WWD-1 1 MW wind turbine

Appendix 10 Technical specification 1 (18) WWD-1 1 MW wind turbine Technical specification

Appendix 10 Technical specification 2 (18) Contents 1. General... 3 2. Tower... 6 3. Rotor... 6 4. 3-RR main bearing (three row cylinder bearing)... 7 5. Planetary gear... 7 6. Lubrication... 8 7. Generator... 8 8. Brake system... 8 9. Hydraulic system... 9 10. Glassfiber cover... 10 11. Yaw system... 10 12. Foundation... 11 13. Grid connection... 11 14. Turbine control, remote monitoring and reporting... 12 14.1. Reporting... 12 14.2. Transformation of production data into other information systems (optional)... 13 14.3. Presenting the production data on the Internet (optional)... 14 14.4. Remote control... 14 14.5. Alarms... 15 15. Self-diagnostic of the wind turbine... 15 16. Lightning protection... 15 17. Anti-icing of blades... 16 18. Aviation lights... 16 19. Maximum temperatures... 16 20. Power curve... 17 Information of this document is subject to change without notice. WinWinD is a registered trademark of WinWinD Oy. This document contains general information about WWD-1 wind turbines. The exact scope of delivery shall is defined in Contents of the Delivery Date Revision Author Remark Aug 2003 8/2003 Eku Document update Aug 2003 8-1/2003 EKu Dimensions updated Nov 2003 8-2/200 EKu Updated

Appendix 10 Technical specification 3 (18) 1. General WinWinD has developed an innovative wind turbine for the market with its WWD concept. WinWinD s basic values include customer satisfaction and the operational reliability of the products, as well as the win-win cooperation achieved between the clients and WinWinD. On the basis of thorough technical and economic research work the WWD concept, which allows electricity to be produced with a new innovative integrated power unit, was created. The basis for design was efficiency, reliability and ease of maintenance which allows the WWD concept to offer the most cost-effective production throughout its total life, combined with the lowest operating costs. The drive train of the WWD-1 wind turbine consists of a single-stage planetary gear and a low-speed synchronous generator. This Multibrid -concept combines the reliability of a direct drive and the compactness of a gear system. Low rotational speed together with precise dimensioning ensures reliability. The solution is suitable for a weak grid and also enables operation in a stand-alone mode. Low maintenance costs are also benefits of the WWD-concept. The maintenance is designed so that the production stops are minimized. This means, in practice, that all the maintenance is done on-site without expensive equipment. The used components have exceptional long maintenance cycle, which decreases maintenance costs as well. General Power control Rated power Rotor diameter Cut-in wind speed Rated wind speed Cut-out wind speed Design maximum Rotor speed Generator speed Rotor weight 3 blades, 4 degree tilt, up-wind Pitch, variable speed 1000 kw 60 meter 3,0 m/s 12,5 m/s 20,0 m/s 59,5 m/s (at hub height) 7,7-25,6 rpm 44-146 rpm 20 000 kg

Appendix 10 Technical specification 4 (18) Nacelle weight 36 000 kg Colour of tower and nacelle RAL 7035 grey Colour of tower and nacelle RAL 7035 grey Classification IEC III, -7,5 m/s, 20 years (60 m) Operating temperature -10...+ 35 ºC Certification Germanischer Lloyd will certify the WWD-1 wind turbine. The rotor is combined to the power unit using a custom-made three-row roller bearing (1). The roller bearing transfers the rotor loads directly to the main casing past the planetary gear and generator. The single-stage planetary gear (2) has a planetary carrier that runs with the rotor. The planetary carrier runs the planet gears, which pass the power to the sun gear increasing the rotating speed ratio 5,71, that is, to 44-146 rpm. The low speed generator (3) produces the electricity, which is conveyed to the frequency converter. The direction and speed of the wind are measured by the anemometer and wind vane on the cooler. On the basis of the information of the wind vane, the drive train is turned using the yaw motor so that the blades face upwind. The rotational speed is controlled by three independent electric pitches (4).

Appendix 10 Technical specification 5 (18)

Appendix 10 Technical specification 6 (18) 2. Tower Hub height 56 m 66 m Tower length 53,5 m 63,5 m Number of sections 2 3 Weight 68 000 kg 90 000 kg Colour RAL 7035 RAL 7035 3. Rotor The rotor consists of three blades, hub and three electrical pitches. The blades are made of epoxy resin reinforced glassfibre. The blades also act as aerodynamic brakes. Normally the blades are synchronised but in case of an emergency each blade can be controlled individually. The pitch system is electric and equipped with a back-up battery. The blades are equipped with lightning conductors. Rotor main data Rotor diameter 56 m / 60 m Swept area 2463 m 2 / 2826 m 2 Rated tip speed 75.6 m/s Specific power 406 W/m2 Rotor speed 7.7 25.6 rpm Rotor tilt 4 degrees Rotor cone angle 0 Tip s distance from the tower 4.56 m Hub Metso Foundry (or a second source) Spherical graphite cast iron Material GJS-400-18 ULT Blades EUROS GmbH (or a second source) Material Epoxy resin reinforced glassfibre Weight About 3300 kg (60 m version)

