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Unformatted text preview: Problem Set #1 Basic concepts complex algebra and threephase balanced circuits 11 (Grainger and Stevenson, Jr. Chapter 1, Prob 1.12) Evaluate the following expressions in polar form: a) a1 b) 1 a 2 + a c) a 2 + a +j d) ja + a 2 12 (Grainger and Stevenson, Jr. Chapter 1, Prob 1.13) Three identical impedances of 10 15 are Yconnected to balanced threephase line voltages of 208 V. Specify all the line and phase voltages and the currents as phasors in polar form with V ca as reference for a phase sequence of abc . 13 (Grainger and Stevenson, Jr. Chapter 1, Prob 1.14) In a balanced threephase system the Yconnected impedances are 10 30 . If V bc =416 90 V, specify I cn in polar form. 14 (Grainger and Stevenson, Jr. Chapter 1, Prob 1.16) Determine the current drawn from a threephase 440V line by a threephase 15hp motor operating at full load, 90% efficiency, and 80% powerfactor lagging. Find the values of P and Q drawn from the line....
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 Fall '07
 Keyhani

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