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Delta and Wye Circuit Equations |
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Written by rsdoran
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Delta and Wye Circuit Equations
Typical 3-Phase Wiring Diagrams and Equations for Resistive Heaters
Definitions
ForBoth 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 | Wyeand Delta Equivalent
WDELTA = 3 WWYE
Open3-Phase Circuit Formulas:
Open Delta Watts = 2/3 WDELTA
Open Wye Watts = 1/2 WWYE
Open 4-wire Wye Watts = 2/3 WWYE
| 3-Phase Wye
(Balanced Load)
 | | 3-Phase Open Wye
(No Neutral)
 | IP = I L
VP = VL/1.73
WWYE = VL2 /R = 3 (VP2) /R
WWYE = 1.73VLIL | IPO = I LO
VPO = VL/2
WOWYE = 1/2 ( VL /R)
WOWYE = 2 (VPO2/R)
WOWYE = VLILO | 3-Phase Delta
(Balanced Load)
 | 3-Phase Open Delta
| IP = I L/1.73
VP = VL
WDELTA = 3(VL2)/R
WDELTA = 1.73VLIL | VP = VL
IPO1 = I PO3 = I LO2
ILO3 = 1.73 I PO1
WODELTA = 2(VL2/R ) |
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