For the half-speed low-pressure turbines, the lengths of the last-stage rotating blades can be selected from 41, 46, and 54 in.(60 Hz) to convert thermal energy to kinetic energy more effectively.
The fully three-dimensional blades and long blades boost the efficiency of the turbine system in converting thermal energy to kinetic energy. The integral shroud blades(ISB) enhance the reliability of the turbine system.
The steam flow rate into the turbine with lower-pressure/wet steam is much larger than that for conventional power plants. Long- blade(41-54in.)/half-speed machines are used for nuclear applications.
The stator coils of the generator are cooled with water and the rotor coils are cooled with hydrogen. The generator has a "top hat" structure comprising a hydrogen gas cooler mounted on the frame of the generator. This structure enhances the stability and reliability of the shaft system by reducing the length of the rotor.
The exciter is a brushless type with a long history of service and reputation for easy maintenance. It is driven by the turbine to reduce in-house electricity.
