By Topic

Sag and tension calculations for overhead transmission lines at high temperatures-modified ruling span method

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
M. Keshavarzian ; Commonwealth Edison Co., Chicago, IL, USA ; C. H. Priebe

The ruling span concept is widely used to calculate sags and tensions for new overhead transmission lines and for upgrading existing lines. It provides satisfactory results for a level line with relatively uniform spans at any temperature, or for any span length of a level line at low temperature. The ruling span concept may result in an unacceptable error if it is used to calculate sags and tensions in a line segment with significantly unequal spans at high temperature. This paper presents a method to calculate sags and tensions of multi-span line segments at different temperatures based on the rotational stiffness of suspension insulator strings. A simple equation, based on the parabolic approximation, is derived to calculate changes in the span lengths and conductor sags and tensions. The method follows the ruling span concept but relaxes the fundamental assumption of the ruling span method. The accuracy of the method is compared with the more complex, nonlinear, finite element method

Published in:

IEEE Transactions on Power Delivery  (Volume:15 ,  Issue: 2 )