1. Transformer Construction
Core form
Shell form

2. Transformer Construction
Core is made up of laminations to reduce the eddy current losses. The thickness of laminations is usually 0.4mm.

3. Transformer Construction

4. Transformer Construction

5. Transformer Construction
Left: Windings shown only on one leg
Right: Note the thin laminations

6. Classification of transformers according to turn ratio:

7. Classification of transformers according to their function:
1- Power transformer
2- Distribution transformer
3- Measuring transformers
A)voltage transformer B) current transformer
4-Autotransformer- Tapped autotransformer

8. Power Transformer
It is a power transformer connected to the output of a generator and used to step its voltage up to the transmission level.
A 1300 MVA, 24.5/345 kV, 60Hz transformer with forced oil and air (fan) cooling.

9. Distribution Transformer
It is a transformer converting the distribution voltage down to the final level.
A 60 MVA, 225/26.4 kV, 60 Hz transformer showing the conservator.

10. Classification of transformers according to number of phases:
1- Single phase transformer
2- Poly phase transformer