冲击电压下背面电极对玻纤/环氧树脂蒙皮沿面放电特性的影响研究  

Study on Influence of Backside Electrode on Surface Discharge Characteristics of Glass Fiber/Epoxy Resin Skin Under Impulse Voltage

作　　者：赵玉顺[1] 刘志轶 侯天奇 傅毓斐 ZHAO Yushun;LIU Zhiyi;HOU Tianqi;FU Yufei(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,合肥230009

出　　处：《高压电器》2025年第3期128-137,共10页High Voltage Apparatus

基　　金：国家自然科学基金资助项目(52177018)。

摘　　要：雷击风机叶片将造成严重事故,威胁风电机组安全运行。文中提出一种新型雷电防护方法,通过背面电极将雷击在叶片表面产生的沿面放电导向接闪器。该方法的防雷成功率与叶片的沿面放电特性有关,研究背面电极对风机叶片沿面放电特性的影响,对于提高新型雷电防护方法的效能具有重要意义。采用玻纤/环氧树脂蒙皮模拟实际风机叶片结构,改变背面电极的尺寸和位置,观察不同情况下蒙皮的沿面放电形貌。结果表明,背面电极将改变蒙皮的沿面放电形貌,增加沿面放电长度;背面电极的宽度越小、长度越长,沿面放电的长度越长;当背面电极距离雷击附着点较近时,沿面放电仍然能够增长,当背面电极距离雷击附着点较远时,沿面放电不再增长。分析认为,背面电极影响了蒙皮表面的电场分布,增强了二次电子发射过程,从而导致沿面放电长度增加。The lightning strike to the turbine blade will cause serious accidents and threaten safe operation of wind turbine.In this paper,a kind of novel lightning protection method is proposed and the surface discharge along blade due to lightning strike is directed to the receptor through the backside electrode.The lightning protection successful rate of the method is related to the surface discharge characteristics of the blade,therefore it is significant for improving effectiveness of the novel lightning protection method to study the influence of backside electrode on the surface discharge characteristics of wind turbine blade under lightning strike.Glass fiber/epoxy resin skin is adopted to simulate the actual structure of wind turbine blade,and the surface discharge morphology of the skin is observed by changing the size and position of backside electrode.The results show that the backside electrode will change the surface discharge morphology of the skin and increase the surface discharge length.The smaller the width and the longer the length of the backside electrode,the longer the length of the surface discharge.When the backside electrode is close to the lightning attachment point,and surface discharge can still be increased.While,when the backside electrode is far away from the lightning attachment point,the surface discharge is not increased any longer.The analysis indicates that the backside electrode influences the electric field distribution of the skin surface,enhances the process of secondary electron emission,thus leading to the increase of surface discharge length.

关 键 词：冲击电压 风机叶片 背面电极 沿面放电 

分 类 号：TM315[电气工程—电机] TM863