×
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

SEL-421 and LOP

SEL-421 and LOP

SEL-421 and LOP

(OP)
If you set LOP option to 'N', (which operates LOP logic but doesn't disable any of the voltage polarized directional elements, distances elements, and forward direction overcurrent elements) does your ground overcurrent protection which is toqued with F32QG become non-directional or will it just never operate? With the Y option for LOP, it explicitly states that forward directional overcurrent elements become non-directional but it just says that the elements with option 'N' are not disabled.

RE: SEL-421 and LOP

The answer can be found in the Ground Directional Element section of the manual. It appears that you do not get a direction during LOP with ELOP=N unless you are using the current polarized ground directional elements (ORDER includes I). You also need to follow the logic diagrams in the overcurrent element section of the manual.

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