What are the advantages of cooling by hydrogen generators?

The two main advantages of cooling by hydrogen generators are its density is 1/14th of the air and its thermal conductivity is 6.7 times that of the air. These two properties of the hydrogen gas have the following advantages:
·         The noise generated by the alternator is reduced considerably due to the lighter cooling medium and lower friction.
·         Windage losses which are proportional to the density of the cooling medium are drastically reduced.
·         The reliability of the insulation increases and its life span is prolonged.
·         The cooling surface required for Hydrogen cooling is considerably smaller than that needed for the air coolers due to high heat transfer rates
·         There is no possibility of the fire hazard in the machine if the failure occurs in the winding insulation as hydrogen gas does not support combustion. Therefore, there are no needs to incorporate any fire control
·         The usage of hydrogen gas as a cooling medium compared to air permits the machine of the same dimension to have 20% greater output capacity.
·         The corona effects on the conductors in the windings are less harmful in hydrogen atmosphere compared to air.
Due to numerous advantages offered by the hydrogen cooling, it is universally accepted better cooling medium for high capacity generating units

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