×
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

3-leg core type vs 4-leg shell type vs 3 single phase bank

3-leg core type vs 4-leg shell type vs 3 single phase bank

3-leg core type vs 4-leg shell type vs 3 single phase bank

(OP)
A Y/YG transformer, Y side connects to a source and Y grounded side connects to lines. There is no zero sequence current return path as the Y side is ungrounded. However, for a core type transformer the residual leakage flux through the tank wall cannot be ignored. The air gaps have very high reluctance and because at any time the flux cannot make a sudden change, therefore for a given flux at a time the higher the reluctance the higher current is required, and thus the lower the Z0. For a shell type transformer Y/YG, the zero sequence current is trapped in the core steel that has very low reluctance than the air gap, on the other side it has very high Z0 compared to core type Y/YG transformer. What about a 3-single phase connected Y/YG bank?

RE: 3-leg core type vs 4-leg shell type vs 3 single phase bank

The bank made up of single phase units will act similar to shell type 3 phase unit as zero sequence flux has the return magnetic path in the single phase core.

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