Transformer question

Discussion in 'Homework Help' started by skiddman, Nov 17, 2013.

  1. skiddman

    Thread Starter New Member

    Nov 7, 2012
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    0
    Three 45 MVA transformers are connected delta – delta to step down 13.8 kV to 4.16 kV. What is the three phase capacity of this bank? If one transformer fails and the bank is operated open delta what is the new three phase capacity?

    Capacity all three __________

    Capacity open delta __________

    Ipri=45/(13.8x1.73)=1.89
    Isec=45/(4.16x1.73)=6.25

    Im kind of lost on this question if some one can help me solve this it would be greatly appreciated
     
  2. WBahn

    Moderator

    Mar 31, 2012
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    We can't be of much help until you show some work so that we have someplace to start.
     
  3. skiddman

    Thread Starter New Member

    Nov 7, 2012
    26
    0
    I got I pri and I sec so far
     
  4. WBahn

    Moderator

    Mar 31, 2012
    17,716
    4,788
    Could you at least draw a schematic of what the circuit looks like before and after the failure?
     
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