×
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

B-H Curves of Large Power Transformers

B-H Curves of Large Power Transformers

B-H Curves of Large Power Transformers

(OP)
Hi folks,

In general, transformer manufactures can not measure the complete B-H  curve (based on the V-I curve) of large power transformers (above 100MVA). This is because of the small short-circuit power in their laboratories which is not enought to saturate deeply large transformers.

Normally, they measure the V-I (B-H) curve of the winding on the ferromagnetic core supplying voltage up to 120% of the nominal voltage. Then, they  measure the V-I (B-H) curve of the winding without the transfomer core (air core reactance) and, graphically, join these two curves.

My question is:
 
1) At which point these two curves should be joined?

2) Is that point the "knee point" of the B-H curve?

Best regards,

Herivelto Bronzeado
  

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