风机叶片雷击附着区域数值仿真及防护

发布时间：2018-06-02 15:54

本文选题：风机叶片 + 雷击　；参考：《高电压技术》2017年08期

【摘要】：风机叶片的雷电防护是风机安全运行的一个重要因素。为了研究风机叶片的雷击附着规律,通过对"云-地"线状雷电先导发展机理的分析,提出了一种基于静电场仿真分析的方法来确定雷击初始附着区域。建立了风机叶片以及下行先导的全尺寸模型,采取有限元法,运用3维电磁场仿真软件分析了雷电先导在风机叶片上的附着特点,优化了接闪器的布置方式,进而分析了叶片接闪器数量、大小对拦截效果的影响,并得出了叶片旋转过程中不同角度的雷击概率特点。研究结果表明:风机叶片叶尖位置雷击概率较高,接闪器布置应尽量靠近叶尖;当单个接闪器横截面积符合IEC 61400-24:2010标准规定的最小值50 mm2时,拦截效果最佳;增大接闪器横截面积及增加接闪器数量对于提高接闪器的拦截效果有限;叶片旋转角α小于45°时,易遭遇雷击,随着叶片旋转角增大,雷击概率逐渐降低,当α等于60°时,雷击概率降至最低。该研究结果可为进一步研究风机遭遇雷电时的电磁辐射特性提供依据。
[Abstract]:The lightning protection of fan blade is an important factor in the safe operation of fan. In order to study the law of lightning stroke attachment of fan blades, a method based on electrostatic field simulation analysis was proposed to determine the initial attachment area of lightning strike through the analysis of the development mechanism of the "cloud-ground" linear lightning guide. The full-scale model of fan blade and downlink forerunner is established. By means of finite element method, the attachment characteristics of lightning guide on fan blade are analyzed by using 3D electromagnetic field simulation software, and the arrangement of lightning connector is optimized. Furthermore, the influence of the number and size of blade flicker on the interception effect is analyzed, and the characteristics of lightning strike probability at different angles during blade rotation are obtained. The results show that the lightning strike probability of the blade tip is high, the arrangement of the flasher should be as close as possible to the tip of the blade, and the interception effect is the best when the cross section area of the single flasher conforms to the minimum 50 mm2 specified in the IEC 61400-24: 2010 standard. Increasing the cross section area and increasing the number of the flasher is limited in improving the intercepting effect, when the blade rotation angle 伪 is less than 45 掳, the lightning strike is easy to be encountered, and the lightning strike probability decreases with the blade rotation angle increasing, when 伪 is equal to 60 掳, the lightning stroke probability decreases gradually with the increase of the blade rotation angle. Lightning strike probability is minimized. The results can provide a basis for further study of electromagnetic radiation characteristics of blower subjected to lightning.
【作者单位】：上海电力学院电气工程学院;上海市防雷中心;南京信息工程大学;
【基金】：上海市气象局面上课题(MS201602) 上海市教育发展基金会和上海市教育委员会“曙光计划”(15SG50)~~
【分类号】：TM315

【相似文献】