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#44751 - 11/10/04 08:38 PM Wye-Wye Diagram  
RobbieD  Offline
Member
Joined: Feb 2003
Posts: 231
Canada
Does anybody have a wye-wye connection diagram for a step up transformer. The transformer is fed 208V and the secondary feds a panel at 480V. It would be great if the diagram also shows the grounding and bonding connections.
Thanks in advance!


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#44752 - 11/10/04 09:15 PM Re: Wye-Wye Diagram  
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
 
If 480Y/277V service is needed, the most common transformer configuration will have a 208V-delta winding, served by a 208V 3ø 3-wire source — a neutral conductor is not used.

See “Group A” units at www.acmepowerdist.com/pdf/Page%2014.pdf

See connection 46 at www.acmepowerdist.com/pdf/Page%2055-63.pdf

Grounding of the HO terminal is the same as for other separately-derived systems, such as the more common 480-delta—208Y/120V unit.

Low-voltage wye—wye transformers can have problems with triplen-harmonic currents, so are not too common and should be carefully applied.




[This message has been edited by Bjarney (edited 11-10-2004).]


#44753 - 11/10/04 10:30 PM Re: Wye-Wye Diagram  
RobbieD  Offline
Member
Joined: Feb 2003
Posts: 231
Canada
Thanks for the info! Does anyone have a drawing for a wyw-wye transformer?As per my post.


#44754 - 11/10/04 11:15 PM Re: Wye-Wye Diagram  
Ryan_J  Offline
Moderator
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
I found this thread in the "technical reference" area of this forum. If this isn't what you're looking for, you might search there.

http://electrical-contractor.net/ubb/Forum15/HTML/000065.html


Ryan Jackson,
Salt Lake City


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