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Unformatted text preview: ECE 3070 H OMEWORK #1 S pring 20 10 D UE : Feb . 1 1. Textbook Problem 2-5. 2. Consider the three phase system shown below consisting of a two three phase loads connected to the source through a line which has an impedance of 0.8+j2.4 Ω . Assume that V ab has an rms value of 460 V. 144 - j42 Ω A B C 0.8 + j2.4 Ω 144 - j42 Ω 144 - j42 Ω 0.8 + j2.4 Ω 0.8 + j2.4 Ω a b c 460V R R R Load #1 Load #2 3ø Source (a) Find the real and reactive power in load #1. Be sure to state whether the reactive power is positive (consuming) or negative (generating). (b) Find the value of R such that the total power consumed by load #1 and load #2 is 20kW. (c) Now suppose that R = 20 Ω . Find the magnitude of the line current, I Aa . (d) Again with R = 20 Ω . Find the total real and reactive power delivered by the source. 3. Consider the balanced three phase system shown below. Assume V = 1365 V. 90+j120 Ω V -120 V 120 + - + - 90+j120 Ω 90+j120 Ω A B C a b c V 0 1.5+j2 Ω 1.5+j2 Ω 1.5+j2 1....
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This note was uploaded on 02/20/2010 for the course ECE 3070 taught by Professor Harley during the Spring '09 term at Georgia Tech.
- Spring '09