Transfomation of wye-delta and delta-wye networks

1. Engr. Maria Romina P. Angustia

2. Objective of Lecture
Describe the equations that relate the
resistances in a Wye (Y) and Delta (∆)
resistor network.
Wye networks are some times called T
networks and
 Delta networks are occasionally called Π
networks.

3. Wye and Delta Networks
3 terminal arrangements:
Wye (Y) Delta (∆)

4. To transform a Wye into a
Delta

5. To transform a Delta into a Wye

6. Simplification:
If R1 = R2 = R3 = R, then
Ra = Rb =Rc = 3R
If Ra = Rb = Rc = R’, then
R1 = R2 = R3 = R’/3

7. Transform the wye network shown to a
delta network.