Supervisory control of 30,000-kva hydroelectric plant

Ocoee 3, a 1-unit 30,000-kva supervisory-controlled generating station of the Tennessee Valley Authority, has been in operation since April 30, 1943. An underground cable was selected for the control and telemetering channel, and neutralizing transformers were installed to protect against voltage rise resulting from transmission line faults. Instrumentation, controls, and station auxiliaries were designed particularly to safeguard the unattended equipment. Maintenance includes two or three inspections per week. The cost of supervision, operation, and maintenance is as low as $0.101 per 1,000 kilowatt-hours.