发电机集电环及碳刷烧损事故原因分析及现场处理

Cause Analysis of Generator Collector Ring and Carbon Brush Burning

内蒙古某电厂330 MW汽轮发电机发生烧损事故,造成发电机集电环、碳刷烧损,大轴损伤。分析事故原因是由于绝缘套筒存在质量缺陷,脱开的玻璃丝布被高速转动的转子风扇打碎后带入滑环与碳刷间,最终引发了事故。经过现场修复发电机大轴、集电环、碳刷后,发电机运行至今状况良好。同时建议有同类型发电机的发电厂,应加固发电机集电环绝缘套筒的外露部分,防止运行中绝缘套筒的玻璃丝布甩出,造成发电机事故。

One 330 MW steam turbine generator of a power plant was damaged in Inner Mongolia, not only caused generator slip ring and carbon brush burning, but also the generator shaft damaged. Analysis the cause of the failure was due to the insulating sleeve quality defects, tripping out of glass cloth by high speed rotating rotor fan was broken and went into the slip ring and carbon brush, eventually led to the fault. Through the scene processing, repaired the generator shaft, collector ring and carbon brush. At present, the generator is running in good condition. Through the fault handling, it is suggested that there are power plants of the same kind of generator, reinforce the generator slip ring insulation sleeve.