A 115,000-kw. Turbo-alternator

The tendency of large steam turbine design toward single-shaft units has greatly increased the size of generators operating at 1,800 r.p.m. Consequently, the designer has had to solve a number of problems, mechanical and electrical, because of the great axial length of these machines and the large weights involved, particularly in the rotor. A new scheme of rotor ventilation and other features of such an alternator are described in this article.