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Calculating Transformer Input Voltage?

  1. Feb 12, 2013 #1
    1. The problem statement, all variables and given/known data
    A 2400/240-V, 60-Hz transformer has the following parameters in the equivalent circuit of Figure 6.5: the high-side leakage impedance is (1.2+j2.0)Ω, the low-side leakage impedance is (0.012+j.02)Ω, and Xm at the high-side is 1800 . Neglect Rhe. Calculate the input voltage if the output voltage is 240 V (rms) and supplying a load of 1.5 at a power factor of 0.9 (lagging).



    3. The attempt at a solution
    No idea how to begin.
     
  2. jcsd
  3. Feb 12, 2013 #2

    rude man

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    Draw up your equivalent circuit and solve for Vin.

    While you're at it, is Xm = 1800 in ohms or henrys? And what about " .. a load of 1.5 ..."? Units of 1.5?
     
  4. Feb 12, 2013 #3
    The load is 1.5Ω, and Xm is also in Ω.
     
  5. Feb 12, 2013 #4

    rude man

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    Show us your equivalent circuit?

    1.5 ohms is a very large load. You sure about it? If so, what component do you need to add to the load resistor to make the total impedance 1.5 ohms? (Or, what component needs to be added to the 1.5 ohm resistive load? I'm not sure which is the case here).
     
    Last edited: Feb 12, 2013
  6. Feb 12, 2013 #5

    berkeman

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    Staff: Mentor

    It is not a valid schoolwork thread starter to show zero work in your OP. Please check your PMs, and then show some effort in this thread where you are receiving hints & help...
     
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