TN 535 WIND TURBINE GENERAL DESCRIPTION
Contents
1. TN 535 WIND TURBINE GENERAL DESCRIPTION Author Checked Approved Tozzi D Spago G Cimatti e sua sns wind turbines CONFIDENTIAL Passing on and copying of this document use and communication of its TN 1 1 47 Pages All rights reserved content are not permitted without prior written authorization 20 Tozzi Nord TN 535 GENERAL DESCRIPTION REVISIONS M Bonsignori TABLE OF CONTENTS 1 INTRODUCGTION 5 1 1 PURPOSE OF THE DOCUMENT rettet genae entra d eee ee redet 5 1 2 APPLICATION DOMAIN bees s ctr hene Pert epa e di aie T asss 5 13 REFERENCE DOCUMENTS rein ER ee xe eta ree E EE Eu 5 14 LIST OF ABBREVIATIONS AND L nennen nnns 6 2 7 2 1 ENVIRONMENTAL CONDITIONS 7 211 Cold ClhMate tact 8 2 12 Wind farm influence ite Ee tree ae RO eee haa har 8 2 1 3 Complex terraln u uy su uu ug tiet C tu rue Eb ED aa e aee Pt uc EO ER dO 8 22 USE RR 8 3 TECHNICAL DESCRIPTION 9 3 1 TN 535 Arehitect reuuu EE 9 3 2 Electrical system u u uuu 92. c M 20 Company Confidential TN 11 47 3 INDEX OF PICTURES Figure 1 Tozzi Nord TN 535 wind t rbi es U UU 9 Figure 2 Operating range of the TN 535 14 INDEX OF TABLES Table 1 Reference 5 Table 2 List of abbreviations and 6 Table 3 Summary of environmental conditions for which TN535 is 7 Table 4 Definition of important pitch 11 Company Confidential TN 11 47 4 Tozzi WIND TURBINES TRENTINO ITALIA TN 535 GENERAL DESCRIPTION 1 INTRODUCTION 1 4 PURPOSE OF THE DOCUMENT This document provides a General Description of the TN 535 WEC The document is organized as follows Chapter 2 describes limitations of the TN 535 WEC 1 2 APPLICATION DOMAIN This document is applicable to TN 535 WEC designed manufactured by Tozzi Nord 1 3 REFERENCE DOCUMENTS Chapter 3 provides a short technical description of the TN 535 WEC Chapter 4 describes the operation of the TN 535 WEC Chapter 1 the present chapter describes the
3. CE Iro asb 10 3 4 POWER TRANSMISSION ena retta tenue anemia ess 10 3 5 GENERATOR reto tet ie bete ster ein t er a EE an e eee tae ped 10 9 0 YAW SYSTEM itte a P te ED P Re n OR d ra ear re DR ES 10 MEE saa 10 362 Cable unWindingu LL U u 10 TOWER 2 11 Company Confidential TN 11 47 2 3 8 SYSTEM 2 11 3 9 eeniemc4qmsm ARES 11 u rien 11 es AME Picee Ono u eT 11 310 SAFETY SYSTEM uuu ET 12 3 10 1 Safety relevant sensors and measurements 12 KP MEESICUUESSDHLIGRS ED 12 3 10 3 Not safety relevant Enn Eo RE Een eau Enna RAKAR 13 34 The Brake System oi 5 foie a eben reb atte oe re Rr re be doe dos 13 3 11 1 Electrical Brake System L A U L ea eaa 13 3 11 2 Mechanical Brake System I 13 3 12 PROTECTION OF THE ELECTRICAL POWERL_LINE a 13 3 13 LIGHTENING PROTEGT QN inire ei ie se
4. or if the present rotary speed in the waiting position exceeds 20 rpm the turbine switches from status waiting to the status start up The status start up has the following sequences Startup the inverters e Accelerated the rotor speed along a ramp up to 20 rpm by pitching the blades e Wait at 20 rom for the acknowledgment of the inverters e f the ok of the inverters does not arrive within 10 s the machine goes into and inverter fault condition and tries after 2 minutes again This is done 5 times before a fault condition is signalled to the maintainer e f the ok of the inverters arrives within 10 s the status is switched to power production the inverters are activated and the rotor speed is accelerated along a ramp by pitching the blades to the optimal pitch position of 2 4 2 3 Power Production There are two different situations in the power production of the turbine e Below rated wind speed e Above rated wind speed Below the rated wind speed the machine is working in the optimal pitch angle The rotor speed is controlled by the generator torque to let the blades work in the point of maximum efficiency means the rotor speed is almost linear to the wind speed The power production grows more or less with the 3 power of the wind speed Above the nominal wind speed the turbine controls the rotor speed by pitching the blades try to keep the nominal rotor speed Because the turbine is connected by an inverter to the grid
