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Unformatted text preview: Problem Set #1 Basic concepts complex algebra and three-phase balanced circuits 1-1 (Grainger and Stevenson, Jr. Chapter 1, Prob 1.12) Evaluate the following expressions in polar form: a) a-1 b) 1- a 2 + a c) a 2 + a +j d) ja + a 2 1-2 (Grainger and Stevenson, Jr. Chapter 1, Prob 1.13) Three identical impedances of 10 -15 are Y-connected to balanced three-phase 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 . 1-3 (Grainger and Stevenson, Jr. Chapter 1, Prob 1.14) In a balanced three-phase system the Y-connected impedances are 10 30 . If V bc =416 90 V, specify I cn in polar form. 1-4 (Grainger and Stevenson, Jr. Chapter 1, Prob 1.16) Determine the current drawn from a three-phase 440-V line by a three-phase 15-hp motor operating at full load, 90% efficiency, and 80% power-factor lagging. Find the values of P and Q drawn from the line....
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- Fall '07