Cooling system for the bushings of an electric generator and method for cooling the bushings of an electric generator

摘要

A cooling system for bushings of an electric generator, which includes a casing housing a stator and a rotor connected to a rotor shaft activating at least a fan defining at least a high pressure zone and a low pressure zone. The generator has a plurality of phases electrically connected to hollow phase rings that are electrically connected to bushings supported by the casing and having cooling circuits to let a cooling medium pass through them to cool them. The outlets of the bushing cooling circuits are housed in the high pressure zone and are connected to inlets of the hollow phase rings. A method for cooling the bushings of an electric generator is also provided.

主权项

1. An electric generator, the generator comprising:
a cooling system for bushings thereof, and a casing for housing a stator and a rotor connected to a rotor shaft activating at least a fan defining at least a high pressure zone and a low pressure zone both divided by a wall, said generator further comprising a plurality of phases electrically connected to hollow phase rings that are electrically connected to bushings supported by the casing, said cooling system including cooling circuits to let a cooling medium to pass through said hollow phase rings to cool them, outlets of the bushing cooling circuits are housed in the high pressure zone and are connected to inlets of the hollow phase rings, wherein the bushing cooling circuits have inlets for the entrance of the cooling medium that are contained inside of the high pressure zone; and first pipes connecting the bushing cooling circuit outlets to the inlets of the hollow phase rings.