Is this article on Delta-Delta phase rotation correct?

[Buckeye46]

http://technotes1.blogspot.com/2015/10/phase-rotation-on-delta-delta.html?m=1

I'm a substation maitanence engineer and I just can't wrap my head around it. I personally was always taught you have to put phase rotation (ABC or ACB) as one of the highest priorities. He depicts that if you wire the transformer ACB that the system (ABC) will compensate for this by rotating the vectors in the opposite direction thus still giving you positive sequence essentially, or at least vectorally they will align, I call BS. No matter how I wire a transformer the vectors will always rotate counter clockwise. Can someone chime in and either agree or disagree with a brief explanation? What am I missing.

 

[stevenal]

Transformer connections cannot alter phase sequence, and I agree with his vector diagrams. The clockwise vectors are not really reversed, since you still have ABC rotation. You can invert the diagram if you prefer to see counter-clockwise rotation.

 

[Buckeye46]

So just to confirm, I could wire a delta delta transformer 1 of 6 ways as long as I match H1 to X1 and etc... "phase sequence" can be ignored?

 

[dpc]

"Rotation" is not the best way to think about this. Think instead about phase sequence as stevenal suggests.

 

[stevenal]

This Wolverine agrees with Buckeye's confirmation.