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首页> 外文期刊>Electric power systems research >Preventing lightning damage in bearings by using mechanical preloading
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Preventing lightning damage in bearings by using mechanical preloading

机译：通过机械预紧防止轴承遭受雷击损坏

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High positioned systems such as wind turbines or radar system onboard a ship can be easily struck by lightning. The lightning current has to be conducted via defined paths to prevent damage. A key element to protect is the bearing system between the rotating and stationary part. Providing a bypass current path via additional measures such as a slip ring is the conventional way of protecting bearing. The arcing due to high voltage difference between rollers and raceway is however the main cause of damage to the bearing system. It is commonly assumed that, if the wind turbine blades, or the radar, is rotating, the lubrication between the rolling elements and the raceway is a non-electrical conducting hydrodynamic lubrication layer, and thus high voltages can be developed. But if the bearing is sufficiently preloaded it is still providing a conductive path via boundary lubrication. No arcing occurs, and no damage. The concept of pre-loading the bearing system has been evaluated using many experiments on stationary and rotating bearings, and after performing endurance testing. (C) 2016 The Author. Published by Elsevier B.V.
机译：高定位系统，例如船上的风力涡轮机或雷达系统，很容易被雷击。雷电电流必须通过规定的路径传导，以防止损坏。保护的关键要素是旋转和静止部件之间的轴承系统。通过诸如滑环之类的附加措施提供旁路电流路径是保护轴承的常规方法。然而，由于滚子和滚道之间的高电压差而产生的电弧是损坏轴承系统的主要原因。通常假设，如果风力涡轮机叶片或雷达正在旋转，则滚动元件和滚道之间的润滑是非导电的流体动力润滑层，因此可以产生高电压。但是，如果轴承已充分预紧，它仍会通过边界润滑提供导电路径。不会产生电弧，也不会造成损坏。在固定和旋转轴承上进行了许多实验，并在进行了耐久力测试之后，对轴承系统预加载的概念进行了评估。 （C）2016作者。由Elsevier B.V.发布

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