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CT ratios _Help Fast Please

  1. Apr 18, 2013 #1
    Hi,
    A 132kV to 50kV single phase 30MVA transformer supplies an electric railway network. It is to be protected with differential protection using an electronic protection relay that accepts 1A CT inputs. If the CTs are to be continuously rated for a 40MVA load what would be the ideal turns ratios?

    I do not know weather the ratio is based off of the 30MVA or the 40MVA?? From there its easy.

    I think since its still a 30MVA a tx i should use that - but since its differential it really makes no difference????

    Its for a quiz.

    Thanks
     
  2. jcsd
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