# Lecture2 - ECE 431 Electric Machinery Lecture 2 Review of...

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1/29/2011 1 Acknowledgement – These handouts and lecture notes given in class are based on material from Prof. Philip Krein’s ECE 431 lecture notes. Disclaimer – These handouts only provide highlights and should not replace the class notes or course textbook. ECE 431 Electric Machinery Lecture 2 Review of Three-Phase Systems (1) 1 Copyright ©2011 Ali M. Bazzi. All rights reserved 1/29/2011 Three-Phase Systems • Three-phase voltages: – Equal frequency. – Equal magnitude. – 120 o out of phase. • Why three-phase? – Constant instantaneous power. – Best power result for minimum wire (highest W/wire) for ac systems. – Uniform rotating magnetic field. 2 Copyright ©2011 Ali M. Bazzi. All rights reserved 1/29/2011

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1/29/2011 2 Three-Phase Systems • Two main configurations: Wye and Delta. • Single phase: • Three phase: • Three-phase complex power: • For a given load Z , 3 Copyright ©2011 Ali M. Bazzi. All rights reserved 1/29/2011 * 1 S V I ϕ = * 3 3 S V I = 3 | | 3 | || | 3| || | ll l S V I V I = = 3 . S Z = ∠ Phase and Line Phase voltage ( V φ ) and phase current ( I φ ) are
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Lecture2 - ECE 431 Electric Machinery Lecture 2 Review of...

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