SUMMARYThe development of a wind turbine generator system in Japan is regarded as a promising source of clean energy, and its popularization is rapidly increasing. In Japan, there are many wind turbine generator systems installed on the Sea of Japan coast, with large wind capacity. However, since the Sea of Japan coast is a region with abundant winter lightning, a phenomenon peculiar to Japan, the wind turbine generator systems are subject to damage from winter lightning. Thus, it is important to observe the lightning currents striking wind turbine generator systems in order to provide lightning protection. The authors therefore installed currents sensors (Rogowski coils) on wind turbine generators installed in Hokkaido and Kagoshima Prefectures, and performed waveform observation of lightning stroke current in the winter of 2002 and the summer of 2003. These observations yielded a few current waveforms for lightning striking wind turbine generators. This paper describes the investigation and presents the observation results.
Mechanism of Lightning Damage on Low-voltage Distribution Equipment due to Arc dynamic currentTakahiro Otsuka,member (Toko Electric co.)Masanori Matsuoka,member (Toko Electric co.)Shigeru Uchiyama,member (TEPCO)Ichiro Sumitani,member (TEPCO)The lightning damage on low-voltage power distribution systems is almost burning of low-voltage distribution equipment due to flashover and arc dynamic current.The lightning overvoltage causes flashover of low-voltage distribution equipments. After that, the flashover causes burning, because of impressing the commercial frequency voltage.Two kinds of experiments were conducted by the authors. The first was using real scale low-voltage distribution line model.The second was using a low-voltage distribution equipment. According to the first experiment, a lightning overvoltage causes burning at an equipment or two equipments on a low-voltage power distribution system. In the second experiment,the authors suggested that flashover current due to lightning overvoltage become 0 ampere at once when flashover current switches to arc dynamic current.
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