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You are mixing up 'phase angle' with 'angular displacement' (or 'phase displacement'); these are two completely different things. The term you should be using is 'angular displacement', which is the angle by which the secondary line voltages lagthe primary line voltages. The '7' indicates that this is 7 times 30 degrees; or 210 degrees.

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Q: What is phase angle of YD7 vector group?
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