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connect the neutral point of the star (secondary) to u phase of primary, and now apply voltage to primary and measure the voltage between V&R, W&B, V&Y and V&B. when you measure voltage b/w

1. V&R the voltage must be maximum,

2. W&B Should be minimum and

3. voltage between V&Y and V&B should be same

U.V&W are primary (Delta)

R,Y&B are secondary (Star)

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