21, rue d’Artois, F-75008 PARIS A1-117 CIGRE 2008 http : //www.cigre.org HYDROGEN / WATER - COOLED TURBOGENERATORS: A MATURE TECHNOLOGY ON THE MOVE R. JOHO* Y. SABATER H. FERRETTO D. ABRAHAM W. FERENS ALSTOM Switzerland France France Germany Poland SUMMARY The decades from 1960 to 1980 brought a tremendous growth of hydrogen/water-cooled turbogenerators, resulting in some 1200 MVA for full-speed two-pole units and 1600 MVA for half- speed four-pole units. This development was mainly driven by the nuclear power generation programs. With the merger of two European manufacturers in 1999, it was decided to continue with the large two-pole line of the one partner and the nuclear four-pole line of the other partner. Possible synergies of the two generator lines were thoroughly examined with the primary goal of increasing reliability and availability. In addition, both series have always been submitted to continuous improvement. Selected examples of related technology improvements will be described. Using the synergies and the continuous improvement the availability of the fleet of large units could be brought up to exceptional high numbers. Both generator lines are currently in uprating of output for power plants beginning operation around 2011-2012. Coal power plants with low-emission technologies are making use of large full-speed turbines, requiring generators up to the 1400 MVA range. Nuclear reactors of the third generation will use half-speed turbine sets requiring generators up to the 2000 MVA range. It is shown how this will be achieved by increase in utilization and by moderate increase in dimensions. Efficiency in power generation has become of utmost importance for caring of the primary energy resources. For the newly developed 2000 MVA generator it will be demonstrated how highest efficiencies can be achieved. The technologies available will also in future allow a potential for uprating. Both generator lines might get further aligned by components, in order to bring their ratings up. Four-pole units will be structured into generator families around different kind of nuclear reactors, for both 50 Hz and 60 Hz, and involving the experienced static excitation, as an option to the well-referenced brushless exciters. By the modular build-up around experienced components the manufacturer will be able to satisfy future customer requirements with a premium performance of the generator. KEYWORDS Turbogenerator, Hydrogen-cooling, Water-cooling, Two-pole generator, Four-pole generator, Design, Development * [email protected]
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21, rue d’Artois, F-75008 PARIS A1-117 CIGRE 2008http : //www.cigre.org
HYDROGEN / WATER - COOLED TURBOGENERATORS:
A MATURE TECHNOLOGY ON THE MOVE
R. JOHO* Y. SABATER H. FERRETTO D. ABRAHAM W. FERENS
ALSTOM
Switzerland France France Germany Poland
SUMMARY
The decades from 1960 to 1980 brought a tremendous growth of hydrogen/water-cooled
turbogenerators, resulting in some 1200 MVA for full-speed two-pole units and 1600 MVA for half-
speed four-pole units. This development was mainly driven by the nuclear power generation programs.
With the merger of two European manufacturers in 1999, it was decided to continue with the large
two-pole line of the one partner and the nuclear four-pole line of the other partner. Possible synergies
of the two generator lines were thoroughly examined with the primary goal of increasing reliability
and availability. In addition, both series have always been submitted to continuous improvement.
Selected examples of related technology improvements will be described. Using the synergies and the
continuous improvement the availability of the fleet of large units could be brought up to exceptional
high numbers.
Both generator lines are currently in uprating of output for power plants beginning operation around
2011-2012. Coal power plants with low-emission technologies are making use of large full-speed
turbines, requiring generators up to the 1400 MVA range. Nuclear reactors of the third generation will
use half-speed turbine sets requiring generators up to the 2000 MVA range. It is shown how this will
be achieved by increase in utilization and by moderate increase in dimensions. Efficiency in power
generation has become of utmost importance for caring of the primary energy resources. For the newly
developed 2000 MVA generator it will be demonstrated how highest efficiencies can be achieved.
The technologies available will also in future allow a potential for uprating. Both generator lines might
get further aligned by components, in order to bring their ratings up. Four-pole units will be structured
into generator families around different kind of nuclear reactors, for both 50 Hz and 60 Hz, and
involving the experienced static excitation, as an option to the well-referenced brushless exciters. By
the modular build-up around experienced components the manufacturer will be able to satisfy future
customer requirements with a premium performance of the generator.