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.
Phase shifting transformers
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...
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...
1 - 2 of 7 Posts
Wye/wye transformers are very rare in other than utility systems.
1 - 2 of 7 Posts
- This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Electrician Talk
A forum community dedicated to professional electricians, contractors, and apprentices for residential and commercial work. Come join the discussion about trade knowledge, tools, certifications, wiring, builds, scales, reviews, accessories, classifieds, and more!
Full Forum Listing
Top Contributors this Month
View All
Wardenclyffe
303 Replies
acro
246 Replies
Almost Retired
244 Replies
Recommended Communities
