Abridgment of the 220,000-volt system of the hydo-electric power commission of Ontario

Power requirements of the Commission´s 25-cycle Niagara System are outlined. Preliminary studies in connection with the choice of transmission voltage, location of terminal transformer station, etc., are discussed, together with the technical studies involved in the design of a system for transmitting 260,000 hp. 230 miles at 220,000-volts, and transforming same at the receiving end, for interconnection with the existing 110,000-volt system. The Toronto-Leaside 220,000-volt transformer station is described, together with the 220,000-volt transmission system. The paper concludes with a résumé of operating experience on the 220,000-volt system to date, and an outline of the future development of the system as at present anticipated.