1100-KV Disconnect Switch Design, Tests, and Application at the Waltz Mill 1100-KV Station

The Waltz Mill Project, performing accelerated life testing of prototype samples of 115-kV to 750-kV, is part of the Electric Research Council's underground transmission system research program. Waltz Mill also serves as a prototype of 1100-kV overhead type substations. This paper describes the design and testing of 1100-kV disconnect switches for application at Waltz Mill and on future systems.