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Homework Help: Transformer and Generator in Per Unit System

  1. Aug 15, 2009 #1
    1. The problem statement, all variables and given/known data

    A 3-phase generator rated 100 MVA, 13.2 kV, X = 20% is connected through a Δ/Y
    transformer to a transmission line whose series reactance is 40 ohms per phase.
    Assume that the base values in the line circuit are 200 MVA and 115 kV.
    Find the generator and transformer reactances in pu for the following cases:
    (i) The transformer is a 3-phase unit rated 100MVA, 13.8Δ/120Y kV, X = 8%.
    (ii) The transformer is composed of three single-phase units, each rated 35 MVA,
    13.8/69 kV, X = 8%.
  2. jcsd
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