×
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

PSS/E Short circuit analysis output question

PSS/E Short circuit analysis output question

PSS/E Short circuit analysis output question

(OP)
Since I'm completely new to PSS/E I have a following question about the output of this file.
I am analyzing a smaller network that is connected to a larger network through a transformer.
A short circuit analysis is made on the bus of the larger network (meaning, I need the equivalent impedance of it to calculate short circuits in the smaller network). Consider the following output from PSS/E:

SS®E ASCC SHORT CIRCUIT CURRENTS THU, MAY 19 2011 14:52
X---------- BUS ----------X
MVA AMP DEG
3PH 2912.16 7310.2 -54.88
LG 3005.43 7544.3 -54.45
THEVENIN IMPEDANCE, X/R (OHM) Z+:/18.457/82.188, 7.28914 Z-:/18.258/82.622, 7.72320 Z0:/16.944/80.360, 5.88722

How do I read the thevenin impedances, because it seems that either R is too large, or I am reading it completely wrong. For example, is the positive sequence X+=18.457 and positive sequence Z+=7.28 ?
The "correct" impedances will be then have to be trasformed to a lower voltage level. But what are the correct values?
Thanks in advance!
(And no, this is not an april joke!)

RE: PSS/E Short circuit analysis output question

Not knowing PSEE (I use ASPEN), I would guess Magnitude/Angle, X/R, for each of the three sequences.

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