POWER

the solid investment for the future

GIGATOP 4-poleHydrogen and water-cooled turbogenerator

A robust productAlstom’s close co-operation with nuclear power plant operators means that wehave unique feedback from operational experience of the installed GIGATOP 4-poleunits. This enables us to continuously improve the product design and thetechnology that goes into it to adapt to changing market requirements.

Unrivalled efficiencyAlstom’s GIGATOP 4-pole is the most efficient 4-pole turbogenerator for thenuclear market. This is largely the result of its optimised cooling systems. The statorwinding is water cooled, while the rotor and stator core are directly hydrogencooled. At the same time, the efficient hydrogen sealing system maintains highhydrogen purity, which sustains the equipment’s efficiency over long operationalperiods.

Ease of transportation and installationThe GIGATOP 4-pole turbogenerator is designed for rail and road transport,making delivery much easier and smoother. The stator is transported withinthe casing as a single unit, so cleanliness of the core is ensured during transport.The result is that only a small number of individual, separately packaged piecesare transported, which considerably speeds up installation time and brings youon power and making revenue more rapidly.

Easy to maintainThe inner parts of the machine are easily accessible, making maintenance mucheasier. For example, the stator end winding can be re-tightened during a majoroverhaul, quickly and simply. Also, the cooling tubes are made of stainless steelinstead of copper, so there is no risk of corrosion and clogging from copper oxides.This adds to the reliability of operation.

02 03

In today’s competitive power market, nuclear power plants need to operateat maximum performance and availability.

GIGATOP 4-pole is the most efficient 4-pole turbogenerator for the nuclearmarket, making it a solid long-term investment.

GIGATOP 4-pole, the turbogenerator behind Alstom’s proprietary ARABELLE™steam turbine, sets the benchmark for reliability and efficiency. Covering anoutput range from 900 MW to 2,000 MW, in both 50 and 60 Hz markets,the world largest turbogenerators in operation today are GIGATOP 4-pole,with a power output of 1,550 MW.

Alstom is the world’s most experienced turbogenerator supplier for nuclearapplication, with worldwide operational experience since the 1960s.About one third of the world’s nuclear fleet are today equipped with Alstomturbogenerators. Recent orders include Flamanville 3 in France,and Hong Yan He in China as well as orders from UniStar in the USA.

Whatever your needs, Alstom has the solution.

Right technology, right productsThe Alstom Turbomachines group (TMG) designs, manufactures,markets and commissions the key equipment that is at the heart ofpower plants, namely:T Gas turbinesT Steam turbinesT Steam turbines retrofit and integrated retrofit solutionsT Conventional islands for nuclear power plantsT Turbogenerators

Alstom has more than 100 years’ experience in designing and manufacturing turbogenerators.Our pioneering work includes the world’s first turbogenerator in 1898, the first 2-pole turbogeneratorin 1901 and the invention of the Roebel bar in 1912. We have a comprehensive range of productsand retrofit solutions, from 40 to 2,000 MW in 50/60 Hz markets, covering all applications for bothAlstom and non-Alstom turbines.

GIGATOP 4-pole: the benefits

GIGATOP 4-poleYour nuclear solution

A robust productAlstom’s close co-operation with nuclear power plant operators means that wehave unique feedback from operational experience of the installed GIGATOP 4-poleunits. This enables us to continuously improve the product design and thetechnology that goes into it to adapt to changing market requirements.

Unrivalled efficiencyAlstom’s GIGATOP 4-pole is the most efficient 4-pole turbogenerator for thenuclear market. This is largely the result of its optimised cooling systems. The statorwinding is water cooled, while the rotor and stator core are directly hydrogencooled. At the same time, the efficient hydrogen sealing system maintains highhydrogen purity, which sustains the equipment’s efficiency over long operationalperiods.

Ease of transportation and installationThe GIGATOP 4-pole turbogenerator is designed for rail and road transport,making delivery much easier and smoother. The stator is transported withinthe casing as a single unit, so cleanliness of the core is ensured during transport.The result is that only a small number of individual, separately packaged piecesare transported, which considerably speeds up installation time and brings youon power and making revenue more rapidly.

