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General Power angle question

  1. Dec 6, 2005 #1
    <B>General Power angle question</B>

    If I have a synchronous machine that has an armature voltage with a power angle of 120 degrees, is the machine operating as a motor or a generator and why? I have found conflicting answers to this question and need to straighten this up. For my homework problem, it is a 3-phase 1MVA, 2300V, 60Hz and Xs=0.9pu negligible stator resistance, and connected to an infinite bus. Vt=2300 at 0degrees and Ef=3450 at 120 degrees. Any help would be appreciated. I need to determine the power transfer and power factor and to do this I need to know how the machine is operating.
    Last edited: Dec 6, 2005
  2. jcsd
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