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Siemens Hydrogen-Cooled Generatorswith Water-Cooled Stator WindingsSGen-3000W SeriesOver 600 MVA
siemens.com/energy Answers for energy.
Published by and copyright © 2008:Siemens AGEnergy SectorFreyeslebenstrasse 191058 Erlangen, Germany
Siemens Power Generation, Inc.4400 Alafaya TrailOrlando, FL 32826-2399, USA
For more information, contact our Customer Support Center.Phone: +49 180/524 70 00Fax: +49 180/524 24 71(Charges depending on provider)e-mail: [email protected]
Fossil Power Generation DivisionOrder No. A96001-S90-B158-V1-4A00Printed in GermanyDispo 05400, c4bs No. 1362, 813107960M DA 05083.
Printed on elementary chlorine-free bleached paper.
All rights reserved.Trademarks mentioned in this document are the property of Siemens AG, its affi liates, or their respective owners.
Subject to change without prior notice.The information in this document contains general descriptions of the technical options available, which may not apply in all cases. The required technical options should therefore be specifi ed in the contract.
_SGen_3000W_Series.indd 1_SGen_3000W_Series.indd 1 19.05.2008 15:43:09 Uhr19.05.2008 15:43:09 Uhr
The stator winding uses Vacuum Pressure Impregnation (VPI) technology for the ground wall insulation.
Laminated stator core is cooled directly by hydrogen flowing through axial ventilation paths in the length of the stator core.
A magnetic end shield at each end of the stator core allows rated MVA to 0.95 underexcited (leading) power factor with-out excessive temperatures in the ends of the stator core.
Rotor winding is axially, directly cooled by hydrogen flowing through each turn of the winding.
A Performance Plus™ System hydrogen seal design based on carbon elements has moved the seal technology a revolutionary step forward. A carbon seal ring, which requires much less seal oil, signifi-cantly reduces the required capacity and size of the seal oil system. This technology greatly reduces seal oil contamination in the hydrogen gas and improves emergency seal operating characteristics.
Four vertical independent heat exchangers are used on the turbine drive end of the generator for cooling of the hydrogen.
A single multi-stage blower at the turbine end of the generator circulates the hydrogen gas for cooling of the rotor, stator core and frame components.
Generator frame design enables generators to be installed outdoors.
The stator core is flexibly supported in the outer casing by spring assem-blies. This prevents vibrations at double rotational frequency from impacting the outer casing and thus the foundation tabletop.
The RIGI-FLEX® end-winding support system has been in successful operation since the 1980s. This well-proven bracing system provides rigid-ity to withstand transient fault loads combined with flexibility to withstand normal operation cyclic thermal expansion and contraction, which occurs dur-ing startups and load changes.
Hydrogen-cooled generators with water-cooled stator windings
Siemens offers in its Siemens Generator (SGen™) product line hydrogen-cooled, two-pole generators with water-cooled stator windings. The SGen-3000W series has ratings over 600 MVA for steam turbine and single-shaft steam and gas turbine applications.
Cooling performance is improved by a factor of approximately 14 through the use of hydrogen gas in place of air as the coolant for the rotor winding and stator core. At the same time, frictional losses are significantly lower, thus improving the overall generator efficiency.
An increased output per unit volume of stator-winding active material is possible because of the higher thermal conductivity and specific heat of water. It is this advantage of water that makes it possible to build generators for higher ratings than is possible using air or hydrogen as the cooling medium for the stator winding components.
For over 40 years Siemens has made many detailed improvements to the design of hydrogen-cooled generators with water-cooled stator windings:
Smaller size and therefore reduced space requirements in the turbine building
Higher efficiency
Totally enclosed system minimizes the risk of contamination inside the generator.
Consistent improvement in the design of hydrogen-cooled generators with water-cooled stator windings has brought about operating efficiencies of up to 99%.
A proven modular system enables the production of a wider range of generators by using rotors with different diameters as well as different active body lengths.
The same design philosophies and tools are used in the design of the entire pro-duct line of air-cooled, hydrogen-cooled, and hydrogen-cooled with water-cooled stator winding generators. This means that customers with hydrogen-cooled with water-cooled stator winding generators benefit from the manufacturing and operational advances made to the entire product line of generators.
A design requiring low maintenance in connection with our worldwide service network can result in the highest availability.
Customer benefits
Efficiency up to 99%
Hydrogen seal with carbon elements requires minimal seal oil and has improved emergency operating characteristics
Uniform temperature profile promotes reliability
Suitable for outdoor installation
Simplified installation
Transport dimensions suitable for rail transport in most countries
Design based on field-proven generator component designs
Frequency Model Power factor Apparent power Efficiency Terminal voltage
50 Hz SGen5-3000W 0.85 675 MVA to 940 MVA up to 99% 15 kV to 21 kV
60 Hz SGen6-3000W 0.85 600 MVA to 1,270 MVA up to 99% 16 kV to 27 kV
Technical data
Coolant: Hydrogen gas at 5 to 6 bar Design: In accordance with IEC and IEEE/ANSI standards Thermal classification: Class F insulation system Type of enclosure: IP64 (IEC60034-5); suitable for outdoor installation Excitation: Static or brushless Transport dimensions: Suitable for rail transport in most countries
_SGen_3000W_Series.indd 2_SGen_3000W_Series.indd 2 19.05.2008 15:43:25 Uhr19.05.2008 15:43:25 Uhr
The stator winding uses Vacuum Pressure Impregnation (VPI) technology for the ground wall insulation.
