Abstract
Wind power generators are widely used as one of renewable energy. A Blade of a wind power generator may be damaged by a lightning strike and it is thought that a damage of the blade is caused by expansion of the air inside the blade after a lightning penetrate the insulating material of the blade. In this paper, in order to investigate the phenomenon that a discharge such as lightning penetrate an insulator in its path, we photographed the propagation of the air discharge. This discharge propagated through the multiple barriers of papers and polyethylene terephthalate films in the discharge path. As a result, firstly, the statistical time lag shortened with the existence of barriers between the electrodes, and the formation time lag became longer with the barriers. It is considered that the diffusion of space charge was suppressed by the barriers. Secondly, assuming that a secondary electron emission occurs from the insulator due to the high electric field at the tip of the leader discharge, it might be explained that the discharge time lag was shorter than that without barriers because electrons were supplied by this emission.
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Acknowledgments
This work was partly supported by Kumamoto University IPPS collaborative research, by JSPS KAKENHI Grant Number 19K14973 and by the Institute of Electrical Engineers of Japan for the IEEJ International Conference Travel Grant.
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Araoka, N. et al. (2020). Observation of Propagation Phenomenon of Air Discharge Penetrating Through Insulator Barrier in Discharge Path. In: Németh, B. (eds) Proceedings of the 21st International Symposium on High Voltage Engineering. ISH 2019. Lecture Notes in Electrical Engineering, vol 599. Springer, Cham. https://doi.org/10.1007/978-3-030-31680-8_42
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DOI: https://doi.org/10.1007/978-3-030-31680-8_42
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