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.

Jobs

impedance sequence

impedance sequence

(OP)
hi...can anyone help me how to calculate impedance sequence for groundfault calculation?..

RE: impedance sequence

For a ground fault or single-phase-to-ground fault, the symmetrical component solution is a series connection of Z1, Z2 and Z0. The resulting current, I1, will be obtained from V/(Z1+Z2+Z0). For the actual fault current, If, you need to multiply I1 by 3.

RE: impedance sequence

Ifault = 3V/(Z1 + Z2 + Z0 + Zfault) if you want to include fault impedance


Here is a link to some stuff that will can help you get your head around faults and sequence components.

http://powerprotection.wikia.com/wiki/Analyzing_Fa...


I would also recommend -

Power Systems Analysis by Grainger and Stevenson.

Symmetrical Components for Power System Engineering - by Blackburn - this was meant to be a companion to his relaying book

Circuit Analyses of A-C Systems vol. 1 and 2 by Edith Clarke - both of these volumes are very well written. She does a very good job at explaining and giving insight into her analyses. This is out of print and it is hard to find original copies but it is out of copyright and you can get a pdf through most universities if you have access or can purchase a copy of from India as a print on demand hardcover for $15-20 a vol. (https://www.abebooks.com/book-search/title/circuit...)

RE: impedance sequence

I think what do you need to know-or calculate-are the positive, negative and zero sequence impedances of different elements of a schematic diagram in order to calculate the phase-to-ground fault short-circuit current.
If you intend to follow IEC way-IEC 60909-0 for instance-you have IEC 60909-2 SECTION 2: DATA FOR ELECTRICAL EQUIPMENT. You could find here data on typical synchronous, induction machines, transformers, overhead line and cables.

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


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