Interpretation of the rating of a real transformer

  1. The rating of a real transformer is 15 kVA , 2300/230-V then can we say that the primary rms is 2300 V or can we say that the secondary rms is 230 V or both.

    To clarify further, suppose to solve for certain characteristics of this transformer like primary current and secondary current i use the equivalent circuit equation of the transformer referred to the primary side as:

    Vp = aVs + Req*Ip + jXeq*Ip

    Then what should i use for Vp or Vs in the above equation looking at the rating of the transformer.
  2. jcsd
  3. NascentOxygen

    Staff: Mentor

    Hi arpansen, welcome to the famous Physics Forums! :approve:

    The primary would be 2300V and the secondary 230V. Possibly (though I'm not certain) there may be a convention that the specification follows the form primary:secondary. It would be logical to have such a convention, anyway. :wink:

    In practice, I can't think of a case where a power utility would need to step up from 230 to 2300. In the event of such a rare need, I'm sure this would be clearly spelled out in the specs.

    Power engineering is a very pragmatic field. You can work on the basis there's no one trying to trip you up. :smile:
    Last edited: Aug 17, 2014
  4. NascentOxygen

    Staff: Mentor

Know someone interested in this topic? Share this thead via email, Google+, Twitter, or Facebook

Have something to add?

Draft saved Draft deleted
Similar discussions for: Interpretation of the rating of a real transformer