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Three – Phase Power System

Three – Phase Power System. Three-Phase Power. Definitions. 4 wires 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. Balanced Three – Phase System. Phasor Diagram Positive Phase Sequence abc.

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Three – Phase Power System

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  1. Three – Phase Power System

  2. Three-Phase Power

  3. Definitions • 4 wires • 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

  4. Balanced Three – Phase System

  5. Phasor DiagramPositive Phase Sequence abc

  6. Phasor Diagram Negative Phase Sequence acb

  7. Delta-Connected Sources Line Voltages Vline Vab Vbc Vca Phase Voltages VΦ Va Vb Vc Vline = V

  8. Currents for the Delta Connection Phase Current IΦ Line Current Iline Iline = √3IΦ

  9. Y-Connected Sources Line Voltages Vline Vab Vbc Vca Phase Voltages VΦ Va Vb Vc Vline = √3VΦ

  10. Currents for the Y - Connection Phase Current IΦ Line Current Iline Line Current = Phase Current ---- Iline = IΦ

  11. Power in a Balanced Three – Phase System Total Power is equal to 3 times the power per phase!

  12. Power in a Balanced Three – Phase System (Continued) For a Balanced Y – Connected System

  13. For a Balanced Δ – Connected System,

  14. Three-Phase Bridge Rectifier

  15. Conduction Sequence

  16. Average Output Voltage, Vdc

  17. rms Output Voltage

  18. Diode Currents

  19. Transformer Secondary Current

  20. Instantaneous Output Voltage

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