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Safe way to use Hydrogen for cooling generators

Hydrogen and not Air is used in Large generators for cooling. Do you know why?
Larger generators produced more heat and also introduce windage losses caused by 
wind resistance and friction on the generator shaft.
Hydrogen has a thermal conductivity much higher than air and  a much lower 
viscosity than air. 
Hydrogen is safe to use and won't support combustion if you can maintain its purity above 90%. Also as the concentration of Hydrogen as a coolant increases the cooling efficiency of the generator also increases.
During startup Air is replaced with CO2 and then CO2 is replaced with Hydrogen in a way to ensure Air is not in direct contact with Hydrogen. And during maintenance the reverse is followed to fill it with Air for safe working of personnel.
Thermal conductivity analyzers are available to monitor the concentrations of Hydrogen and CO2 in Air to enable efficient and quicker Startup, Shutdown and Maintenance operations.
Happy Reading.

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