Hydrogen Cooled Alternators and Turbines
Powerplant generators and turbine generators above 200MW output are typically filled with hydrogen.
Hydrogen is used to provide a low-drag atmosphere for the armature to rotate in and, because it has a high thermal conductivity, it also assists the cooling of the entire alternator.
It is important to maintain a high hydrogen purity to reduce frictional losses as well as to avoid forming explosive mixtures with air. The graph below illustrates the losses due to increased friction against hydrogen purity. The cost of an explosion is of course immense, as well as being life threatening.
Hitech make both fixed and portable gas analysers for this application and each cover every stage of purging and filling the generator as well as monitoring hydrogen purity in the running machine. They use thermal conductivity sensors which are highly stable and maintenance free. If you are unable to find an appropriate product, please call us on +44 (0)1582 435600 or email us.
The ATEX certified K1650 measures all gas stages in hydrogen cooled turbines and alternators used in power stations. ... view more
The K6050AP measures all gas stages in power station turbines and alternators ... view more