Electrical auxiliary supply systems for hydro-electric power plants

The paper examines the auxiliary equipment of hydro-electric generating stations and associated dams, spillways and other works in respect of the essentiality of electrical auxiliary supply to these equipments. Various alternative sources of auxiliary electrical supply are considered, the advantages and disadvantages of these are compared and proposals are made for high voltage distribution systems around the hydro-electric plant and associated works. Arrangements for DC supply systems and uninterruptable power supply (UPS) systems are also discussed.