660MW机组发电机机端电容器故障分析及处理

Analysis and Treatment of Capacitance Fault at Generator End of 660 MW Unit

介绍某电厂2号机组发电机机端电容器内部结构变化后造成发电机定子接地保护跳闸的事件。通过对故障波形的研究以及直流绝缘特性、空载特性等试验数据的分析,判断电容器制造工艺不良是造成此次故障的主要原因,并提出相应的防范措施和建议。

This paper introduces the event of generator stator grounding protection tripping caused by the internal structure change of generator terminal capacitor of unit 2 in a power plant.Through the study of fault waveform and the analysis of DC insulation characteristics and no-load characteristics test data,it is determined that poor capacitor manufacturing is the main cause of the fault,and the corresponding preventive measures and suggestions are put forward.