×
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

Autotransformer ratings

Autotransformer ratings

Autotransformer ratings

(OP)
We have an autotransformer (3 phase/Wye) with taps marked
230V,380V,460V,575V on each phase coil. The name plate
shows 175 KVA. Please advise, what this KVA is related to?
Is this a rated capacity at any of voltage levels? How to
determine a maximum load in step-down configuration?

RE: Autotransformer ratings

As I understand your question- yes 175 kVA is the rated capacity at each of the voltages listed. The current will change for the various voltages. For example, at 230V, current will be 439A and at 575V current will be 176A. For normal operation, the kVA rating is the maximum load that should be placed onto a transformer.

RE: Autotransformer ratings

(OP)
tgott:
thanks for the prompt response.

RE: Autotransformer ratings

Wouldn't the maximum rating be determined by current, similar to the FCAN and FCBN ratings in a 2-winding dry-type?   If the label isn’t specific, it may make a phone call a good investment.  
  

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