Telemeter carrier channels

THE POWER SYSTEM operated by the Tennessee Valley Authority is centrally located in the vast network of power systems serving the south Atlantic and central United States and its generation, furnished by 32 major plants, represents about 14 per cent of the total interconnected pool capacity. The Authority´s 6,666-mile transmission system is interconnected with neighboring power companies by 17 major transmission lines at 12 locations. For efficient control of generation and tie-line loadings, it has been found imperative to furnish the power system load dispatchers with a clear picture of power flowing at vital points. To secure maximum benefits from the intersystem tie lines, 68 carrier terminals are installed at 25 locations to establish the major portion of a 6,500-mile telemeter and automatic load-frequency control system. The quantity and direction of power flowing in the intersystem tie lines is telemetered an average distance of 172 miles to an operating office where the tie-line loadings are totalized.