Easy to maintainThe inner parts of the machine are easily accessible, making maintenance mucheasier. For example, the stator end winding can be re-tightened during a majoroverhaul, quickly and simply. Also, the cooling tubes are made of stainless steelinstead of copper, so there is no risk of corrosion and clogging from copper oxides.This adds to the reliability of operation.

02 03

In today’s competitive power market, nuclear power plants need to operateat maximum performance and availability.

GIGATOP 4-pole is the most efficient 4-pole turbogenerator for the nuclearmarket, making it a solid long-term investment.

GIGATOP 4-pole, the turbogenerator behind Alstom’s proprietary ARABELLE™steam turbine, sets the benchmark for reliability and efficiency. Covering anoutput range from 900 MW to 2,000 MW, in both 50 and 60 Hz markets,the world largest turbogenerators in operation today are GIGATOP 4-pole,with a power output of 1,550 MW.

Alstom is the world’s most experienced turbogenerator supplier for nuclearapplication, with worldwide operational experience since the 1960s.About one third of the world’s nuclear fleet are today equipped with Alstomturbogenerators. Recent orders include Flamanville 3 in France,and Hong Yan He in China as well as orders from UniStar in the USA.

Whatever your needs, Alstom has the solution.

Right technology, right productsThe Alstom Turbomachines group (TMG) designs, manufactures,markets and commissions the key equipment that is at the heart ofpower plants, namely:T Gas turbinesT Steam turbinesT Steam turbines retrofit and integrated retrofit solutionsT Conventional islands for nuclear power plantsT Turbogenerators

Alstom has more than 100 years’ experience in designing and manufacturing turbogenerators.Our pioneering work includes the world’s first turbogenerator in 1898, the first 2-pole turbogeneratorin 1901 and the invention of the Roebel bar in 1912. We have a comprehensive range of productsand retrofit solutions, from 40 to 2,000 MW in 50/60 Hz markets, covering all applications for bothAlstom and non-Alstom turbines.

GIGATOP 4-pole: the benefits

GIGATOP 4-poleYour nuclear solution

04 05

GIGATOP 4-pole: designed to perform

Water-cooling system in the stator windingThe water-cooling system in the stator winding is designed to deliver the highest reliability. De-ionised waterflows through the stainless-steel cooling tubes to remove the heat dissipated by the stator winding. Thecorrosion-resistant nature of stainless steel ensures that there is no clogging within the cooling tubes, whateverthe water quality, so that losses are minimised and efficiency enhanced. The tubes themselves are welded towater clips located at both ends of each bar, next to the brazed lugs. The electrical and cooling circuits aretherefore kept separate, further improving reliability.

Stator end-winding support structureThis truly unique design feature reduces the maintenance effortand increases availability of the GIGATOP 4-pole. It is axiallyflexible to allow thermal expansion, and rigid in the radial andtangential directions to withstand high electromagnetic forces.The end-winding can be re-tightened easily during a majoroverhaul, which accelerates maintenance operations.

Hydrogen sealing systemAlstom has gone the extra mile with the safety of the GIGATOP4-pole, by designing a triple-circuit hydrogen sealing system.This ensures very low hydrogen consumption, which also helpsto reduce operational costs. It also maintains the hydrogen atvery high purity levels, meaning that the GIGATOP 4-pole’soutstanding efficiency is sustained over the long term.

MICADUR® insulation systemOne of the key features to boost the reliability of the GIGATOP4-pole is Alstom’s MICADUR® insulation system, the resultof continuous development that started in the 1950s.The insulation consists of a glass-fibre tape incorporating micaflakes. The taped bars are vacuum-impregnated with a solvent-free epoxy resin and thermally cured. The surface is finallycoated with a corona-protection varnish. MICADUR® meetsall the requirements of thermal class F (155ºC), whileGIGATOP 4-pole operates in thermal class B (130ºC), meaningthat it has an intrinsic safety margin for reliable operation. TheMICADUR® insulation system exhibits outstanding mechanicaland electrical properties, resulting in excellent long-term durabilityunder all operating conditions.

