×
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

Interesting fault results!? Any explanation?

Interesting fault results!? Any explanation?

Interesting fault results!? Any explanation?

(OP)
Hi,

I have performed fault anaylsis using SKM, the results obtained is quite interesting...

The biggest initial symmetrical current is LLG 19.5kA followed closely by SLG 19.36kA

However the highest asymmetrical current is SLG 47.5kA and 46.6kA for LLG fault. Why is this reverse?

Dont know why? Can any one help

Thanks

RE: Interesting fault results!? Any explanation?

Are you asking why the asymmetrical currents are higher than the symmetrical (which is typical), or why the asymmetrical SLG is higher than the LLG?

RE: Interesting fault results!? Any explanation?

The ratio of asymmetrical to symmetrical depends on the X/R ratio of the fault impedance.  This ratio is different for Z1, Z2, and Z0.  Z0 has more influence in the SLG fault than in the LLG fault.  The Z0 may be dominated by a large power transormer that has a high X/R ratio compared to the system impedance.

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