Lightning protection measures for wind turbines are becoming important as the use of wind turbines is increasing rapidly along with its capacity and height. In order to understand the manner of lightning attachment to wind turbine blades, experiments with various types of blade samples were conducted. Experimental studies revealed following issues. Regarding a non-conductive blade sample, the 50% flashover voltage of polluted blade sample was reduced by 10% as compared to a non-pulluted blade sample. Creeping discharges on the polluted blade samples occurred more frequently, and penetrated through the surface, damaging the blade sample. The blade sample with a receptor system showed lower protection performance than the blade covered with a conducting cap.
To clarify the &hara&te~stics of lightning on the coast of the Sea of Japan in winter season, the current w a v~~o r m and the pro~ression of lightning discharge to a high stack were observed. Observation results from 1989 to 1994 show that ; (1) There are two types of lightning ne with large currents and strong luminosity in the ~ightning path, and the other with small currents of long duration and weak luminosity of lightning path. (2) The parameters of ligh~ning currents of the two types of discharges are quite different. (3) There is a quantitative correlation between the change of luminosity in a lightning path and the~i~htning currentwaveform.
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