## Star delta transformation

**Concept of transformation:** By the application of Kirchoffs Laws some problems cannot be solved and finds great difficulty due to number of equations. Such problems can be simplified by using star-delta or delta-star transformations.

The figure show two systems of connections of resistances. In **star orÂ â€˜Yâ€™ connection** there is a common point for all the three resistors, and in deltaÂ or mesh connection the three are connected in series to form the loop and theÂ junctions are takenout to form three supply points.

**Neutral**â€™. The delta connection

**will have no neutral point**.

Assuming that the star connection is to be converted into delta connection. IfÂ the two networks are to be identical the resistance between any pair of linesÂ will be the same when the third loop is opened.

### Tranformation form ( Y to Î” )

#### How to remember?

**The equivalent delta resistance between any two points**Â is given by the sum of star resistances between those terminals plus the productÂ of these two star resistances devided by the third resistor.

### Transformation from ( Î” to Y )

#### How to remember?

As seen from the above expression it should be rememberedÂ that resistance of each line of the star is given by the product of resistancesÂ of the two delta sides that meet at its end divided by the sum of threeÂ delta resistance.

Title: | Elements of Electrical Engineering – Intermediate Vocatioinal Course, 1st Year |

Format: | |

Size: | 2.4MB |

Pages: | 128 |

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A quien corresponda

Es un excelente grupo, sera un honor participar con ustedes

Saludos gracias

I want to learn more about protection . GIS.

Hi, would u answer me, why in the first place do we need this star-delta transformation..? And where they can be applied…?

Apart from that, the way of the explanation is very easy to remember. Thank you