September 2008
Beginner
834 pages
37h 13m
English
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9.3 ANALYSIS OF BALANCED THREE-PHASE CIRCUITS
Balanced three-phase circuits comprising a balanced three-phase source and a balanced three-phase load can be of four varieties, viz., Y–Y, Y–∆, ∆–Y or ∆–∆. We develop a common analysis procedure for all the possible configurations.
9.3.1 Equivalence Between a Y-connected Source and a ∆-connected Source
Let VRY = VL∠0°, VYB = VL∠–120° and VBR = VL∠120° be the three line voltages observed in a three-phase circuit and let IR = IL∠–(θ + 30°), IY = IL∠–(θ + 150°) and IB = IL∠–(θ – 90°) be the observed line currents where the observed phase lag of first line current is expressed as 30° plus some angle designated by 6. If the source is within a black box and we are to guess whether it is a Y-connected source ...
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