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Loading of transformer

  1. Aug 27, 2005 #1
    dear all,

    When loading the secondary winding of a transformer, my textbook gives the following relationships:
    [tex]\frac{V_{sec}}{V_{pri}}=\frac{N_{sec}}{N_{pri}}\\[/tex]
    and
    [tex]\frac{I_{sec}}{I_{pri}}=\frac{N_{sec}}{N_{pri}}\\[/tex]

    Do these relationships hold also when the diameter of the windings are different?
    I suspect they don´t...If they do not, are there any other relationships I can use to calculate I and V in the secondary winding?


    regards
    t.
     
  2. jcsd
  3. Aug 28, 2005 #2

    berkeman

    User Avatar

    Staff: Mentor

    Those are the simple first-order relationships, and as you suspect, they ignore parasitic inductance, capacitance and resistance, as well as core material issues. I did a quick google search, and pages like this one are pretty common:

    http://www.beigebag.com/case_xfrmer_2.htm

    Depending on lots of stuff, you can make your model a lot more accurate by including at least the leakage inductance and winding resistance (both are in series with the magnetizing inductance), and also the inter-winding capacitance of each winding (put in parallel with the magnetizing inductance of each winding). The N1:N2 transformation only applies to the magnetizing inductance components of this model.

    Hope that helps, -Mike-
     
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