500-kV AC Substation Design Criteria Summary of Industry Practices

In order to determine major trends in 500-kV substation design practices, a survey was made of ten major electric utility systems in the United States and Canada. These findings are presented in tabular form for easy comparison of design features. Major variations in data are identified by an asterisk and are explained in the accompanying discussion following the tabulation. These data should be invaluable to those companies having 500-kV systems under study and will serve as a permanent record of the state-of-the-art. The Working Group has prepared similar data on Hydro Quebec´s 735-kV system and American Electric Power Company´s 765-kV system, which will be published in a separate report.