5. 00 2 Ref 1 all environmental conditions for which TN535 is designed are summarized in the table below Wind conditions SWT Class IV Reference wind speed Vref 30 0 10 min average hub height recurrence time 50 years Annual average wind speed Vave 6 0 m s turbulence intensity level at 15m s l5 018 H dimensionless slope parameter a 2 0 to be used for the calculation of standard deviation turbulence as a function of Vnu and hs expected extreme wind speed Veso 42 0 m s 3 sec average hub height recurrence time 50 years expected extreme wind speed Ve 315 m s averaged over 3 s recurrence time 1 years design wind speed 8 4 m s Other Environmental conditions Normal temperature range 10 lt T lt 40 Relative humidity of the air lt 95 H Airdensityp 1 225 kg m Solar radiation 1000 W m Lightening protection system electric scheme described in Ref 4 Ref 5 Ref 6 Atmospheric content equivalent to that of a non polluted inland atmosphere see IEC 60721 2 1 Earthquake model TN535 standard towers and foundations are verified according to Decreto Ministeriale 14 01 2008 Testo Unitario Norme Tecniche per le Costruzioni 8 seismic class Il Electrical network conditions Normal supply voltage and range 400 1096 V Normal supply frequency and range 503 Hz Table 3 Summary of environ
6. 5 Company Confidential TN 11 47 8 1o22 Ord TN535GENERAL DESCRIPTION 3 TECHNICAL DESCRIPTION The Tozzi Nord TN 535 is a wind energy converter with a three bladed rotor active pitch control and variable speed operation with a rated power of 9 9 kW With its rotor diameter of 13 2 m and tower height of 15 or 18 or 24 m the TN 535 efficiently makes use of the prevailing wind conditions at its respective operating sites to generate electrical energy Figure 1 Tozzi Nord 535 wind turbines The main focus for development and design of all Tozzi Nord products is the idea to optimize the energy production even at low wind speed and minimizing the loads Power control with variable speed allows the TN 535 to operate with optimum efficiency in the entire operation field and avoid undesirable power spikes Therefore guaranteeing good energy yield and high quality power fed to the grid The active pitch control reduces the loads on the structure especially at high wind sppeds Please refers to Appendix A for further details concerning the TN 535 WEC 3 1 TN 535 ARCHITECTURE The TN 535 is a 3 bladed pitch controlled wind turbine It is designed for full variable speed using full power inverters for the grid connection The rotor runs upwind 3 2 ELECTRICAL SYSTEM OVERVIEW Please refers to the schematics in Appendix B Company Confidential TN 11 47 9 TN 535 GENERAL DESCRIPTION 3 3 ROTOR The rotor has
7. ATION 2 H EOLIC ELECTRI LINEA QUADS 1 ISTRIBUZIONE CLIENTE pziorah richiesta cliente t tedhzzd26ore entes IMPIANTO DI TERRA GROUND GROUND CIRCUIT Company Confidential TN 11 47 19 Tozzi Nord TN 535 GENERAL DESCRIPTION WIND TURBINES TRENTINO ITALIA APPENDIX C DESIGN LOAD CASE ACCORDING TO IEC 61400 2 COMING UP BY THE DIFFERENT FAULTS Load Rotor speed sensor 1 broken B Normal shut down give a warning inegligible High vibration of generator support iduring braking down can happen Generator short circuit Normal shut down iwhen asymetric sort circuit below 10 irpm avoided by short circuit over all 3 Internal faults Normal operation Manuel shut down Company Confidential TN 11 47 20
8. acelle 3 12 PROTECTION OF THE ELECTRICAL POWER LINE The electric power line is mainly protected by the control logic of the static converter against following faults e Generator short circuit to ground Generator short circuit phase to phase e Short circuit in the cables between generator and inverter e Inverter faults Grid failure 3 13 LIGHTENING PROTECTION Please refers to TN 535 Lightening Protection document Ref 7 Company Confidential TN 11 47 13 TN 535 GENERAL DESCRIPTION 4 OPERATING THE TN 535 WEC This paragraph describes the main operating conditions of the TN 535 WEC For a more detailed information please refers to the User Manual Ref 3 41 CONTROL LEVELS OF THE TN 535 4 1 1 The user usually the customer of the machine is the person who has read and understood the instructions of use expressed in the User Manual Wind turbine model TN535 Ref 3 He has access to the first level On this level is an OPERATION MODE SELECTOR SWITCH and the MAIN SWITCH The OPERATION MODE SELECTOR SWITCH has three positions Level 1 access for the user 1 OFF The WEC is completely off it does not pitch nor yaw 2 Standby The WEC is off it does not pitch but still align to the wind 3 Auto The WEC is in automatic operation normal position of the switch The behaviour of the WEC is descript in next paragraphs Any time the switch is moved out of the position Auto the turbine goes into braking positio
