IGEE402_Galiana_Fall_2009_Midterm

IGEE402_Galiana_Fall_2009_Midterm - POWER SYSTEM ANALYSIS...

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POWER SYSTEM ANALYSIS IGEE-402 MID-TERM November 11, 2009 Open book and notes, Prof. F.D. Galiana Maximum of 90 points Problem 1 – The phase currents drawn by a three-phase load are equal to the sum of two components, 1 abc I and 2 abc I . As shown below, the first component is known in phase coordinates but the second current component is known in symmetrical components, all in per unit, 1 2 1 1 abc I ⎡⎤ ⎢⎥ =− ⎣⎦ 2 012 1 1 0 I ⎡ ⎤ ⎢ ⎥ = ⎢ ⎥ ⎢ ⎥ ⎣ ⎦ (a) Find the positive sequence current drawn by the three-phase load. (10) (b) Can this three-phase load be a delta-connected load? Explain. (10) (c) Find the ground current. (10) Problem 2 - A three-phase balanced load is connected in form of a wye with branch admittances 2+j and connected to ground through a branch with admittance 1+j. All quantities are in per unit. (a) If the load is connected to a positive sequence voltage source with magnitude 10, find the real
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