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AC is very easy to Maintain and it can be easily distributed at long distances with the less cost and less power loss . its maintenance and plant has very low cost as compared to DC .
The most important factor is that AC can be easily converted into DC by using a Rectifier . but Conversion of DC is very difficult ----->> the use of Inverters .
Durig a fault natural current zero tends to occur in AC so it can be easily interrupt
Transmission loss very less in high voltage transmission and equipment cost required for transmission less in AC copared to DC
In AC Step Up and Step down easily done by using Transformer
AC fluctuating and if we get any shock it is less harmful than the DC system
There are several reasons to justify the statement.
1) The Major advantage that AC has over DC is that AC voltages can be easily transformed to higher or lower voltage levels, while it is difficult to do in case of DC voltages. Since high voltages are more efficient in sending voltages at greater distances in transmission thus AC has a clear advantage over DC in this regard.
2) Plant cost if AC Voltage operated (Circuit Breakers, Relays and Transformers etc) is much lower than its equivalent DC voltages.
3) In Power Stations, AC is produced so it is better to use AC than DC instead of converting it as it is more cose effective.
4) The most important factor is that AC can be easily converted into DC when needed by using a Rectifier but Conversion of DC is very difficult and costly i.e: using the Inverters.
5) When largers faults occur in a electrical network, it is easier to interrupt in an AC system as the SINE wave current will naturally tend to zero at some point making it easier to interrupt instantly.
Because AC is easy and cheap to transform from one voltage to another using transformers. High voltage means less amperage for the same power, meaning you can do with thinner wires.
With AC, it's easier and cheaper to transform 400kV from transmission lines into the 110 or 220V that you can use at home.
Semiconductors that are now available and are similar to switching power supplies -
DC can be converted more economically. So high voltage DC transmission lines are now becoming more popular. DC has the advantage that you have no losses due to EM radiation. So the old rules are changing due to technology.
in one word AC is Preferred over Dc due to its "Conversion flexibility from one voltage level to other"
AC systems are preferred over DC systems : it is easy to maintain and changes the voltage of AC power for transmission and distribution.
- Plant cost of AC transmission( circuit breakers, transformers etc) much lower than equivalent DC transmission.
Well there are some diffrences such as it is easy to convert ac system to DC and it is less in cost rather than DC system. DC power is quite dangerous than AC so company preffered AC systems more.