|Electrical Machines - Basic vocational knowledge (Institut für Berufliche Entwicklung, 144 p.)|
|8.3. Three-phase transformer|
Core transformers are most frequently constructed.
An input and an output coil each have been positioned on the common limb. Following three-phase mains connection the three input coils along with three-phase consumers, can be linked up into a star (Y) or delta (D) connection.
Figure 137 - Three-phase transformer in Yy circuitry
1 Upper voltage winding
2 Under voltage winding