Appendix 10 Technical specification 7 (18) Profile Total length Surface area Cross sections Colour Lightning protection NACA / TUDELFT 27.4 m (56 m version) About 40 m2 (56 m version) 2.40 / 1.48 m RAL 7035 grey Integrated lightning conductors Power control (pitch) Blade bearing Gearing Maximum speed Electrically synchronised pitch, in case of an emergency independent pitch for each blade SSB GmbH (or a second source) 2-ballbearing HRE (or a second source) 3-stage planetary gear Bonfiglioli (or a second source) 20 degrees/s 4. 3-RR main bearing (three row cylinder bearing) The main bearing is integrated to the hub and the supporting power unit. The bearing is lubricated with oil and protected against weather. The double lip seal is filled with grease. 3-RR bearing Material Weight Hoesch-Rothe-Erde (or a second source) Ball races 42 CrMo 4 V Roller races 100 Cr 6 About 1350 kg 5. Planetary gear Planetary gear Metso Drives 1-stage, PL-540, helical gear Cooling Oil circulation and cooler Ratio 1:5.71

Appendix 10 Technical specification 8 (18) Lubrication Oil type Oil change Forced lubrication VG320 Annual check, change when needed 6. Lubrication Hydraulic system Oil type Cooling Heating Hydac Oy (or a second source) VG320 Separate cooler Electric resistor 7. Generator Generator Cooling Rated power Rated voltage Insulation category Protection category Grid connection ABB Helsinki AMG 1120SE20 DSEB Water jacket 1057 kw 660 V (internal voltage) F Inside IP23, IP56 in general Via IGBT-inverter 8. Brake system Each rotor blade independently acts as an aerodynamic brake. The computer controls the system with the help of the anemometer and wind vane. The stop procedures are: The normal stop: the blades are synchronised and they are adjusted to the stop position 5 degrees/s without using any mechanical brakes.

Appendix 10 Technical specification 9 (18) The fast stop: the blades are adjusted to the stop position 15 degrees/s without using any mechanical brakes. The emergency stop: the blades are adjusted to the stop position with the speed of about 20 degrees/s using the battery power. The mechanical brakes are used at the same time. Each blade can be independently adjusted to the stop position. Each blade is equipped with a back-up battery. If one of the blade pitches fails, the synchronisation is turned off and each blade is driven separately to the storm position using the back-up battery. The system meets the standards of Germanischer Lloyd. The standard does not require the mechanical brakes but that improves security and is used for locking the rotor during maintenance. Aerodynamic brake Activation 3 individual blade pitch Electric Mechanical brake Active hydraulic disc brake Number 2 Antec (or a second source) Location Behind the rotor, on the fast side Disc material S355 J2G3 9. Hydraulic system Hydraulic system Hydac (or a second source) Hydraulic fluid VG 50 Heating Electric resistor

Appendix 10 Technical specification 10 (18) 10. Glassfiber cover Hub cover Material Colour Kuitunikkarit (or a second source) Sandwich glassfiber RAL 7035 grey 11. Yaw system The wind vane on the roof of the drive train continuously monitors the direction of the wind. The wind vane is equipped with an anti-icing system. When the direction of the wind changes, two geared yaw motors on top of the tower (at the yaw bearing level) turn on and the hydraulic brakes are loosened automatically. Yaw bearing HRE (or a second source) One row prestressed ball bearing Material 42 CrMo 4, balls 100 CR 6 Yaw gearing Bonfiglioli (or a second source) 4-stage planetary gear Number 2 Yaw speed 0,75 degrees/s Yaw motor Rated power Protection Speed Asynchronous motor 2,2 kw IP54 940 r/min Yaw brakes Antec (or a second source) Prestressed, active Number 6

Appendix 10 Technical specification 11 (18) 12. Foundation The foundation is a massive solid slab foundation laid either on ground or on pile foundation depending on the local ground conditions. The tower shall be connected to the foundation by cylindrical flange or ground bolts. 13. Grid connection WinWinD wind turbine is monitored by a programmable, digital central control system, which analyses and controls the electricity production according to the digital data, provided by the sensors. An IGBT inverter is used for connecting to the grid. The inverter is connected to an transformer either outside or inside the foundation. The voltage level of the electricity fed to the grid is either 10 kv or 20 kv and the frequency either 50 Hz or 60Hz depending on the grid. Monitoring Connecting equipment Main frame Grid connection MITA Systems MITA WP3000 Microprocessors in parallel IGBT AC inverter AC inverter ABB (or a second source) 4 quadrant IGBT frequency converter Power ab. 1400 kva Supply voltage 690 V (+ 10% / -15%) Supply mains frequency 48-63 Hz Water cooled Minimum requirements of the transformer Power 1100 kva Rated voltage 690 V Low-loss Static Screen More information is available on document WWD-1 grid connection description

Appendix 10 Technical specification 12 (18) 14. Turbine control, remote monitoring and reporting WinWinD wind turbines can be connected to remote monitoring system using an ISDN connection or an analogue telephone line. It is possible to use a GSM connection, too, if there are no landlines available. 14.1. Reporting The remote control can be used for diverse monitoring of the functions of the wind turbine, e.g., basic data, (daily, weekly, monthly or annual) production and the status of different functions. Example of the basic data: In addition, the system gathers diverse data on production and functions. The following figure is an example of a daily power production report.

