12 pulse transformers

[Drivesrock]

Hi all!

What would be the advantages of using a Dd0Dy5 double secondary transformer for a large 12 pulse ac drive instead of Dd0Dy1? Both configurations shift the Y secondary voltage waveforms 30degrees for low order harmonic elimination/reduction which is what I am looking for. I understand the Dy5 is 150dgrees thereby dislocating all the phases by one (120degrees) then 30degrees (if you understand me!).

I thank you all in anticipation.

Drivesrock

 

[HCBFlash]

Hi drivesrock.

I'd love to participate or follow a discussion of this if I had a clue as to the item referred to as " a Dd0Dy5 double secondary transformer ". My web searches only turn up a document in German (Deutch),,,, and it's been about 30 years since I had to read anything in that language.

Perhaps a description or link would help a bit.

Please let us all know how this works out for you! and don't forget faq731-376

 

[waross]

HCBFlash;
Try:
"What does the vector symbol means in two winding, three phase transformers?
faq238-1090".
Thanks to Ralph Christie for this FAQ.
respectfully

 

[waross]

This FAQ may also be useful:

"Can I parallel a DY1 and DY11 transformer? faq238-1154"
Thanks to stevenal for this FAQ.
respectfully

 

[electricuwe]

In that application there will be no difference in the performance of the 12-pulse rectifier due to the different vector groups. You could easily convert one into the other by relabeling the output phases.