Control system design for generating stations

D-C control system design for generating stations built on the “unit” principle is discussed from the standpoint of segregation, reliability, and continuity. Localization of the d-c control circuit and an interposing 48-volt direct-wire supervisory system minimizes failure while retaining local control for emergency operation because of loss of control panels, circuits, or other central control room equipment From the Fall of 1951 to the middle of 1961, Consolidated Edison has added seven turbine — generators, which total 1,870 mw, to its system. There are presently in various stages of construction, four more units totaling 1,230 mw of additional capacity, with service dates to the Fall of 1963. Each of these units is, or will be, designed on the “unit” principle, that is, each unit is, or will be, completely independent of its neighbor in any of the generating stations in which it is located.