15,000-Kw. turbo-alternator

DUE TO the increasing use of large single-shaft steam turbine units, it has been necessary to design very large generators operating at 1,800 r.p.m. The present paper describes a 115,000-kw. unit recently placed in operation. The generator is wound for 18,000 volts and the whole output of the machine, with the exception of a small part used for the operation of auxiliaries, is stepped up to 132 kv. All switching is done on the high voltage side of the transformers. Therefore it was possible to design the generator for a voltage that would permit a simple two-conductor per slot winding.