9. ages e Maintenance free e Higher friction than a roller bearing which supports the yaw brakes The yaw brake is built up with two brakes loaded by compression springs The brakes are constantly acting means they brake also when the machine is yawing The yaw drive is an asynchronous three phase motor 400 Vac with a flanged reduction gear The gear is greased for live time means it is maintenance free The torque of the motor is transmitted by a chain drive to the yaw bearing The max torque of the drive is higher than the friction torque of the brakes and the yaw bearing 3 6 1 Cinematism The yaw bearing is mounted directly to the top of the tower using a geared ring and a slewing ring bearing Two adjustment drives yaw drives turn the nacelle out of the wind with the geared ring The weight of the nacelle is also transferred via this yaw bearing into the tower The main carrier is attached directly to the yaw bearing 3 6 2 Cable unwinding The sensors for the cable twist are switches connected to the yaw ring Changes in the nacelle position are converted to electric signals for the control system Company Confidential TN 11 47 10 TN 535 GENERAL DESCRIPTION 3 7 TOWER The TN 535 is sold with a 16 sides polygonal tubular steel tower built in two sections It is available in heights of 14 6m 17 6m e 23 6m 3 8 PITCH SYSTEM The TN 535 is equipped with a collective pitch system controlled by the PLC The pitch drive c
10. ctive pitch control and active yaw control Clockwise seen from upwind 3 13 2m 15 18 24m 9 9 kw Active pitch pitch to feather 2 5 m s 16 m s 6 7 m s 13 2m 136 7 m LWTB535 6 344 m GFRP Optional Rigid no tilt belt drive Single row ball bearing 225 750 rpm 20 66 rpm ABB ACS M1 11 0 kVA Permanent Magnets Synchronous Generator 8 poles IP54 F Company Confidential TN 11 47 17 Yaw System Yaw Type Yaw Rate Controller Type Remote monitoring UPS Breaking System Aerodynamic brake Redundant aerodynamic brake Rotor lock Tower tower height tower type Design wind class Weights Nacelle excluding rotor and hub rotor including hub Tower Noise emissions Max Lwa 10m s Active yaw control 1 driver 2 beaks always braking 3 35 deg s PLC Tozzi Nord SCADA Real Time Viewer Backup by means fo lead acid batteries 2X12V Collective pitch Passive centrifugal system that bring blades to barking position Metal pin inserted for maintenance 14 6m 17 6 m 23 6 m polygonal steel tower 16 sides 2 sections IV 783 kg 332 kg 1300kg 14 6m 1750kg 17 6m 3350kg 23 6m 87 1dB Company Confidential 11 47 18 Tozzi Nord TN 535 GENERAL DESCRIPTION APPENDIX B TN535 UNIFILAR SCHEMATIC UNIFILARE ESSIONE ALLA RETE IMPIANTO DI POTENZA kw 2 TNS3 H1 ARMADIO ELETTRICO EOLI AR DIAGRAM CONNECTION TO THE NETWORK SUPPLY POWER INSTALL
11. ein en eae 13 4 OPERATING THE TN 535 WEC a 14 4 1 CONTROL LEVELS OF THE TN 5395 ua ettet assays 14 4 1 1 Level 1 access tor the operator tisnin 14 4 1 2 Level 2 access for the skilled people 14 4 2 NORMAL OPERATING OF THE TN 535 14 421 Idling at Low Wind 15 4202 Start ede uqa Ge ee 15 423 Power Production ites tere ene eden assess dele cent 15 4 23 MC m 15 4 2 5 Normal Shut Down because of Low Wind sse nennen nennen nnne nen 15 4 2 6 High Wind Conditions einigen ien ee Eco reda esas ce d eder nce den 16 4 2 7 Shut down because of a fault condition enne 16 4 2 8 Manual ae lee a Gi Se I ee ae 16 429 Emergency in Operation treten ener tenure ncmo cbe noni terrea ie ea ann cs 16 4 240 Emergency In Service ise o eed n BL eden 16 APPENDIX A TN535 17 APPENDIX B TN535 UNIFILAR SCHEMATIC enims 19 APPENDIX C DESIGN LOAD CASE ACCORDING TO IEC 61400 2 COMING UP BY DIPFERENT FAUDTS u
12. mental conditions for which TN535 is designed For sites with environmental conditions outside of the design conditions TN cannot be held responsible for any defects including but not limited to damages and or loss of energy yield Company Confidential TN 11 47 y 2 1 1 Cold climate Standard machine is rated and tested for temperature range included between 10C and 40C At maximum temperature is possible an automatic and temporary power derating according with cycle of the power and other environmental condition like insulation or wind Moving over or below these limit not represent risk of injuries The product can be equipped for extended temperature range with several options heater and or insulation additional ventilation different greases According