The Apple Grove 750-kV Project: Statistical Analysis of Radio Influence and Corona-Loss Performance of Conductors at 775 kV

This paper presents the results of a statistical analysis of conductor radio influence (RI) and corona-loss data taken over a one-year period on three 775-kV test lines at the Apple Grove 750-kV project, a joint extra-high- voltage ( EHV) field investigation sponsored by American Electric Power Service Corporation and Westing- house Electric Corporation with six other participating companies. Verification of the Apple Grove project special design features is discussed, and long-term averages of corona-loss and RI performance of conductor diameters of 1.382, 1.196, and 1.00 inches used in four-conductor bundles are presented along with their standard deviations. Very little correlation was found between fair weather RI and weather variables. Data are presented showing the effect of rain intensity on foul weather RI and corona loss.