Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Keeping turbines and workers safe with lightning diverters and electric meters

1,093 views

Published on

High current is a hazard to the turbine and technicians alike. For the turbine, lightning strikes can damage blades and short out electric equipment when not sufficiently grounded. There are ways to handle the high current in lightning. Inside the nacelle, technicians have to diagnose issues to get troubled turbines back into production as soon as possible. Several new smart electrical meters can assist that work.

Published in: Engineering
  • DOWNLOAD THIS BOOKS INTO AVAILABLE FORMAT (Unlimited) ......................................................................................................................... ......................................................................................................................... Download Full PDF EBOOK here { https://tinyurl.com/yyxo9sk7 } ......................................................................................................................... Download Full EPUB Ebook here { https://tinyurl.com/yyxo9sk7 } ......................................................................................................................... ACCESS WEBSITE for All Ebooks ......................................................................................................................... Download Full PDF EBOOK here { https://tinyurl.com/yyxo9sk7 } ......................................................................................................................... Download EPUB Ebook here { https://tinyurl.com/yyxo9sk7 } ......................................................................................................................... Download doc Ebook here { https://tinyurl.com/yyxo9sk7 } ......................................................................................................................... ......................................................................................................................... ......................................................................................................................... .............. Browse by Genre Available eBooks ......................................................................................................................... Art, Biography, Business, Chick Lit, Children's, Christian, Classics, Comics, Contemporary, Cookbooks, Crime, Ebooks, Fantasy, Fiction, Graphic Novels, Historical Fiction, History, Horror, Humor And Comedy, Manga, Memoir, Music, Mystery, Non Fiction, Paranormal, Philosophy, Poetry, Psychology, Religion, Romance, Science, Science Fiction, Self Help, Suspense, Spirituality, Sports, Thriller, Travel, Young Adult,
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here

