×
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

-ve and +ve sequence measurements

-ve and +ve sequence measurements

-ve and +ve sequence measurements

(OP)
What is the practical way to measure the –ve and +ve sequence impedances of a 138 kV ,52 km long over head transmission line installed on wooden towers , what is the technical specifications of the equipment needed for this test ?

RE: -ve and +ve sequence measurements

The positive and negative sequence impedance, Z+ & Z- for a transmission line should be equals since lines are passive electrical components.

For short transmission line (length <80 kM ~ 50 mi) the Z+ = Z- is equivalent to the voltage measured at the receiving-end (load side) when excited at the sending-end side with a balanced 3-phase voltage source with current of 1 Amp circulating at the receieving-end short-circuited lines.

OBSERVATION:

i- For short transmission line, the two-port network parameter B = Z = R + j.X
    
ii-For short circuit at the receiving end (Vr =0).

iii-From the generalized equation

         Vs = A.Vr+ B.Ir= Z.Ir

Therefore, for Ir=1Amp, |Z |= Vssc with an angle= (I<V)


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