CT transformer Burden formula transposition?

Discussion in 'Homework Help' started by stinky111, Dec 4, 2011.

  1. stinky111

    Thread Starter Member

    Apr 7, 2011
    39
    1
    Hi guys,

    stuck on one final question revising for a transformers final..

    A CT has a 25VA Burden rating. The connected ammeter requires 4A for full scale deflection. What is the maximum allowable impediance??


    The only burden formula I have in my notes is: Burden = I2Z (VA)

    Im very average on formula transposition, obviously I must need to transpose above formula to allow me to find maximum allowable impediance..
    Is this correct?? If so could an one please help with explaining the process?

    Thx in advance..
     
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    That formula

    Burden=I^2Z [VA]

    will do just fine.

    So make Z the subject of the equation and you will hopefully have the correct solution.
     
  3. stinky111

    Thread Starter Member

    Apr 7, 2011
    39
    1
    Would it be Z=I^2/VA???
    Thx
     
  4. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    Try

    Z=burden[VA]/I^2

    ....
     
  5. stinky111

    Thread Starter Member

    Apr 7, 2011
    39
    1
    Thx very much yet again for your time:)
     
    Last edited: Dec 5, 2011
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