advantage of A.C. transmission system
- it is possible to generate high voltage as high as 33 kv as compared to 11 kv in D.C. system
- the alternating voltage can efficienctly be stepped up by transformer which is not possible in D.C. system although in D.C. high voltage can be optained by thury system which is now obsolute
- the lowering of the voltage at sub-station is easier and cheaper as compared to D.C. system using motor generator sets or rectifiers
- the transforming sub-stations are much efficient than motor generator sets used in D.C. system
- the maintenance of A.C. sub-station is easier and is cheaper
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