Full load condition of real transformer

  1. 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??
    Last edited: Aug 17, 2014
  2. jcsd
  3. 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 no-load].
    The load p.f. it is cos(fi) –fi the angle between VL and Iload.
  4. Correction:
    R's=Rs*np^2/ns^2; X's=Xs*np^2/ns^2
  5. If we neglect the upstream voltage drop only the secondary voltage decreases with the load.
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