COOLING SYSTEM FOR THE BUSHINGS OF AN ELECTRIC GENERATOR AND METHOD FOR COOLING THE BUSHINGS OF AN ELECTRIC GENERATOR

摘要

The invention refers to a cooling system for the bushings (12) of an electric generator (1) that comprises a casing (2) housing a stator (3) and a rotor (4) connected to a rotor shaft (5) activating at least a fan (6) defining at least a high pressure zone (9) and a low pressure zone (8). The generator (1) has a plurality of phases electrically connected to hollow phase rings (11) that are electrically connected to bushings (12) supported by the casing (2) and having cooling circuits (22) to let a cooling medium (17) pass through them to cool them. The outlets (24) of the bushing cooling circuits (22) are housed in the high pressure zone (9) and are connected to inlets (32) of the hollow phase rings (11). The invention also refers to a method for cooling the bushings of an electric generator.