风机塔筒的雷电电磁场屏蔽效能分析  

Analysis of Lightning Electromagnetic Field Shielding Effectiveness of Wind Turbine Towers

作　　者：张玉凤[1] 张鹏[2] 李帅[2] 

机构地区：[1]江苏建筑职业技术学院,江苏徐州221116 [2]中国农业大学信息与电气工程学院,北京100083

出　　处：《电瓷避雷器》2016年第4期42-46,50,共6页Insulators and Surge Arresters

基　　金：国家自然科学基金资助项目(编号:50077024)

摘　　要：风机附近发生雷电放电时,产生的雷电电磁场会对塔筒内部线缆和电子器件产生干扰甚至产生破坏。本文利用Heidler电流函数模型和TL回击通道传输模型,计算雷电通道周围的电磁场分布。将风机塔筒等效为圆筒形屏蔽体,在材质厚度确定的情况下计算塔筒的屏蔽系数。分析结果表明:雷电电磁场强度随雷击点距离的增加而减小。塔筒厚度越大,屏蔽效果越好。风机塔筒对100 k Hz以下的低频段能量具有明显的衰减作用。对于实际塔筒结构存在的孔缝造成的电磁泄漏,需要采取相应防护措施,增强塔筒的屏蔽效果。When lightning occurred near the wind turbine, lightning electromagnetic field （LEMP） will interfere with cables and electronic devices in the tower. Heidler functions of lightning current and TL return stroke model are used to calculate the distribution of electromagnetic field of the discharge channel model. Equaling the wind turbine tower to the cylindrical screen, shielding effectiveness of the tower is analyzed. Results show that, the intensity of lightning electromagnetic field decreases with the distance from the discharge channel; shielding effect increases with the thickness of the tower; the tower can weaken the energy of low frequency obviously such as lower than 100 kHz. Corresponding protection measures must be taken to cope with electromagnetic leakage through apertures in the actual tower.

关 键 词：风力发电机 塔筒 雷电电磁场 屏蔽效能 

分 类 号：TM315[电气工程—电机]