Laminated stator core is cooled directly by hydrogen flowing through axial ventilation paths in the length of the stator core.
A magnetic end shield at each end of the stator core allows rated MVA to 0.95 underexcited (leading) power factor with-out excessive temperatures in the ends of the stator core.
Rotor winding is axially, directly cooled by hydrogen flowing through each turn of the winding.
A Performance Plus™ System hydrogen seal design based on carbon elements has moved the seal technology a revolutionary step forward. A carbon seal ring, which requires much less seal oil, signifi-cantly reduces the required capacity and size of the seal oil system. This technology greatly reduces seal oil contamination in the hydrogen gas and improves emergency seal operating characteristics.
Four vertical independent heat exchangers are used on the turbine drive end of the generator for cooling of the hydrogen.
A single multi-stage blower at the turbine end of the generator circulates the hydrogen gas for cooling of the rotor, stator core and frame components.
Generator frame design enables generators to be installed outdoors.
The stator core is flexibly supported in the outer casing by spring assem-blies. This prevents vibrations at double rotational frequency from impacting the outer casing and thus the foundation tabletop.
The RIGI-FLEX® end-winding support system has been in successful operation since the 1980s. This well-proven bracing system provides rigid-ity to withstand transient fault loads combined with flexibility to withstand normal operation cyclic thermal expansion and contraction, which occurs dur-ing startups and load changes.
Hydrogen-cooled generators with water-cooled stator windings
Siemens offers in its Siemens Generator (SGen™) product line hydrogen-cooled, two-pole generators with water-cooled stator windings. The SGen-3000W series has ratings over 600 MVA for steam turbine and single-shaft steam and gas turbine applications.
Cooling performance is improved by a factor of approximately 14 through the use of hydrogen gas in place of air as the coolant for the rotor winding and stator core. At the same time, frictional losses are significantly lower, thus improving the overall generator efficiency.
An increased output per unit volume of stator-winding active material is possible because of the higher thermal conductivity and specific heat of water. It is this advantage of water that makes it possible to build generators for higher ratings than is possible using air or hydrogen as the cooling medium for the stator winding components.
For over 40 years Siemens has made many detailed improvements to the design of hydrogen-cooled generators with water-cooled stator windings:
Smaller size and therefore reduced space requirements in the turbine building
Higher efficiency
Totally enclosed system minimizes the risk of contamination inside the generator.
Consistent improvement in the design of hydrogen-cooled generators with water-cooled stator windings has brought about operating efficiencies of up to 99%.
A proven modular system enables the production of a wider range of generators by using rotors with different diameters as well as different active body lengths.
The same design philosophies and tools are used in the design of the entire pro-duct line of air-cooled, hydrogen-cooled, and hydrogen-cooled with water-cooled stator winding generators. This means that customers with hydrogen-cooled with water-cooled stator winding generators benefit from the manufacturing and operational advances made to the entire product line of generators.
A design requiring low maintenance in connection with our worldwide service network can result in the highest availability.
Customer benefits
Efficiency up to 99%
Hydrogen seal with carbon elements requires minimal seal oil and has improved emergency operating characteristics
Uniform temperature profile promotes reliability
Suitable for outdoor installation
Simplified installation
Transport dimensions suitable for rail transport in most countries
Design based on field-proven generator component designs
Frequency Model Power factor Apparent power Efficiency Terminal voltage
50 Hz SGen5-3000W 0.85 675 MVA to 940 MVA up to 99% 15 kV to 21 kV
60 Hz SGen6-3000W 0.85 600 MVA to 1,270 MVA up to 99% 16 kV to 27 kV
Technical data
Coolant: Hydrogen gas at 5 to 6 bar Design: In accordance with IEC and IEEE/ANSI standards Thermal classification: Class F insulation system Type of enclosure: IP64 (IEC60034-5); suitable for outdoor installation Excitation: Static or brushless Transport dimensions: Suitable for rail transport in most countries
_SGen_3000W_Series.indd 2_SGen_3000W_Series.indd 2 19.05.2008 15:43:25 Uhr19.05.2008 15:43:25 Uhr
Siemens Hydrogen-Cooled Generatorswith Water-Cooled Stator WindingsSGen-3000W SeriesOver 600 MVA
siemens.com/energy Answers for energy.
Published by and copyright © 2008:Siemens AGEnergy SectorFreyeslebenstrasse 191058 Erlangen, Germany
Siemens Power Generation, Inc.4400 Alafaya TrailOrlando, FL 32826-2399, USA
For more information, contact our Customer Support Center.Phone: +49 180/524 70 00Fax: +49 180/524 24 71(Charges depending on provider)e-mail: [email protected]
Fossil Power Generation DivisionOrder No. A96001-S90-B158-V1-4A00Printed in GermanyDispo 05400, c4bs No. 1362, 813107960M DA 05083.
Printed on elementary chlorine-free bleached paper.
All rights reserved.Trademarks mentioned in this document are the property of Siemens AG, its affi liates, or their respective owners.
Subject to change without prior notice.The information in this document contains general descriptions of the technical options available, which may not apply in all cases. The required technical options should therefore be specifi ed in the contract.
_SGen_3000W_Series.indd 1_SGen_3000W_Series.indd 1 19.05.2008 15:43:09 Uhr19.05.2008 15:43:09 Uhr
