×
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

Substation transformer
2

Substation transformer

Substation transformer

(OP)
We will be installing a 2 MVA 23KV/480V delta-wye 3 phase oil-filled indoor substation transformer. The catalog shows the six terminals on the HV side. They call it loop fed. Can somebody elaborate on this.

Thanks.

encon5

RE: Substation transformer

It is probably designed for a loop circuit, i.e. continuation of the primary circuit to another transformer. Three terminals are the incoming circuit, three are for outgoing to the next.

RE: Substation transformer

Look carefully at the diagram.  It may show two inputs to a disconnect switch or a removable fuse integral to the transformer.  Six bushings would allow two three-phase ciruits to come into the transformer.  In effect, the transformer is a convenient place to make a "T" tap on the line.

Imagine a group of these transformers wired in series with both ends fed from utility feeders. Any section of cable or any transformer can be taken out of service without a power outage on the other sections.

RE: Substation transformer

If it's loop fed, then alehman is dead on.

The other choice is called "radial" fed.  Only one set of lugs.  rcwilson is describing two radial-feed connections with a selector switch.

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