IGEE402_Galiana_Winter_2010_Midterm - MID-TERM TEST-POWER...

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MID-TERM TEST-POWER SYSTEMS ANALYSIS-ECSE-464 PROF. F.D. GALIANA THURSDAY, FEBRUARY 18 TH , 2010 1:05 TO 2:25 pm YOU MAY BRING A SINGLE SHEET OF PAPER AS A CRIB SHEET; ANSWER ALL 4 QUESTIONS, EACH QUESTION BEING WORTH 25 POINTS FOR A MAXIMUM OF 100 POINTS (1) The phase voltages at the sending end of a 3-phase transmission line are related to the 3-phase currents and to the phase voltages at the receiving end by, s a s b s c V V V = 30j 4 2 1 1 4 2 2 1 4 a b c I I I + r a r b r c V V V The currents in A are known to be equal to, 2 1 500 a b c I Ia a I Where 120 o j ae . Find the sending voltages referred to the local earth if the receiving load is a grounded Delta-connected load (grounded at node connected to phase c) with branch impedance equal to 10 j ohms. (2) The impedance matrix of a three-phase load is given by (2+5j) 5 2 1 2 5 2 1 2 5 ohms. Find the real and reactive power consumed by the three-phase load if the zero sequence current drawn by the load is 1 A,
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This note was uploaded on 09/16/2011 for the course IGEE 402 taught by Professor Galiana during the Fall '10 term at McGill.

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IGEE402_Galiana_Winter_2010_Midterm - MID-TERM TEST-POWER...

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