In previous tutorials, the examples provided were mostly for 2-winding transformers. In this tutorial, fault calculations for a 3-winding transformer are presented.

The MVa method results were verified using ETAP Modeling software. ETAP results proves that MVA Method for fault calculation is reliable. The complete tutorial can be downloaded below.

Download:MVA Method 3-Winding Transformer

6 thoughts on “MVA Method for 3-Winding Transformer

  1. saleem

    How this MVA artical of SC covers the impedence of cables/bus duct.

    • Ver Post author

      Please refer to this article. Cables and bus ducts need to be treated similarly but you need to know the impedance and the voltage rating.

  2. David_Omar_Torres


    Model for 4 winding transformer???
    As the impedances are represented, for calculation load flow in ETAP?
    David Torres G.

  3. shozy

    Hello Ver

    I have question regarding the lumped motor x” and generator Z% , where did you get this figure (=17% and 25% ) and for the generator which is X” = 0.113
    Can you please provide me these industry standards for motor & generator, so that my concept become more clear.


    • Ver Post author

      Hi shozy,
      The values 17% and 25% for lump loads are industry acceptable values. Even ETAP use these values for their lump motor loads.

  4. thomas

    Hi Ver,

    thanks for your tutorial. Great!


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