to customer need and site characteristic right configuration is implemented 2 1 2 Wind farm influence Loading of wind turbines is calculated for a single wind turbine In general Tozzi Nord recommend that wind turbines are placed in distances of at least 5 rotor diameters 2 1 3 Complex terrain Loading of wind turbines is calculated for a non complex terrain Standard machine is rated for 1000m above sea level For use over this altitude customer has to contact TN for quantify losses in performance and eventually application limit 2 2 PROPER USE The machine can be used in all the conditions specifically described in the User Manual of the product Ref 3 section A
13. n by pitching the blades Furthermore the MAIN SWITCH cuts off the electricity coming from the grid to the WEC and the opposite s way 4 1 2 Level 2 access for the skilled people only This level is used only for service and outstands from the purpose of the present document 42 NORMAL OPERATING OF THE 535 The figure below shows the operating range of the TN 535 The controller keeps the machine always inside the allowed envelope All start up and brake down procedures are performed automatically 120 100 High wind conditions Nominal Power 1 I 80 I s a 60 Power production of the WEK s s E z a0 Sm conditions z io 20 WEK ideling 5 ee lt io 0 0 0 2 0 4 0 6 0 8 0 10 0 12 0 1440 160 180 200 220 240 V_wind m s Figure 2 Operating range of the TN 535 Company Confidential TN 11 47 14 Tozzi Nord TN 535 GENERAL DESCRIPTION WIND TURBINES TRENTINO ITALIA 4 2 1 Idling at Low Wind Conditions If the wind is not strong enough for energy production the turbine switches into the status waiting pitching the blades to an angle of approximately 36 3 s witch off the inverters The rotor is then idling with about 2 5 over m s of wind speed The yaw system is aligning the nacelle to the wind whenever necessary 4 2 2 Start up If the average rotary speed in the waiting position exceeds during 100 seconds 11 rpm
14. onsists of a linear drive run by a brushless DC motor It is feed through the 28 VDC BUS of the machine In case of grid failure the DC BUS has a backup battery The high speed of the pitch drive allows the blade angle to be quickly and precisely adjusted according to the prevailing wind conditions Actual TN535 setup consider an optimum root pitch of 13 3 a waiting root pitch of 36 3 and a parki ng root pitch of 87 4 5 c c E 5 8 3 E Nominal pitch 2 0 250 76 1 deg Tip pitch 0 5 23 5 74 6 deg root pitch at r 1500mm reference for this document Table 4 Definition of important pitch angles 3 9 CONTROL SYSTEM The TN 535 control system is based on an industrial PLC which constantly monitors the sensors of the various components as well as e g the data of wind direction and wind speed and in return adapts the operation of the TN 535 accordingly This is done by optimizing the rotor speed the blade angle the yaw position of the nacelle and the power output of the generator accordingly During operation all relevant sensors are constantly monitored in order to initiate the appropriate measures e g parking or emergency stop in case an irregularity occur 3 9 1 Yaw control The wind vane at hub height continuously detects the wind direction If the average deviation of the nacelle direction compared to the measured wind direction is greater than a certain quantity
15. purpose of the document and its application domain TITLE CODE RELEASE Ref 1 Wind turbines Part 2 Design requirements for small Second edition wind turbines IEC 611002 2006 07 Ref 2 Electrical apparatus for explosive atmospheres IEV426 03 02 _ Areas and zones Ref 3 TN 535 User Manual TN535 1_MU_en 01 Ref 4 Electrical diagram of TN 535 WT control amp power 60002 1 _ cabinet Ref 5 Electrical diagram of TN 535 WT nacelle cabinet 60010 1 Ref 6 Electrical diagram of TN 535 WT nacelle wiring 60021 1 _ diagram Ref 7 TN 535 Lightening Protection TN11 48 A Table 1 Reference documents Company Confidential TN 11 47 Tozzi Nord TN 535 GENERAL DESCRIPTION WIND TURBINES TRENTINO ITALIA 1 4 LIST OF ABBREVIATIONS AND DEFINITIONS Abbreviation Definition WT Wind Turbine WEC Wind Energy Converter HW HardWare SW SoftWare PLC Programmable Logic Controller IEC International Electrotechnical Commission IEV International Electrotechnical Vocabulary DLC Design Load Case Table 2 List of abbreviations and definitions Company Confidential TN 11 47 6 Tozzi Nord TN 535 GENERAL DESCRIPTION WIND TURBINES TRENTINO ITALIA 2 LIMITATIONS This chapter describes the limitations to use the TN 535 WEC 2 1 ENVIRONMENTAL CONDITIONS TN535 is designed to withstand standard SWT Class IV as defined in section 6 of CEI IEC 614