Appendix 10 Technical specification 13 (18) The graphic user interface is user-friendly and the outputs are clear. The following information, for example, is available real time: Information on production and wind Temperatures Currents, voltages and power data Rotational speed The diagrammatic presentations and drawings include Daily, monthly and annual production The production data of the latest 24 hours at 10 minute intervals Log events The production data can be printed. Mita-modules needed: Mita Basic dongle 14.2. Transformation of production data into other information systems (optional) The production data can be automatically retrieved from the wind turbine to the control room at fixed intervals. The data can then be converted to, for example, Excel or Access format. It is possible to produce an ASCII text file, as well.

Appendix 10 Technical specification 14 (18) This enables the client to make use of the diverse production data of the wind turbine in their own systems. Mita-modules needed: Mita Basic dongle Mita AutoCall (to fetch information from turbines to office)) 14.3. Presenting the production data on the Internet (optional) The system enables presenting the production data of the wind turbines on the Internet. Access to the data can be free or a username with password can be used. Thus the production data can be viewed regardless of the place or time; the Internet-connection, however, is a necessity. In addition, the client can upload the production data onto their own computer in Excel format, which makes further reporting smooth. WinWinD modules needed: WinWinD Internet-based wind park production www- service 14.4. Remote control Wind turbine can be remote controlled. Settings of the main frame can be changed also remotely. The wind turbine can be started and stopped using the remote control, too. Mita-modules needed: Mita Basic dongle

Appendix 10 Technical specification 15 (18) Mita Remote Display 14.5. Alarms In case of a malfunction the system alarms and informs the central control room or any pre-programmed telephone number of the need for repair. The alarm can also be forwarded from the central control room to the maintenance personnel using either an SMS or e-mail (optional). Mita-modules needed: Mita Basic dongle (to receive the alarm call) Mita Auto Alarm Dispatch (for e-mail) WinWinD modules needed: From E-mail to SMS - module 15. Self-diagnostic of the wind turbine The wind turbine is equipped with an automatic monitoring system, which continuously protects and controls the generator and the grid and adjusts the settings according to the wind and weather conditions. This way the power production can be optimised. During the cold season the sensors measure the need for heating of the power unit and lubrication oil and ensure a safe start. For case of a grid drop the wind turbine has an uninterruptible power system (UPS), which ensures the control for 3 minutes. The anemometer and wind vane of the wind turbine monitor the changes in the wind and the technique starts and stops the plant according to the settings. 16. Lightning protection The most advanced lightning protection technology in the field is used. The following principles are applied Lightning conductor in each blade Varistors and fuses in the connector casing of the generator Varistors and fuses on the connectors of the inverter

Appendix 10 Technical specification 16 (18) Protected sensor cables Overvoltage protection on the high voltage side of the transformer Earthing of the tower according to the VDE 0185 standard The functioning of the varistors and fuses signalled to the control computer 17. Anti-icing of blades Anti-icing of the blades is not in use. 18. Aviation lights Light intensity 10 cd *) Battery back-up (in case of grid failure) no of light fixed Light colour red GPS-synchronisation no Amount of lights per turbine 1 unit (consist of tens of leds) of the lamps led *) ICAO (International Civil Aviation Organization) defines minimum requirements for obstacle lights: ICAO A, low-intensity, fixed red light: Minimum intensity 10 cd at +6 and +10 elevation angles, Vertical beam spread 10 19. Maximum temperatures When having +35 ºC or smaller outside temperature at hub height the production capacity is according the power curve. When having more than +35 ºC outside temperature at hub height, the production capacity depends on temperature and wind speed. In some conditions, maximum power shall be temporarily limited.

Appendix 10 Technical specification 17 (18) 20. Power curve Below is presented the calculated power curve with rotor diameter of 56 m and 60 m. (Air density 1.225 kg/m3) The following values are for WWD-1 / 56 m rotor v (m/s) Ct Ce 1 0,81 0,000 2 0,81 0,000 3 0,81 0,228 4 0,81 0,322 5 0,81 0,380 6 0,81 0,408 7 0,81 0,413 8 0,81 0,418 9 0,81 0,419 10 0,76 0,419 11 0,70 0,401 12 0,57 0,378 13 0,41 0,305 14 0,32 0,244 15 0,25 0,199 16 0,21 0,164 17 0,17 0,136 18 0,14 0,115 19 0,12 0,098 20 0,11 0,084 21 0,09 0,072 22 0,08 0,063 23 0,07 0,055 24 0,06 0,048 25 0,06 0,042

Ver 3/2002 Technical specification 18 (18)