Definitions

 

For Both Wye and Delta (Balanced Loads)
VP = Phase Voltage

VL = Line Voltage

IP = Phase Current

IL = Line Current

R = R1 = R2 = R3 = Resistance of each branch

W = Wattage

 


Wye and Delta Equivalent

WDELTA = 3 WWYE

WODELTA = ¾ WDELTA

WOWYE = ½ WWYE

 

 

 

 

 

 

 

Delta and Wye Circuit Equations

Typical 3-Phase Wiring Diagrams and Equations for Resistive Heaters

3-Phase Wye (Balanced Load) 3-Phase Open Wye (No Neutral)





IP = I L IPO = I LO
VP = VL/1.73 VPO = VL/2
WWYE = VL2/R = 3 (VP2)/R WOWYE = 1/2 ( VL /R)
WWYE = 1.73VLIL WOWYE = 2 (VPO2/R)
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3-Phase Delta (Balanced Load) 3-Phase Open Delta












IP = I L/1.73 VP = VL
VP = VL IPO1 = I PO3 = I LO2
WDELTA = 3(VL2)/R ILO3 = 1.73 I PO1
WDELTA = 1.73VLIL WODELTA = 2(VL2/R)