Hydrogen And Water Cooled Turbo-generators by Bharat Heavy Electricals Limited

The hydrogen and water cooled machines (thdf type) are offered with the stator winding directly water-cooled and the rotor winding directly cooled with hydrogen. The stator core has a leaf spring suspension. The machines are with micalastic system of impregnation and the bearings are mounted on end shields. The stator overhang is with a support ring. A magnetic shunt traps the end leakage flux. These machines are provided with multistage compressors and vertical coolers on turbine end. These can be offered with either brushless /static type of excitation systems

the (thw) type machines have the stator winding directly cooled by water whereas the rotor winding is directly cooled by hydrogen by gap pick up method. The stator core is mounted resiliently on flexible core bars. Resin rich thermo-reactive insulation is used for the stator winding and top ripple springs are placed in the stator slots. These machines are also characterized by enclosed type slip rings with forced ventilation. Two axial fans are provided on rotor and four hydrogen coolers are provided for systematic ventilation. these are offered with static excitation system

the (thri) type machines have the rotor winding/stator winding directly/indirectly cooled by hydrogen respectively. These have micalastic insulation system with end shield mounted bearings. The stator slots are provided with top ripple springs and can be offered with either static/brushless type of excitation systems.