Automatic and supervisory control of hydroelectric stations

W. H. Gerrie: It may be of interest to relate some operating experiences in connection with two such plants as Mr. Smith has described. The plants I refer to are on the Central Ontario System of the Hydro-Electric Power Commission and consist of three generators per plant, the capacity of the units in the one being 2000 kv-a. and in the other 1400 kv-a. Excitation is supplied by direct-connected exciters and control by one regulator of the vibrating type in each plant. The plants are located on a navigable stream, the levels of which are required to be maintained within very close limits. Both plants are controlled from one point and the operator in charge has to operate in addition the plant where he is located, which has a capacity of 9000 kv-a.