V52-850 kWPitch regulated wind turbine with OptiTip® and OptiSpeed®

The efficient all-round turbineopens up newopportunitiesThe V52-850 kW turbineimproves exploitation ofwind resources. Vestas hasdone it again. Throughintensive development of theV47-660 kW model, Vestashas succeeded in creating a

new, highly efficient turbine that is ideal for all windconditions.

The Vestas V52-850 kW turbine is a pitch-regulated tur-bine with a 52 metre diameter three bladed rotor. Thespeed of revolution of the rotor can vary from 14.0-31.4 rpm, allowing optimal energy capture at both highand modest wind speeds, while simultaneously ensuringthe best possible power quality.

Vestas OptiSpeed®*The V52-850 kW turbine is fitted with OptiSpeed®, asystem that enables the rotor to operate at variablespeed (RPM) and hereby optimises the aerodynamic efficiency of the rotor. OptiSpeed® is a further develop-ment of the OptiSlip® system, which allowed the rotorspeed to vary by as much as 10%. With OptiSpeed®, therotor speed can now vary by up to approximately 60%.

OptiSpeed® is an efficient solution as the converter onlyconverts the generator rotor energy, which accounts fora small part of the entire energy production of the tur-bine. The energy generated by the generator rotor istransformed back to the electrical grid by means of theconverter.

The use of a converter eliminates the need to consumereactive power from the electricical grid. Nevertheless, it is possible to adjust the turbine to supply or consumereactive power, if appropriate.

In short: OptiSpeed® optimises energy production, especially in modest winds, making it easy to adapt theoperation of the turbine to the parameters of the electri-city grid.

Lower sound level

Sound levels are of crucial importance when decidingon the placement of wind turbines in populated inlandareas – often at locations where wind speeds are low.Thanks to the low speed of revolution of the V52-850 kWturbine in modest wind speeds, Vestas has taken yetanother important step towards fulfilling requirementsfor a wind power solution with a low sound level. TheOptiSpeed® feature makes it possible to program the turbine sound levels before installation so the operationof the turbine is tailormade for the specific character-istics of the chosen location.

Optimal pitch with OptiTip®

As with all other Vestas turbines, the V52-850 kW modelis equipped with microprocessor-controlled OptiTip®

pitch regulation, which ensures continuous and optimaladjustment of the angles of the blades in relation to theprevailing wind. The OptiTip® and OptiSpeed® systemsmake it possible to optimise the solution to the oftencontradictory requirements for high output and lowsound levels, depending on the location.

Lightning protectionNaturally, the V52-850 kW model is equipped with VestasLightning Protection, to protect the entire turbine fromthe tips of the blades to the foundation. The turbinehas, of course, also been thoroughly tested and fullyconforms with the applicable IEC standards.

Proven PerformanceWe spend many months testing and documenting theperformance of the Vestas turbines. When we are finallysatisfied, we run one last check by allowing an independ-ent organisation to verify the results. This is standardpractice at Vestas – a procedure we call ProvenPerformance. It is our guarantee that your Vestas tur-bine meets the very highest requirements for energyproduction, availability factor, power quality and soundlevels.

* Vestas OptiSpeed® is not available in the USA and Canada.

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The figure illustrates the relationship between wind and sound levels aswell as wind and speeds of revolution for turbines equipped with OptiSpeed®.It clearly shows the sound level advantages of lower speeds of revolutionbecause the turbine’s measured sound level at the lowest level is approximately 7 dB(A) lower at 4 m/s than at 8 m/s. For other soundlevels, the advantage is up to 10 dB(A). It should also be noted that adecrease of 3 dB(A) is considered to decrease the sound level by half.

Wind/sound

Sound 100.0 dB(A)Speed of revolution(rpm)

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Ultra-sonic wind sensor

Service crane

VMP-Top controllerwith converter

OptiSpeed® generator

Pitch cylinder

Oil and water coolers

Gearbox

Main shaft

Pitch system

Blade hub

Blade bearing

Blade

Rotor lock system

Hydraulic unit

Torque arm

Machine foundation

Parking brake

Yaw gear

Composite disc coupling

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RotorDiameter: 52 mArea swept: 2,124 m2

Speed of revolution: 26 o/minOperational interval: 14.0-31.4 o/minNumber of blades: 3Power regulation: Pitch/OptiSpeed®

Air brake: Feathered

TowerHub height (approx.):40 m, 44 m, 49 m, 55 m, 60 m, 65 m

Operational dataCut-in wind speed: 4 m/sNominal wind speed: 16 m/sStop wind speed: 25

GeneratorType: Asynchronous with OptiSpeed®

Nominal output: 850 kWOperational data: 50 Hz/60 Hz

690 V

GearboxType: 1 planet step/2-step

parallel axle gears

ControlType: Microprocessor-based monitoring of all

turbine functions as well as OptiSpeed®

output regulation and OptiTip® pitch regulation of the blades.

