HW3_assignment

# HW3_assignment - 1 Calculate the per-unit values of the...

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ECE 341 Homework #3 Due: Wed. 05 May. ‘10 (Total: 20 points) Problem 1: A-3 from the text book (7 pts.). Problem 2: The following figure shows a power system consisting of a three-phase generator supplying one load through a transmission line with a pair of ideal three-phase transformers. The base powers and voltages are identified in the picture. ( Note : The numbers for voltages are RMS values of line-line voltages.)

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Wye Delta Line impedance: 1+j1 ohm Vbase1=480 V Vbase2=100,000 V Three phase wye-delta transformer Delta Wye Three phase delta-wye transformer Load 0.082+j0.082 ohm Vbase3=480 V Sbase2=2000 kVA Sbase1=2000 kVA Sbase2=2000 kVA Three phase generator
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Unformatted text preview: 1) Calculate the per-unit values of the line impedance, load impedance, and load end voltage; (4 pts) 2) Sketch the per-phase per-unit equivalent circuit of this power system; (1 pts) 3) Calculate the power factor of the system; (2 pts) 4) Calculate the efficiency of the system; (2 pts) 5) If you are asked to increase the load side power factor to 1 by adding an additional component in parallel with the existing load in the circuit you sketched in 2), what component would it be? a) Sketch your new circuit; and b) Show the calculations of the value of the additional component. (4 pts) Assume the system frequency is 60 Hz ....
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HW3_assignment - 1 Calculate the per-unit values of the...

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