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Phase shifting transformers

1029 Views 6 Replies 3 Participants Last post by  cdnelectrician, 
cdnelectrician
We are doing a job that involves the installation of two 30kva UPS units. There is a 600 volt feeder coming from an ATS feeding an MDP which feeds two 75 KVA 600-120/208 volt transformers.

Both transformers have a panel on their secondary sides. Each panel has two breakers, UPS 1 and UPS 2 so the UPS units are double fed. That all makes sense but one of the transformers is 30 degrees out of phase while the other is 0...I am curious as to why they would use a phase shifting transformer in this setup? Can't say I have come across this before...
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cdnelectrician
don_resqcapt19 said:
All delta/wye transformers have a 30° phase shift primary to secondary. That being said I am not sure how you can get a 30° phase shift between the secondaries of the two transformers, I could understand a 60° shift, but not a 30.
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I was thinking the same....will look into more tomorrow.
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cdnelectrician
Had a look in the specs today...the transformer is indeed 0 degrees...I will take a pic of the nameplate tomorrow. From what I can tell it appears to be delta to wye.

Edit: Got my answer, good article.

https://www.google.com/url?q=http:/...IQFjAI&usg=AFQjCNFsdEPBi23RzLav7aZrlgBD2FaJhQ
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