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Sir
Power transformer :- (in generating station)
Alternator terminals side - Delta
HT transmission line side - Star
Why?
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Answer Posted / nagarajan
Example 15mva,220/132kv
Star 220kv here phase voltage =line volatge/1.732=127kv
delta 11kv here phase voltage =line volatge.
Because star side we have neutral ,a.insulation cost less and 127kv insulation is sufficient but in this delta we require 132kv insulation.
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