Keeping turbines and workers safe with lightning diverters and electric meters

  1. 1. KeepingTurbines and Workers Safe With Lightning Diverters and Electric Meters
  2. 2. Thank You To Our Sponsor
  3. 3. Before We Start q  This webinar will be available at www.windpowerengineering.com & email q  Q&A at the end of the presentation q  Hashtag for this webinar: #WindWebinar
  4. 4. Moderator Presenters Paul Dvorak Windpower Engineering & Development Greg Shine Shine Wire Products Jeffrey Jowett Megger Allen Hall Pinnacle Lightning Protection
  5. 5. Intelligent Safety Under Pressure? Tired? No Time to finish the job?
  6. 6. Safety must be considered from: •  The tester •  The test item
  7. 7. Test Instruments: •  Insulation Tester •  Power Factor •  Winding Resistance
  8. 8. The Tester: Despite high voltage, insulation testers are safe. Current and power are small. To test insulation, you don’t NEED a lot of current. Hence, total current output can be kept small. BUT, be aware of the physical environment.
  9. 9. The Tester: Redundant safety features – IEC61010 arc flash/arc blast protection Safety warnings and indicators Safe design of test leads
  10. 10. The Test Item: De-energized is not “safe”. Standard Safety Practices Lock-out/tag-out Safety enhancements in quality testers: Discharge test item Let operator know
  11. 11. Safety Standards: •  IEEE 62-1995 •  IEEE C57.152 •  IEEE 510-1983 •  IEEE Recommended Practices for Safety in High- Voltage and High-Power Testing
  12. 12. Insulation Test Currents 1 1 Capacitive  Charging   Current Total   Current Conduction  or   Leakage  Current Current  -­‐‑  Microamperes Seconds  (x10) Absorption   Current
  13. 13. Insulation Test Currents Equivalent Circuit of Insulation Leakage Absorption Capacitance
  14. 14. Polarization/Absorption Effects -­‐‑ + -­‐‑ + -­‐‑ + -­‐‑ + + -­‐‑ + + + + -­‐‑ -­‐‑ -­‐‑ -­‐‑ -­‐‑ + + -­‐‑ -­‐‑ + + -­‐‑ -­‐‑ + -­‐‑ + -­‐‑ + + + -­‐‑ -­‐‑ -­‐‑ + Stored Charge Surface Leakage Dipoles
  15. 15. Safety Rating - IEC •  Dictates design considerations - ensure instrument is adequate for hazards of test environment. •  IEC1010 rating consists of two designations; make sure both are specified: - CAT (category). - voltage. •  Determine the highest-rated environment where the instrument will be used. •  Do not buy an instrument without a rating.
  16. 16. High Installation CAT rating •  MIT & S1= CATIV 600V rated •  IEC1010-1:2001 •  Protection against input transients between any terminals •  CATIII 300V •  4kV transient protected •  CATIV 600V •  8kV transient protected
  17. 17. Safety philosophy •  What happens in substations? •  CATIV 600V in a 33kV substation means little….? •  5kV and 10kV insulation testers get used where 1kV testers don’t •  No one can protect against foreseeable misuse here!
  18. 18. Standard Safe Working Practices •  Boots & Gloves •  Barriers •  Beacon
  19. 19. CAUTION: Inductive Source •  Safety grounds •  Voltage indicator •  Discharge stick Make 1st/break last
  20. 20. Power Factor = Redundant Safety •  Hand/foot interlocks •  Dual ground testing •  Circuit breaker protection •  Grounded between tests •  High voltage and open ground indicators •  Arc clearance
  21. 21. Advanced Microprocessor controlled System protects user and instrument in the event of accidental connection to live systems • Contact Detector - Prevents free probe becoming live if other probe contacts live voltage. • Live Circuit Warning - Warns if probes connected to >25V • Test Inhibit - Prevents tests when dangerous external voltages exist • Auto-Discharge -Safely discharges connected circuits after insulation test • Default Voltmeter - Displays external voltages even when switched to non-voltage ranges Beware of lesser Systems! Intelligent Safety System
  22. 22. Contact Detector Concept •  Maintains High Impedance between probes until safe contact is made with the circuit under test. Benefits •  Increased Safety - User will not receive a shock if one probe accidentally contacts a live circuit.
  23. 23. Contact Detector - Additional Benefits No fuse blowing - (Some instruments can blow their internal fuses if voltage present between the points tested): • Difficulty finding replacements and wastes time • Voids calibration seals if instrument has to be opened The contact detector’s high impedance state leaves the fuse intact. Even then… • A replacement is provided in the battery compartment • The instrument case does not need to be opened, (calibration seals remain intact)
  24. 24. 1.  Safety! – the big issue •  High energy environments? •  Concern over receiving shock from instrument •  The danger is actually the after effects Don’t Overlook Leads: Large finger guards to keep fingers back from live parts Side Pivot guards maintain creepage paths Pivot guard maintains clearance Large finger guards to keep fingers back from live parts Side Pivot guards maintain creepage paths Pivot guard maintains clearance Finns increase surface creepage distance Finns Finns increase surface creepage distance Finns
  25. 25. Keeping Turbines and Workers Safe with Lightning Diverters Allen Hall – Pinnacle Lightning Protection, LLC Greg Shine – Shine Wire Products, Inc. WXGUARDWIND.COM
  26. 26. Lightning Damage to Turbine Blades •  Lightning strikes account for roughly 25% of loss claims in US •  Most lightning damage occurs to blades •  Blade claims average 240,000 USD
  27. 27. Typical Blade Designs
  28. 28. Typical Blade Protection
  29. 29. Typical Lightning Strikes •  Most strikes occur within 4 to 5 meters of tip •  Peak currents of 5 to 20 kA •  IEC 61400-24/62305-1 o  200kA o  10 MJ/ohm
  30. 30. Lightning Receptors
  31. 31. Inside the Blade Tip Receptor Metal Mounting BlockDown Conductor
  32. 32. Electrical Breakdown Around Thunderstorm High Voltage Electrical Activity at Mounting Block Damage to Blade Structure
  33. 33. Near Strikes Polytechnic University of Catalonia in Barcelona, Spain •  Electrical activity at nearly every rotation of blade •  Duration o  Few minutes o  Few hours •  Effects seen with storms several kilometers away
  34. 34. Near Strikes •  Most lightning damage to blades occurs over time •  Near strikes break down blade dielectric around receptor •  Eventual lightning attachment results in more damage to blade
  35. 35. Receptor Enhancement •  Need larger receptors on blade exterior to protect structure •  Difficult to achieve on blade in the field Receptor larger than Metal Mounting Block
  36. 36. Segmented Lightning Diverters
  37. 37. Typical Installation Lightning Receptors Internal Down Conductor WXGuard Lightning Diverters
  38. 38. Segmented Diverter Operation Ionized Channel Above Diverter Glass Fiber Reinforced Plastic Blade SurfaceSegmented Lightning Diverter Receptor Down Conductor Metal Segments of Diverter Mounting Block
  39. 39. Size Comparisons Reference IEC 61400-24 Metal Segments 1.5 - 3 mm Diameter 0.2 mm Thick Flexible Substrate 0.25 mm Thick 10 mm Wide 8 mm Diameter Copper Cable 2 mm Thick Copper Tape WXGuard Diverter 25 mm Wide
  40. 40. Repeat Strike Capability High Current Sample 3 Strikes 230 kA 8.5 MJ/ohm Diverter Intact After 3 Strikes
  41. 41. Rain Erosion Standard Segmented Diverter WXGuard Diverter
  42. 42. Segmented Diverter Benefits •  Improve protection to existing blades •  Lightweight and flexible •  Installed with standard epoxy or 3M VHB Tape •  Repeat strike capable •  Rain erosion resistant
  43. 43. Thank You •  Visit WXGUARDWIND.COM •  Free White Papers •  Free Test Reports •  Free Installation Guide
  44. 44. Questions? Paul Dvorak Windpower Engineering & Development pdvorak@wtwhmedia.com Twitter: @windpower_eng Greg Shine Shine Wire Products gshine@shinewire.com Allen Hall Pinnacle Lighting Protection Allen_l_hall@pinnaclelightning.com Jeffrey Jowett Megger Jeff.jowett@megger.com
  45. 45. Thank You q  This webinar will be available at www.windpowerengineering.com & email q  Tweet with hashtag #WindWebinar q  Connect with Windpower Engineering & Development q  Discuss this on the EngineeringExchange.com

×