Cooling system should be provided in the generator or alternator to remove the heat generated in the windings (I2R loss) of the generator. Inability to remove the heat results in damage to the winding insulation of the generator and can lead to reduction in the life span of the generator. Natural air cooling and forced air cooling is provided for the small rating generators.
However for the generators rated above 60MW the amount heat generated will be enormous and air cooling is insufficient to cool the generator. Therefore hydrogen cooling is employed to remove the heat generated. Hydrogen cooling is chosen because of few characteristics of the hydrogen gas. Along with hydrogen cooling water cooling is provided in the stator winding circuit for large generators
Advantages of Hydrogen cooling:
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