Friday, 7 February 2014

Transformer -1

principle of transformer operation........................


A transformer is a static device which consist of two or more stationary electric circuits interlinked by a common magnetic circuit for purpose of transferring electricity between them. the transfer of energy from one end to another end without change in frequency .


consider tow coil 1 and 2 simple on a magnetic circuit as shown in figure these two coil are  insulated each other and there is no electrical connection  between them let t1 and t2 be the number of turns of the coil 1 and 2. when a source of alternating voltage is applied in coil 1 and alternating current {I} gets starts flowing in it this alternating current produce a alternating flux in a magnetic circuit shown in diagram




the alternating flux links with coil 1 and induced in a alternating voltage E1 by self induction
let us make the following simplifying assumption 





(a) three are no losses  either in electrical feild or in magnetic feild
(b)the whole magnetic flux confined to the magnetic circuit so that no leakage flux 
(c) the permeability of the core is infinite




all the flux produce that also links with coil 2 and t2 turns  and induced in them a voltage E2 by mutual induction...coil 2 is connected to the load then ac current flows through itand energy will deliveed to load thus, electrical energy is transferred from coil 1 and2 by a common magnetic circuit .since there is no relative motion between the coil the frequency of the induced voltage in coil 2 is same as the frequency induced in  coil 1                                 





coil one which receives energy source from ac supply from primary coil. coil two is connected to load and deliver energy  top the load called secondary coil..