Accessibility for inspection and maintenanceThe special Alstom design ensures fast and easy access to the stator and rotor components to speed upthe maintenance process and add to the remarkable availability of the GIGATOP 4-pole. For example, the rotor can beremoved without disassembling the end casing.For the 50 Hz market, the GIGATOP 4-pole comes complete with an Alstom unique brushless excitation system.This makes it maintenance-free, since there is no longer any need to change brushes. It also leadsto a more compact design, so the hall length can be much shorter than conventional designs.

04 05

GIGATOP 4-pole: designed to perform

Water-cooling system in the stator windingThe water-cooling system in the stator winding is designed to deliver the highest reliability. De-ionised waterflows through the stainless-steel cooling tubes to remove the heat dissipated by the stator winding. Thecorrosion-resistant nature of stainless steel ensures that there is no clogging within the cooling tubes, whateverthe water quality, so that losses are minimised and efficiency enhanced. The tubes themselves are welded towater clips located at both ends of each bar, next to the brazed lugs. The electrical and cooling circuits aretherefore kept separate, further improving reliability.

Stator end-winding support structureThis truly unique design feature reduces the maintenance effortand increases availability of the GIGATOP 4-pole. It is axiallyflexible to allow thermal expansion, and rigid in the radial andtangential directions to withstand high electromagnetic forces.The end-winding can be re-tightened easily during a majoroverhaul, which accelerates maintenance operations.

Hydrogen sealing systemAlstom has gone the extra mile with the safety of the GIGATOP4-pole, by designing a triple-circuit hydrogen sealing system.This ensures very low hydrogen consumption, which also helpsto reduce operational costs. It also maintains the hydrogen atvery high purity levels, meaning that the GIGATOP 4-pole’soutstanding efficiency is sustained over the long term.

MICADUR® insulation systemOne of the key features to boost the reliability of the GIGATOP4-pole is Alstom’s MICADUR® insulation system, the resultof continuous development that started in the 1950s.The insulation consists of a glass-fibre tape incorporating micaflakes. The taped bars are vacuum-impregnated with a solvent-free epoxy resin and thermally cured. The surface is finallycoated with a corona-protection varnish. MICADUR® meetsall the requirements of thermal class F (155ºC), whileGIGATOP 4-pole operates in thermal class B (130ºC), meaningthat it has an intrinsic safety margin for reliable operation. TheMICADUR® insulation system exhibits outstanding mechanicaland electrical properties, resulting in excellent long-term durabilityunder all operating conditions.

Accessibility for inspection and maintenanceThe special Alstom design ensures fast and easy access to the stator and rotor components to speed upthe maintenance process and add to the remarkable availability of the GIGATOP 4-pole. For example, the rotor can beremoved without disassembling the end casing.For the 50 Hz market, the GIGATOP 4-pole comes complete with an Alstom unique brushless excitation system.This makes it maintenance-free, since there is no longer any need to change brushes. It also leadsto a more compact design, so the hall length can be much shorter than conventional designs.

06 07

GIGATOP 4-pole: a success story

Flamanville 3 / FRANCEAlstom breaking its own recordThe nuclear power plant startedcommercial operation in 1985 withtwo 1,350 MW units. Alstomdesigned, delivered and erected theturbine-generator package,plus the bulk of the turbine islandmechanical and electrical auxiliaries.A power plant extension is now underconstruction. It will include anadditional ARABELLETM 1750 steamturbine and a GIGATOP 4-poleturbogenerator delivering 1,750 MW.When commissioned in 2012, this willbe the highest output in the worldfrom a single turbine-generatorpackage. Alstom will design, deliverand erect the complete turbine islandfor Flamanville 3.

EPR projectsfor UniStar / USANuclear renaissance in North AmericaAlstom is supporting UniStar NuclearEnergy to strengthen its position asa leader in the US nuclear renaissance.Alstom is to supply Baltimore-basedUniStar Nuclear Energy with a minimumof 4 turbine-generator packages fora planned fleet of advanced-designnuclear power plants in the UnitedStates. The target for completion of thefirst power plant is end 2015.

