大型抽水蓄能机组发电电动机定子局部放电的研究

摘要

The cumulative effects of partial discharge occurred in generator stator insulation gap wil eventual y leading to the entire insulation breakdown.So for early detection of partial discharges can effectively grasp the stator insulation condition,according to change of the discharge amount and size can determine the evolution and status of the generator stator insulation.In this paper, analyzed the partial discharge characteristics for large pumped storage power generation motor special operating conditions and operating environment,to provideing reliable data to assess the insulating state of generators.%发生在发电机定子绝缘空隙中的局部放电，由于长时间的累积效应，会使定子绝缘的介电性能逐渐劣化并使局部缺陷扩大，最终导致整个绝缘击穿。因此，对于局部放电的早期监测可以有效地掌握定子的绝缘状况，根据放电量的逐年变化及其大小可以判断发电机定子绝缘的演变及现状。本文针对大型抽水蓄能发电电动机特殊的运行工况和运行环境，分析其局部放电特性，研究其典型的放电谱图所对应的发电机定子的放电位置，根据放电量的大小研究局部放电对主绝缘损伤的严重程度，对发电机的绝缘状态进行评估提供可靠的数据佐证。