Present Harmonic Distortion

Discussion in 'Homework Help' started by max1x10tothe6th, Oct 26, 2010.

  1. max1x10tothe6th

    Thread Starter New Member

    Oct 26, 2010
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    0
    hey guys,

    Need help finding present harmonic distortion.

    the problem states we have a 750kva transformer at 60hz running 480 3ph with 5.75% impedance.

    i found FLA to be 477A.

    Effective impedence is 3.04%

    the question asks: Estimate the present harmonic current distortion based on FLA and Efective impedance.

    any suggestions or comments would be greatly appreciated.

    or even a general equation would be awesome.
     
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
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    How did you arrive at FLA=477A and effective impedance =3.04%?
     
  3. max1x10tothe6th

    Thread Starter New Member

    Oct 26, 2010
    2
    0
    FLA came from the NEC codebook.

    3.04% impedence came from Z(effective)=Z(xfmr impedence) x actual load/ xfmr rating

    actual load came from s= sqrt3(V)(I) which is 477(480)(sqrt3)
     
  4. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    Presumably from your FLA value the stated 480V is the line-to-neutral voltage?
     
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