The Apple Grove 750-kV Project- 515-kV Radio Influence and Corona Loss Investigations

This paper describes extensive radio influence and corona loss measurements made for the Apple Grove 500-kV test line which utilized 2-conductor bundles of 1.602-inch (Chukar) subconductors. The Apple Grove extra-high-voltage test project is a joint research project sponsored by the American Electric Power Service Corporation and Westinghouse Electric Corporation with six other participating companies. The data are analyzed for use with automatically recorded statistical data to predict the performance of a long transmission line of the same conductor configuration operating under a similar environment. A measurement technique is described and used to determine the relative radio influence field strength from each of the phases.