Three-Phase Power. Definitions 4 wires –3 “active” phases, A, B, C –1 “ground”, or “neutral” Color Code –Phase ARed –Phase BBlack –Phase CBlue –NeutralWhite.

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Presentation transcript:

Three-Phase Power

Definitions 4 wires –3 “active” phases, A, B, C –1 “ground”, or “neutral” Color Code –Phase ARed –Phase BBlack –Phase CBlue –NeutralWhite or Gray

Phasor Diagram

Delta-Connected Sources V LINE = V 

Phasor Diagram, V AB as reference

Look at the Currents I  = I LINE /  3

Y-Connected Sources

Phasor Diagram with A as reference

Complete Phasor Diagram V LINE =  3V 

Look at the Currents I  = I LINE

Three-Phase Bridge Rectifier

Conduction Sequence

Average Output Voltage, V dc

rms Output Voltage

Diode Currents

Transformer Secondary Current

Instantaneous Output Voltage

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