1. Three Phase Circuits Tuesday, September 13 th, 2005

2. Today Single-Phase Three-Wire Systems Three-Phase Wye-Wye Systems Delta Connection Wye-Delta Transformations

3. Single Phase Three-Wire Systems

6. + or

7. Example Find I 1, I 2 and I nN !

8. The determinant is Solving by matrix inversion

9. Three-Phase Wye-Wye Systems Positive or abc sequence Negative or acb sequence

12. 

13. Delta Connection

14. Wye-Delta Transformations

15. Find the currents I aA, I bB, and I nN in this symetric single phase three wire systems. Sketch in phasor diagram !

16. In the Wye-Delta system shown, the source is positive sequence with Van = 100  0 Vrms and the phase impedance is Zp = 3 – j4 . Find the line voltage VL, the line current IL and the power delivered to the load !