Transformer types

A-According to transformed voltage level:

·        Step up transformer

·        Step down transformers

B-According to construction:see fig.1

·        Core type

·        Shell type

fig.1:Core and Shell types

C-According to application

·        Power transformers

·        Distribution transformers

·        Instruments transformers

·        Rectifier transformers

·        Earthing transformers

·        Pole mounted transformer:see fig.2

·        Furnace transformer

·        Regulating transformer (Auto transformer)

·        Isolation Transformers

fig.2:Pole mounted transformer

D-According to insulation and cooling materials

- Oil immersed transformers: see fig.3

- Askral transformers

- Silicon fluid transformers

- Dry type transformers:

-Normal type

-Cast Risen type

-Gas filled type

fig.3:Oil immersed transformers

E-According to number of phases

·        Single phase

·        Three phase

F-According to windings connection methods:see fig.4

·        Star-Star

·        Delta-Delta

·        Star-Delta

·        Delta-Star

·        3-Windings Star-Delta-Star

·        Scott Transformers

·        Zig-Zag Transformers

·        Tap-Changing Transformers

fig.4:windings connection methods

      G-K-factor transformer