Large Current Lightning Mimic Test for FRP Blades of Wind Turbine Generators

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  • Hanai Masahiro
    Power & Industrial Systems Research & Development Center, Toshiba Corporation Power Systems Company
  • Ikeda Hisatoshi
    Hamakawasaki Works, Toshiba Corporation Power Systems Company
  • Nakadate Masumi
    Power & Industrial Systems Research & Development Center, Toshiba Corporation Power Systems Company
  • Sakamoto Haruo
    Department of Intelligent Mechanical System Engineering, Kochi University of Technology

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  • 風力発電機ＦＲＰブレードの大電流雷模擬試験
  • フウリョク ハツデンキ FRP ブレード ノ ダイデンリュウライ モギ シケン

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Abstract

In Japan, lightning damage to FRP blades of wind turbine generators has been increasing in parallel with the recent increase in the installation of wind turbine generators. Therefore, we established a test method, while clarifying the destructive climate of lightning, and examined a method of preventing destruction.<br>A high-voltage test clearly showed that lightning easily penetrates FRP that is not processed to be conductive. Moreover, after developing a test method, an examination with a large current successfully reproduced blade damage, and revealed the failure mechanism, which explains breakdowns of actual machines. If lightning penetrates a FRP blade, the air temperature inside the blade rises. As a result, pressure increases and the blade is damaged. Moreover, the breakdown of positive polarity (winter) lightning can be examined with a large current that is generated by a short circuit generator.

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