×
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

460V to 400V AC 3PH

460V to 400V AC 3PH

460V to 400V AC 3PH

(OP)
I have a bunch of european equipment that runs on 400VAC 3PH.  Currently, we are stepping 460V down to 230V with one transformer.  Then going from 230 to 400 with another.  This seems like such a waste of resources just to drop the voltage 60 volts.  There has to be a solution out there besides custom built transformers.  Anyone solve this problem?

RE: 460V to 400V AC 3PH

If voltage is your only issue (I would imagine that frequency is too), then you need what is called a "buck boost" transformer. Easy to order, easy to install, available in a wide variety of voltage reductions / gains.

But what are you running? AC motors may not need any changing at all, and in fact if you do drop the voltage you may burn them up. Post more details.


"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln  
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies  

RE: 460V to 400V AC 3PH

(OP)

It is machinery from France that requires 400 VAC 3PH,  50 or 60 Hz.  The power is distributed to Servo, AC drives, and 24VDC power supplies in the machine panel.  I've looked at many different buck/boost transformers, but can't seem to find one that "bucks" 60 volts.  

RE: 460V to 400V AC 3PH

Ask your local electrical rep (Sq D, GE, ABB or the like) to quote an auto-transformer, which is what a buck-boost transformer is. Provide them the ratings you want.  Even look up and ask any transformer manufacturer in your area.

The term buck-boost is generally associated with smaller sizes auto transformers (a few VA and 240 to 220V ), in the USA.

Rafiq Bulsara
http://www.srengineersct.com

RE: 460V to 400V AC 3PH

If you don't need a neutral the open delta auto transformer is often the cheapest solution.

Bill
--------------------
"Why not the best?"
Jimmy Carter

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