STAR-DELTA Conversion

The Y-Δ transform, can also be spelt as wye-delta.This star-delta transformation theory was proposed by Arthur edwin kennelly in 1899.Star-delta transformations allows to convert impedances that are connected together from one type of connection to another type.

   We can now solve series, parallel or bridge type resistive networks using Kirchoff´s Circuit Laws, mesh analysis or nodal analysis techniques but in a balanced three-phase circuit. we now can reduce by mathematical solutions.

         The networks star and delta are obtained from resolving the T and PI resistor networks respectively.If we consider some different examples of T and PI they are shown aa below.

PI to DELTA

T to STAR

Star-delta & Delta-star transformations are used in DC Circuit Theory for analysis of Complex Circuits.Star-Delta Transformer Connection is now commonly used for power supply transformers.