Technique to decrease the electric field intensity on conductor surface using the asymmetrical-sized conductor bundle

Corona discharges form at the surface of a transmission line conductor when the electric-field intensity on the conductor surface exceeds the breakdown strength of air. In order to decrease the electric-field intensity on the conductor surface, a new 6 conductor bundle has been studied. This bundle, asymmetrical-sized conductor bundle, consists of a large subconductor at the bottom two conductor positions in the 6-conductor bundle of each phase of the line. The electric field intensity on these two large subconductors is reduced which in turn reduces the corona noise. It is proven that the newly proposed method is a better solution for decreasing the electric- field intensity than either the conventional bundle or the asymmetric bundle proposed by EPRI(Electric Power Research Institute).