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Description of  Three Phase Transformers - 3 Phase Transformers Detailed Book: Three-phase Transformers

Three-phase voltages may be transformed by means of three-phase transformers. The core of a three-phase transformer is made with three legs, a primary and a secondary winding of one phase being placed on each leg. It is possible to construct the core with only three legs since the fluxes established by the three windings are 120 apart in time phase. Two core legs act as the return for the flux in the third leg. For example, if the flux is at a maximum value in one leg at some instant, the flux is half that value and in the opposite direction through the other two legs at the same instant. Learning Objective :- Three-phase Transformers Three-phase Transformer Connections Star/Star or Y/Y Connection Delta-Delta or Connection Wye/Delta or Y/ Connection Delta/Wye or /Y Connection Open-Delta or V-V Connection Power Supplied by V-V Bank Scott Connection or T-T Connection Three-phase to Two-Phase Conversion and vice-versa Parallel Operation of 3- phase Transformers Instrument Transformers Current Transformers Potential Transformers