Audible Noise Performance of Regular and Asymmetric Bundles and effect of Conductor Aging on Project UHV's Three-Phase Test Line

Audible noise produced by corona during foul weather is an important consideration in the design of high-voltage transmission lines. The measurement, analysis and prediction of audible noise and the assessment of noise reduction techniques have constituted a primary area of research at Project UHV. Results of earlier short-term testing utilizing single-phase test facilities have, since 1975, been greatly augmented by longer-term field data obtained on a three-phase test line. This paper presents the results of a portion of this work The effect of the weathering or aging of conductors on noise levels is examined and the effectiveness of the concept of asymmetric conductor bundling for noise reduction is assessed.