Oskarshamn 3 / SWEDENPlant asset optimisation with integratedretrofitAlstom is carrying out an integratedretrofit project at Oskarshamn 3,whose power output is being up-ratedfrom 1,200 MW to 1,450 MW.The complete electrical system is beingupgraded with a new GIGATOP 4-poleturbogenerator, together with new orupgraded auxiliaries, to provide a fullyintegrated retrofit solution. This projectdemonstrates Alstom’s competence inlarge complex nuclear plantmodernisation programmes.

Ling Ao & Hong Yan He /CHINARecent successes in ChinaAlstom designed, delivered andsupervised the erection of thecomplete integrated turbine island atLing Ao I (2 x 990 MW). A power plantextension is now under construction.It includes two additional ARABELLETM

1000 steam turbines, with twoGIGATOP 4-pole turbogenerator, eachdelivering 1,080 MW.Alstom will also supply 4 x 1,000 MW-class steam turbine-generator packagesfor the conventional island of a newnuclear power plant to be built atHong Yan He, in close co-operationwith local manufacturers. The ordercomprises an ARABELLETM steamturbine, a GIGATOP 4-poleturbogenerator, a condenserand moisture separator/ reheaters.

Alstom Power,a world leader in power generationAlstom is a global leader in power generation designed tomeet the needs of customers and end users across the world.For over 100 years, Alstom has been helping to satisfy thegrowing need for electricity.Today, we deliver power generation solutions in over70 countries. Our innovative, environmentally-friendlytechnologies have made Alstom a by-word for efficiency,reliability and performance.

Alstom Power R&DAlstom Power R&D focuses on creating innovativetechnologies to be applied at all stages of a product’s lifecycle. We aim for the best utilisation of the customers’investment, the earth’s materials and the fuel used, throughefficiency, availability and cost reduction.Across over 20 development centres and more than10 laboratories worldwide, Alstom R&D activities focus mainlyon the improvement of plant performance and efficiency andon the reduction of environmental impact.

Quality manufacturingAlstom’s 100-year manufacturing experience gives customersspecial advantages. Our worldwide plant network, allISO 9001/14001 certified, ensures that high qualitystandards are consistently met through continuous qualityimprovement initiatives. A key focus area of our R&D effort isnew manufacturing technology and processes. Laser cuttingof core laminations as well as automatic stator bar and rotorcoil manufacturing are some of the innovative methods thatkeep us at the technology forefront.

In accordance with IEC and ANSI/IEEE standards, everyturbogenerator is subjected to a series of tests over andabove the material and manufacturing checks.

Extensive service experienceThrough our 200 Local Service Centres in 70 countries, youhave direct access to Alstom Power Service’s full range ofmaintenance and emergency repair services.Our services include performance improvement, lifetimeextensions and consultancy packages for Alstom and otherOEM turbogenerators. Alstom can also advise you on theeconomics and risks associated with different maintenance andrepair strategies.Upgrades offer a very economic opportunity to benefit fromAlstom’s latest technology. Various upgrade packages havebeen developed to match your operating strategy. Increasedpower output, improved operational flexibility or reliability arethe major aims of an upgrade.

Alstom service packages to re-wind and repair majorcomponents, coupled with new design techniques and modernmaterials, help improve plant performance.

Alstom’s long-term service contracts will meet your uniquerequirements. You can choose from traditional Purchase OrderContracts, Service Agreements, and Operations andMaintenance Contracts.

Ling Ao, China

With global operational experience since 1960, Alstom has the world’s largest turbogeneratorin operation today, with an output of 1,550 MW.

06 07

GIGATOP 4-pole: a success story

Flamanville 3 / FRANCEAlstom breaking its own recordThe nuclear power plant startedcommercial operation in 1985 withtwo 1,350 MW units. Alstomdesigned, delivered and erected theturbine-generator package,plus the bulk of the turbine islandmechanical and electrical auxiliaries.A power plant extension is now underconstruction. It will include anadditional ARABELLETM 1750 steamturbine and a GIGATOP 4-poleturbogenerator delivering 1,750 MW.When commissioned in 2012, this willbe the highest output in the worldfrom a single turbine-generatorpackage. Alstom will design, deliverand erect the complete turbine islandfor Flamanville 3.

