Direct Conductor-Cooling of Large Steam Turbine-Generator 4-Pole Rotors

An increasing number of 4-pole steam turbine-driven generators are being ordered each year by utilities and with steadily increasing unit ratings. This paper discusses rotor cooling for 4-pole generators and shows that gas conductor cooling can be applied to unit sizes far in excess of those now being built. In particular, the radial flow system of cooling, very successfully applied to date, has capability for steam turbine-generator rotor cooling for units forecast for the 1980's.