Weight (IEC IA/IEC IIA)40 m 44 m 49 m 55 m 60 m 65 m

Tower: 39 t/- 44 t/- 50 t/- 57 t/52 t 69 t/- 77 t/-Nacelle: 22 t 22 t 22 t 22 t 22 t 22 tRotor: 10 t 10 t 10 t 10 t 10 t 10 tTotal: 71 t/- 76 t/- 82 t/- 89 t/84 t 101 t/- 109 t/-

The sound output level can be adjusted by varying the speed of revolutionand the pitch angle of the turbine as illustrated in the figure below. Inpractice, this means that the sound level recorded at a distance of 300 m(hub height 49 m), for example, can be reduced from 45.0 to 40.8 dB(A).

V52-850 kW power curves

Wind speed (m/s)100.0 dB(A)103.0 dB(A)

101.0 dB(A)104.2 dB(A)

102.0 dB(A)

Out

put (

kW)

OptiSpeed® allows the speeds of revolution of both the rotor and the generatorto vary by approximately 60%. This reduces fluctuations in the gridsystem as well as minimises the loads on the vital parts of the turbine.

Vestas V52-850 kW with OptiSpeed®

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Good, stable wind conditions are oftenfound in unobstructed areas and close tothe coast. However, there are many com-plex wind sites with high energy productionpotential. In developing the V52-850 kWturbine Vestas has recognized the need tomake better use of the wind in these moredemanding areas.

Vestas OptiSpeed® and the pitch systemreduce the disadvantages of the high and

often unstable winds. Even at times with lowwind, this versatile turbine will still achieveoptimal output, as Vestas OptiSpeed® allowsthe speed of revolution to vary by as muchas 60%.

In addition to this, the V52-850 kW model isdesigned to work with the weak grid condi-tions often found in remote locations.

The V52-850 kW turbine is an all-round turbine that condenses Vestas’ extensiveexperience into a highly efficient turbinedesign. In short, the V52-850 kW model isefficient under all conditions.

Vestas is continuing to strive for excellenceby taking firm steps towards full exploitationof the resources of the wind.

Efficient in all areas

Vestas - Danish Wind Technology A/SSmed Sørensens Vej 16950 RingkøbingDenmarkTel. +45 96 75 25 75Fax +45 97 30 62 50vestas-dwt@vestas.com

Vestas - Scandinavian Wind Technology A/SSmed Sørensens Vej 16950 RingkøbingDenmarkTel. +45 96 75 25 75Fax +45 97 30 62 64vestas-swt@vestas.com

Vestas - International Wind Technology A/SSmed Sørensens Vej 16950 RingkøbingDenmarkTel. +45 96 75 25 75Fax +45 97 30 62 25vestas-int@vestas.com

Vestas - American Wind Technology, Inc.111 SW Columbia Street, Suite 480Portland, OR 97201USATel. +1 503 327 2000Fax +1 503 327 2001vestas-awt@vestas-awt.com

Vestas Deutschland GmbHOtto-Hahn-Strasse 2 - 425813 Husum/NordseeGermanyTel. +49 4841 971 0Fax +49 4841 971 360vestas@vestas.de

Vestasvind Svenska ABÅkarevägen 1731132 FalkenbergSwedenTel. +46 346 713500Fax +46 346 713525info@vestasvind.se

Vestas - Nederland Windtechnologie B.V.Dr. Langemeijerweg 1 aPostbus 63 · 6990 AB RhedenThe NetherlandsTel. +31 264971500Fax +31 264971555vestas@vestas.nl

IWT - Italian Wind Technology S.r.l.Via Ariosto 12 · Zona Industriale74100 TarantoItalyTel. +39 099 4 606 111Fax +39 099 4 606 333vestas@vestas-iwt.it

Vestas - Celtic Wind Technology Ltd.P.O. Box 9263Campbeltown, PA28 6WA, ArgyllScotlandTel. +44 1586 555 000Fax +44 1586 555 111v-celtic@vestas.com

Vestas Hellas Wind Technology S.A.150, A. Papandreou Ave. 2nd Floor165 61 Glyfada, AthensGreeceTel. +30 210 96 46 251Fax +30 210 96 46 252

Vestas France SASLe Millénium – Bâtiment A501, rue Denis Papin34000 MontpellierFranceTel. +33 4 67 202 202Fax +33 4 67 207 899vestas-france@vestas.com

Vestas - Australian Wind Technology Pty. Ltd.33 Coventry Street, SouthbankMelbourne, Victoria 3006AustraliaTel. +61 3 9645 0999Fax +61 3 9645 0111

Beijing Vestas Wind Technology Ltd.29A2, China Merchants Tower, Jianguo Rd.Chaoyang DistrictBeijing 100022ChinaTel: +86 10 65667330 31 32Fax: +86 10 65667335

Vestas - Canadian Wind Technology, Inc.R.R No. 51475 Concession 5Kincardine, OntarioN2Z 2X6CanadaTel. +1 519 396 6922Fax +1 519 396 6158

Vestas RRB India Ltd.189, Sukhdev Vihar New Delhi 110 025IndiaTel. +91 11 26327711Fax +91 11 26327733 vrrb@gndel.global.net.in

Subsidiaries

Associated company

Vestas Wind Systems A/SSmed Sørensens Vej 56950 RingkøbingDenmarkTel. +45 96 75 25 75Fax +45 97 30 24 36vestas@vestas.comwww.vestas.com

Sales companies

Contacts

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Richard Gauld

Balnamoon Switchgear Building

Richard Gauld

Balnamoon Switchgear Building