16. r is stopped by pitching the blades into the parking position of about 87 4 In this position the machine is idling with about 0 6 P ms The yaw is still aligning the nacelle to the wind whenever necessary 4 2 8 Manual Stop The TN 535 can be stopped manually by switching the OPERATION MODE SELECTOR SWITCH out of the position Auto The turbine goes into parking position by pitching the blades 4 2 9 Emergency in operation If any anomalous condition is detected the machine can be switched off through the OPERATION MODE SELECTOR SWITCH In case of fire the machine should also be switched be switched off from the external main through the MAIN SWITCH 4 2 10 Emergency in service During service operation all the actuator and the voltage in nacelle can be switched off pressing one of the EMERGENCY BUTTON one in nacelle and one inside the control cabinet Company Confidential TN 11 47 16 APPENDIX A TN535 SPECIFICATIONS Turbine Architecture Type Direction of rotation Number of blades Rotor diameter Hub height Nominal electric power Power regulation Cut in wind speed Cut out wind speed Nominal output at Rotor diameter Swept area Rotor Type Blade length Material Lightening protection Hub Drive train Transmission Main bearing High speed shaft rotational speed Low speed shaft rotational speed Grid feed Generator Nominal power Type Protection Insulation class Upwind rotor with a
17. rs cause a warnings Hereafter a list of not relevant sensors e Wind vane broken or iced checked continuously Generator temperature checked continuously for unreliable values cause by short circuit or broken cable 3 11 THE BRAKE SYSTEM The TN 535 brakes always aerodynamically by collective pitching the three blades There are two independent actuator systems working on the pitch mechanism of the three blades The main actuator is electrically driven the emergency actuator is a completely independent mechanical system 3 11 1 Electrical Brake System The electrical system uses an electrical linear actuator working on all three blades by a mechanical system The electric power is coming from the 28 VDC BUS feed by a power supply feed from the grid A backup battery is always kept charged and its capacity is tested monthly by the controller 3 11 2 Mechanical Brake System The mechanical emergency system is triggered by centrifugal force when the electrical system is not working anymore and the machine goes into an rotor over speed The energy to move the pitch system is coming from the rotating rotor The system is designed to have ten times the power of the electrical system The high power of the emergency system gives the assurance that it is able pitch the blades into the braking position even then the electrical actuator was not able any more The emergency system has to be rested by hand means a skilled person has to climb the n
18. sly for unreliable values cause by short circuit or broken cable e Voltage level of 28 VDC checked continuously e Battery voltage level checked monthly and after each start up out of the braking position e Battery capacity checked monthly and after each start up out of the braking position e slipping checked continuously by comparing rotor speed and generator speed e Yaw sensor 1 checked when passing the maker right sequence with yaw sensor 2 e Yaw sensor 2 checked when passing the maker right sequence with yaw sensor 1 e Yaw time checked by a timer Sensor pitch drive braking position checked when moving to braking position by a timer Sensor pitch drive waiting position checked when moving to waiting position by a timer Sensor pitch drive working position checked when moving to working position by a timer 3 10 2 Status signals If a status signal is missing or the value is wrong the machine is stopped in a normal braking procedure by pitching the blades into braking position e Inverter status checked continuously e Status of 28 VDC grid supply switch checked continuously Status of 28 VDC sensors switch checked continuously e Grid failure checked continuously e Grid monitoring interface checked continuously e Yaw motor protection checked continuously Company Confidential TN 11 47 12 TN 535 GENERAL DESCRIPTION 3 10 3 Not safety relevant sensors Not safety relevant senso
