Abstract
The causes of lightning damages of wind turbine blades were clarified through lightning observation and experiments using a high-voltage impulse generator. Upward leaders and large energy of winter lightning, which is frequent along the coast of the sea of Japan, play an important role upon lightning damages of wind turbine blades. Lightning discharges may penetrate into the cavity of a blade without lightning receptors, resulting in serious damages, such as an destruction and falling of a blade. Although lightning receptors are totally useful for lightning protection of wind turbine blades, they are not perfect.
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