses correspondingly get reduced. However the cost of transmission towers,
transformers, switches and circuit breakers rapidly increases with increase in voltage,
in the upper ranges of a.c. transmission voltages.
(ii) HVDC transmission:
Advantages They (HVDC lines) are economical for bulk power transmission. The
voltage regulation problem is much less in DC since only IR drop is involved. There
is easy reversibality and controllability of power flow through a DC link. Also there is
considerable insulation economy.
Limitations: The systems are costly since installation of complicated converters and
DC switchgear is expensive. The converters require considerable reactive power.
Lack of HVDC circuit breakers hampers network operation. Moreover there is
nothing like DC transformer; voltage transformation has to be provided on the a.c.
sides of the system.
gregorymasila answered the question on February 20, 2018 at 16:09
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