Transformer ppt download

explained about transformer

1. PRESENTATION ON
TRANSFORMER
PREPARED BY:
ANKUSH KUMAR (200101120076)
BSIC ELECTRICAL ENGINEERING
(CUTM1057)
CENTURION UNVERSITY OF TECHNOLOGY
AND MANAGEMENT
PARLAKHAMANDI, GAJAPATI
ODISHA

2. INTRODUCTION
oThetransformerisastaticdevicewhichis
usedtotransferelectricalenergyfromone
accircuittoanotheraccircuit.
oInputtoatransformerandoutputfroma
transformerbotharealternatingquantities
(AC).
oElectricalenergyisgeneratedand
transmittedatanextremelyhighvoltages.
Thevoltageistobethenreducedtoa
lowervalueforitsdomesticandindustrial
use.
oThisisdonebyusingatransformer.

3. •Thepowertransmissionsystem
usingtransformersisshownin
figure.
•Whenthetransformerchangesthe
voltagelevel,itchangesthecurrent
levelalso.

4. Basic Principle
•Theprimarywindingisconnectedtothesingle–
phaseacsupply,anaccurrentstartsflowing
throughit.

5. •Theacprimarycurrentproducesan
alternatingflux(Ф)inthecore.
•Mostofthischangingfluxgetslinkedwith
thesecondarywindingthroughthecore.
•Thevaryingfluxwillinducevoltageintothe
secondarywindingaccordingtothe
faraday’slawsofelectromagneticinduction.
•Voltagelevelchangebutfrequencyi.e.time
periodremainssame.
•Thereisnoelectricalcontactbetweenthe
twowinding,anelectricalenergygets
transferredfromprimarytothesecondary.

6. •Asimpletransformerconsistsoftwo
electricalconductorscalledtheprimary
windingandthesecondarywinding.
•Energyiscoupledbetweenthe
windingsbythetimevaryingmagnetic
fluxthatpassesthrough(links)both
primaryandsecondarywindings.

7. Can the transformer operate on DC?
•Answer:NO
•Thetransformeractiondoesnottakeplace
withadirectcurrentofconstant
magnitude.
•BecausewithaDCprimarycurrent,the
fluxproducedinthecoreisnotalternating
butitisofconstantvalue.
•Asthereisnochangeinthefluxlinkage
withthesecondarywinding,theinduced
emfinthesecondaryiszero.

8. •IfDCisappliedtotheprimary
thenthereisapossibilityof
transformercoresaturation.
•Ifcoresaturatestheprimarywill
drawexcessivelylargecurrent.
ThereforeapplicationofDC
shouldbeavoided.

9. Transformer Types
•Thetransformerareofdifferenttypes
dependingonthearrangementofthecore
andthewindingasfollows.
•CoreType
•ShellType
•BerryType
•Themagneticcoreisastackofthin
silicon-steellaminationsabout0.35mm
thickfor50Hztransformer.Inorderto
reducetheeddycurrentlosses,these
laminationsareinsulatedfromoneanother
bythinlayersofvarnish.

10. Core Type Transformer

11. Shell Type Transformer

12. Sr.
N
o
CoreType
Transformer
Shell Type Transformer
1. The core has only
onewindow.
The core has two
windows.
2. Winding encircles
the core.
Core encirclesthe
windings.
3. Cylindrical
windingsare used.
Sandwich type
windingsare used.
4.Easyto repair.It is not so easy to
repair.
5. Better coolingsince
more surface is
exposed to the
atmosphere.
Cooling is not very
effective.

13. Construction of Transformer
•TheMostimportantpartsofatransformer
arethewindings(coils)andthecore.
•Someotherpartssuchassuitabletank,
conservator,bushings,breather,explosion
ventetc.arealsousedalongwiththecore
andwindings.

14. Applications
•Step–upandStep–downVoltage
•Measurementofcurrentinsingleand
threephasesystem
•Measurementofvoltageinsingleand
threephasesystem
•Measurementofpower
•MeasurementofEnergy