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


SEL-751A Modeled in ETAP

SEL-751A Modeled in ETAP

SEL-751A Modeled in ETAP

Good day all,

With the available settings in ETAP in reference to the SEL-751A, how do I incorporate the fiber-optic arc-flash detector to lower the category of the busses that I am faulting. The only curves I can alter are the normal phase, neutral, ground, and negative sequence overcurrent and instantaneous settings. I would assume there is a way to introduce the extra arc flash mitigation of the 751A, but I'm at a loss.
Any ETAP specialist out there that can steer me in the right direction?

Thank you in advance,

RE: SEL-751A Modeled in ETAP

In the past, for arc flash detection on specific busses I will create a new scenario in which I force clearing time to that of an arc flash event. I generally use a half cycle for pickup and processing, half cycle for contact assertion, and three or five cycles for breaker clearing (depending on breaker).

RE: SEL-751A Modeled in ETAP

As ZeroSeq as said - the only way you can incorporate such a feature is to manually trigger the clearing/trip time of the protective device at the fault location based on manufacturers test data.

RE: SEL-751A Modeled in ETAP

This can be modeled in ETAP for any protective device as mentioned, but unless the manufacturer will guaranty this system will work on all instances of arc fault (which they won't; I've asked) I would not include it in an AF calculation.

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!


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