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#44751 11/10/04 08:38 PM
Joined: Feb 2003
Posts: 231
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RobbieD Offline OP
Member
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!

#44752 11/10/04 09:15 PM
Joined: Apr 2002
Posts: 2,527
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Moderator
 
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
Joined: Feb 2003
Posts: 231
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RobbieD Offline OP
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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
Joined: Aug 2003
Posts: 1,374
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Moderator
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.

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


Ryan Jackson,
Salt Lake City

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