Tuesday, 27 February 2018

All About Detail Of Ideal Transformers And Auto Transformers !!

All About Detail Of Ideal Transformers And Auto Transformers !!



Detail About Ideal Transformer 




An Ideal Transformer is one which has no losses and magnetic leakage.






An Ideal Transformer has no ohmic resistance in the windings and no leakage flux. 


  • Efficiency will be 100 and voltage regulation is zero.

 In other words, an Ideal Transformer consists of two purly inductive coils wound on a loss-free core. But in actual practice, it is impossible to obtain such an ideal transformer.

Question part on ideal transformer :

1) state the ideal transformer??? 
Ans:An ideal transformer is one which has no losses and magnetic leakage. An ideal transformer has no ohmic resistance in the windings and no leakage flux. 

2)what is efficiency of ideal transformer??? 
Ans:100%

3)how many voltage regulation in Ideal transformer?? 
Ans:Zero

4)the ideal transformer consists two purly ______   coil?? 
Ans: inductive


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Detail About Auto Transformers 


Description 



The Auto Auto-transformer works on the principle of self induction.The auto- transformer differs from a two winding transformer in a way in which the primary and secondary are inter-related.

An auto-transformer is special Type Of Transformer having a single winding of insulated copper wire such that the part of the winding is common to the Primary And Secondary i e. that serves as both primary and secondary


(A) 

In Auto-Transformer, the single winding of an insulated copper wire is wound on a laminated core of slicon steel and therefore both primary and secondary sections of this winding are on the same Magnetic Circuit. An auto-transformer may step-up or step down the voltage.

(B) 

and (b) shows the step down and step-up auto-transformers respectively Referring Fig. (a), one end of the winding (C) is Common To Primary as well as secondary, while other two ends A and B form the other terminals of primary and secondary
respectively. Thus AC forms the primary winding with N1 turns and BC forms the Secondary Winding with N2 turns. As N2 N1, the secondary voltage V2 vi and therefore it acts as a step down auto-transformer Referring to fig. (b),


the whole winding (AC) acts as while the part of the winding is common to both primary and secondary Thus forms Secondary Winding with N2 turns and BC forms the primary winding with NI turns. As N2 N, the secondary voltage Va Vi and therefore it acts as a step up auto-transformer. Under ideal conditions (An auto-transformer which has no losses and magnetic leakage), the transformation ratio of an Auto-Transformer given by

k=(V2/V1)=(N2/N1)=(I1/I2)
If k>1 then the auto transformer is called step-up and if k<1 then the auto transformer is called step down.

Question part of auto transformer  :

1) The Auto Auto-transformer works on the principle of ______???
Ans: self induction

2) in the auto transformer how many winding???
Ans: one

3)what is the transformation ratio of an auto-transformer ????
Ans: k=(V2/V1)=(N2/N1)=(I1/I2)



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