Vector group of transformer
The naming convention popularly known as Vector Group of Transformer was established by the International Electrotechnical Commission (IEC) through IEC 60076-1. This was done in order to create a notation for three-phase transformer winding configuration.
Common Symbol Designation
Y or y – star windingD or d – delta winding
N or n – neutral
0 to 12 – phase displacement in terms of clock position in multiples of 30°.
According to the standard, the notation should follow HV-LV-Phase displacement sequence with the HV winding in uppercase and LV winding in lowercase.
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