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#44751 - 11/10/04 04:38 PM Wye-Wye Diagram
RobbieD Offline
Member
Registered: 02/23/03
Posts: 231
Loc: 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 05:15 PM Re: Wye-Wye Diagram
Bjarney Offline
Moderator
Registered: 04/10/02
Posts: 2527
Loc: 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).]
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#44753 - 11/10/04 06:30 PM Re: Wye-Wye Diagram
RobbieD Offline
Member
Registered: 02/23/03
Posts: 231
Loc: Canada
Thanks for the info! Does anyone have a drawing for a wyw-wye transformer?As per my post.
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#44754 - 11/10/04 07:15 PM Re: Wye-Wye Diagram
Ryan_J Offline
Moderator
Registered: 08/19/03
Posts: 1374
Loc: 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
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