le04 - 1 EE 2315 Lecture 04 Wye/Delta& Delta/Wye...

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Unformatted text preview: 9/29/2009 1 EE 2315 Lecture 04 - Wye/Delta & Delta/Wye Conversions and Delta/Wye Conversions and Node Voltage Analysis Wye/Delta Conversion (1/2) R 1 R 2 a b R R c a b Wye Delta R 3 a c R a R b a c Wye/Delta Conversion (2/2) 1 2 1 3 2 3 1 a R R R R R R R R R R R R R R 1 2 1 3 2 3 2 b R R R R R R R R 9/29/2009 2 Delta/Wye Conversion 1 b c a b c R R R R R R 3 a b a b c R R R R R R Effects of -Y & Y- Conversions • -Y Conversion eliminates a loop but adds a node. • Y- Conversion eliminates a node but adds a loop. Y- Conversion Example Find R ab Several 10 30 20 400 a e Methods: We choose to eliminate node c, then simplify. 20 12 120 c b d f 9/29/2009 3 Y- Conversion Calculations 20 12 20 30 12 30 20 12 20 30 12 30 100 12 ed R 20 12 20 30 12 30 60 20 df R New Circuit 10 100 40 400 a e d 20 60 120 b d f Further Simplifications 10 20 40 80 a e 40 40 80 40 10 20 60 40 80 40 ab R 20 40 b d f 9/29/2009 4 Introduction to Node Voltage Method • More direct than branch equations • Fewer equations to solve • Choose one node as reference...
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le04 - 1 EE 2315 Lecture 04 Wye/Delta& Delta/Wye...

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