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Delta-Wye Conversions

These equations are used to transform a delta-connected set of resistances to a wye-connected (Y-connected) set of resistances.

            Delta transformer winding drawing<===>Wye Y transformer winding drawing

Δ - Y  Conversion
R1 =
Ra + Rb + Rc
R2 =
Ra + Rb + Rc
R3 =
Ra + Rb + Rc

Y - Δ  Conversion
Ra =
R1·R2 + R2·R3 + R3·R1
Rb =
R1·R2 + R2·R3 + R3·R1
Rc =
R1·R2 + R2·R3 + R3·R1

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