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Three-Phase Power

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. Phasor Diagram. Delta-Connected Sources. V LINE = V . Phasor Diagram, V AB as reference. Look at the Currents.

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Three-Phase Power

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  1. Three-Phase Power

  2. 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

  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

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