T-line Impedance
T-line Impedance
(OP)
Does anyone know where I can get info on the T-line impedance. I have 795ACSR line with normal tangent structure and wondering how to obtain/calculate the impedance per mile (ohms/mile)
thanks
james001
thanks
james001






RE: T-line Impedance
The calculation has to take into account the self-inductance of each conductor as well as the mutual inductance between phases. This depends on conductor geometry as well as spacing and configuration. Zero-sequence calculations require information (or assumptions) on earth resitivity and height above ground.
It's a little involved, but not really that difficult if you have a good reference.
RE: T-line Impedance
1. EPRI's "Transmission Line Reference Book". It has extensive tables and you may be able to find your line without doing the calculations yourself.
2. B.M.Weedy, "Electric Power Systems". This book has the necessary formulas (pages 71-75) and some tables. The explanation of the formulas is given in an easily understandable way.
I don't want to give you the formulas here, because you need to understand how they are affected by the conductor geometry, which you can only get by reading the textbook.
Michael Sidiropoulos
RE: T-line Impedance
http://ceaspub.eas.asu.edu/PowerZone/SparseVisual/Lecture%20slides/Lecture%2016/Branch%20Modeling.ppt
http://xnet.rrc.mb.ca/janaj/E602%20Power%20Systems/transmission%20lines%20characteristics.doc
etc. for more info
RE: T-line Impedance
Michael Sidiropoulos
RE: T-line Impedance
There is a free program at the above site.