Transformer Vector group | how transformer vector group form

Transformer Vector group FOLLOWING QUESTION GOING TO DISCUSSES OVER HERE WHAT IS VECTOR GROUP? HOW VECTOR GROUP IS CREATED IN TRANSFORMER? WHY VECTOR GROUP IS DENOTED WITH (0 TO 11)? WHAT IS THE SIGNIFICATION OF CHECKING VECTOR GROUP. APPLICATION OF VARIOUS VECTOR GROUP. and also here i have show how to draw phasor diagram for vector group.