Wye-Delta Transformation in Electronics Devices and Circuits, Slides of Engineering

Download Wye-Delta Transformation in Electronics Devices and Circuits and more Slides Engineering in PDF only on Docsity! Presentation on “electronics devices and circuit” Topic :”wye-delta transformation” Prepared by: Zainab Ather THREE PHASE TRANSFORMERS Three Phase Transformers A three-phase transformer is made of three sets of primary and secondary windings, each set wound around one leg of an iron core assembly. Essentially it looks like three single-phase transformers sharing a joined core as in Figure. Three-phase transformer core Three phase transformer core has three sets of windings. Those sets of primary and secondary windings will be connected in either A or Y configurations to form a complete unit. The various combinations of ways that these windings can be connected together in will be the focus of this section. * The two constructions Three Phase Transformers fi Ne 4 Three Phase Transformers * 3 phase transformer connections * The windings of primary and secondary (in any construction) can be connected in either a wye (YY) or delta (A) * This provides a total of 4 possible connections for 3 phase transformer (if Neutral is not grounded): (a) Wye-wye Y-Y (b) Wye-delta Y-A (c) Delta-wye A-Y (d) Delta-Delta A-A  Ts; Three Phase Transformers WYE-DELTA CONNECTION Such connections are used where voltage is to be stepped down, e.g.at the end of transmission line. The neutral of primary winding is earthed. Y; Vip=V3 Ver, while: for A; Vis= Ves Voltage ratio of each phase : Vor/ Ves=a Vie/ Vis= V3 Voer/ Veos= V3a €© Y-A This configuration causes secondary voltage to be shifted 30° relative to primary voltage