风电机组箱式变压器的雷电防护分析

Analysis of Lightning Protection for Box Transformer of Wind Turbines

风力发电机组属于高耸构筑物，由于普遍位于沿海、高山地区，机组遭受雷击现象也十分普遍。因风机本身保护一般比较完善，但由于雷电流引出导致箱式变压器被击穿的现象时有发生，存在着重大安全隐患，同时会造成风机停机，影响风电场效益，尤其是环境保护要求较高地区，采用全场电缆，多采用串联方式，当箱式变压器遭受雷击损毁时，易造成多台风机同时停机。本文通过对利用仿真技术，将雷电流通过PEN线流人箱式变压器对风机和箱式变压器两侧分别加装浪涌保护器（SPD）和避雷器进行分析和对比雷电流对箱式变压器的影响，提出解决方案。

The wind turbine is belong to towering structures so as to easy be struck by lightning in the coastal and mountainous areas.Even though WT was well protected by itself but major security risks was came from box- transformer breakdown caused by lighting, when these occurred, It will lead to WT stop working and lower the efficiency and benefit of the Wind Farms, particularly, in some high protection area, to use of whole cable in Series will result in much more WTs stop working at the same time when Box Transformer was damaged by lighting. This paper has provided the solution though simulation technology for analysis of the lightning current flows pass though PEN line into surge protector （SPD） AND arrester between WT and box transformer as well as impaction comparison of the box-transformers.