The saving of copper in an auto-transformer compared to a conventional two-winding transformer with transformation ratio K (V2/V1 < 1) is proportional to:
A1 / K
BK
CK^2
D1 - K
Explanation
The weight of copper in an auto-transformer is (1 – K) times that of a two-winding transformer, meaning the saving in copper is proportional to K.

No Comments