Long-term-creep assessment for overhead-line conductors

Based on the strain-hardening-material law, a method of long-term-creep prediction is proposed which takes into account all practical line-design and operating conditions and estimates the reduction in conductor tension and the increase in its sag due to creep with acceptable accuracy. Correlation between theory and practice is illustrated by both laboratory and field measurements. Selected examples are given on the application of the method for line design and for the selection of optimum sagging procedure of a line. Areas of further research and investigations on overhead-line creep are indicated.