Transmitting electricity over AC links is more efficient, compared to DC transmission, up to a certain distance then DC transmission would be more efficient (hence, HVDC technologies are emerging!)
by
Mukul Tyagi , Field Service Engineer , World Wide Power Services
It is easy to maintain and change the voltage of AC electricity for transmission and distribution. Plant cost for AC transmission (circuit breakers, transformers etc.) is much lower than the equivalent DC transmission. ... It is easier to convert AC to DC rather than the other way around.
by
Ajesh Krishna , Electrical Engineer , Kerala State Electricity Board Ltd
1.We all know that we got ac supply in our homes and we got this supply by transmitting ac over long distances. AC can be transmitted using step up transformers but direct current or dc can not be transmitted by this method.
2.The ac is easy to generate than dc.
3.It is cheaper to generate ac than dc.
4.The ac generators have higher efficiency than dc.
5.The loss of energy during transmission is negligible for ac.
6.The ac can be easily converted into dc.
7.The variation of ac can easily be done using transformers either step up or step down.
8.The value or magnitude of ac can be decreased easily without loss of excess of energy. This can be done by using choke coil
HVDC
The advantage of HVDC is the ability to transmit large amounts of power over long distances with lower capital costs and with lower losses than AC. Depending on voltage level and construction details, losses are quoted as about 3% per 1000 km. ... In a number of applications HVDC is more effective than AC transmission.