一起因轉子繞組形變導致發電機振動大的案例分析
楊玉磊
（中國大唐集團科學技術研究院有限公司華東電力試驗研究院，安徽 合肥 230088）
摘 要：隨著大容量高參數發電機的普遍應用，發電機兩端振動隨負荷變化異常增大的案例也越來越多。介紹了一臺1 000 MW汽輪發電機自投運2 年后10 瓦振動在高負荷階段異常持續增大的分析和處理過程。給出了振動異常特征，通過轉子返廠解體檢修，最終確認護環下外層全尺寸絕緣瓦堆起引起轉子端部繞組形變和通風孔部分堵塞是引起發電機振動異常變化的直接原因，并給出了解決措施，以防同類型故障再次發生。
關鍵詞：發電機；轉子繞組；振動大；熱不平衡；繞組形變
中圖分類號：TM311 文獻標識碼：B 文章編號：1007-3175(2021)03-0058-04
A Case Study of Generator Vibration Increases Caused by Rotor Winding Deformation
YANG Yu-lei
（China Datang Corporation Science and Technology Research Institute Co., Ltd East China Electric
Power Test & Research Institute, Hefei 230088, China）
Abstract: With the widespread application of large-capacity and high-parameter generators in the field of coal-fired power generation, there are more and more cases in which the vibration at both ends of the generator increases abnormally with load changes. This paper introduces in detail the analysis and treatment process of the abnormal continuous increase of the 10-watt vibration of a 1 000 MW turbo-generator after it has been put into operation for two years. After the rotor returned to the factory for disassembly and overhaul, it was finally confirmed that the stacking of the full-size insulating tiles under the guard ring caused partial blockage of the winding deformation of the rotor end and the ventilation holes were the direct causes of abnormal vibration of the generator, and provided solutions to prevent the same type of failure happening again.
Key words: generator; rotor winding; vibration increases; thermal unbalance; winding deformation
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