风力发电机主轴承的雷电防护分析  

Lightning Protection Analysis of Main Shaft Bearings in the Wind Turbine

作　　者：梁明亮[1] 董黎生[1] 

机构地区：[1]郑州铁路职业技术学院,郑州451460

出　　处：《电瓷避雷器》2018年第1期15-19,共5页Insulators and Surge Arresters

基　　金：河南省高校青年骨干教师资助计划(编号:2014GGJS-167)

摘　　要：风力发电机遭受雷击后,会有部分雷电流通过主轴承泄散,可能会对轴承和发电机造成损害,因此做好主轴承的防雷保护至关重要。利用EMTP软件搭建风机叶片、塔筒、接地体和轴承模型,讨论单独采用火花间隙和增加滑动接触器对于主轴承防护的效果,分析雷电流幅值、波头时间和接地电阻对于二者分流比的影响。分析结果表明:单独采用火花间隙防护时,流经轴承的雷电流幅值仍然较高;增加滑动接触器后几乎全部雷电流经由火花间隙和滑动接触器泄散。火花间隙和滑动接触器的分流比随着雷电流幅值的增加而增加,随着波头时间的增加而减小。风机接地电阻对分流比也有一定影响,分流比随着接地电阻的增加而降低。安装火花间隙和滑动接触器后能够提供良好的旁路分流路径,有效保护风机主轴承和发电机。Lightning current pulse will pass through main shaft bearings when the wind turbine is struck by lightning, which may cause damage to main shaft beatings and the generator. A complete model of the wind turbine contains the blade, tower, grounding system and the main shaft is established in ATP-EMTP to analyze protective effects of the spark gap and sliding contacts in lightning current shunt- ing. The influences of lightning current, wave front time and grounding resistance are discussed. Results show that： there is still a significant amount of current flowing through the bearings through installing the spark gap; few current flows through the beatings when gap and sliding contacts increases with the increasing the increasing of wave front time. Grounding resistance stalling the spark gap and sliding contacts can provide effectively protect the main beating and generator. sliding contacts are added. Split ratio of the spark of lightning current amplitude and decreases with also has some certain effect on the split ratio. In- a redundant path for the lightning current, which

关 键 词：风力发电机 雷电防护 主轴承 分流 

分 类 号：TM315[电气工程—电机]