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<p>The economic efficiency of wind turbines is considerably affected by the occurrence of premature bearing failures in gearboxes. Due to their proximity to the generator, gearbox bearings experience additional electrical stress, leading to voltage buildup across the bearing. When this voltage exceeds a&#xa0;certain threshold (breakdown voltage), it discharges as an arc. It is well established that electrical discharge across a&#xa0;bearing can induce surface- and structural-damage to the bearing material. The effect of particles on the electrical properties of oil, and consequently on potential current conduction, is well documented in other technical fields. The existing design standards for wind turbine gearboxes and bearings only consider the mechanical effects of particles. Therefore, only particles with a&#xa0;diameter ≥ 6 µm are considered. This study experimentally investigates the influence of particles &lt; 6 µm on the breakdown voltage and frequency in electrically loaded cylindrical roller bearings. These particles, which are not considered in current design standards for wind turbine gearboxes, constitute the majority of contaminants. The results show that higher particle concentrations lead to a&#xa0;reduction in breakdown voltage. This effect is also evident within the typical particle contamination levels found in wind turbine gearboxes. Additionally, higher particle concentrations correlate with increased breakdown frequency and reduced energy per breakdown, suggesting a&#xa0;possible shift from surface- to structure-induced damage mechanisms.</p>

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Influence of lubricant particle contamination on discharge events in electrical loaded radial cylindrical roller bearings

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月19日

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  • Jörn Christian Harling,
  • Peter Rößler,
  • Georg Jacobs,
  • Benjamin Lehmann

摘要

The economic efficiency of wind turbines is considerably affected by the occurrence of premature bearing failures in gearboxes. Due to their proximity to the generator, gearbox bearings experience additional electrical stress, leading to voltage buildup across the bearing. When this voltage exceeds a certain threshold (breakdown voltage), it discharges as an arc. It is well established that electrical discharge across a bearing can induce surface- and structural-damage to the bearing material. The effect of particles on the electrical properties of oil, and consequently on potential current conduction, is well documented in other technical fields. The existing design standards for wind turbine gearboxes and bearings only consider the mechanical effects of particles. Therefore, only particles with a diameter ≥ 6 µm are considered. This study experimentally investigates the influence of particles < 6 µm on the breakdown voltage and frequency in electrically loaded cylindrical roller bearings. These particles, which are not considered in current design standards for wind turbine gearboxes, constitute the majority of contaminants. The results show that higher particle concentrations lead to a reduction in breakdown voltage. This effect is also evident within the typical particle contamination levels found in wind turbine gearboxes. Additionally, higher particle concentrations correlate with increased breakdown frequency and reduced energy per breakdown, suggesting a possible shift from surface- to structure-induced damage mechanisms.