19. the nacelle is repositioned by means of the yaw motor Yaw motion is monitored by counting the rotations of the yaw motor and by checking the yaw time for plausibility 3 9 2 Pitch control When the maximum rotor speed limit is reached the blade angles are changed accordingly to keep it constant To achieve this the appropriate blade angle is selected by evaluating the speed and acceleration measurements Company Confidential TN 11 47 11 3 10 SAFETY SYSTEM The safety system of the TN 535 is designed to keep the wind turbine under safe condition in all cases mentioned in the norm IEC 61400 2 Ref 1 To control the machine and guaranty its safety the values are monitored continuously by the PLC Appendix C shows the load case according to IEC 61400 2 Ref 1 coming up by the different faults There are three types of sensors or status monitored e Safety relevant sensors e Status signals from switches and inverters e Not safety relevant sensors 3 10 1 Safety relevant sensors and measurements The safety relevant sensors are continuously checked for reliable values These sensors stop the machine in a normal braking procedure by pitching the blades into braking position whenever the value is out of the threshold or not reliable e Rotor speed sensors 1 checked continuously by comparing with rotor sensor 2 e Rotor speed sensors 2 checked continuously by comparing with rotor sensor 1 e Vibration sensor checked continuou
20. the system is soft and the rotor speed can vary a little bit around the nominal rotor speed In the last the power is all the time at nominal power 4 2 4 Yawing The TN 535 has an active yaw system A wind vane measures the relative wind direction according to the WEC and an special algorithm controls the yaw drive in a way that it does not move to often but keeps the WEC aligned to the prevalent wind direction In case of a broken wind vane or one of its cables the PLC doesn t yaw anymore and gives out the warning wind vane broken In case of blowing wind and the signal of the wind vane is not changing for a certain period the PLC doesn t yaw anymore and gives out the warning wind vane not moving 4 2 5 Normal Shut Down because of Low Wind When in the status Power the rotary speed drops below 25 rpm in the average over 30 seconds or when it drops below 8 rpm the system returns to the status waiting by pitching the blades to 36 35 Company Confidential TN 11 47 15 TN 535 GENERAL DESCRIPTION 4 2 6 High Wind Conditions In the event of wind speeds over 16 m s average over 480 sec or maximum gusts over 22 m s the turbine stops down by pitching the blades to the parking position 87 4 pitch angle The PLC decides when th e wind has fallen sufficiently for a return to the production state 4 2 7 Shut down because of a fault condition Most of the faults causes a normal shut down of the machine means the roto
21. three blades made out of glass reinforced epoxy resin The blades are directly fixed to the blade bearings which allow pitching of the blades The TN 535 has a collective pitch driven by an electrical linear drive or in redundancy by a mechanical system 3 4 POWER TRANSMISSION The torque produced by the rotor is transmitted directly to the big wheel of the belt drive without load the main shaft with any torsion The belt gear has a transmission ratio of 1 11 4 and transmit the power to a PMSG Permanent Magnet Generator with a nominal speed of 750 rpm The belt drive train adopted in the TN 535 is key point of the proposed WT In fact with respect to other WT fitted with traditional gearbox train one have e Greater efficiency due to minor losses especially partial load Minor maintenance costs for example oil changes are no longer necessary High temperature range without change in the efficiency Noiseless Acts as a safety friction coupling in case of the generator short circuit 3 5 GENERATOR The TN 535 WT adopts a PMSG with a nominal speed of 750 rpm driven by the turbine rotor by means of the belt drive train The generator provides its rated power already at a rotor speed of 66 rpm The copper windings are fitted with an isolation class F for 155 C 3 6 YAW SYSTEM The Yaw system is built up by the three elements yaw bearing yaw brake and yaw drive The yaw bearing is built up as a sliding bearing This has different advant
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