×
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!

*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

Directional relay (Forward / Reverse) Set up
2

Directional relay (Forward / Reverse) Set up

Directional relay (Forward / Reverse) Set up

(OP)
How should the directional relay (forward/reverse) be set up when cross tie feeders are connected to Switchgear A and B on both ends?

RE: Directional relay (Forward / Reverse) Set up

Throw in a bit of comms and run a POTT scheme between the ends. Or go with 87L. SEL has a new, relatively inexpensive (at least compared to the top end line diff) two terminal 87L for just such applications.

When one this sentence into the German to translate wanted, would one the fact exploit, that the word order and the punctuation already with the German conventions agree.

-- Douglas Hofstadter, Jan 1982

RE: Directional relay (Forward / Reverse) Set up

It depends on when you want to trip for an overcurrent situation. For example, if the bus is equipped with differential protection I’d recommend setting it forward. If there’s no differential element on the bus, you would want to trip for both directions.

RE: Directional relay (Forward / Reverse) Set up

The Directional relays are for fast clearance of any faults in the interconnector. Hence, the protection shall be set to look in forward direction at both ends of the interconnector, in other words looking away from the busbar and towards the interconnector.

R Raghunath

RE: Directional relay (Forward / Reverse) Set up

(OP)

Quote (wcaseyharman)

If there’s no differential element on the bus, you would want to trip for both directions.
Are you suggesting to use non directional element if there is no differential protection?

RE: Directional relay (Forward / Reverse) Set up

No, I was thinking too narrowly, the subsequent post made me realize my error. The main benefit I see by using directional is for a “through fault” (a fault that is not in that line but fault current is flowing for a fault nearby) only one of the two breakers will trip. That will likely make restoring service a little easier and faster.

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! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close