Transformers-presentation summary of basic transformers.

Basic theory of transformer

2. WHAT IS A TRANSFORMER?

3. WHAT IS A TRANSFORMER?
Atransformerisastaticmachineused
fortransformingpowerfromonecircuit
toanotherwithoutchangingfrequency.

4. MAJOR COMPONENTS OF
TRANSFORMER

Housing

Winding

Core

Insulation Material

Cooling Medium

5. WINDING

There are two types of windings in a
transformer.
a). Primary Winding
b). Secondary Winding
•
The source side is called Primary
•
The load side is called Secondary

6. WINDING
Primary
winding
Secondary
winding

7. Core

Core is used to provide a path for magnetic
field in the transformer.
Core

8. Insulation Material
•InsulationMaterialisusedtoprovide
insulationamongthelivepartitselfand
otherpartsofthetransformertoavoidany
shortcircuitconditionsintransformer.

9. Cooling Medium

Different types of cooling medium are used
in transformers such as mineral oil, Air etc.

The cooling medium requirement of WAPDA
is ONAN(Oil Natural Air Natural).

Whole transformer active part is dipped in oil
which is filled in tank with elliptical tubes.

10. CONSTRUCTION OF SIMPLE
TRANSFORMER

11. 3-Transformer Construction

12. TRANSFORMER ACTIVE PART

13. CLASSIFICATION OF
TRANSFORMERS

Transformers can be classified as
a). Based on type of construction
i). Core Type
ii). Shell Type
b). Based on Voltage Transformation
i). Step Up
ii). Step Down

14. CLASSIFICATION OF
TRANSFORMERS

Transformers are further classified as
i). Distribution Transformers
ii). Power Transformers

15. CORE & SHELL TYPE
TRANSFORMERS

16. STEP UP & STEP DOWN
TRANSFORMERS

Atransformerwhichstepsupthe
voltageiscalledstepuptransformer.In
thistransformersourcevoltageisless
thantheoutputvoltage.

Atransformerwhichstepsdownthe
voltageiscalledstepdowntransformer.
Inthistransformersourcevoltageis
greaterthanoutputvoltage

17. Power & Distribution
Transformers

Thetransformersusedinsub-stations;
gridstationsandfortransmissionof
electricityarecalledpowertransformers.
TheirratingisexpressedinMVA.They
maybestepuporstepdown
transformer.

Thetransformerwhichisusedfor
distributionofelectricityknownas
DistributionTransformers.TheirRating
isexpressassKVA.Theyarealways
stepdownTransformers