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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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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
Delta-Connected Sources Line Voltages Vline Vab Vbc Vca Phase Voltages VΦ Va Vb Vc Vline = V
Currents for the Delta Connection Phase Current IΦ Line Current Iline Iline = √3IΦ
Y-Connected Sources Line Voltages Vline Vab Vbc Vca Phase Voltages VΦ Va Vb Vc Vline = √3VΦ
Currents for the Y - Connection Phase Current IΦ Line Current Iline Line Current = Phase Current ---- Iline = IΦ
Power in a Balanced Three – Phase System Total Power is equal to 3 times the power per phase!
Power in a Balanced Three – Phase System (Continued) For a Balanced Y – Connected System
