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.

中文翻译：

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绝缘膜的表面电阻率对负雷电冲击放电渗透现象的影响

即使雷电击中叶片，也需要一种防止雷击损坏风力发电机的方法。在我们的实验中，尽管放电总是会穿透未涂覆的PET膜，但进行到该膜的放电很难穿透一侧具有导电涂层的低表面电阻率的聚对苯二甲酸乙二醇酯（PET）膜。当将膜的涂覆表面指向高压杆电极侧或接地板电极侧时，可以确认该结果。还可以确认，从高速棒电极侧产生的负引导的进行受到高速照相机拍摄的胶卷的阻碍。由表面电阻和膜与板状电极之间的电容的乘积计算时间常数。因此，