1. CONSTRUCTION of TRANSFORMERS

2. Construction of Transformers
In order to approach the characteristics of an ideal transformer the following design features are used,
Core is made up of thin sheet of silicon steel laminations
to reduce eddy current loss and hysteresis loss
2. One half of each winding on one limb to ensure tight coupling, structural symmetry
3. Windings are made up off usually copper wires, and winding resistance must be less

3. Construction of Transformers
Depending upon the manner in which primary and secondary are wound on the core transformers are two types
Core type transformer
Shell type transformer

4. Construction of Transformers
Core type transformer
Half of each winding in one limb and other half on other limb
LV wound below the HV to reduce insulation and mechanical consideration
core is surrounding by winding

5. Construction of Transformers
Core type transformer
L shaped strips are used

6. Construction of Transformers
Core type transformer
L shaped strips are used

7. Construction of Transformers
Core type transformer
L shaped strips are used

8. Construction of Transformers
Shell type transformer
Both windings are wound in central limb
LV wound below the HV to reduce insulation and mechanical consideration and it also near the core
Winding is surrounding by core
E or F shaped strips are used

9. Construction of Transformers
Shell typetransformer
Both windings are wound in central limb
E or F shaped strips are used

10. Construction of Transformers
Shell transformer
Both windings are wound in central limb
E or F shaped strips are used

11. Construction of Transformers
Depending upon the manner in which primary and secondary are wound on the core transformers are two types
Core type transformer used high voltage
Shell type transformer used low voltage