1. Three-Phase Power

2. Definitions 4 wires Color Code 3 “active” phases, A, B, C
1 “ground”, or “neutral”
Color Code
Phase A Red
Phase B Black
Phase C Blue
Neutral White or Gray

3. Phasor Diagram

4. Delta-Connected Sources
VLINE = V

5. Phasor Diagram, VAB as reference

6. Look at the Currents
I = ILINE / 3

7. Y-Connected Sources

8. Phasor Diagram with A as reference

9. Complete Phasor Diagram
VLINE = 3V

10. Look at the Currents
I = ILINE

11. Three-Phase Bridge Rectifier

12. Conduction Sequence

13. Average Output Voltage, Vdc

14. rms Output Voltage

15. Diode Currents

16. Transformer Secondary Current

17. Instantaneous Output Voltage