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How dangerous are wind turbines in cold climate regions? Can we do something about it?

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How dangerous are wind turbines in cold climate regions? Can we do something about it?

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Presentation by Bengt Göransson, Pöyry at Winterwind 2012. "How dangerous are wind turbines in cold climate regions? Can we do something about it?"

Presentation by Bengt Göransson, Pöyry at Winterwind 2012. "How dangerous are wind turbines in cold climate regions? Can we do something about it?"

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How dangerous are wind turbines in cold climate regions? Can we do something about it?

  1. 1. HOW DANGEROUS ARE WIND TURBINES IN COLD CLIMATE AND CAN WE DO SOMETHING ABOUT IT? Winterwind, Skellefteå 8 February 2012 Bengt Göransson, Pöyry SwedPower
  2. 2. ARE WIND TURBINES DANGEROUS? COPYRIGHT©PÖYRY PÖYRY POWERPOINT 2010 TEMPLATE 2 17 JANUARY 2012
  3. 3. HAZARDS IN COLD CLIMATE •  Ice throw •  Noise increase •  Slipping •  Trapping •  Freezing COPYRIGHT©PÖYRY PÖYRY POWERPOINT 2010 TEMPLATE 3 17 JANUARY 2012
  4. 4. THE MACHINERY DIRECTIVE SAYS… ”Machinery must be designed and constructed so that it….can be operated, adjusted and maintained without putting persons at risk” 4 | WINTERWIND 2011 | 2011-02-09 COPYRIGHT©PÖYRY PÖYRY POWERPOINT 2010 TEMPLATE 4 17 JANUARY 2012
  5. 5. RISK Risk = probability of a hazard x consequence of failure COPYRIGHT©PÖYRY PÖYRY POWERPOINT 2010 TEMPLATE 5 17 JANUARY 2012
  6. 6. EN 50308 REVISION BY CENELEC COPYRIGHT©PÖYRY PÖYRY POWERPOINT 2010 TEMPLATE 6 17 JANUARY 2012
  7. 7. PROCEDURE FOR RISK ASSESSMENT ACCORDING TO MACHINERY DIRECTIVE 1 Determine the limits of the machinery 2 Identify the hazards 3 Estimate the risks 4 Evaluate possible design solutions 5 Eliminate the hazard or reduce the risks 6 Inform about residual hazards COPYRIGHT©PÖYRY PÖYRY POWERPOINT 2010 TEMPLATE 7 17 JANUARY 2012
  8. 8. PROBABILITY OF ICE SHEDDING Distance from tower Ice throw probability/m2/year with 5 icing days Turbine in operation COPYRIGHT©PÖYRY PÖYRY POWERPOINT 2010 TEMPLATE 8 17 JANUARY 2012
  9. 9. PROBABILITY OF ICE SHEDDING Ice throw probability/m2/year with 5 icing days Turbine at standstill COPYRIGHT©PÖYRY PÖYRY POWERPOINT 2010 TEMPLATE 9 17 JANUARY 2012
  10. 10. CASES Service staff Public Icing Winter season occurrence Rotating Parked turbine turbine COPYRIGHT©PÖYRY PÖYRY POWERPOINT 2010 TEMPLATE 10 17 JANUARY 2012
  11. 11. RISK LEVELS AT 5 ”ICE DAYS” ANNUALLY WITH ICE In operation Case Service staff Recurrence time Parked car 1 hr / 20 m 27 years Driving by row of turbines for 7 5800 years min Person staying 1 hr/10 m 530 years COPYRIGHT©PÖYRY PÖYRY POWERPOINT 2010 TEMPLATE 11 17 JANUARY 2012
  12. 12. WINTER SEASON (6 MONTHS) In operation Case Public Recurrence time Person 1hr/10 m 1,3 million years Person 1hr/50 m 53 million years Person 1 hr/100 m 143 million years Parked Case Public Recurrence time Person 1hr/10 m 19000 years Person 1 hr/50 m 230000 years Person 1 hr/100 m - COPYRIGHT©PÖYRY PÖYRY POWERPOINT 2010 TEMPLATE 12 17 JANUARY 2012
  13. 13. ARE THESE FIGURES HIGH RISK OR LOW RISK? •  For public: Risk of being hit by lightning in the US during one year is 7 times staying 50 m from turbine for 1 hour during winter season Risk of being hit by ice cone in Stockholm city street equals staying 10 m for 1 hour during winter season •  Risk for service staff: Risk for personal injury in traffic 4 times staying 1 hour 10 m from turbine at icing condition COPYRIGHT©PÖYRY PÖYRY POWERPOINT 2010 TEMPLATE 13 17 JANUARY 2012
  14. 14. WHAT TO DO? •  Don´t build turbines in cold climate (No option) •  Do not operate from October to May (No option) •  Include ice detection/closing down •  Include active heating equipment •  Include passive deicing equipment •  Put up warning signs COPYRIGHT©PÖYRY PÖYRY POWERPOINT 2010 TEMPLATE 14 17 JANUARY 2012
  15. 15. CONCLUSION •  For service staff recurrence period of 530 years – Not neglectible •  Active heating system solves the problem •  If adding passive de-icing system additional information is needed •  For the public warning signs are sufficient COPYRIGHT©PÖYRY PÖYRY POWERPOINT 2010 TEMPLATE 15 17 JANUARY 2012
  16. 16. THANK YOU! CONTACT: NAME: Bengt Göransson MAIL: bengt.goransson@poyry.com PHONE: 010-4047 COPYRIGHT©PÖYRY PÖYRY POWERPOINT 2010 TEMPLATE 16 17 JANUARY 2012

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