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Yu WANG (王羽), Lu QU (屈路), Tianjun SI (姒天军), Yang NI (倪阳), Jianwei XU (徐建伟), Xishan WEN (文习山). Experimental study of rotating wind turbine breakdown characteristics in large scale air gaps[J]. Plasma Science and Technology, 2017, 19(6): 64016-064016. DOI: 10.1088/2058-6272/aa6743
Citation: Yu WANG (王羽), Lu QU (屈路), Tianjun SI (姒天军), Yang NI (倪阳), Jianwei XU (徐建伟), Xishan WEN (文习山). Experimental study of rotating wind turbine breakdown characteristics in large scale air gaps[J]. Plasma Science and Technology, 2017, 19(6): 64016-064016. DOI: 10.1088/2058-6272/aa6743

Experimental study of rotating wind turbine breakdown characteristics in large scale air gaps

Funds: This work is supported by the China State Grid Corp headquarters project in 2015 (SGTYHT/14-JS-188).
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  • When a wind turbine is struck by lightning, its blades are usually rotating. The effect of blade rotation on a turbine’s ability to trigger a lightning strike is unclear. Therefore, an arching electrode was used in a wind turbine lightning discharge test to investigate the difference in lightning triggering ability when blades are rotating and stationary. A negative polarity switching waveform of 250/2500 μs was applied to the arching electrode and the up-and-down method was used to calculate the 50% discharge voltage. Lightning discharge tests of a 1:30 scale wind turbine model with 2, 4, and 6 m air gaps were performed and the discharge process was observed. The experimental results demonstrated that when a 2 m air gap was used, the breakdown voltage increased as the blade speed was increased, but when the gap length was 4 m or longer, the trend was reversed and the breakdown voltage decreased. The analysis revealed that the rotation of the blades changes the charge distribution in the blade-tip region, promotes upward leader development on the blade tip, and decreases the breakdown voltage. Thus, the blade rotation of a wind turbine increases its ability to trigger lightning strikes.
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