The unit of a power plant is 2 * 300MW. Once, speed had to zero and barring started normal after the shutdown, then the unit speed turn to more than 1000 rpm automatically. Through the analysis of professional and technical personnel to find the reason, we found out the reason of the event and had carried on the thorough treatment. And prevention and control measures are put forward, so as to ensure there are no similar problems, to ensure that the equipment and personal safety. In this article, through the analysis and processing of actual examples, we expect professional personnel to pay high attention to the quality of lubricating oil system and fire resistant oils and the operational reliability of electromagnetic valve during operation of the steam turbine to ensure the safe operation of the equipment.%某电厂为2×300MW机组，在某次停机后转速已到0，盘车启动正常，但随后机组又发生自动升速至1000多转。经专业技术人员对事件原因的分析，查明事件原因并进行彻底处理，同时提出了预控措施，以防止类似问题再次发生。文中通过该事件的交流，期望专业人员高度重视电厂汽轮机运行时的润滑油系统油质、抗燃油油质及各电磁阀运行可靠性，及时做好维护与预控工作，以确保设备安全运行。
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