×
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

Reactors on Substation Feeders

Reactors on Substation Feeders

Reactors on Substation Feeders

(OP)
I was recently looking at a utility Substation that had 13.8kV MetalClad Switchgear with a double bus / double breaker arrangement which had reactors on each of the outgoing feeders. The reactors appear to be 1.5ohm/400A, 1.5ohm/600A and 1ohm/600A combos.

Are these reactors used simply for limiting fault current at the feeders downstream location or is there perhaps another reason why these reactors may be used?

RE: Reactors on Substation Feeders

(OP)
I forgot to include this Switchgear is fed from two 56MA 69/138-13.8k transformers.

RE: Reactors on Substation Feeders

Probably fault current limiting, but there's not enough information to evaluate the situation and determine other possible uses.

RE: Reactors on Substation Feeders

Usually to limit fault current, sometimes to help over current devices coordinate. There might be other reasons. Around me when 13.8kv and 23kv substation transformers are run with their secondaries paralleled (bus tie breaker(s) normally closed) the feeders are equipped with reactors to keep the fault current under 12.5ka. Most distribution equipment is rated for 10,000 amps max, so keeping the current at and below that level is necessary.

RE: Reactors on Substation Feeders

Maybe they are related to closed transition of two sources feeding an important load.

J. Horak, P-R Engineering, Colorado

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