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A three phase transformer is one of the vital apparatus in the power systems. In addition to the voltage ratios and KVA ratings, one of the most important specifications is the transformer vector group. A transformer vector group is required to be known from the angle of parallel operation of two similar transformers. In practice, the voltage measurements on two sides are used to deduce the vector group from the literatures about the vector geometries. In this paper the authors have fed the readings to a special purpose MATLAB program and confirmed the exact angle between the two line voltages and hence the vector groups.