Transformer construction, working principle

1. Presented by
Er.M.Arunkumar
Ranganathan Engineering college

2. TRANSFORMERS

3. Principle
•A transformer consists of two electrically isolated
coils and operates on Faraday's principle of “mutual
induction”,
•An EMF is induced in the transformers secondary coil
by the magnetic flux generated by the voltages and
currents flowing in the primary coil winding.
• Transfers electric power from one circuit to another
• It does so without a change of frequency

4. CLASSIFICATION OF
TRANSFORMER
(I).CONSTRUCTION
1. Core type
2.Shell type
3.Berry type
(II).OUTPUT VOLTAGE
1.step up transformer
2.step down transformer
3. auto transformer
(III).INPUT SUPPLY
1.single phase transformer
2.three phase transformer

5. (IV).COOLING
1.dry type transformer (air natural or air blast)
2.oil immersed transformer
PRINCIPLE OF OPERATION
• Transformer works on the principle of mutual induction of
two coils.
• When current in the primary coil is changed the flux linked to
the secondary coil also changes.

6. • Electromagnetic induction produces an electromotive force
within a conductor which is exposed to time varying magnetic
fields.

7. CORE TYPE TRANSFORMER
• In This Type Transformer Has Both Side Winding Of
The Core. Which Means It Has Both Arm Winding.
• In Larger Machine,We Used Of Core Type Transformer.
• It Have Two Limbs.
• It Is Used For Low Voltage Transformer
.
SHELL TYPE TRANFORMER
• In this type transformer winding installed in mid arm of the core.
Simply it is installed in mid-point of the core.
• In small machine, we need of shell type transformer.
• It have three limbs
• It is used for high voltage transformer.

8. BERRY TYPE TRANSFORMER
• Berry type transformer are similar to Shell type, only they have
a distributed magnetic circuit.
• This core construction is similar to spokes of wheel.
• The number of magnetic flux path is more than 2.

9. BERRY TYPE TRANSFORMER

10. Thank you…