Star-Delta And Delta-Star Transformation - LBM4

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Sunday 21 October 2018

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.
This is an image of star-delta and delta-star transformation
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

This is an image of delta to star transformation


                             Here, comparing resistances between terminal 1 and 2

This is an image of delta to star transformation equation

Resistances between terminals 2 and 3

This is an image of delta to star transformation equation

Similarly, between terminals 1 and 3


Solving these equations

Again,



Similarly,


Star to Delta Transformation:

This is an image of 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,



               

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