Electrothermal analysis of overhead power lines

Abstract

In this work a complete coupled electrothermal analysis of overhead power lines is presented. The electromagnetic field problem is solved analytically for both the AAC and ACSR cases. The Joule losses thus computed are input to the thermal problem yielding the analytical expression of the thermal impedance. A subsequent novel dynamic thermal analysis of the almost periodic load variations during an extended time period allows the prediction of temperature fluctuations (value and delay) and the prevention of the line expansion and/or overheating.