×
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

Utilities Medium Voltage fault detection methods

Utilities Medium Voltage fault detection methods

Utilities Medium Voltage fault detection methods

(OP)
I'm trying to determine how other utilities identify the faulty medium voltage cables after a switchgear trip in a main substation. Assuming that a network is entirely underground, do you measure each segment of the network and a progressive feed oh healthy sections or you do live connection of the switch gear until you find the faulty one?
Can you help?

RE: Utilities Medium Voltage fault detection methods

We use earth fault passage indicators (EFPI) or fault passage indicators (FPI) on the secondary substations on underground open ring distribution circuits. EFPI or FPI indicate the passage and path of fault current. Based on their indication the faulty cable section between two secondary substations is identified and isolated; restoring supplies to all other healthy cable sections via operation of the ring open points and/or main substation CB.

In some cases where EFPI are not yet installed; then faulty section is identified by energizing the cable section in sequential way starting from main substation. This could result in re-tripping of the restored customers or sometimes healthy customers.  

M.A.Sh.
Elect. Engr.

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