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Homework Help: Transformer Calculations

  1. Sep 29, 2015 #1
    So I was studying on transformer calculations and understand it all pretty well until coming across these questions that I don't really understand. There's about 6 of them but if someone could work out 2 for me so I can understand it and finish it off it would be much appreciated.

    upload_2015-9-29_21-45-48.png upload_2015-9-29_21-45-59.png

    Electrical Specifications: Impedance at 1 kHz
    1 - 2 150 W

    2 - 3 150 W

    1 - 3 600 W

    4 - 5 10 kW

    DC Resistance

    1 - 3 23 W

    4 - 5 400 W

    Rated Power 2 W

    -->This transformer is designed to match impedances 600 W (pins 1-3) to 10 kW (pins 4-5) or 150 W (pins 1-2 or 2-3) to 10 kW (pins 4-5).

    -->Note that you can reverse primary and secondary to match 10 kW (pins 4-5) to either 150 W (pins 1-2 or 2-3) or 600 W (pins 1-3).

    For each of the configurations in Figure 11, calculate the turns ratio NS/NP. Use Equation (6) and the transformer specifications on page 6 to calculate the turns ratios for each combination and provide a formula that gives VS as a function of VP. Enter your results in the table below.


    VS = f(VP):

    Step-up / Step-down:

    My attempt:
    so I'm trying to figure out the turns ratio of each of them and I think you use the formula Rl/Rp=(Ns/Np)^2 where n is the amount of turns and R is the impedance. would the impedance be 600 ohms and 10 k ohms? do I have to consider each part as 1-2, 1-3 and 4-5?

    Last edited: Sep 29, 2015
  2. jcsd
  3. Sep 29, 2015 #2


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    Sorry, but PF is not a homework service.

    If you want to take a stab at solving your problem, we'll provide hints and suggestions, but we don't do your work for you. It's against the Rules.
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