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(7)Protective Devices & Maintenance

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  Welcome to the Presentation   on   Specifications   Protective devices and   Maintenance Operation & Maintenance of Distribution   Transformers, Prevention of Failures & Repairs   (C&D employees)   (DIST TFS)  WHAT IS A TRANSFORMER?  Transformer is a staticdevice which transformsA.C. Electrical power fromone voltage to anothervoltage keeping thefrequency same byelectromagnetic induction.  Power Transformers  TransformersCapacityInASystem :Generally 6to8timesthe installedcapacity  WorkingPrinciple: Static piece of apparatus used for transferringpower from one circuit to another without changein frequency. It can raise or lower the voltage withacorresponding decreaseorincreaseincurrent.   IdealTransformer : NoLosses  EMF equation ofaTransformer :E1=4.44fN1 ø m E2=4.44fN2 ø m where N1=No. of turns in PrimaryN2=No. of turns in Secondary ø m  = Maximum flux in the core in Webers
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