EPR projectsfor UniStar / USANuclear renaissance in North AmericaAlstom is supporting UniStar NuclearEnergy to strengthen its position asa leader in the US nuclear renaissance.Alstom is to supply Baltimore-basedUniStar Nuclear Energy with a minimumof 4 turbine-generator packages fora planned fleet of advanced-designnuclear power plants in the UnitedStates. The target for completion of thefirst power plant is end 2015.

Oskarshamn 3 / SWEDENPlant asset optimisation with integratedretrofitAlstom is carrying out an integratedretrofit project at Oskarshamn 3,whose power output is being up-ratedfrom 1,200 MW to 1,450 MW.The complete electrical system is beingupgraded with a new GIGATOP 4-poleturbogenerator, together with new orupgraded auxiliaries, to provide a fullyintegrated retrofit solution. This projectdemonstrates Alstom’s competence inlarge complex nuclear plantmodernisation programmes.

Ling Ao & Hong Yan He /CHINARecent successes in ChinaAlstom designed, delivered andsupervised the erection of thecomplete integrated turbine island atLing Ao I (2 x 990 MW). A power plantextension is now under construction.It includes two additional ARABELLETM

1000 steam turbines, with twoGIGATOP 4-pole turbogenerator, eachdelivering 1,080 MW.Alstom will also supply 4 x 1,000 MW-class steam turbine-generator packagesfor the conventional island of a newnuclear power plant to be built atHong Yan He, in close co-operationwith local manufacturers. The ordercomprises an ARABELLETM steamturbine, a GIGATOP 4-poleturbogenerator, a condenserand moisture separator/ reheaters.

Alstom Power,a world leader in power generationAlstom is a global leader in power generation designed tomeet the needs of customers and end users across the world.For over 100 years, Alstom has been helping to satisfy thegrowing need for electricity.Today, we deliver power generation solutions in over70 countries. Our innovative, environmentally-friendlytechnologies have made Alstom a by-word for efficiency,reliability and performance.

Alstom Power R&DAlstom Power R&D focuses on creating innovativetechnologies to be applied at all stages of a product’s lifecycle. We aim for the best utilisation of the customers’investment, the earth’s materials and the fuel used, throughefficiency, availability and cost reduction.Across over 20 development centres and more than10 laboratories worldwide, Alstom R&D activities focus mainlyon the improvement of plant performance and efficiency andon the reduction of environmental impact.

Quality manufacturingAlstom’s 100-year manufacturing experience gives customersspecial advantages. Our worldwide plant network, allISO 9001/14001 certified, ensures that high qualitystandards are consistently met through continuous qualityimprovement initiatives. A key focus area of our R&D effort isnew manufacturing technology and processes. Laser cuttingof core laminations as well as automatic stator bar and rotorcoil manufacturing are some of the innovative methods thatkeep us at the technology forefront.

In accordance with IEC and ANSI/IEEE standards, everyturbogenerator is subjected to a series of tests over andabove the material and manufacturing checks.

Extensive service experienceThrough our 200 Local Service Centres in 70 countries, youhave direct access to Alstom Power Service’s full range ofmaintenance and emergency repair services.Our services include performance improvement, lifetimeextensions and consultancy packages for Alstom and otherOEM turbogenerators. Alstom can also advise you on theeconomics and risks associated with different maintenance andrepair strategies.Upgrades offer a very economic opportunity to benefit fromAlstom’s latest technology. Various upgrade packages havebeen developed to match your operating strategy. Increasedpower output, improved operational flexibility or reliability arethe major aims of an upgrade.

Alstom service packages to re-wind and repair majorcomponents, coupled with new design techniques and modernmaterials, help improve plant performance.

Alstom’s long-term service contracts will meet your uniquerequirements. You can choose from traditional Purchase OrderContracts, Service Agreements, and Operations andMaintenance Contracts.

Ling Ao, China

With global operational experience since 1960, Alstom has the world’s largest turbogeneratorin operation today, with an output of 1,550 MW.

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