Leblling of Transformer Terminals

       The capital letters are used to label the terminals of each phase on H.V. side. Generally A, B and C are used for three phases. While small letters are used for labelling  the terminals of each phase on L.V side. Generally a, b and c are used for three phases.
       According to the polarities, the terminals are also labelled. Such terminals polarities are labelled using the suffix  and 2. The positive polarities on both sides are indicated by suffix 2 while the negative polarities on both sides are indicated by suffix . The labelling of terminals for phase B are shown in the Fig.1. Similarly the labelling for terminals of other phase of three phase transformer is done.

Fig. 1  Labelling of transformer terminls

       For 3 phase star-star connection the labelling of transformer is shown in the Fig 2 .
Fig. 2

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