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AAC-25 - BAC-50 - Gen-Aux - Fast Degas CO2 Evaporator
Hydrogen is used to cool large stationary generators because of hydrogen’s high heat capacity and low density. The hydrogen must be kept dry in order to maintain these properties. Ambient moisture is considered a contaminant which will reduce the heat capacity and increase the density of the cooling gas. Moisture has also been linked to two other major problems. The first is the formation of stress corrosion cracks in the generator retaining rings. The rapid propagation of these cracks has, in several instances, resulted in catastrophic failure. The second problem, while less serious, is still a concern. A reaction between the lead solder used in the innercooler, carbon dioxide, and the moisture in the generator has formed lead carbonate, a highly conductive compound detrimental to generator windings and operation. |
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