A Seminar presentationon

Transformerspresented by

V.vinay under the esteemed guidance of

Mr. M.Mani kumar M.Tech,p.hd.,Professor

DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING

ANNAMACHARYA INSTITUTE OF TECHNOLOGY AND SCIENCES

(AUTONOMOUS) NEW BOYANA PALLI, RAJAMPET – 516 126

2016-2019

Contents: Introduction What is Transformer Working principle Types of transformers Ideal and practical transformer Applications of transformers

INTRODUCTION One of greatest advantage of alternating

current over direct current the alternating currents can be easily transferable from lowest voltage to high or high voltage to low voltage. . Alternating voltage can be raised or lowered as per requirements in the different stages of electrical network as Generation ,transmission, distribution and utilization. This is possible with a device is called as transformer.

WHAT IS TRANSFORMERTransformer is a static device which transfers the

electrical power or energy from one alternating current circuit to another with desired change in voltage or current and Without any change in the frequency.

A transformer used to increase the voltage is called step up transformer .while that used to decrease the voltage is called a step down transformer.

Working principle of transformer A transformer works on the principle of electromagnetic induction

and mutual induction It consist of two windings electrically separated but linked by a common magnetic circuit of low reactance formed by a laminated soft iron core .

TYPES OF TRANSFORMERS According to no. of phases: a) single phase transformer b) three phase transformerAccording to Construction : a) core type b) Shell type c) berry typeAccording to function : a) power transformer i) step up transformer ii) step down transformer b) Distribution transformers

Single phase transformer

Three phase transformer

core type and shell type transformer:

IDEAL VS PRACTICAL TRANSFORMER A transformer is said to be ideal if satisfies the

following properties , It has no losses.Winding resistance has zero.There is no flux leakage.Efficiency is 100 %. But in practical ,there are some losses in

transformer.

Losses in transformerCopper lossesCore or iron losses

I. Hysteresis lossesII. Eddy current losses

APPLICATIONS:Irrigation purposeElectronic devicesDomestic purposeIndoor/ outdoor Sub stations

REFERNCESElectrical engineering by UA Bakshi.Principal of electrical machine by VK Mehta.Electrical machine by R.K.Rajput.www.allabout circuits.comwww.ieee.com