What are the advantages of an ac over a dc in transmitting electric power over a long distance?
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The generation, transmission and distribution is mostly in AC.
Advantages of AC Transmission System
AC Circuit breakers are cheaper than DC Circuit breakers.
The repairing and maintenance of AC sub station is easy and inexpensive than DC Substation.
The Level of AC voltage may be increased or decreased(step up and Step down) transformers.
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