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Influence of surface resistivity of insulation films on penetration phenomenon by negative lightning impulse discharge
Author(s) -
Mizusaki Masayuki,
Araoka Nobutaka,
Takamura Norimitsu,
Sasaki Yuki,
Ryu Terumasa,
Matsuda Mikiya,
Namihira Takao,
Hanai Masahiro
Publication year - 2021
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.23322
Subject(s) - materials science , electrode , impulse (physics) , composite material , polyethylene terephthalate , electrical resistivity and conductivity , penetration (warfare) , capacitance , coating , voltage , electrical conductor , electrical engineering , chemistry , physics , quantum mechanics , operations research , engineering
A method is needed to prevent damage of wind power generators from lightning strikes even if lightning strikes the blades. In our experiment, the discharge progressing to the film was hard to penetrate the low surface resistivity polyethylene terephthalate (PET) films with conductive coating on one side, although the discharge always penetrated the uncoated PET film. This result was confirmed when the coated surface of the film was directed to either the high voltage rod electrode side or the ground plate electrode side. It was also confirmed that the progress of negative leader generated from the high voltage rod electrode side was hindered by the film from the photograph with the high speed camera. The time constant was calculated from the product of the surface resistance and the capacitance between the film and the plate electrode. As a result, it was suggested that the propagation of electric potential might be fast because time constant is smaller in the case of the low surface resistivity PET films.