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Ideal Step-up transformer

  1. Apr 18, 2015 #1
    1. The problem statement, all variables and given/known data
    An 5kVA ideal step-up transformer having a turns ratio of 200:1700 and is connected to a primary voltage of 1000V. Determine the primary current at full load.

    2. Relevant equations
    Vs/Vp = Ns=Np = Ip/Is

    3. The attempt at a solution
    I think it is 1700/200=Vs/1000=8500V
    But, I do not know how to calculate the current,
    I think it is 5kVA/8500 is Secondary current
    then when I have Secondary current is 10/17 (0.58823)
    ((10/17) x 8500) / 1000 = 5A

    I think the primary current at full load is 5A????

    Thank you
     
  2. jcsd
  3. Apr 19, 2015 #2

    Merlin3189

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    Gold Member

    All sounds good to me.
    Since it is ideal, 5 kVA can be used on primary or secondary:
    primary 1000V x 5A or secondary 8500V x 0.588A both = 5 kVA
     
  4. Apr 19, 2015 #3

    rude man

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    Homework Helper
    Gold Member

    Since the transformer has capability of 5000 VA and 1000V is connected to the primary, the input current is at "full load" is 5000/1000 = 5A, a quick way to your answer.
     
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