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Full load condition of real transformer 
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#1
Aug1714, 11:35 AM

P: 2

What is the full load condition of a transformer.
Then in reference to the equation: Vp = aVs + Req*Ip + jXeq*Ip (the very common complex equation of a simple equivalent circuit ) Should I use Vs= 230 V or Vp = 2300 V in full load load condition or will the magnitude of the primary voltage be greater than 2300 V in full load condition , if it is given that the secondary current is 0.8 power factor(PF) lagging. if so why?? 


#2
Aug1714, 12:26 PM

P: 60

Usually we take VS, Rp, Xp but R’s, X’s and V’L that means the secondary parameters referred to primary. R’s=Rs*np/ns; X’s=Xs*np/ns V’L=VL*np/ns If np/ns=Ep/Es~ Vprated/Vsrated then V’L=VL*Vprated/Vsrated[Vsrated at noload].
The load p.f. it is cos(fi) –fi the angle between VL and Iload. 


#3
Aug1814, 03:06 PM

P: 60

Correction:
R's=Rs*np^2/ns^2; X's=Xs*np^2/ns^2 


#4
Aug1814, 03:09 PM

P: 60

Full load condition of real transformer
If we neglect the upstream voltage drop only the secondary voltage decreases with the load.



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