transformer

PES POLYTHECNIC NAME-ATISH JADHAV BRANCH-E&TC SUBJECT-EEN(ELECTRICAL ENGENEERING) TOPIC NAME- TRANSFORMER SUBJECT TEACHER –SHINDE MISS

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PES POLYTHECNIC

NAME-ATISH JADHAV

BRANCH-E&TCSUBJECT-EEN(ELECTRICAL ENGENEERING)TOPIC NAME- TRANSFORMERSUBJECT TEACHER –SHINDE MISS

TRANSFORMER CIRCUIT DIAGRAM

TransformerA transformer is an electrical device that

transfers energy between two or more circuits through electromagnetic induction.

A varying current in the transformer's primary winding creates a varying magnetic flux in the core and a varying magnetic field impinging on the secondary winding.

This varying magnetic field at the secondary induces a varying electromotive force (emf) or voltage in the secondary winding.

Why the rating of transformer is given in KVA?

1) In Transformer ,there are core losses & copper losses.

2)Core losses depend upon input voltage

3)Copper losses depend upon current flowing through winding

4)Hence total losses depend upon voltage as well as current but not on power factor. Hence transformer is rated in KVA and not in KW

TYPES OF TRANSFORMER

CORE TYPE

SHELL TYPE

BERRY TYPE

CORE TRANSFORMERCIRCUIT DIAGRAM

CORE TRANSFORMER

The core of these type of transformer is built of lamination to form a rectangular frame and provides a single magnetic circuit.

The winding are normally cylindrical in form and both windings are uniformly distributed over two lines of the core.

The metallic lamination is at top yoke.

SHELL TYPECIRCUIT DIAGRAM

SHELL TRANSFORMERIn shell-type transformers the core surrounds

a considerable portion of the windings. The comparison is shown in the figure .

The core of this transformer provides double magnetic circuit.

The windings are normally sand witch type always central limb of the core.

Circuit Difference

Difference Between Core type and Shell type

Core type Shell type

2)The core has only one window

3)Winding surrounds the core

4)This transformer is easy to repair

5)Better cooling

6)Less mechanical protection

7)One path for flux

8)Good efficiency

2)The core has two window

3)Core surrounds the winding

4)It is not easy to repair

5)Cooling not very good

6)Better mechanical protection

7)Two path for flux

8)Loss efficiency

Reference

www.wikipedia.com

www.tecnoblog.com

www.tecmaxpublication.com

www.mashable.com

http://www.wikipedia.com/

http://www.tecnoblog.com/

http://www.tecmaxpublication.com/

http://www.mashable.com/

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transformer

Engineering

type of transformer

shell transformer

rating of transformer

core losses copper losses

shell type circuit diagram

shelltype transformers

secondary winding

sand witch type