×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Transformer

Transformer

Transformer

(OP)
I need to provide single phase 240V, 125 A to a medical device. Problem is, the only source I have is 3- phase 208V Y.
Suggestions?

RE: Transformer

Using a 5kVA 240V-to-32V buck/boost transformer, a load of 156A @ 236V could be served from a 208V supply.  Note that only a 2-wire load could be served, and not a 3-wire (120/240V) load.  One application guide is at http://www.federalpacific.com/IN-7900.pdf ; The 236V-circuit voltages to neutral will be significantly unbalanced.   NEC Article 450 requirements apply.

RE: Transformer


Note that the load on the 208V circuit will not be balanced.  Only two phases will have load current.  For a 125A/236V load, the phase current on the 208V side will be ~144A.

There is a variation on the listed single buck/boost transformer configuration that will give closer to 240V on the higher-voltage terminals, but will serve somewhat lower current.

Can you give us some more details on the load equipment?

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources