Star-Delta And Delta-Star Transformation

Star Delta Transformation:

Star- Delta transformation and Delta-Star transformation allows us to convert impedance connected together in a 3-phase configuration from one type of connection to another.

The standard 3-phase circuits take two major forms with names that represent the way in which the resistances are connected, a star connected network represented by symbol 'Y' and a Delta connected network represented by symbol '△' .

If 3-phase ,3-wires supply or even a 3-phase load is connected in one type of configuration, it can be changed or transformed into an equivalent configuration of another type by using either of star-delta or delta-star transformation.process.

Delta to Star Network:

                                               Consider following circuit

                             Here, comparing resistances between terminal 1 and 2

Resistances between terminals 2 and 3

Similarly, between terminals 1 and 3

Solving these equations

Again,

Similarly,

Star to Delta Transformation:

The value of the resister or any one side of the delta network is the sum of all the two-product combinations of resisters in the star network divided by the star located "directly opposite" the delta resister being found.

Then,